EWG's drinking water quality report showsresults of tests conducted by the water utility and provided to the Environmental Working Group by the Texas Commission on Environmental Quality, as well asinformation from the U.S. EPA Enforcement and Compliance History database (ECHO). For the latest quarter assessed by the U.S. EPA (January 2021 - March 2021), tap water provided by this water utility was in compliance with federal health-based drinking water standards.
Utility Details
- Lewisville, Texas
- Serves: 104,780
- Data available: 2014-2019
- Source: Surface water
Contaminants Detected
14
EXCEED
EWG HEALTH
GUIDELINES
34 Total Contaminants
- Legal does not necessarily equal safe. Getting a passing grade from the federal government does not mean the water meets the latest health guidelines.
- Legal limits for contaminants in tap water have not been updated in almost 20 years.
- The best way to ensure clean tap water is to keep pollution out of source water in the first place.
Looking for a countertop water filter?
Find out which filters earned EWG's recommendation
Contaminants Detected
Arsenic
Potential Effect: cancer181x EWG'S HEALTH GUIDELINE
THIS UTILITY0.723 ppb
EWG HEALTH GUIDELINE0.004 ppb
LEGAL LIMIT10 ppb
X
Arsenic
Arsenic is a potent carcinogen and common contaminant in drinking water. Arsenic causes thousands of cases of cancer each year in the U.S. Click here to read more about arsenic.
Arsenic was found at 181 times above EWG's Health Guideline.
EWG Health Guideline
0.004 ppb or less
This Utility
0.723 ppb
Legal Limit
10 ppb
National Average
0.647 ppb
State Average
1.03 ppb
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2017-2019.
ppb = parts per billion
Health Risks
The EWG Health Guideline of 0.004 ppb for arsenic was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.
Pollution Sources
Agriculture
Industry
Naturally Occurring
Filtering Options
Reverse Osmosis
Ion Exchange
Bromochloroacetic acid
Potential Effect: 208x EWG'S HEALTH GUIDELINE
THIS UTILITY4.17 ppb
EWG HEALTH GUIDELINE0.02 ppb
NO LEGAL LIMIT
X
Bromochloroacetic acid
Bromochloroacetic acid is formed when chlorine or other disinfectants are used to treat drinking water. Bromochloroacetic acid and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy.
Bromochloroacetic acid was found at 208 times above EWG's Health Guideline.
EWG Health Guideline
0.02 ppb or less
This Utility
4.17 ppb
National Average
3.16 ppb
State Average
4.18 ppb
NO LEGAL LIMIT
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2017-2019.
ppb = parts per billion
Health Risks
The EWG Health Guideline of 0.02 ppb for bromochloroacetic acid was defined in a peer-reviewed scientific study by EWG and represents a on-in-a-million lifetime cancer risk level. This health guideline protects against cancer.
Pollution Sources
Treatment Byproducts
Filtering Options
Activated Carbon
Reverse Osmosis
Bromodichloromethane
Potential Effect: cancer87x EWG'S HEALTH GUIDELINE
THIS UTILITY5.23 ppb
EWG HEALTH GUIDELINE0.06 ppb
NO LEGAL LIMIT
X
Bromodichloromethane
Bromodichloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromodichloromethane and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.
Bromodichloromethane was found at 87 times above EWG's Health Guideline.
EWG Health Guideline
0.06 ppb or less
This Utility
5.23 ppb
National Average
5.79 ppb
State Average
7.02 ppb
NO LEGAL LIMIT
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2017-2019.
ppb = parts per billion
Health Risks
The EWG Health Guideline of 0.06 ppb for bromodichloromethane was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.
Pollution Sources
Treatment Byproducts
Filtering Options
Activated Carbon
Reverse Osmosis
Chloroform
Potential Effect: cancer23x EWG'S HEALTH GUIDELINE
THIS UTILITY9.37 ppb
EWG HEALTH GUIDELINE0.4 ppb
NO LEGAL LIMIT
X
Chloroform
Chloroform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Chloroform and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy.
Chloroform was found at 23 times above EWG's Health Guideline.
EWG Health Guideline
0.4 ppb or less
This Utility
9.37 ppb
National Average
15.5 ppb
State Average
8.88 ppb
NO LEGAL LIMIT
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2017-2019.
ppb = parts per billion
Health Risks
The EWG Health Guideline of 0.4 ppb for chloroform was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.
Pollution Sources
Treatment Byproducts
Filtering Options
Activated Carbon
Reverse Osmosis
Chromium (hexavalent)
Potential Effect: cancer9.7x EWG'S HEALTH GUIDELINE
THIS UTILITY0.195 ppb
EWG HEALTH GUIDELINE0.02 ppb
NO LEGAL LIMIT
X
Chromium (hexavalent)
Chromium (hexavalent) is a carcinogen that commonly contaminates American drinking water. Chromium (hexavalent) in drinking water may be due to industrial pollution or natural occurrences in mineral deposits and groundwater. Read more about chromium (hexavalent).
Chromium (hexavalent) was found at 9.7 times above EWG's Health Guideline.
EWG Health Guideline
0.02 ppb or less
This Utility
0.195 ppb
National Average
0.484 ppb
State Average
0.321 ppb
NO LEGAL LIMIT
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2013-2019.
ppb = parts per billion
Health Risks
The EWG Health Guideline of 0.02 ppb for chromium (hexavalent) was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.
Pollution Sources
Industry
Naturally Occurring
Filtering Options
Reverse Osmosis
Ion Exchange
Dibromoacetic acid
Potential Effect: 15x EWG'S HEALTH GUIDELINE
THIS UTILITY0.593 ppb
EWG HEALTH GUIDELINE0.04 ppb
NO LEGAL LIMIT
X
Dibromoacetic acid
Dibromoacetic acid, one of the group of five haloacetic acids regulated by federal standards, is formed when chlorine or other disinfectants are used to treat drinking water. Haloacetic acids and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.
Dibromoacetic acid was found at 15 times above EWG's Health Guideline.
EWG Health Guideline
0.04 ppb or less
This Utility
0.593 ppb
National Average
1.1 ppb
State Average
2.62 ppb
NO LEGAL LIMIT
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2017-2019.
ppb = parts per billion
Health Risks
The EWG Health Guideline of 0.04 ppb for dibromoacetic acid was defined in a peer-reviewed scientific study by EWG and represents a on-in-a-million lifetime cancer risk level. This health guideline protects against cancer.
Pollution Sources
Treatment Byproducts
Filtering Options
Activated Carbon
Reverse Osmosis
Dibromochloromethane
Potential Effect: cancer20x EWG'S HEALTH GUIDELINE
THIS UTILITY2.04 ppb
EWG HEALTH GUIDELINE0.1 ppb
NO LEGAL LIMIT
X
Dibromochloromethane
Dibromochloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Dibromochloromethane and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.
Dibromochloromethane was found at 20 times above EWG's Health Guideline.
EWG Health Guideline
0.1 ppb or less
This Utility
2.04 ppb
National Average
3.29 ppb
State Average
5.82 ppb
NO LEGAL LIMIT
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2017-2019.
ppb = parts per billion
Health Risks
The EWG Health Guideline of 0.1 ppb for dibromochloromethane was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.
Pollution Sources
Treatment Byproducts
Filtering Options
Activated Carbon
Reverse Osmosis
Dichloroacetic acid
Potential Effect: cancer59x EWG'S HEALTH GUIDELINE
THIS UTILITY11.9 ppb
EWG HEALTH GUIDELINE0.2 ppb
NO LEGAL LIMIT
X
Dichloroacetic acid
Dichloroacetic acid, one of the group of five haloacetic acids regulated by federal standards, is formed when chlorine or other disinfectants are used to treat drinking water. Haloacetic acids and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.
Dichloroacetic acid was found at 59 times above EWG's Health Guideline.
EWG Health Guideline
0.2 ppb or less
This Utility
11.9 ppb
National Average
7.97 ppb
State Average
7.95 ppb
NO LEGAL LIMIT
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2017-2019.
ppb = parts per billion
Health Risks
The EWG Health Guideline of 0.2 ppb for dichloroacetic acid was proposed in 2020 by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk.a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.
Pollution Sources
Treatment Byproducts
Filtering Options
Activated Carbon
Reverse Osmosis
Haloacetic acids (HAA5)†
Potential Effect: cancer175x EWG'S HEALTH GUIDELINE
THIS UTILITY17.5 ppb
EWG HEALTH GUIDELINE0.1 ppb
LEGAL LIMIT60 ppb
X
Haloacetic acids (HAA5)
Haloacetic acids are formed when disinfectants such as chlorine are added to tap water. The group of five haloacetic acids regulated by federal standards includes monochloroacetic acid, dichloroacetic acid, trichloroacetic acid, monobromoacetic acid and dibromoacetic acid.
Haloacetic acids (HAA5) was found at 175 times above EWG's Health Guideline.
EWG Health Guideline
0.1 ppb or less
This Utility
17.5 ppb
Legal Limit
60 ppb
National Average
17.1 ppb
State Average
14.4 ppb
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2017-2019.
ppb = parts per billion
Health Risks
The EWG Health Guideline of 0.1 ppb for the group of five haloacetic acids, or HAA5, was defined in a peer-reviewed scientific study by EWG and represents a one-in-a-million lifetime cancer risk level. This health guideline protects against cancer.
Pollution Sources
Treatment Byproducts
Filtering Options
Activated Carbon
Reverse Osmosis
Haloacetic acids (HAA9)†
Potential Effect: cancer508x EWG'S HEALTH GUIDELINE
THIS UTILITY30.5 ppb
EWG HEALTH GUIDELINE0.06 ppb
NO LEGAL LIMIT
X
Haloacetic acids (HAA9)
Haloacetic acids are formed when disinfectants such as chlorine are added to tap water. The group of nine haloacetic acids includes monochloroacetic acid, dichloroacetic acid, trichloroacetic acid, monobromoacetic acid and dibromoacetic acid, which are regulated as a group by the federal government (HAA5); and bromochloroacetic acid, bromodichloroacetic acid, chlorodibromoacetic acid, and tribromoacetic acid.
Haloacetic acids (HAA9) was found at 508 times above EWG's Health Guideline.
EWG Health Guideline
0.06 ppb or less
This Utility
30.5 ppb
National Average
23.7 ppb
State Average
23.9 ppb
NO LEGAL LIMIT
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2017-2021.
ppb = parts per billion
Health Risks
The EWG Health Guideline of 0.06 ppb for the group of nine haloacetic acids, or HAA9, was defined in a peer-reviewed scientific study by EWG and represents a one-in-a-million lifetime cancer risk level as . This health guideline protects against cancer.
Pollution Sources
Treatment Byproducts
Filtering Options
Activated Carbon
Reverse Osmosis
Nitrate
Potential Effect: cancer6.7x EWG'S HEALTH GUIDELINE
THIS UTILITY0.933 ppm
EWG HEALTH GUIDELINE0.14 ppm
LEGAL LIMIT10 ppm
X
Nitrate
Nitrate, a fertilizer chemical, frequently contaminates drinking water due to agricultural and urban runoff, and discharges from municipal wastewater treatment plants and septic tanks. Excessive nitrate in water can cause oxygen deprivation in infants and increase the risk of cancer. Click here to read more about nitrate.
Nitrate was found at 6.7 times above EWG's Health Guideline.
EWG Health Guideline
0.14 ppm or less
This Utility
0.933 ppm
Legal Limit
10 ppm
National Average
0.935 ppm
State Average
0.582 ppm
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2017-2019.
ppm = parts per million
Health Risks
The EWG Health Guideline of 0.14 ppm for nitrate was defined by EWG . This health guideline protects against cancer and harm to fetal growth and development.
Pollution Sources
Agriculture
Runoff & Sprawl
Naturally Occurring
Filtering Options
Reverse Osmosis
Ion Exchange
Nitrate and nitrite
Potential Effect: cancer12x EWG'S HEALTH GUIDELINE
THIS UTILITY1.61 ppm
EWG HEALTH GUIDELINE0.14 ppm
LEGAL LIMIT10 ppm
X
Nitrate and nitrite
Nitrate and nitrite enter water from fertilizer runoff, septic tanks and urban runoff. These contaminants can cause oxygen deprivation for infants and increase the risk of cancer. Nitrite is significantly more toxic than nitrate. Click here to read more about nitrate.
Nitrate and nitrite was found at 12 times above EWG's Health Guideline.
EWG Health Guideline
0.14 ppm or less
This Utility
1.61 ppm
Legal Limit
10 ppm
National Average
0.888 ppm
State Average
0.657 ppm
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2017-2019.
ppm = parts per million
Health Risks
The health guideline of 0.14 parts per million, or ppm, for nitrate and nitrite is based on the equivalent health guideline for nitrate, as defined in a peer-reviewed scientific study by EWG. This guideline represents a one-in-one-million annual cancer risk level.
Pollution Sources
Agriculture
Runoff & Sprawl
Naturally Occurring
Filtering Options
Reverse Osmosis
Ion Exchange
Total trihalomethanes (TTHMs)†
Potential Effect: cancer113x EWG'S HEALTH GUIDELINE
THIS UTILITY16.9 ppb
EWG HEALTH GUIDELINE0.15 ppb
LEGAL LIMIT80 ppb
X
Total trihalomethanes (TTHMs)
Trihalomethanes are cancer-causing contaminants that form during water treatment with chlorine and other disinfectants. The total trihalomethanes group includes four chemicals: chloroform, bromodichloromethane, dibromochloromethane and bromoform.
Total trihalomethanes (TTHMs) was found at 113 times above EWG's Health Guideline.
EWG Health Guideline
0.15 ppb or less
This Utility
16.9 ppb
Legal Limit
80 ppb
National Average
29.7 ppb
State Average
27.3 ppb
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2017-2019.
ppb = parts per billion
Health Risks
The health guideline of 0.15 parts per billion, or ppb, for the group of four trihalomethanes, or THM4/TTHM, was defined in a peer-reviewed scientific study by EWG and represents a one-in-one-million lifetime cancer risk level.
Pollution Sources
Treatment Byproducts
Filtering Options
Activated Carbon
Reverse Osmosis
Trichloroacetic acid
Potential Effect: cancer31x EWG'S HEALTH GUIDELINE
THIS UTILITY3.12 ppb
EWG HEALTH GUIDELINE0.1 ppb
NO LEGAL LIMIT
X
Trichloroacetic acid
Trichloroacetic acid, one of the group of five haloacetic acids regulated by federal standards, is formed when chlorine or other disinfectants are used to treat drinking water. Haloacetic acids and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.
Trichloroacetic acid was found at 31 times above EWG's Health Guideline.
EWG Health Guideline
0.1 ppb or less
This Utility
3.12 ppb
National Average
6.62 ppb
State Average
2.79 ppb
NO LEGAL LIMIT
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2017-2019.
ppb = parts per billion
Health Risks
The EWG Health Guideline of 0.1 ppb for trichloroacetic acid was proposed in 2020 by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk.a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.
Pollution Sources
Treatment Byproducts
Filtering Options
Activated Carbon
Reverse Osmosis
Includes chemicals detected in 2017-2019 for which annual utility averages exceeded an EWG-selected health guideline established by a federal or state public health authority; chemicals detected under the EPA's Unregulated Contaminant Monitoring Rule (UCMR 3) program in 2013 to 2015 (and subsequent testing when available), for which annual utility averages exceeded a health guideline established by a federal or state public health authority; chemicals detected under the EPA's Unregulated Contaminant Monitoring Rule (UCMR 4) program in 2017 to 2020 (and subsequent testing when available), for which annual utility averages exceeded a health guideline established by a federal or state public health authority.
† HAA5 is a contaminant group that includes monochloroacetic acid, dichloroacetic acid, trichloroacetic acid, monobromoacetic acid and dibromoacetic acid. HAA9 is a contaminant group that includes the chemicals in HAA5 and bromochloroacetic acid, bromodichloroacetic acid, chlorodibromoacetic acid and tribromoacetic acid. TTHM is a contaminant group that includes bromodichloromethane, bromoform, chloroform and dibromochloromethane.
X
1,4-Dioxane
1,4-Dioxane is a solvent classified by the EPA as a likely human carcinogen. It contaminates groundwater in many states due to industrial wastewater discharges, plastic manufacturing runoff and landfill runoff.
How your levels compare
EWG Health Guideline
0.35 ppb or less
This Utility
0.0343 ppb
National Average
0.0681 ppb
State Average
0.00509 ppb
NO LEGAL LIMIT
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2013-2019.
ppb = parts per billion
Health Risks
The EWG Health Guideline of 0.35 ppb for 1,4-dioxane was defined by the Environmental Protection Agency as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.
Pollution Sources
Industry
Runoff & Sprawl
Filtering Options
Reverse Osmosis
X
Acetone
Acetone is a solvent used for many industrial purposes.
How your levels compare
This Utility
3.44 ppb
National Average
1.45 ppb
State Average
2.2 ppb
NO EWG HEALTH GUIDELINE
NO LEGAL LIMIT
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2017-2019.
ppb = parts per billion
Pollution Sources
Industry
Runoff & Sprawl
Naturally Occurring
X
Aluminum
Aluminum is a metal released from metal refineries and mining operations. Too much aluminum exposure can impair children's brain development.
How your levels compare
EWG Health Guideline
600 ppb or less
This Utility
14.8 ppb
National Average
22.7 ppb
State Average
34.7 ppb
NO LEGAL LIMIT
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2017-2019.
ppb = parts per billion
Health Risks
The EWG Health Guideline of 600 ppb for aluminum was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against harm to the brain and nervous system.
Pollution Sources
Industry
Naturally Occurring
Filtering Options
Reverse Osmosis
X
Antimony
Antimony is a naturally occurring metal that enters tap water from plumbing fittings and also from industrial uses, such as production of metal alloys, batteries and plastics. Antimony causes organ damage and shortens lifespans in studies of laboratory animals.
How your levels compare
EWG Health Guideline
1 ppb or less
This Utility
0.0208 ppb
Legal Limit
6 ppb
National Average
0.0154 ppb
State Average
0.014 ppb
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2017-2019.
ppb = parts per billion
Health Risks
The EWG Health Guideline of 1 ppb for antimony was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against change to the stomach and intestines.
Pollution Sources
Industry
Runoff & Sprawl
Naturally Occurring
Filtering Options
Reverse Osmosis
X
Atrazine
Atrazine is a herbicide commonly detected in drinking water that comes from cornfield and other agricultural runoff. It is a hormone disrupter that harms the male and female reproductive systems of people and wildlife.
How your levels compare
EWG Health Guideline
0.1 ppb or less
This Utility
0.14 ppb
Legal Limit
3 ppb
National Average
0.0194 ppb
State Average
0.0547 ppb
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2017-2019.
ppb = parts per billion
Health Risks
The EWG Health Guideline of 0.1 ppb for atrazine was defined by EWG based on epidemiological studies of human exposure to atrazine in drinking water.. This health guideline protects against harm to the developing fetus, harm to the reproductive system and hormone disruption.
Pollution Sources
Agriculture
Filtering Options
Activated Carbon
Reverse Osmosis
X
Barium is a mineral present in rocks, soil and water. High concentrations of barium in drinking water increase the risk of cardiovascular disease and hypertension.
How your levels compare
EWG Health Guideline
700 ppb or less
This Utility
26.7 ppb
Legal Limit
2,000 ppb
National Average
41.5 ppb
State Average
85.2 ppb
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2017-2019.
ppb = parts per billion
Health Risks
The EWG Health Guideline of 700 ppb for barium was defined by EWG as benchmark that protects against harm to the kidneys and the cardiovascular system.
Pollution Sources
Industry
Naturally Occurring
Filtering Options
Reverse Osmosis
Ion Exchange
X
Bromoform
Bromoform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromoform and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.
How your levels compare
EWG Health Guideline
0.5 ppb or less
This Utility
0.208 ppb
National Average
1.32 ppb
State Average
3.19 ppb
NO LEGAL LIMIT
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2017-2019.
ppb = parts per billion
Health Risks
The EWG Health Guideline of 0.5 ppb for bromoform was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.
Pollution Sources
Treatment Byproducts
Filtering Options
Activated Carbon
Reverse Osmosis
X
Chlorate
Chlorate forms in drinking water as a byproduct of disinfection. Chlorate impairs thyroid function, making chlorate exposure most harmful during pregnancy and childhood.
How your levels compare
EWG Health Guideline
210 ppb or less
This Utility
68.2 ppb
National Average
114.8 ppb
State Average
123.7 ppb
NO LEGAL LIMIT
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2013-2019.
ppb = parts per billion
Health Risks
The EWG Health Guideline of 210 ppb for chlorate was defined by the Environmental Protection Agency as a benchmark for testing under the Unregulated Contaminant Monitoring Rule program. This health guideline protects against hormone disruption.
Pollution Sources
Agriculture
Industry
Treatment Byproducts
X
Chromium (total)
Chromium is a naturally occurring metal, but industrial uses can elevate its levels in water. One form, hexavalent chromium, causes cancer. Total chromium is not a good indicator of the amount of hexavalent chromium in drinking water.
How your levels compare
This Utility
0.593 ppb
Legal Limit
100 ppb
National Average
0.579 ppb
State Average
0.413 ppb
NO EWG HEALTH GUIDELINE
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2017-2019.
ppb = parts per billion
Pollution Sources
Industry
Naturally Occurring
Filtering Options
Reverse Osmosis
Ion Exchange
X
Cyanide
Cyanide is a toxic chemical that causes central nervous system and thyroid toxicity. Water contamination is generally the result of metal mining and chemical industry waste, runoff from agriculture and road salts used for melting ice.
How your levels compare
This Utility
48 ppb
Legal Limit
200 ppb
National Average
4.41 ppb
State Average
34.2 ppb
NO EWG HEALTH GUIDELINE
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2017-2019.
ppb = parts per billion
Pollution Sources
Agriculture
Industry
Runoff & Sprawl
Naturally Occurring
Filtering Options
Reverse Osmosis
Ion Exchange
X
Fluoride
Fluoride occurs naturally in surface and groundwater and is also added to drinking water by many water systems.
How your levels compare
This Utility
0.387 ppm
Legal Limit
4 ppm
National Average
0.489 ppm
State Average
0.518 ppm
NO EWG HEALTH GUIDELINE
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2017-2019.
ppm = parts per million
Pollution Sources
Treatment Byproducts
Filtering Options
Reverse Osmosis
X
Manganese
Manganese is a naturally occurring element that is common in food and drinking water. Excessive manganese exposures may impair children's attention, memory and intellectual capacity. Click here to read more about manganese.
How your levels compare
EWG Health Guideline
100 ppb or less
This Utility
27 ppb
National Average
10.1 ppb
State Average
6.19 ppb
NO LEGAL LIMIT
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2017-2019.
ppb = parts per billion
Health Risks
The EWG Health Guideline of 100 ppb for manganese was defined by the state of Minnesota as a health risk limit, the concentration of a contaminant that can be consumed with little or no risk to health. This health guideline protects against harm to the brain and nervous system.
Pollution Sources
Industry
Naturally Occurring
Filtering Options
Ion Exchange
X
Molybdenum
Molybdenum is a metal that occurs naturally in soil, minerals and water. People who ingest large amounts can have increased levels of uric acid and gout-like symptoms.
How your levels compare
EWG Health Guideline
40 ppb or less
This Utility
2.28 ppb
National Average
1.52 ppb
State Average
2.21 ppb
NO LEGAL LIMIT
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2013-2019.
ppb = parts per billion
Health Risks
The EWG Health Guideline of 40 ppb for molybdenum was defined by the Environmental Protection Agency as a benchmark for testing under the Unregulated Contaminant Monitoring Rule program. This health guideline protects against metabolic changes and excess formation of uric acid in the blood.
Pollution Sources
Industry
Naturally Occurring
Filtering Options
Reverse Osmosis
Ion Exchange
X
Monobromoacetic acid
Monobromoacetic acid, one of the group of five haloacetic acids regulated by federal standards, is formed when chlorine or other disinfectants are used to treat drinking water. Haloacetic acids and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.
How your levels compare
EWG Health Guideline
25 ppb or less
This Utility
0.409 ppb
National Average
0.227 ppb
State Average
0.272 ppb
NO LEGAL LIMIT
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2017-2019.
ppb = parts per billion
Health Risks
The EWG Health Guideline of 25 ppb for monobromoacetic acid was proposed in 2020 by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk.. This health guideline protects against muscular degeneration.
Pollution Sources
Treatment Byproducts
Filtering Options
Activated Carbon
Reverse Osmosis
X
Monochloroacetic acid
Monochloroacetic acid, one of the group of five haloacetic acids regulated by federal standards, is formed when chlorine or other disinfectants are used to treat drinking water. Haloacetic acids and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.
How your levels compare
EWG Health Guideline
53 ppb or less
This Utility
1.53 ppb
National Average
0.495 ppb
State Average
0.723 ppb
NO LEGAL LIMIT
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2017-2019.
ppb = parts per billion
Health Risks
The EWG Health Guideline of 53 ppb for monochloroacetic acid was proposed in 2020 by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk.. This health guideline protects against system toxicity.
Pollution Sources
Treatment Byproducts
Filtering Options
Activated Carbon
Reverse Osmosis
X
Nitrite
Nitrite, closely related to the fertilizer chemical nitrate, comes from urban runoff and from fertilizer applied to agricultural lands to pollute drinking water. Nitrite is significantly more toxic than nitrate. Excessive nitrite in water can cause oxygen deprivation in infants and increase the risk of cancer.
How your levels compare
This Utility
0.07 ppm
Legal Limit
1 ppm
National Average
0.00331 ppm
State Average
0.00713 ppm
NO EWG HEALTH GUIDELINE
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2017-2019.
ppm = parts per million
Pollution Sources
Agriculture
Runoff & Sprawl
Naturally Occurring
Filtering Options
Reverse Osmosis
Ion Exchange
X
Selenium
Selenium is an essential element in diets. But too much selenium can decrease thyroid hormone production and cause hair loss, skin lesions and brittle fingernails.
How your levels compare
EWG Health Guideline
30 ppb or less
This Utility
0.447 ppb
Legal Limit
50 ppb
National Average
0.373 ppb
State Average
1.02 ppb
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2017-2019.
ppb = parts per billion
Health Risks
The EWG Health Guideline of 30 ppb for selenium was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against hair loss and nail damage.
Pollution Sources
Industry
Naturally Occurring
Filtering Options
Reverse Osmosis
X
Simazine
Simazine is a hormone-disrupting herbicide related to atrazine. It affects the male and female reproductive systems. In studies of laboratory animals, simazine increases blood levels of estrogen, decreases prolactin and progesterone, and causes mammary and ovarian tumors.
How your levels compare
EWG Health Guideline
0.1 ppb or less
This Utility
0.123 ppb
Legal Limit
4 ppb
National Average
0.00359 ppb
State Average
0.0159 ppb
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2017-2019.
ppb = parts per billion
Health Risks
The EWG Health Guideline of 0.1 ppb for simazine was defined by EWG based on epidemiological studies of human exposure to atrazine in drinking water. This health guideline protects against harm to the developing fetus, harm to the reproductive system and hormone disruption.
Pollution Sources
Agriculture
Filtering Options
Activated Carbon
Reverse Osmosis
X
Strontium
Strontium is a metal that accumulates in the bones. Radioactive strontium-90 can cause bone cancer and leukemia, and any form of strontium at high doses can harm bone health.
How your levels compare
EWG Health Guideline
1,500 ppb or less
This Utility
0.301 ppb
National Average
3.33 ppb
State Average
0.592 ppb
NO LEGAL LIMIT
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2013-2019.
ppb = parts per billion
Health Risks
The EWG Health Guideline of 1,500 ppb for strontium was defined by the Environmental Protection Agency as a benchmark for testing under the Unregulated Contaminant Monitoring Rule program. This health guideline protects against harm to bones.
Pollution Sources
Industry
Naturally Occurring
Filtering Options
Reverse Osmosis
Ion Exchange
X
Vanadium
Vanadium is a metal used in steels and other alloys. People are commonly exposed to vanadium in water and food. Excessive exposure can be toxic during pregnancy and childhood.
How your levels compare
EWG Health Guideline
21 ppb or less
This Utility
0.123 ppb
National Average
1.59 ppb
State Average
2.46 ppb
NO LEGAL LIMIT
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2013-2019.
ppb = parts per billion
Health Risks
The EWG Health Guideline of 21 ppb for vanadium was defined by the Environmental Protection Agency as a benchmark for testing under the Unregulated Contaminant Monitoring Rule program. This health guideline protects against change in blood chemistry.
Pollution Sources
Industry
Naturally Occurring
Filtering Options
Ion Exchange
Includes chemicals detected in 2017-2019 for which annual utility averages were lower than an EWG-selected health guideline established by a federal or state public health authority; chemicals detected under the EPA's Unregulated Contaminant Monitoring Rule (UCMR 3) program in 2013 to 2015 (and subsequent testing when available), for which annual utility averages were lower than an EWG-selected health guideline established by a federal or state public health authority.
Other Contaminants Tested
✕
Chemicals tested for but not detected from 2014 to 2019:
1,1,1,2-Tetrachloroethane , 1,1,1-Trichloroethane , 1,1,2,2-Tetrachloroethane , 1,1,2-Trichloroethane , 1,1-Dichloroethane , 1,1-Dichloroethylene , 1,1-Dichloropropene , 1,2,3-Trichlorobenzene , 1,2,3-Trichloropropane , 1,2,4-Trichlorobenzene , 1,2,4-Trimethylbenzene , 1,2-Dibromo-3-chloropropane (DBCP) , 1,2-Dichloroethane , 1,2-Dichloropropane , 1,3,5-Trimethylbenzene , 1,3-Butadiene , 1,3-Dichloropropane , 1-butanol , 2,2-Dichloropropane , 2,4,5-T , 2,4,5-TP (Silvex) , 2,4-D , 2,4-DB , 2-Hexanone , 2-methoxyethanol , 2-propen-1-ol , 3,5-Dichlorobenzoic acid , 3-Hydroxycarbofuran , Acifluorfen (Blazer) , Acrylonitrile , Alachlor (Lasso) , Aldicarb , Aldicarb sulfone , Aldicarb sulfoxide , Aldrin , alpha-Chlordane , Alpha-hexachlorocyclohexane , Baygon (Propoxur) , Bentazon (Basagran) , Benzene , Benzo[a]pyrene , Beryllium , Bromacil , Bromobenzene , Bromochloromethane , Bromomethane , Butachlor , Butylated hydroxyanisole , Cadmium , Carbaryl , Carbofuran , Carbon tetrachloride , Chloramben , Chlordane , Chlorodifluoromethane , Chloroethane , Chloromethane , Chlorpyriphos , cis-1,2-Dichloroethylene , cis-1,3-Dichloropropene , Cobalt , Combined uranium , Dalapon , Di(2-ethylhexyl) adipate , Di(2-ethylhexyl) phthalate , Dibromomethane , Dicamba , Dichlorodifluoromethane , Dichloromethane (methylene chloride) , Dichlorprop , Dieldrin , Dimethipin , Dinoseb , Endrin , Ethoprop , Ethyl methacrylate , Ethylbenzene , Ethylene dibromide , gamma-Chlordane , Germanium , Heptachlor , Heptachlor epoxide , Hexachlorobenzene (HCB) , Hexachlorobutadiene , Hexachlorocyclopentadiene , Iodomethane , Isopropylbenzene , Lindane , m-Dichlorobenzene , Mercury (inorganic) , Methiocarb , Methomyl , Methoxychlor , Methyl ethyl ketone , Methyl isobutyl ketone , Methyl methacrylate , Metolachlor , Metribuzin , Monochlorobenzene (chlorobenzene) , MTBE , n-Butylbenzene , n-Propylbenzene , Naphthalene , o-Chlorotoluene , o-Dichlorobenzene , o-toluidine , Oxamyl (Vydate) , Oxyflurofen , p-Chlorotoluene , p-Dichlorobenzene , p-Isopropyltoluene , Pentachlorophenol , Perfluorobutane sulfonate (PFBS) , Perfluoroheptanoic acid (PFHPA) , Perfluorohexane sulfonate (PFHXS) , Perfluorononanoic acid (PFNA) , Perfluorooctane sulfonate (PFOS) , Perfluorooctanoic acid (PFOA) , Permethrin , Picloram , Polychlorinated biphenyls (PCBs) , Profenofos , Propachlor , Quinoline , Radium, combined (-226 & -228) , sec-Butylbenzene , Silver , Styrene , Tebuconazole , tert-Butylbenzene , Tetrachloroethylene (perchloroethylene) , Tetrahydrofuran , Thallium , Toluene , Toxaphene , trans-1,2-Dichloroethylene , trans-1,2-Dichloropropene , trans-Nonachlor , Tribufos , Trichloroethylene , Trichlorofluoromethane , Vinyl acetate , Vinyl chloride , Xylenes (total)
City of Lewisville compliance with legally mandated federal standards:
- From April 2019 to March 2021, City of Lewisvillecomplied with health-based drinking water standards.
Information in this section on City of Lewisville comes from the U.S. EPA Enforcement and Compliance History Online database (ECHO).
Water Filters That Can Reduce Contaminant Levels
| Contaminant | Activated Carbon | Reverse Osmosis | Ion Exchange |
| CONTAMINANTS ABOVE HEALTH GUIDELINES | |||
| Arsenic | ✔ | ✔ | |
| Bromochloroacetic acid | ✔ | ✔ | |
| Bromodichloromethane | ✔ | ✔ | |
| Chloroform | ✔ | ✔ | |
| Chromium (hexavalent) | ✔ | ✔ | |
| Dibromoacetic acid | ✔ | ✔ | |
| Dibromochloromethane | ✔ | ✔ | |
| Dichloroacetic acid | ✔ | ✔ | |
| Haloacetic acids (HAA5) | ✔ | ✔ | |
| Haloacetic acids (HAA9) | ✔ | ✔ | |
| Nitrate | ✔ | ✔ | |
| Nitrate & nitrite | ✔ | ✔ | |
| Total trihalomethanes (TTHMs) | ✔ | ✔ | |
| Trichloroacetic acid | ✔ | ✔ | |
| OTHER CONTAMINANTS DETECTED | |||
| 1,4-Dioxane | ✔ | ||
| Acetone | |||
| Aluminum | ✔ | ||
| Antimony | ✔ | ||
| Atrazine | ✔ | ✔ | |
| Barium | ✔ | ✔ | |
| Bromoform | ✔ | ✔ | |
| Chlorate | |||
| Chromium (total) | ✔ | ✔ | |
| Cyanide | ✔ | ✔ | |
| Fluoride | ✔ | ||
| Manganese | ✔ | ||
| Molybdenum | ✔ | ✔ | |
| Monobromoacetic acid | ✔ | ✔ | |
| Monochloroacetic acid | ✔ | ✔ | |
| Nitrite | ✔ | ✔ | |
| Selenium | ✔ | ||
| Simazine | ✔ | ✔ | |
| Strontium | ✔ | ✔ | |
| Vanadium | ✔ | ||
Take Action
Contact Your Local Official
One of the best ways to push for cleaner water is to hold accountable the elected officials who have a say in water quality – from city hall and the state legislature to Congress all the way to the Oval Office – by asking questions and demanding answers.
Filter Out Contaminants
Check out our recommendations for filters to protect your water against the detected contaminants.
