Overview
EWG's drinking water quality report shows results of tests conducted by the water utility and provided to the Environmental Working Group by the Washington State Department of Health, as well as information from the U.S. EPA Enforcement and Compliance History database (ECHO). For the latest quarter assessed by the U.S. EPA (April 2024 - June 2024), tap water provided by this water utility was in compliance with federal health-based drinking water standards.
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.
Contaminants Detected
Nitrate
Potential Effect: cancer
This Utility: 1.25 ppm
Legal Limit: 10 ppm
8.9x
EWG's Health Guideline: 0.14 ppm
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 8.9 times above EWG's Health Guideline.
EWG Health Guideline
This Utility
Legal Limit
National Average
State Average
Health Risks
The EWG 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.
Understanding the Data
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2021-2023.
ppm = parts per millionPollution Sources
Agriculture
Runoff & Sprawl
Naturally Occurring
Filtering Options
Reverse Osmosis
Ion Exchange
Perfluorohexane sulfonate (PFHXS)
Potential Effect:
This Utility: 59.5 ppt
Legal Limit: 10 ppt
59,500x
EWG's Health Guideline: 0.001 ppt
Perfluorohexane sulfonate (PFHXS)
Perfluorohexane sulfonate is a member of a group of perfluorinated chemicals used in many consumer products. Perfluorinated chemicals can cause serious health effects, including cancer, endocrine disruption, accelerated puberty, liver and immune system damage, and thyroid changes. These chemicals are persistent in the environment and they accumulate in people. Click here to read more about perfluorinated chemicals.
Perfluorohexane sulfonate (PFHXS) was found at 59,500 times above EWG's Health Guideline.
EWG Health Guideline
This Utility
Legal Limit
National Average
State Average
Health Risks
The EWG Health Guideline of 0.001 ppt for perfluorohexane sulfonate was defined by EPA's toxicity value published in the Integrated Risk Information System's toxicological review. This health guideline harm to the developing immune system.
Understanding the Data
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2013-2024.
ppt = parts per trillionPollution Sources
Industry
Runoff & Sprawl
Filtering Options
Activated Carbon
Reverse Osmosis
Perfluorooctane sulfonate (PFOS)
Potential Effect:
This Utility: 14.7 ppt
Proposed Legal Limit: 4 ppt
49x
EWG's Health Guideline: 0.3 ppt
Perfluorooctane sulfonate (PFOS)
Perfluorooctane sulfonate (PFOS) is a member of a group of perfluorinated chemicals used in many consumer products. PFOS and other perfluorinated chemicals can cause serious health effects, including cancer, endocrine disruption, accelerated puberty, liver and immune system damage, and thyroid changes. These chemicals are persistent in the environment and they accumulate in people. Click here to read more about perfluorinated chemicals.
Perfluorooctane sulfonate (PFOS) was found at 49 times above EWG's Health Guideline.
EWG Health Guideline
This Utility
Proposed Legal Limit
National Average
State Average
Health Risks
The EWG Health Guideline of 0.3 ppt for PFOS was defined by EPA's final toxicity value from the Office of Water’s Final Human Health Toxicity Assessment. This health guideline protects againat cardiovascular harm and harm to fetal growth.
Understanding the Data
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2013-2024.
ppt = parts per trillionPollution Sources
Industry
Runoff & Sprawl
Filtering Options
Activated Carbon
Reverse Osmosis
Perfluorooctanoic acid (PFOA)
Potential Effect: cancer
This Utility: 2.45 ppt
Proposed Legal Limit: 4 ppt
27x
EWG's Health Guideline: 0.09 ppt
Perfluorooctanoic acid (PFOA)
Perfluorooctanoic acid (PFOA) is a member of a group of perfluorinated chemicals used in many consumer products. PFOA and other perfluorinated chemicals can cause serious health effects, including cancer, endocrine disruption, accelerated puberty, liver and immune system damage, and thyroid changes. These chemicals are persistent in the environment and they accumulate in people. Click here to read more about perfluorinated chemicals.
Perfluorooctanoic acid (PFOA) was found at 27 times above EWG's Health Guideline.
EWG Health Guideline
This Utility
Proposed Legal Limit
National Average
State Average
Health Risks
The EWG Health Guideline of 0.09 ppt for PFOA was was defined by EPA's final toxicity value from the Office of Water’s Final Human Health Toxicity Assessment. This health guideline protects againat cardiovascular harm and harm to fetal growth.
Understanding the Data
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2013-2024.
ppt = parts per trillionPollution Sources
Industry
Runoff & Sprawl
Filtering Options
Activated Carbon
Reverse Osmosis
Perfluoropentane sulfonic acid (PFPeS)
Potential Effect:
This Utility: 20.1 ppt
No Legal Limit
20x
EWG's Health Guideline: 1 ppt
Perfluoropentane sulfonic acid (PFPeS)
Perfluoropentane sulfonic acid (PFPeS) is a member of a group of perfluorinated chemicals used in many consumer products. PFPeS and other perfluorinated chemicals can cause serious health effects, including cancer, endocrine disruption, accelerated puberty, liver and immune system damage, and thyroid changes. These chemicals are persistent in the environment and they accumulate in people. Click here to read more about perfluorinated chemicals.
Perfluoropentane sulfonic acid (PFPeS) was found at 20 times above EWG's Health Guideline.
EWG Health Guideline
This Utility
National Average
State Average
Health Risks
The EWG Health Guideline of 1 ppt for PFPeS was defined by EWG as based on studies by Phillipe Grandjean of Harvard University and many other independent researchers who found reduced effectiveness of vaccines and adverse impacts on mammary gland development from exposure to PFOA and PFOS, the two PFAS most widely detected in drinking water.
Understanding the Data
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2018-2024.
ppt = parts per trillionPollution Sources
Industry
Runoff & Sprawl
Filtering Options
Activated Carbon
Reverse Osmosis
Total PFOS and PFOA
Potential Effect:
This Utility: 17.2 ppt
No Legal Limit
2,450x
EWG's Health Guideline: 0.007 ppt
Total PFOS and PFOA
Perfluorooctane sulfonate (PFOS) and Perfluorooctanoic acid (PFOA) are a member of a group of perfluorinated chemicals used in many consumer products. PFOS, PFOA and other perfluorinated chemicals can cause serious health effects, including cancer, endocrine disruption, accelerated puberty, liver and immune system damage, and thyroid changes. These chemicals are persistent in the environment and they accumulate in people. Click here to read more about perfluorinated chemicals.
Total PFOS and PFOA was found at 2,450 times above EWG's Health Guideline.
EWG Health Guideline
This Utility
National Average
State Average
Health Risks
EWG applied the health guideline of 0.09 ppt, defined by the California Office of Environmental Health Hazard Assessment as a public health goal for PFOA, to PFOS and PFOA combined. This health guideline protects against cancer.
Understanding the Data
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2021-2023.
ppt = parts per trillionPollution Sources
Industry
Runoff & Sprawl
Filtering Options
Activated Carbon
Reverse Osmosis
Includes chemicals detected in 2021-2023 for which annual utility averages exceeded an EWG-selected health guideline established by a federal or state public health authority.
Perfluorobutane sulfonate (PFBS)
This Utility: 32.5 ppt
No Legal Limit
EWG's Health Guideline: 2,000 ppt
Perfluorobutane sulfonate (PFBS)
Perfluorobutane sulfonate (PFBS) is a member of a group of perfluorinated chemicals used in many consumer products. PFOS and other perfluorinated chemicals can cause serious health effects, including cancer, endocrine disruption, accelerated puberty, liver and immune system damage, and thyroid changes. These chemicals are persistent in the environment and they accumulate in people. Click here to read more about perfluorinated chemicals.
How your levels compare
EWG Health Guideline
This Utility
National Average
State Average
Health Risks
The EWG Health Guideline of 2,000 ppt for perfluorobutane sulfonate was defined by EPA’s Human Health toxicity value. This health guideline hormone disruption and harm to fetal growth and child development.
Understanding the Data
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2013-2024.
ppt = parts per trillionPollution Sources
Industry
Runoff & Sprawl
Filtering Options
Activated Carbon
Reverse Osmosis
Perfluorobutanoic Acid (PFBA)
This Utility: 2.60 ppt
No Legal Limit
EWG's Health Guideline: 1,000 ppt
Perfluorobutanoic Acid (PFBA)
Perfluorobutanoic acid (PFBA) is a member of a group of perfluorinated chemicals used in many consumer products. PFOS and other perfluorinated chemicals can cause serious health effects, including cancer, endocrine disruption, accelerated puberty, liver and immune system damage, and thyroid changes. These chemicals are persistent in the environment and they accumulate in people. Click here to read more about perfluorinated chemicals.
How your levels compare
EWG Health Guideline
This Utility
National Average
State Average
Health Risks
The EWG Health Guideline of 1,000 ppt for perfluorobutanoic acid was defined by EPA's recommended application of the toxicity value for PFHxA published in the Integrated Risk Information System’s toxicological review. This health guideline protects against harm to fetal growth and child development.
Understanding the Data
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2018-2024.
ppt = parts per trillionPollution Sources
Industry
Runoff & Sprawl
Filtering Options
Activated Carbon
Reverse Osmosis
Perfluorohexanoic Acid (PFHxA)
This Utility: 5.79 ppt
No Legal Limit
EWG's Health Guideline: 1,000 ppt
Perfluorohexanoic Acid (PFHxA)
Perfluorohexanoic acid is a member of a group of perfluorinated chemicals used in many consumer products. Perfluorinated chemicals can cause serious health effects, including cancer, endocrine disruption, accelerated puberty, liver and immune system damage, and thyroid changes. These chemicals are persistent in the environment and they accumulate in people. Click here to read more about perfluorinated chemicals.
How your levels compare
EWG Health Guideline
This Utility
National Average
State Average
Health Risks
The EWG Health Guideline of 1,000 ppt for perfluorohexanoic acid was defined by EPA's toxicity value published in the Integrated Risk Information System's toxicological review. This health guideline protects against harm to fetal growth and child development.
Understanding the Data
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2018-2024.
ppt = parts per trillionPollution Sources
Industry
Runoff & Sprawl
Filtering Options
Activated Carbon
Reverse Osmosis
Perfluoropentanoic Acid (PFPeA)
This Utility: 3.77 ppt
No Legal Limit
EWG's Health Guideline: 1,000 ppt
Perfluoropentanoic Acid (PFPeA)
Perfluoropentanoic Acid (PFPeA) is a member of a group of perfluorinated chemicals used in many consumer products. PFOS and other perfluorinated chemicals can cause serious health effects, including cancer, endocrine disruption, accelerated puberty, liver and immune system damage, and thyroid changes. These chemicals are persistent in the environment and they accumulate in people. Click here to read more about perfluorinated chemicals.
How your levels compare
EWG Health Guideline
This Utility
National Average
State Average
Health Risks
The EWG Health Guideline of 1,000 ppt for PFPeA was defined by EPA's recommended application of the toxicity value for PFHxA published in the Integrated Risk Information System’s toxicological review. This health guideline protects against harm to fetal growth and child development.
Understanding the Data
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2018-2024.
ppt = parts per trillionPollution Sources
Industry
Runoff & Sprawl
Filtering Options
Activated Carbon
Reverse Osmosis
PFOS + PFOA + PFHxS + PFNA
This Utility: 76.7 ppt
No Legal Limit
No EWG Health Guideline
PFOS + PFOA + PFHxS + PFNA
How your levels compare
This Utility
National Average
State Average
Understanding the Data
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2021-2023.
ppt = parts per trillionPollution Sources
Industry
Filtering Options
Activated Carbon
Reverse Osmosis
Includes chemicals detected in 2021-2023 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
✕Find A Filter
Explore filter options for each contaminant. See which technologies are effective at reducing specific contaminants to help you make an informed decision on the best water treatment solution for your needs.
| CONTAMINANTS ABOVE HEALTH GUIDELINES | activated carbon | reverse osmosis | ion exchange |
| Nitrate | |||
| Perfluorohexane sulfonate (PFHXS) | |||
| Perfluorooctane sulfonate (PFOS) | |||
| Perfluorooctanoic acid (PFOA) | |||
| Perfluoropentane sulfonic acid (PFPeS) | |||
| Total PFOS and PFOA | |||
| OTHER CONTAMINANTS DETECTED | activated carbon | reverse osmosis | ion exchange |
| Perfluorobutane sulfonate (PFBS) | |||
| Perfluorobutanoic acid (PFBA) | |||
| Perfluorohexanoic Acid (PFHxA) | |||
| Perfluoropentanoic acid (PFPeA) | |||
| PFOS + PFOA + PFHxS + PFNA |
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