Water Quality Report · Updated October 07, 2026
EAU CLAIRE WATERWORKS
EAU CLAIRE WATERWORKS delivers tap water graded C (65/100) by TapWaterSafety.org. The utility serves approximately 70,587 residents in EAU CLAIRE, Wisconsin using groundwater. The most significant water quality concerns are: PFAS contamination; Perfluorohexane sulfonate (PFHXS) significantly above health guideline; Total PFOS and PFOA significantly above health guideline; Haloacetic acids (HAA9) significantly above health guideline.
Is EAU CLAIRE tap water safe to drink?
EAU CLAIRE WATERWORKS delivers tap water that earns a grade of C (65/100) from TapWaterSafety.org — an average rating, with several contaminants above health guidelines but generally compliant with US legal limits.
The utility serves 70,587 residents in EAU CLAIRE, drawing from groundwater.
Public testing data identifies 16 contaminants in this water above EWG's health-based guidelines, including: Perfluorohexane sulfonate (PFHXS), Perfluorooctane sulfonate (PFOS), Total PFOS and PFOA, Haloacetic acids (HAA9), Total trihalomethanes (TTHMs), Haloacetic acids (HAA5), Chloroform, Trichloroacetic acid, Perfluorooctanoic acid (PFOA), Chromium (hexavalent), Bromodichloromethane, Nitrate and nitrite, Dichloroacetic acid, Nitrate, Radium, combined (-226 and -228), Tetrachloroethylene (perchloroethylene). For most residents, a properly certified home filter at the kitchen tap is the most cost-effective way to reduce exposure to whatever's in your water. See our filter recommendations below, matched specifically to this utility's contaminant profile.
EPA compliance record
Official U.S. EPA records for EAU CLAIRE WATERWORKS (system ID WI6180230) for the last 3 years. Checked 2026-10-07.
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Quick actions for EAU CLAIRE residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for EAU CLAIRE WATERWORKS.
PFAS contamination
Severe concernPerfluorooctane sulfonate (PFOS), Perfluorooctanoic acid (PFOA) detected. PFAS are persistent chemicals linked to cancer and immune effects with no known safe exposure threshold.
Perfluorohexane sulfonate (PFHXS) significantly above health guideline
Moderate concernPerfluorohexane sulfonate (PFHXS) detected at 10.5 ppt, 10500x above the EWG health guideline of 0.001 ppt.
Total PFOS and PFOA significantly above health guideline
Moderate concernTotal PFOS and PFOA detected at 7.3 ppt, 1043x above the EWG health guideline of 0.007 ppt.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 10.4 ppb, 174x above the EWG health guideline of 0.06 ppb.
Contact EAU CLAIRE WATERWORKS
Reach the utility directly for service issues, water quality concerns, or to request your Consumer Confidence Report.
General Contact
Treatment Plant
Recommended water filters for EAU CLAIRE
Filters matched to the specific contaminants in this water supply.
Filter certified for PFOA/PFOS (NSF/ANSI 53 or 58)
$180-$750Reverse osmosis and some carbon block filters reduce PFAS. Look for certification to NSF/ANSI 53 or 58 for PFOA/PFOS.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
Score breakdown
This utility's overall score of 65/100 breaks down across five weighted components. Read the full methodology →
Contaminants detected — international standards comparison
Every contaminant detected, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal (the strictest US benchmark). Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Perfluorohexane sulfonate (PFHXS) PFAS |
10.5 ppt | 0.001 | 10.0 | — | — | — | — | EPA violation |
| Perfluorooctane sulfonate (PFOS) PFAS |
4.38 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | EPA violation |
| Total PFOS and PFOA PFAS |
7.3 ppt | 0.007 | — | 100 | 100 | 0.007 | — | 1043× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
10.4 ppb | 0.06 | — | — | — | — | — | 174× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
23.2 ppb | 0.15 | 80.0 | 100 | — | — | — | 155× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
4.23 ppb | 0.1 | 60.0 | 60 | — | — | — | 42× over |
| Chloroform Disinfection byproduct |
16.2 ppb | 0.4 | — | — | — | — | — | 41× over |
| Trichloroacetic acid Disinfection byproduct |
2.45 ppb | 0.1 | — | — | — | — | — | 25× over |
| Perfluorooctanoic acid (PFOA) PFAS |
1.46 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | 16× over |
| Chromium (hexavalent) Heavy metal |
0.306 ppb | 0.02 | — | — | — | — | — | 15× over |
| Bromodichloromethane Disinfection byproduct |
0.817 ppb | 0.06 | — | — | — | — | — | 14× over |
| Nitrate and nitrite Inorganic |
1.33 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 9.5× over |
| Dichloroacetic acid Disinfection byproduct |
1.78 ppb | 0.2 | — | — | — | — | — | 8.9× over |
| Nitrate Inorganic |
1.1 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 7.9× over |
| Radium, combined (-226 and -228) Radiological |
0.17 pCi/L | 0.05 | 5.0 | — | — | — | — | 3.3× over |
| Tetrachloroethylene (perchloroethylene) Volatile organic compound |
0.108 ppb | 0.06 | 5.0 | — | — | — | — | 1.8× over |
| Chlorate Disinfection byproduct |
86.9 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Dibromochloromethane Disinfection byproduct |
0.0307 ppb | 0.1 | — | — | — | — | — | Below guideline |
| Trichloroethylene Volatile organic compound |
0.0718 ppb | 0.4 | 5.0 | 10 | 20 | 1.7 | — | Below guideline |
| Bromoform Disinfection byproduct |
0.048 ppb | 0.5 | — | — | — | — | — | Below guideline |
| Vanadium Other |
0.661 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
1.52 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Barium Heavy metal |
2.8 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
0.9 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
1.75 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Perfluoroheptanoic acid (PFHPA) PFAS |
0.395 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.0498 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.571 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Nitrite Inorganic |
0.043 ppm | — | 1.0 | — | — | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
EAU CLAIRE WATERWORKS service area
This water system serves 1 community in Eau Claire County, Wisconsin. Click any city for its dedicated tap water quality page.
Find the right filter for EAU CLAIRE water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.