Tap Water Quality Report
Tap water quality in JANESVILLE, Wisconsin
Tap water in JANESVILLE, Wisconsin receives a grade of D (62/100) from TapWaterSafety.org. It's served by JANESVILLE WATER UTILITY. The most significant water quality concerns are: PFAS contamination; Perfluorohexane sulfonate (PFHXS) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline; Bromodichloromethane significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in JANESVILLE's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving JANESVILLE.
PFAS contamination
Severe concernTotal PFOS and PFOA, Perfluorooctane sulfonate (PFOS) 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 0.348 ppt, 348x above the EWG health guideline of 0.001 ppt.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 15.9 ppb, 106x above the EWG health guideline of 0.15 ppb.
Bromodichloromethane significantly above health guideline
Moderate concernBromodichloromethane detected at 2.45 ppb, 41x above the EWG health guideline of 0.06 ppb.
EPA compliance record
Official U.S. EPA records for JANESVILLE WATER UTILITY (system ID WI1540127) 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.
Recommended filters for JANESVILLE
Filters matched to the specific contaminants in JANESVILLE's 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 like TTHM. Look for NSF/ANSI 53 VOC or chloroform reduction.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
All contaminants detected in JANESVILLE's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. 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 |
0.348 ppt | 0.001 | 10.0 | — | — | — | — | 348× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
15.9 ppb | 0.15 | 80.0 | 100 | — | — | — | 106× over |
| Bromodichloromethane Disinfection byproduct |
2.45 ppb | 0.06 | — | — | — | — | — | 41× over |
| Nitrate Inorganic |
5.77 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 41× over |
| Nitrate and nitrite Inorganic |
5.31 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 38× over |
| Radium, combined (-226 and -228) Radiological |
1.86 pCi/L | 0.05 | 5.0 | — | — | — | — | 37× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
1.87 ppb | 0.06 | — | — | — | — | — | 31× over |
| Dibromochloromethane Disinfection byproduct |
3.03 ppb | 0.1 | — | — | — | — | — | 30× over |
| Total PFOS and PFOA PFAS |
0.209 ppt | 0.007 | — | 100 | 100 | 0.007 | — | 30× over |
| Chromium (hexavalent) Heavy metal |
0.546 ppb | 0.02 | — | — | — | — | — | 27× over |
| Dibromoacetic acid Disinfection byproduct |
0.563 ppb | 0.03 | — | — | — | — | — | 19× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
1.38 ppb | 0.1 | 60.0 | 60 | — | — | — | 14× over |
| Chloroform Disinfection byproduct |
1.65 ppb | 0.4 | — | — | — | — | — | 4.1× over |
| Bromoform Disinfection byproduct |
1.7 ppb | 0.5 | — | — | — | — | — | 3.4× over |
| Trichloroacetic acid Disinfection byproduct |
0.328 ppb | 0.1 | — | — | — | — | — | 3.3× over |
| Dichloroacetic acid Disinfection byproduct |
0.42 ppb | 0.2 | — | — | — | — | — | 2.1× over |
| Uranium Radiological |
0.53 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 1.2× over |
| Perfluorooctane sulfonate (PFOS) PFAS |
0.128 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | Below guideline |
| Perfluorooctanoic acid (PFOA) PFAS |
0.032 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | Below guideline |
| Manganese Heavy metal |
29.3 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Barium Heavy metal |
50.0 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Atrazine Pesticide/Herbicide |
0.00237 ppb | 0.1 | 3.0 | 0.1 | 100 | 0.15 | — | Below guideline |
| Vanadium Other |
0.455 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.0633 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
0.292 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.0972 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
0.062 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Dibromomethane Other |
0.035 ppb | — | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.529 ppm | — | 4.0 | 1.5 | 1.5 | — | — | 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, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from JANESVILLE WATER UTILITY.