Tap Water Quality Report
Tap water quality in Plymouth, Minnesota
Tap water in Plymouth, Minnesota receives a grade of D (63/100) from TapWaterSafety.org. It's served by Plymouth. The most significant water quality concerns are: PFAS contamination; Perfluorohexane sulfonate (PFHXS) significantly above health guideline; Haloacetic acids (HAA9) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in Plymouth's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving Plymouth.
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 1.35 ppt, 1348x above the EWG health guideline of 0.001 ppt.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 27.9 ppb, 466x above the EWG health guideline of 0.06 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 30.7 ppb, 205x above the EWG health guideline of 0.15 ppb.
EPA compliance record
Official U.S. EPA records for Plymouth (system ID MN1270044) 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 Plymouth
Filters matched to the specific contaminants in Plymouth'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. 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.
All contaminants detected in Plymouth'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 |
1.35 ppt | 0.001 | 10.0 | — | — | — | — | 1348× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
27.9 ppb | 0.06 | — | — | — | — | — | 466× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
30.7 ppb | 0.15 | 80.0 | 100 | — | — | — | 205× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
16.8 ppb | 0.1 | 60.0 | 60 | — | — | — | 168× over |
| Bromodichloromethane Disinfection byproduct |
8.02 ppb | 0.06 | — | — | — | — | — | 134× over |
| Trichloroacetic acid Disinfection byproduct |
8.37 ppb | 0.1 | — | — | — | — | — | 84× over |
| Chloroform Disinfection byproduct |
20.0 ppb | 0.4 | — | — | — | — | — | 50× over |
| Dichloroacetic acid Disinfection byproduct |
8.2 ppb | 0.2 | — | — | — | — | — | 41× over |
| Radium, combined (-226 and -228) Radiological |
2.05 pCi/L | 0.05 | 5.0 | — | — | — | — | 41× over |
| Dibromochloromethane Disinfection byproduct |
2.7 ppb | 0.1 | — | — | — | — | — | 27× over |
| Perfluorooctanoic acid (PFOA) PFAS |
0.705 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | 7.8× over |
| Dibromoacetic acid Disinfection byproduct |
0.183 ppb | 0.03 | — | — | — | — | — | 6.1× over |
| Chromium (hexavalent) Heavy metal |
0.06 ppb | 0.02 | — | — | — | — | — | 3.0× over |
| Perfluorooctane sulfonate (PFOS) PFAS |
0.692 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | 2.3× over |
| Chlorate Disinfection byproduct |
206.5 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
143.5 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Perfluoropentane sulfonic acid (PFPeS) PFAS |
0.145 ppt | 1.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
5.83 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Molybdenum Other |
1.78 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Perfluorobutanoic Acid (PFBA) PFAS |
9.42 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
0.351 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
0.323 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
0.437 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.251 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Perfluoroheptanoic acid (PFHPA) PFAS |
0.098 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.619 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Lithium Other |
6.7 ppb | — | — | — | — | — | — | 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 Plymouth.