Tap Water Quality Report
Tap water quality in WARWICK, Rhode Island
Tap water in WARWICK, Rhode Island receives a grade of D (65/100) from TapWaterSafety.org. It's served by 2 public water systems, primarily WARWICK-CITY OF. The most significant water quality concerns are: PFAS contamination; Total trihalomethanes (TTHMs) significantly above health guideline; Haloacetic acids (HAA9) significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline; Perfluorohexane sulfonate (PFHXS) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in WARWICK's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utilities serving WARWICK.
PFAS contamination
Severe concernPerfluorooctanoic acid (PFOA) detected. PFAS are persistent chemicals linked to cancer and immune effects with no known safe exposure threshold.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 43.4 ppb, 289x above the EWG health guideline of 0.15 ppb.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 16.6 ppb, 277x above the EWG health guideline of 0.06 ppb.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 15.7 ppb, 157x above the EWG health guideline of 0.1 ppb.
Perfluorohexane sulfonate (PFHXS) significantly above health guideline
Moderate concernPerfluorohexane sulfonate (PFHXS) detected at 0.848 ppt, 848x above the EWG health guideline of 0.001 ppt.
EPA compliance record
Official U.S. EPA records for WARWICK-CITY OF (system ID RI1615627) 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.
Water systems serving WARWICK
WARWICK is served by 2 public water systems. Click any utility to see its complete grade card and treatment plant contact info.
WARWICK-CITY OF
- PFAS contamination
- Total trihalomethanes (TTHMs) significantly above health guideline
- Haloacetic acids (HAA9) significantly above health guideline
KENT COUNTY WATER AUTHORITY
- PFAS contamination
- Perfluorohexane sulfonate (PFHXS) significantly above health guideline
- Total trihalomethanes (TTHMs) significantly above health guideline
Recommended filters for WARWICK
Filters matched to the specific contaminants in WARWICK'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 WARWICK'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 |
0.848 ppt | 0.001 | 10.0 | — | — | — | — | 848× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
49.9 ppb | 0.15 | 80.0 | 100 | — | — | — | 333× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
16.6 ppb | 0.06 | — | — | — | — | — | 277× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
17.8 ppb | 0.1 | 60.0 | 60 | — | — | — | 178× over |
| Chloroform Disinfection byproduct |
39.5 ppb | 0.4 | — | — | — | — | — | 99× over |
| Dichloroacetic acid Disinfection byproduct |
14.1 ppb | 0.2 | — | — | — | — | — | 71× over |
| Bromodichloromethane Disinfection byproduct |
4.04 ppb | 0.06 | — | — | — | — | — | 67× over |
| Arsenic Heavy metal |
0.25 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 63× over |
| Perfluorooctanoic acid (PFOA) PFAS |
3.89 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | 43× over |
| Trichloroacetic acid Disinfection byproduct |
2.21 ppb | 0.1 | — | — | — | — | — | 22× over |
| Nitrate Inorganic |
1.29 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 9.2× over |
| Nitrate and nitrite Inorganic |
1.23 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 8.8× over |
| Dibromochloromethane Disinfection byproduct |
0.792 ppb | 0.1 | — | — | — | — | — | 7.9× over |
| Perfluorooctane sulfonate (PFOS) PFAS |
1.8 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | 6.0× over |
| Cadmium Heavy metal |
0.15 ppb | 0.04 | 5.0 | 5 | 3 | 0.04 | — | 3.8× over |
| Dibromoacetic acid Disinfection byproduct |
0.0804 ppb | 0.03 | — | — | — | — | — | 2.7× over |
| Radium, combined (-226 and -228) Radiological |
0.09 pCi/L | 0.05 | 5.0 | — | — | — | — | 1.8× over |
| 6:2 Fluorotelomer Sulfonic Acid (6:2 FTSA) Other |
1.4 ppt | 1.0 | — | — | — | — | — | 1.4× over |
| Chromium (hexavalent) Heavy metal |
0.016 ppb | 0.02 | — | — | — | — | — | Below guideline |
| Uranium Radiological |
0.19 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | Below guideline |
| Manganese Heavy metal |
34.5 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Chromium (hexavalent)* Heavy metal |
0.00388 ppb | 0.02 | — | — | — | — | — | Below guideline |
| Nitrate* Inorganic |
0.02 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | Below guideline |
| 1,4-Dioxane Semi-volatile organic compound |
0.0373 ppb | 0.35 | — | — | 50 | 1 | — | Below guideline |
| Perfluoropentane sulfonic acid (PFPeS) PFAS |
0.069 ppt | 1.0 | — | — | — | — | — | Below guideline |
| Beryllium Heavy metal |
0.0625 ppb | 1.0 | 4.0 | — | — | 1 | — | Below guideline |
| Chlorate Disinfection byproduct |
10.5 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
1.73 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
9.88 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Barium* Heavy metal |
8.67 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Vanadium Other |
0.205 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
4.24 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
4.2 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Molybdenum Other |
0.145 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Perfluorobutanoic Acid (PFBA) PFAS |
2.53 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| MTBE Volatile organic compound |
0.0313 ppb | 13.0 | — | — | — | — | — | Below guideline |
| 1,1-Dichloroethane Volatile organic compound |
0.00627 ppb | 3.0 | — | — | — | — | — | Below guideline |
| Perfluoroheptanoic acid (PFHPA) PFAS |
1.03 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
1.13 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.0685 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Chlorodifluoromethane Other |
0.475 ppb | — | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.179 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| 4-Androstene-3,17-dione* Other |
0.13 ppt | — | — | — | — | — | — | Below guideline |
| Fluoride* Inorganic |
0.349 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 WARWICK-CITY OF.