What was found in Warwick's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate-Nitrite | 3785 µg/L 38% of the EPA limit 10000 µg/L Main supplier: KENT COUNTY WATER AUTHORITY · 94,107 people · 2019 | 1/3 | SYR4 |
| Nitrate | 3350 µg/L 34% of the EPA limit 10000 µg/L Main supplier: KENT COUNTY WATER AUTHORITY · 94,107 people · 2017 | 1/3 | SYR4 |
| Fluoride | 725 µg/L 18% of the EPA limit 4000 µg/L Main supplier: KENT COUNTY WATER AUTHORITY · 94,107 people · 2017 | 1/3 | SYR4 |
| TTHM | 78.9 µg/L 99% of the EPA limit 80 µg/L Main supplier: KENT COUNTY WATER AUTHORITY · 94,107 people · 2019
Highest in the city: 80.1 µg/L — WARWICK-POTOWOMUT · 2,163 people · 2019 | 3/3 | SYR4 |
| Chloroform | 72.7 µg/L No EPA limit set Main supplier: KENT COUNTY WATER AUTHORITY · 94,107 people · 2019
Highest in the city: 75 µg/L — WARWICK-POTOWOMUT · 2,163 people · 2019 | 3/3 | SYR4 |
| Nitrite | 69 µg/L 6.9% of the EPA limit 1000 µg/L Main supplier: KENT COUNTY WATER AUTHORITY · 94,107 people · 2017 | 1/3 | SYR4 |
| Bromoform | 55.3 µg/L No EPA limit set Main supplier: KENT COUNTY WATER AUTHORITY · 94,107 people · 2019 | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 27.7 µg/L 46% of the EPA limit 60 µg/L Main supplier: KENT COUNTY WATER AUTHORITY · 94,107 people · 2019
Highest in the city: 28.3 µg/L — WARWICK-CITY OF · 73,289 people · 2019 | 3/3 | SYR4 |
| Copper | 28 µg/L 2.2% of the EPA limit 1300 µg/L Main supplier: KENT COUNTY WATER AUTHORITY · 94,107 people · 2019 | 3/3 | SYR4 |
| Dichloroacetic Acid | 22 µg/L No EPA limit set Main supplier: KENT COUNTY WATER AUTHORITY · 94,107 people · 2019
Highest in the city: 23 µg/L — WARWICK-POTOWOMUT · 2,163 people · 2019 | 3/3 | SYR4 |
| Lead | 12.78 µg/L 85% of the EPA limit 15 µg/L Main supplier: KENT COUNTY WATER AUTHORITY · 94,107 people · 2019
Highest in the city: 19.8 µg/L — WARWICK-CITY OF · 73,289 people · 2019 | 3/3 | SYR4 |
| Barium | 15.7 µg/L 0.8% of the EPA limit 2000 µg/L Main supplier: KENT COUNTY WATER AUTHORITY · 94,107 people · 2017 | 1/3 | SYR4 |
| Monochloroacetic Acid | 8.4 µg/L No EPA limit set Main supplier: KENT COUNTY WATER AUTHORITY · 94,107 people · 2019 | 3/3 | SYR4 |
| Bromodichloromethane | 7.69 µg/L No EPA limit set Main supplier: KENT COUNTY WATER AUTHORITY · 94,107 people · 2019 | 3/3 | SYR4 |
| Chromium | 6.3 µg/L 6.3% of the EPA limit 100 µg/L Main supplier: KENT COUNTY WATER AUTHORITY · 94,107 people · 2017 | 1/3 | SYR4 |
| Trichloroacetic Acid | 4.1 µg/L No EPA limit set Main supplier: KENT COUNTY WATER AUTHORITY · 94,107 people · 2019 | 3/3 | SYR4 |
| Dibromochloromethane | 2.97 µg/L No EPA limit set Main supplier: KENT COUNTY WATER AUTHORITY · 94,107 people · 2019
Highest in the city: 3.86 µg/L — WARWICK-POTOWOMUT · 2,163 people · 2019 | 3/3 | SYR4 |
| Monobromoacetic Acid | 2.19 µg/L No EPA limit set Main supplier: KENT COUNTY WATER AUTHORITY · 94,107 people · 2019 | 2/3 | SYR4 |
| Dibromoacetic Acid | 1.3 µg/L No EPA limit set Main supplier: KENT COUNTY WATER AUTHORITY · 94,107 people · 2019 | 3/3 | SYR4 |
| Combined Radium (-226 And -228) | 1.2 pCi/L 24% of the EPA limit 5 pCi/L Main supplier: KENT COUNTY WATER AUTHORITY · 94,107 people · 2017 | 1/3 | SYR4 |
| Cadmium | 1 µg/L 20% of the EPA limit 5 µg/L Main supplier: KENT COUNTY WATER AUTHORITY · 94,107 people · 2017 | 1/3 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 1 µg/L 17% of the EPA limit 6 µg/L Main supplier: KENT COUNTY WATER AUTHORITY · 94,107 people · 2017 | 1/3 | SYR4 |
| 6:2 Fts | 0.0084 µg/L No EPA limit set Main supplier: KENT COUNTY WATER AUTHORITY · 94,107 people · 2024 | 1/3 | UCMR-5 |
| Pfpea | 0.0083 µg/L No EPA limit set Main supplier: KENT COUNTY WATER AUTHORITY · 94,107 people · 2024 | 1/3 | UCMR-5 |
| PFOA | 0.0075 µg/L No EPA limit set Main supplier: KENT COUNTY WATER AUTHORITY · 94,107 people · 2024 | 1/3 | UCMR-5 |
| Pfhxa | 0.0067 µg/L No EPA limit set Main supplier: KENT COUNTY WATER AUTHORITY · 94,107 people · 2024 | 1/3 | UCMR-5 |
| PFBS | 0.0036 µg/L No EPA limit set Main supplier: KENT COUNTY WATER AUTHORITY · 94,107 people · 2024 | 1/3 | UCMR-5 |
| Pfhpa | 0.0032 µg/L No EPA limit set Main supplier: KENT COUNTY WATER AUTHORITY · 94,107 people · 2024 | 1/3 | UCMR-5 |
| Lead | 0.0014 mg/L 9.3% of the EPA limit 0.0150 mg/L Main supplier: KENT COUNTY WATER AUTHORITY · 94,107 people · 2025
Highest in the city: 0.0019 mg/L — WARWICK-CITY OF · 73,289 people · 2025 | 3/3 | LCR |
Each bar shows the measured level as a share of the EPA limit: green is
well under, amber is close to it, red is over. For lead and copper the
limit applies to exactly the 90th-percentile figure shown, so red there
means a real exceedance. For everything else the limit applies to a
running annual average while the figure is the 95th percentile of the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Warwick
| Supplier | Population served |
|---|---|
| KENT COUNTY WATER AUTHORITY | 94,107 |
| WARWICK-CITY OF | 73,289 |
| WARWICK-POTOWOMUT | 2,163 |
Frequently asked questions about Warwick tap water
Is Warwick tap water safe to drink?
EPA testing detected 29 contaminants in the water serving Warwick. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Warwick?
3 public water suppliers report drinking-water monitoring for Warwick, Rhode Island to the EPA. Each is listed above with its population served.
What contaminants are in Warwick's water?
The contaminants EPA monitoring detected in Warwick include Nitrate-Nitrite, Nitrate, Fluoride, TTHM, Chloroform. The full list, with the level at the main supplier and the data source, is in the table above.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.