What was found in North Wales'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 | 3100 µg/L 31% of the EPA limit 10000 µg/L Main supplier: NWWA WARRINGTON TOWNSHIP · 21,588 people · 2019
Highest in the city: 8180 µg/L — NWWA DURHAM VILLAGE · 160 people · 2019 | 6/6 | SYR4 |
| Copper | 507.4 µg/L 39% of the EPA limit 1300 µg/L Main supplier: NWWA WARRINGTON TOWNSHIP · 21,588 people · 2019
Highest in the city: 1508.3 µg/L — NWWA OLDE COLONIAL GREENE · 900 people · 2019 | 6/6 | SYR4 |
| Barium | 415 µg/L 21% of the EPA limit 2000 µg/L Main supplier: NWWA WARRINGTON TOWNSHIP · 21,588 people · 2015
Highest in the city: 1017.2 µg/L — NWWA YORKSHIRE MEADOWS · 90 people · 2018 | 6/6 | SYR4 |
| Nitrite | 109.5 µg/L 11% of the EPA limit 1000 µg/L Main supplier: NWWA WARRINGTON TOWNSHIP · 21,588 people · 2019 | 1/6 | SYR4 |
| TTHM | 53.64 µg/L 67% of the EPA limit 80 µg/L Main supplier: NWWA WARRINGTON TOWNSHIP · 21,588 people · 2019 | 6/6 | SYR4 |
| Combined Uranium | 46.8818 µg/L 156% of the EPA limit, at the 95th percentile of samples — 30 µg/L Main supplier: NWWA WARRINGTON TOWNSHIP · 21,588 people · 2017 | 4/6 | SYR4 |
| Chloroform | 39.69 µg/L No EPA limit set Main supplier: NWWA WARRINGTON TOWNSHIP · 21,588 people · 2019 | 6/6 | SYR4 |
| Lithium | 20.6 µg/L No EPA limit set Main supplier: NWWA WARRINGTON TOWNSHIP · 21,588 people · 2025 | 1/6 | UCMR-5 |
| Total Haloacetic Acids (HAA5) | 18.7 µg/L 31% of the EPA limit 60 µg/L Main supplier: NWWA WARRINGTON TOWNSHIP · 21,588 people · 2019 | 6/6 | SYR4 |
| Xylenes, Total | 16.905 µg/L 0.2% of the EPA limit 10000 µg/L Highest in the city: NWWA OLDE COLONIAL GREENE · 900 people · 2019 | 1/6 | SYR4 |
| Dichloroacetic Acid | 14.49 µg/L No EPA limit set Main supplier: NWWA WARRINGTON TOWNSHIP · 21,588 people · 2019 | 2/6 | SYR4 |
| Chromium | 12.4 µg/L 12% of the EPA limit 100 µg/L Main supplier: NWWA WARRINGTON TOWNSHIP · 21,588 people · 2015 | 6/6 | SYR4 |
| Bromodichloromethane | 12.29 µg/L No EPA limit set Main supplier: NWWA WARRINGTON TOWNSHIP · 21,588 people · 2019 | 6/6 | SYR4 |
| Lead | 6 µg/L 40% of the EPA limit 15 µg/L Main supplier: NWWA WARRINGTON TOWNSHIP · 21,588 people · 2019
Highest in the city: 11.58 µg/L — NWWA OLDE COLONIAL GREENE · 900 people · 2019 | 6/6 | SYR4 |
| Arsenic | 8.8 µg/L 88% of the EPA limit 10 µg/L Main supplier: NWWA WARRINGTON TOWNSHIP · 21,588 people · 2018
Highest in the city: 11.025 µg/L — NWWA YORKSHIRE MEADOWS · 90 people · 2019 | 6/6 | SYR4 |
| Dibromochloromethane | 6.404 µg/L No EPA limit set Main supplier: NWWA WARRINGTON TOWNSHIP · 21,588 people · 2019
Highest in the city: 10.5 µg/L — NWWA DURHAM VILLAGE · 160 people · 2018 | 6/6 | SYR4 |
| Trichloroacetic Acid | 9.711 µg/L No EPA limit set Main supplier: NWWA WARRINGTON TOWNSHIP · 21,588 people · 2019 | 4/6 | SYR4 |
| Bromoform | 3.0515 µg/L No EPA limit set Main supplier: NWWA WARRINGTON TOWNSHIP · 21,588 people · 2019
Highest in the city: 7.44 µg/L — NWWA DURHAM VILLAGE · 160 people · 2018 | 6/6 | SYR4 |
| Toluene | 3.76 µg/L 0.4% of the EPA limit 1000 µg/L Highest in the city: NWWA OLDE COLONIAL GREENE · 900 people · 2019 | 1/6 | SYR4 |
| Selenium | 3.27 µg/L 6.5% of the EPA limit 50 µg/L Main supplier: NWWA WARRINGTON TOWNSHIP · 21,588 people · 2015
Highest in the city: 3.445 µg/L — NWWA PINE RUN · 700 people · 2018 | 6/6 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 3.2355 µg/L 54% of the EPA limit 6 µg/L Main supplier: NWWA WARRINGTON TOWNSHIP · 21,588 people · 2019 | 2/6 | SYR4 |
| Ethylbenzene | 2.9 µg/L 0.4% of the EPA limit 700 µg/L Highest in the city: NWWA OLDE COLONIAL GREENE · 900 people · 2019 | 1/6 | SYR4 |
| Dibromoacetic Acid | 2.12 µg/L No EPA limit set Highest in the city: NWWA YORKSHIRE MEADOWS · 90 people · 2019 | 2/6 | SYR4 |
| Antimony, Total | 2 µg/L 33% of the EPA limit 6 µg/L Highest in the city: NWWA HERMITAGE · 75 people · 2018 | 2/6 | SYR4 |
| Tetrachloroethylene | 0.8720 µg/L 17% of the EPA limit 5 µg/L Main supplier: NWWA WARRINGTON TOWNSHIP · 21,588 people · 2019 | 1/6 | SYR4 |
| 1,1-Dichloroethylene | 0.3200 µg/L 4.6% of the EPA limit 7 µg/L Main supplier: NWWA WARRINGTON TOWNSHIP · 21,588 people · 2019 | 1/6 | SYR4 |
| cis-1,2-Dichloroethylene | 0.1300 µg/L 0.2% of the EPA limit 70 µg/L Main supplier: NWWA WARRINGTON TOWNSHIP · 21,588 people · 2019 | 1/6 | SYR4 |
| Benzo(A)Pyrene | 0.1200 µg/L 60% of the EPA limit 0.2000 µg/L Highest in the city: NWWA PINE RUN · 700 people · 2019 | 1/6 | SYR4 |
| Carbon Tetrachloride | 0.1100 µg/L 2.2% of the EPA limit 5 µg/L Main supplier: NWWA WARRINGTON TOWNSHIP · 21,588 people · 2019 | 1/6 | SYR4 |
| Heptachlor | 0.1100 µg/L 27% of the EPA limit 0.4000 µg/L Main supplier: NWWA WARRINGTON TOWNSHIP · 21,588 people · 2019 | 1/6 | SYR4 |
| Thallium, Total | 0.0700 µg/L 3.5% of the EPA limit 2 µg/L Highest in the city: NWWA YORKSHIRE MEADOWS · 90 people · 2018 | 1/6 | SYR4 |
| Mercury | 0.0257 µg/L 1.3% of the EPA limit 2 µg/L Main supplier: NWWA WARRINGTON TOWNSHIP · 21,588 people · 2015
Highest in the city: 0.0430 µg/L — NWWA DURHAM VILLAGE · 160 people · 2018 | 2/6 | SYR4 |
| Lead | 0.00060 mg/L 4% of the EPA limit 0.0150 mg/L Main supplier: NWWA WARRINGTON TOWNSHIP · 21,588 people · 2025
Highest in the city: 0.0302 mg/L — NWWA DURHAM VILLAGE · 160 people · 2007 | 6/6 | LCR |
| Pfba | 0.0070 µg/L No EPA limit set Main supplier: NWWA WARRINGTON TOWNSHIP · 21,588 people · 2025 | 1/6 | UCMR-5 |
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 North Wales
| Supplier | Population served |
|---|---|
| NWWA WARRINGTON TOWNSHIP | 21,588 |
| NWWA OLDE COLONIAL GREENE | 900 |
| NWWA PINE RUN | 700 |
| NWWA DURHAM VILLAGE | 160 |
| NWWA YORKSHIRE MEADOWS | 90 |
| NWWA HERMITAGE | 75 |
Frequently asked questions about North Wales tap water
Is North Wales tap water safe to drink?
EPA testing detected 34 contaminants in the water serving North Wales. 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 North Wales?
6 public water suppliers report drinking-water monitoring for North Wales, Pennsylvania to the EPA. Each is listed above with its population served.
What contaminants are in North Wales's water?
The contaminants EPA monitoring detected in North Wales include Nitrate, Copper, Barium, Nitrite, TTHM. 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.