What was found in Norristown'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 | 3070 µg/L 31% of the EPA limit 10000 µg/L Main supplier: PA AMERICAN NORRISTOWN · 88,885 people · 2019
Highest in the city: 4600 µg/L — AWC VALLEY FORGE CROSSING MHP · 250 people · 2019 | 3/3 | SYR4 |
| Copper | 376.75 µg/L 29% of the EPA limit 1300 µg/L Main supplier: PA AMERICAN NORRISTOWN · 88,885 people · 2019
Highest in the city: 1695 µg/L — AWC VALLEY FORGE CROSSING MHP · 250 people · 2019 | 3/3 | SYR4 |
| Barium | 852.5 µg/L 43% of the EPA limit 2000 µg/L Highest in the city: PA AMERICAN AUDUBON · 8,200 people · 2018 | 2/3 | SYR4 |
| Fluoride | 119 µg/L 3% of the EPA limit 4000 µg/L Main supplier: PA AMERICAN NORRISTOWN · 88,885 people · 2019
Highest in the city: 167 µg/L — PA AMERICAN AUDUBON · 8,200 people · 2018 | 2/3 | SYR4 |
| TTHM | 78.49 µg/L 98% of the EPA limit 80 µg/L Main supplier: PA AMERICAN NORRISTOWN · 88,885 people · 2019 | 3/3 | SYR4 |
| Chloroform | 55.64 µg/L No EPA limit set Main supplier: PA AMERICAN NORRISTOWN · 88,885 people · 2019 | 3/3 | SYR4 |
| Lead | 33.2 µg/L 221% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: PA AMERICAN NORRISTOWN · 88,885 people · 2019 | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 32.8 µg/L 55% of the EPA limit 60 µg/L Main supplier: PA AMERICAN NORRISTOWN · 88,885 people · 2019 | 2/3 | SYR4 |
| Bromodichloromethane | 25.08 µg/L No EPA limit set Main supplier: PA AMERICAN NORRISTOWN · 88,885 people · 2019 | 3/3 | SYR4 |
| Lithium | 16.2 µg/L No EPA limit set Main supplier: PA AMERICAN NORRISTOWN · 88,885 people · 2024
Highest in the city: 24.5 µg/L — PA AMERICAN AUDUBON · 8,200 people · 2024 | 2/3 | UCMR-5 |
| Dibromochloromethane | 16.9 µg/L No EPA limit set Main supplier: PA AMERICAN NORRISTOWN · 88,885 people · 2019 | 3/3 | SYR4 |
| Arsenic | 11 µg/L 110% of the EPA limit, at the 95th percentile of samples — 10 µg/L Highest in the city: PA AMERICAN AUDUBON · 8,200 people · 2018 | 1/3 | SYR4 |
| Trichloroacetic Acid | 10.425 µg/L No EPA limit set Main supplier: PA AMERICAN NORRISTOWN · 88,885 people · 2019 | 2/3 | SYR4 |
| Selenium | 9.87 µg/L 20% of the EPA limit 50 µg/L Highest in the city: PA AMERICAN AUDUBON · 8,200 people · 2018 | 1/3 | SYR4 |
| Dichloroacetic Acid | 8.43 µg/L No EPA limit set Main supplier: PA AMERICAN NORRISTOWN · 88,885 people · 2019 | 2/3 | SYR4 |
| Chromium | 7.89 µg/L 7.9% of the EPA limit 100 µg/L Highest in the city: PA AMERICAN AUDUBON · 8,200 people · 2018 | 2/3 | SYR4 |
| Bromoform | 7.5 µg/L No EPA limit set Main supplier: PA AMERICAN NORRISTOWN · 88,885 people · 2019 | 2/3 | SYR4 |
| Tetrachloroethylene | 4.46 µg/L 89% of the EPA limit 5 µg/L Highest in the city: AWC VALLEY FORGE CROSSING MHP · 250 people · 2019 | 2/3 | SYR4 |
| Dibromoacetic Acid | 3.13 µg/L No EPA limit set Main supplier: PA AMERICAN NORRISTOWN · 88,885 people · 2019 | 3/3 | SYR4 |
| Carbon Tetrachloride | 0.8000 µg/L 16% of the EPA limit 5 µg/L Main supplier: PA AMERICAN NORRISTOWN · 88,885 people · 2019
Highest in the city: 3.05 µg/L — PA AMERICAN AUDUBON · 8,200 people · 2019 | 2/3 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 2.985 µg/L 50% of the EPA limit 6 µg/L Main supplier: PA AMERICAN NORRISTOWN · 88,885 people · 2019 | 1/3 | SYR4 |
| Atrazine | 0.1900 µg/L 6.3% of the EPA limit 3 µg/L Main supplier: PA AMERICAN NORRISTOWN · 88,885 people · 2019 | 1/3 | SYR4 |
| PFOS | 0.0579 µg/L No EPA limit set Highest in the city: PA AMERICAN AUDUBON · 8,200 people · 2024 | 1/3 | UCMR-5 |
| PFOA | 0.0308 µg/L No EPA limit set Highest in the city: PA AMERICAN AUDUBON · 8,200 people · 2024 | 1/3 | UCMR-5 |
| Combined Uranium | 0.0292 µg/L 0.1% of the EPA limit 30 µg/L Highest in the city: PA AMERICAN AUDUBON · 8,200 people · 2017 | 1/3 | SYR4 |
| Pfpea | 0.0069 µg/L No EPA limit set Main supplier: PA AMERICAN NORRISTOWN · 88,885 people · 2024
Highest in the city: 0.0133 µg/L — PA AMERICAN AUDUBON · 8,200 people · 2024 | 2/3 | UCMR-5 |
| Pfhxa | 0.0050 µg/L No EPA limit set Main supplier: PA AMERICAN NORRISTOWN · 88,885 people · 2024
Highest in the city: 0.0117 µg/L — PA AMERICAN AUDUBON · 8,200 people · 2024 | 2/3 | UCMR-5 |
| Pfhpa | 0.0079 µg/L No EPA limit set Highest in the city: PA AMERICAN AUDUBON · 8,200 people · 2024 | 1/3 | UCMR-5 |
| Pfba | 0.0070 µg/L No EPA limit set Main supplier: PA AMERICAN NORRISTOWN · 88,885 people · 2024 | 2/3 | UCMR-5 |
| PFNA | 0.0066 µg/L No EPA limit set Highest in the city: PA AMERICAN AUDUBON · 8,200 people · 2024 | 1/3 | UCMR-5 |
| PFBS | 0.0053 µg/L No EPA limit set Main supplier: PA AMERICAN NORRISTOWN · 88,885 people · 2024 | 2/3 | UCMR-5 |
| PFHXS | 0.0050 µg/L No EPA limit set Highest in the city: PA AMERICAN AUDUBON · 8,200 people · 2024 | 1/3 | UCMR-5 |
| Lead | 0.0020 mg/L 13% of the EPA limit 0.0150 mg/L Main supplier: PA AMERICAN NORRISTOWN · 88,885 people · 2025
Highest in the city: 0.0040 mg/L — PA AMERICAN AUDUBON · 8,200 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 Norristown
| Supplier | Population served |
|---|---|
| PA AMERICAN NORRISTOWN | 88,885 |
| PA AMERICAN AUDUBON | 8,200 |
| AWC VALLEY FORGE CROSSING MHP | 250 |
Frequently asked questions about Norristown tap water
Is Norristown tap water safe to drink?
EPA testing detected 33 contaminants in the water serving Norristown. 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 Norristown?
3 public water suppliers report drinking-water monitoring for Norristown, Pennsylvania to the EPA. Each is listed above with its population served.
What contaminants are in Norristown's water?
The contaminants EPA monitoring detected in Norristown include Nitrate, Copper, Barium, Fluoride, 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.