What was found in Bryn Mawr'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 | 4800 µg/L 48% of the EPA limit 10000 µg/L Main supplier: AQUA PA WEST CHESTER · 48,600 people · 2019
Highest in the city: 6300 µg/L — AQUA PA HONEYBROOK · 1,600 people · 2019 | 5/7 | SYR4 |
| Copper | 270 µg/L 21% of the EPA limit 1300 µg/L Main supplier: AQUA PA WEST CHESTER · 48,600 people · 2019
Highest in the city: 1000 µg/L — AQUA PA SPRING RUN · 8,151 people · 2019 | 6/7 | SYR4 |
| Fluoride | 532 µg/L 13% of the EPA limit 4000 µg/L Main supplier: AQUA PA WEST CHESTER · 48,600 people · 2019
Highest in the city: 797 µg/L — AQUA PA FRIENDSHIP · 8,800 people · 2018 | 3/7 | SYR4 |
| Barium | 304.4 µg/L 15% of the EPA limit 2000 µg/L Main supplier: AQUA PA WEST CHESTER · 48,600 people · 2019 | 6/7 | SYR4 |
| TTHM | 81.985 µg/L 102% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: AQUA PA WEST CHESTER · 48,600 people · 2019 | 6/7 | SYR4 |
| Lead | 70.1 µg/L 467% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: AQUA PA WEST CHESTER · 48,600 people · 2019 | 5/7 | SYR4 |
| Total Haloacetic Acids (HAA5) | 62.8 µg/L 105% of the EPA limit, at the 95th percentile of samples — 60 µg/L Main supplier: AQUA PA WEST CHESTER · 48,600 people · 2019 | 6/7 | SYR4 |
| Chloroform | 46.13 µg/L No EPA limit set Main supplier: AQUA PA WEST CHESTER · 48,600 people · 2019
Highest in the city: 49.3 µg/L — AQUA PA SPRING RUN · 8,151 people · 2019 | 6/7 | SYR4 |
| Dichloroacetic Acid | 27.74 µg/L No EPA limit set Main supplier: AQUA PA WEST CHESTER · 48,600 people · 2019
Highest in the city: 33.49 µg/L — AQUA PA SPRING RUN · 8,151 people · 2019 | 6/7 | SYR4 |
| Trichloroacetic Acid | 23.04 µg/L No EPA limit set Main supplier: AQUA PA WEST CHESTER · 48,600 people · 2019
Highest in the city: 25.86 µg/L — AQUA PA SPRING RUN · 8,151 people · 2019 | 6/7 | SYR4 |
| Bromodichloromethane | 15.14 µg/L No EPA limit set Main supplier: AQUA PA WEST CHESTER · 48,600 people · 2019
Highest in the city: 19.26 µg/L — AQUA PA UWCHLAN · 35,518 people · 2019 | 6/7 | SYR4 |
| Monochloroacetic Acid | 5.84 µg/L No EPA limit set Main supplier: AQUA PA WEST CHESTER · 48,600 people · 2019
Highest in the city: 8.38 µg/L — AQUA PA UWCHLAN · 35,518 people · 2019 | 4/7 | SYR4 |
| Dibromochloromethane | 5.5 µg/L No EPA limit set Main supplier: AQUA PA WEST CHESTER · 48,600 people · 2019
Highest in the city: 7.425 µg/L — AQUA PA FRIENDSHIP · 8,800 people · 2019 | 6/7 | SYR4 |
| Chromium | 6.42 µg/L 6.4% of the EPA limit 100 µg/L Main supplier: AQUA PA WEST CHESTER · 48,600 people · 2019 | 6/7 | SYR4 |
| Bromoform | 3.41 µg/L No EPA limit set Main supplier: AQUA PA WEST CHESTER · 48,600 people · 2019
Highest in the city: 4.715 µg/L — AQUA PA SPRING RUN · 8,151 people · 2019 | 4/7 | SYR4 |
| Dibromoacetic Acid | 2.55 µg/L No EPA limit set Main supplier: AQUA PA WEST CHESTER · 48,600 people · 2019 | 5/7 | SYR4 |
| Combined Uranium | 2.35599 µg/L 7.9% of the EPA limit 30 µg/L Highest in the city: AQUA PA FRIENDSHIP · 8,800 people · 2018 | 1/7 | SYR4 |
| Selenium | 1.185 µg/L 2.4% of the EPA limit 50 µg/L Main supplier: AQUA PA WEST CHESTER · 48,600 people · 2019
Highest in the city: 2.16 µg/L — AQUA PA SPRING RUN · 8,151 people · 2018 | 5/7 | SYR4 |
| Toluene | 1.8 µg/L 0.2% of the EPA limit 1000 µg/L Highest in the city: AQUA PA FRIENDSHIP · 8,800 people · 2019 | 1/7 | SYR4 |
| Monobromoacetic Acid | 1.43 µg/L No EPA limit set Main supplier: AQUA PA WEST CHESTER · 48,600 people · 2019 | 3/7 | SYR4 |
| Xylenes, Total | 0.7000 µg/L 0% of the EPA limit 10000 µg/L Main supplier: AQUA PA WEST CHESTER · 48,600 people · 2019 | 1/7 | SYR4 |
| 1,1-Dichloroethylene | 0.6000 µg/L 8.6% of the EPA limit 7 µg/L Highest in the city: AQUA PA UWCHLAN · 35,518 people · 2019 | 1/7 | SYR4 |
| PFOS | 0.0095 µg/L No EPA limit set Highest in the city: AQUA PA FRIENDSHIP · 8,800 people · 2024 | 3/7 | UCMR-5 |
| PFOA | 0.0059 µg/L No EPA limit set Main supplier: AQUA PA WEST CHESTER · 48,600 people · 2024
Highest in the city: 0.0093 µg/L — AQUA PA UWCHLAN · 35,518 people · 2024 | 4/7 | UCMR-5 |
| PFBS | 0.0036 µg/L No EPA limit set Main supplier: AQUA PA WEST CHESTER · 48,600 people · 2024
Highest in the city: 0.0085 µg/L — AQUA PA FRIENDSHIP · 8,800 people · 2024 | 4/7 | UCMR-5 |
| Pfpea | 0.0074 µg/L No EPA limit set Main supplier: AQUA PA WEST CHESTER · 48,600 people · 2024
Highest in the city: 0.0080 µg/L — AQUA PA SPRING RUN · 8,151 people · 2024 | 4/7 | UCMR-5 |
| Pfhxa | 0.0072 µg/L No EPA limit set Main supplier: AQUA PA WEST CHESTER · 48,600 people · 2024 | 4/7 | UCMR-5 |
| Pfba | 0.0057 µg/L No EPA limit set Main supplier: AQUA PA WEST CHESTER · 48,600 people · 2024
Highest in the city: 0.0063 µg/L — AQUA PA SPRING RUN · 8,151 people · 2024 | 4/7 | UCMR-5 |
| PFNA | 0.0052 µg/L No EPA limit set Highest in the city: AQUA PA SPRING RUN · 8,151 people · 2024 | 1/7 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: AQUA PA WEST CHESTER · 48,600 people · 2025
Highest in the city: 0.0050 mg/L — AQUA PA HONEYBROOK · 1,600 people · 1996 | 6/7 | LCR |
| Pfhpa | 0.0042 µg/L No EPA limit set Highest in the city: AQUA PA SPRING RUN · 8,151 people · 2024 | 2/7 | UCMR-5 |
| PFHXS | 0.0036 µg/L No EPA limit set Highest in the city: AQUA PA SPRING RUN · 8,151 people · 2024 | 2/7 | 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 Bryn Mawr
| Supplier | Population served |
|---|---|
| AQUA PA WEST CHESTER | 48,600 |
| AQUA PA UWCHLAN | 35,518 |
| AQUA PA FRIENDSHIP | 8,800 |
| AQUA PA SPRING RUN | 8,151 |
| AQUA PA HONEYBROOK | 1,600 |
| AQUA PA EAST PIKELAND | 675 |
| AQUA PA FRANKLIN | 265 |
Frequently asked questions about Bryn Mawr tap water
Is Bryn Mawr tap water safe to drink?
EPA testing detected 32 contaminants in the water serving Bryn Mawr. 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 Bryn Mawr?
7 public water suppliers report drinking-water monitoring for Bryn Mawr, Pennsylvania to the EPA. Each is listed above with its population served.
What contaminants are in Bryn Mawr's water?
The contaminants EPA monitoring detected in Bryn Mawr include Nitrate, Copper, Fluoride, Barium, 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.