What was found in ZIP 19355
The level at this ZIP's main supplier, the highest level anywhere in it, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 4700 µg/L 47% of the EPA limit 10000 µg/L Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2019
Highest in the ZIP: 8390 µg/L — CHESTER WATER AUTHORITY · 140,437 people · 2019 | 3/3 | SYR4 |
| Fluoride | 588 µg/L 15% of the EPA limit 4000 µg/L Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2019
Highest in the ZIP: 772.35 µg/L — CHESTER WATER AUTHORITY · 140,437 people · 2019 | 3/3 | SYR4 |
| Copper | 458 µg/L 35% of the EPA limit 1300 µg/L Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2019
Highest in the ZIP: 743.5 µg/L — AQUA PA UWCHLAN · 35,518 people · 2019 | 3/3 | SYR4 |
| Chlorite | 590 µg/L 59% of the EPA limit 1000 µg/L Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2019 | 1/3 | SYR4 |
| Barium | 183.2 µg/L 9.2% of the EPA limit 2000 µg/L Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2019 | 3/3 | SYR4 |
| TTHM | 78.56 µg/L 98% of the EPA limit 80 µg/L Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2019 | 3/3 | SYR4 |
| Chloroform | 47.3 µg/L No EPA limit set Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2019
Highest in the ZIP: 68.435 µg/L — CHESTER WATER AUTHORITY · 140,437 people · 2019 | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 55.28 µg/L 92% of the EPA limit 60 µg/L Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2019
Highest in the ZIP: 59.93 µg/L — CHESTER WATER AUTHORITY · 140,437 people · 2019 | 3/3 | SYR4 |
| Lead | 15.1 µg/L 101% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2019
Highest in the ZIP: 48 µg/L — AQUA PA UWCHLAN · 35,518 people · 2019 | 3/3 | SYR4 |
| Dichloroacetic Acid | 22.8 µg/L No EPA limit set Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2019
Highest in the ZIP: 31.425 µg/L — CHESTER WATER AUTHORITY · 140,437 people · 2019 | 3/3 | SYR4 |
| Trichloroacetic Acid | 25.71 µg/L No EPA limit set Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2019
Highest in the ZIP: 27.06 µg/L — CHESTER WATER AUTHORITY · 140,437 people · 2019 | 3/3 | SYR4 |
| Nitrite | 20 µg/L 2% of the EPA limit 1000 µg/L Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2019 | 1/3 | SYR4 |
| Bromodichloromethane | 17.5 µg/L No EPA limit set Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2019
Highest in the ZIP: 19.26 µg/L — AQUA PA UWCHLAN · 35,518 people · 2019 | 3/3 | SYR4 |
| Lithium | 15.7 µg/L No EPA limit set Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2024 | 1/3 | UCMR-5 |
| Combined Uranium | 12.9779 µg/L 43% of the EPA limit 30 µg/L Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2017 | 1/3 | SYR4 |
| Chromium | 8.46 µg/L 8.5% of the EPA limit 100 µg/L Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2019 | 2/3 | SYR4 |
| Monochloroacetic Acid | 3.595 µg/L No EPA limit set Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2019
Highest in the ZIP: 8.38 µg/L — AQUA PA UWCHLAN · 35,518 people · 2019 | 3/3 | SYR4 |
| Dibromochloromethane | 6.105 µg/L No EPA limit set Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2019
Highest in the ZIP: 6.26 µg/L — AQUA PA UWCHLAN · 35,518 people · 2019 | 3/3 | SYR4 |
| Tetrachloroethylene | 3.3 µg/L 66% of the EPA limit 5 µg/L Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2019 | 1/3 | SYR4 |
| Xylenes, Total | 2.795 µg/L 0% of the EPA limit 10000 µg/L Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2019 | 1/3 | SYR4 |
| Monobromoacetic Acid | 1.71 µg/L No EPA limit set Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2019
Highest in the ZIP: 2.54 µg/L — CHESTER WATER AUTHORITY · 140,437 people · 2019 | 3/3 | SYR4 |
| Selenium | 2.315 µg/L 4.6% of the EPA limit 50 µg/L Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2019 | 2/3 | SYR4 |
| Trichloroethylene | 2.225 µg/L 45% of the EPA limit 5 µg/L Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2019 | 1/3 | SYR4 |
| Dibromoacetic Acid | 2.2 µg/L No EPA limit set Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2019 | 3/3 | SYR4 |
| 2,4-D | 1.5 µg/L 2.1% of the EPA limit 70 µg/L Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2019 | 2/3 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 1.474 µg/L 25% of the EPA limit 6 µg/L Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2019 | 1/3 | SYR4 |
| Arsenic | 1.3 µg/L 13% of the EPA limit 10 µg/L Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2019 | 1/3 | SYR4 |
| Bromoform | 1.075 µg/L No EPA limit set Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2019 | 2/3 | SYR4 |
| cis-1,2-Dichloroethylene | 0.9850 µg/L 1.4% of the EPA limit 70 µg/L Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2019 | 1/3 | SYR4 |
| Toluene | 0.7000 µg/L 0.1% of the EPA limit 1000 µg/L Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2019 | 1/3 | SYR4 |
| Atrazine | 0.2800 µg/L 9.3% of the EPA limit 3 µg/L Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2019
Highest in the ZIP: 0.6760 µg/L — CHESTER WATER AUTHORITY · 140,437 people · 2019 | 2/3 | SYR4 |
| 1,1-Dichloroethylene | 0.6000 µg/L 8.6% of the EPA limit 7 µg/L Highest in the ZIP: AQUA PA UWCHLAN · 35,518 people · 2019 | 1/3 | SYR4 |
| 1,1,1-Trichloroethane | 0.5000 µg/L 0.3% of the EPA limit 200 µg/L Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2019 | 1/3 | SYR4 |
| Pfpea | 0.0218 µg/L No EPA limit set Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2024 | 3/3 | UCMR-5 |
| Pfhxa | 0.0172 µg/L No EPA limit set Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2024 | 3/3 | UCMR-5 |
| PFOA | 0.0126 µg/L No EPA limit set Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2024 | 3/3 | UCMR-5 |
| PFNA | 0.0120 µg/L No EPA limit set Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2024 | 1/3 | UCMR-5 |
| Pfba | 0.0101 µg/L No EPA limit set Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2024 | 2/3 | UCMR-5 |
| PFBS | 0.0095 µg/L No EPA limit set Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2024 | 3/3 | UCMR-5 |
| PFOS | 0.0092 µg/L No EPA limit set Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2024 | 2/3 | UCMR-5 |
| PFHXS | 0.0077 µg/L No EPA limit set Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2024 | 1/3 | UCMR-5 |
| Pfhpa | 0.0069 µg/L No EPA limit set Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2024 | 1/3 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: AQUA PA MAIN SYSTEM · 822,600 people · 2025
Highest in the ZIP: 0.0048 mg/L — CHESTER WATER AUTHORITY · 140,437 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.
Water suppliers serving ZIP 19355
| Supplier | State | Population served |
|---|---|---|
| AQUA PA MAIN SYSTEM | PA | 822,600 |
| CHESTER WATER AUTHORITY | PA | 140,437 |
| AQUA PA UWCHLAN | PA | 35,518 |
Frequently asked questions about ZIP 19355 tap water
Is the tap water in ZIP 19355 safe to drink?
EPA testing detected 43 contaminants across the water suppliers serving ZIP 19355. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and your utility's annual Consumer Confidence Report for the official status.
Which water suppliers serve ZIP 19355?
3 public water suppliers report EPA drinking-water monitoring for ZIP 19355. Each is listed above with its population served.
What contaminants are in ZIP 19355's water?
EPA monitoring detected Nitrate, Fluoride, Copper, Chlorite, Barium, and others across this ZIP's suppliers. The full list with levels and sources is above.