What was found in ZIP 17603
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 | 7509 µg/L 75% of the EPA limit 10000 µg/L Main supplier: CITY OF LANCASTER · 120,000 people · 2019
Highest in the ZIP: 8058.5 µg/L — EAST HEMPFIELD WATER AUTH · 20,988 people · 2019 | 3/3 | SYR4 |
| Fluoride | 735 µg/L 18% of the EPA limit 4000 µg/L Main supplier: CITY OF LANCASTER · 120,000 people · 2019
Highest in the ZIP: 1192 µg/L — EAST HEMPFIELD WATER AUTH · 20,988 people · 2018 | 3/3 | SYR4 |
| Copper | 232 µg/L 18% of the EPA limit 1300 µg/L Main supplier: CITY OF LANCASTER · 120,000 people · 2019
Highest in the ZIP: 480.7 µg/L — COLUMBIA WATER CO · 25,200 people · 2019 | 3/3 | SYR4 |
| TTHM | 103.15 µg/L 129% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: CITY OF LANCASTER · 120,000 people · 2019 | 3/3 | SYR4 |
| Chloroform | 80.515 µg/L No EPA limit set Main supplier: CITY OF LANCASTER · 120,000 people · 2019 | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 74.85 µg/L 125% of the EPA limit, at the 95th percentile of samples — 60 µg/L Main supplier: CITY OF LANCASTER · 120,000 people · 2019 | 3/3 | SYR4 |
| Barium | 50.45 µg/L 2.5% of the EPA limit 2000 µg/L Main supplier: CITY OF LANCASTER · 120,000 people · 2019 | 3/3 | SYR4 |
| Trichloroacetic Acid | 32.935 µg/L No EPA limit set Main supplier: CITY OF LANCASTER · 120,000 people · 2019 | 2/3 | SYR4 |
| Dichloroacetic Acid | 28.35 µg/L No EPA limit set Main supplier: CITY OF LANCASTER · 120,000 people · 2019 | 3/3 | SYR4 |
| Bromodichloromethane | 21.505 µg/L No EPA limit set Main supplier: CITY OF LANCASTER · 120,000 people · 2019 | 3/3 | SYR4 |
| Lead | 8.95 µg/L 60% of the EPA limit 15 µg/L Main supplier: CITY OF LANCASTER · 120,000 people · 2019
Highest in the ZIP: 14 µg/L — COLUMBIA WATER CO · 25,200 people · 2019 | 3/3 | SYR4 |
| Cyanide | 9 µg/L 4.5% of the EPA limit 200 µg/L Highest in the ZIP: EAST HEMPFIELD WATER AUTH · 20,988 people · 2018 | 1/3 | SYR4 |
| Dibromochloromethane | 5.5 µg/L No EPA limit set Main supplier: CITY OF LANCASTER · 120,000 people · 2019
Highest in the ZIP: 7.285 µg/L — COLUMBIA WATER CO · 25,200 people · 2019 | 3/3 | SYR4 |
| Monochloroacetic Acid | 5 µg/L No EPA limit set Main supplier: CITY OF LANCASTER · 120,000 people · 2019
Highest in the ZIP: 5.27 µg/L — COLUMBIA WATER CO · 25,200 people · 2019 | 2/3 | SYR4 |
| Chromium | 3.45 µg/L 3.5% of the EPA limit 100 µg/L Highest in the ZIP: EAST HEMPFIELD WATER AUTH · 20,988 people · 2018 | 1/3 | SYR4 |
| Bromoform | 0.5800 µg/L No EPA limit set Main supplier: CITY OF LANCASTER · 120,000 people · 2019
Highest in the ZIP: 3.24 µg/L — EAST HEMPFIELD WATER AUTH · 20,988 people · 2019 | 3/3 | SYR4 |
| Dibromoacetic Acid | 1.47 µg/L No EPA limit set Main supplier: CITY OF LANCASTER · 120,000 people · 2019 | 2/3 | SYR4 |
| Mercury | 0.3800 µg/L 19% of the EPA limit 2 µg/L Highest in the ZIP: COLUMBIA WATER CO · 25,200 people · 2019 | 1/3 | SYR4 |
| Atrazine | 0.2874 µg/L 9.6% of the EPA limit 3 µg/L Main supplier: CITY OF LANCASTER · 120,000 people · 2019 | 1/3 | SYR4 |
| Benzo(A)Pyrene | 0.2490 µg/L 124% of the EPA limit, at the 95th percentile of samples — 0.2000 µg/L Highest in the ZIP: EAST HEMPFIELD WATER AUTH · 20,988 people · 2019 | 1/3 | SYR4 |
| Pfhxa | 0.0288 µg/L No EPA limit set Main supplier: CITY OF LANCASTER · 120,000 people · 2024 | 2/3 | UCMR-5 |
| PFOA | 0.0238 µg/L No EPA limit set Main supplier: CITY OF LANCASTER · 120,000 people · 2024 | 2/3 | UCMR-5 |
| Pfpea | 0.0223 µg/L No EPA limit set Main supplier: CITY OF LANCASTER · 120,000 people · 2024 | 2/3 | UCMR-5 |
| Pfba | 0.0154 µg/L No EPA limit set Main supplier: CITY OF LANCASTER · 120,000 people · 2024 | 1/3 | UCMR-5 |
| PFBS | 0.0098 µg/L No EPA limit set Main supplier: CITY OF LANCASTER · 120,000 people · 2024 | 2/3 | UCMR-5 |
| Pfhpa | 0.0081 µg/L No EPA limit set Main supplier: CITY OF LANCASTER · 120,000 people · 2024 | 1/3 | UCMR-5 |
| Lead | 0.0070 mg/L 47% of the EPA limit 0.0150 mg/L Main supplier: CITY OF LANCASTER · 120,000 people · 2025
Highest in the ZIP: 0.0080 mg/L — EAST HEMPFIELD WATER AUTH · 20,988 people · 2025 | 3/3 | LCR |
| PFOS | 0.0050 µg/L No EPA limit set Highest in the ZIP: EAST HEMPFIELD WATER AUTH · 20,988 people · 2025 | 1/3 | 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.
Water suppliers serving ZIP 17603
| Supplier | State | Population served |
|---|---|---|
| CITY OF LANCASTER | PA | 120,000 |
| COLUMBIA WATER CO | PA | 25,200 |
| EAST HEMPFIELD WATER AUTH | PA | 20,988 |
Frequently asked questions about ZIP 17603 tap water
Is the tap water in ZIP 17603 safe to drink?
EPA testing detected 28 contaminants across the water suppliers serving ZIP 17603. 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 17603?
3 public water suppliers report EPA drinking-water monitoring for ZIP 17603. Each is listed above with its population served.
What contaminants are in ZIP 17603's water?
EPA monitoring detected Nitrate, Fluoride, Copper, TTHM, Chloroform, and others across this ZIP's suppliers. The full list with levels and sources is above.