What was found in ZIP 18103
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 | 4680 µg/L 47% of the EPA limit 10000 µg/L Main supplier: LCA ALLENTOWN DIVISION · 118,000 people · 2019
Highest in the ZIP: 7010 µg/L — LCA WLSA CENTRAL DIVISION · 47,693 people · 2019 | 3/5 | SYR4 |
| Fluoride | 577.5 µg/L 14% of the EPA limit 4000 µg/L Main supplier: LCA ALLENTOWN DIVISION · 118,000 people · 2019
Highest in the ZIP: 785 µg/L — CITY OF BETHLEHEM · 117,259 people · 2019 | 3/5 | SYR4 |
| Nitrite | 495.5 µg/L 50% of the EPA limit 1000 µg/L Highest in the ZIP: LCA WLSA CENTRAL DIVISION · 47,693 people · 2019 | 2/5 | SYR4 |
| Copper | 324.8 µg/L 25% of the EPA limit 1300 µg/L Main supplier: LCA ALLENTOWN DIVISION · 118,000 people · 2019 | 5/5 | SYR4 |
| Barium | 38 µg/L 1.9% of the EPA limit 2000 µg/L Main supplier: LCA ALLENTOWN DIVISION · 118,000 people · 2019
Highest in the ZIP: 64 µg/L — SWT MAIN SYSTEM · 14,500 people · 2018 | 3/5 | SYR4 |
| TTHM | 49.45 µg/L 62% of the EPA limit 80 µg/L Main supplier: LCA ALLENTOWN DIVISION · 118,000 people · 2019
Highest in the ZIP: 59.5 µg/L — LCA WLSA CENTRAL DIVISION · 47,693 people · 2019 | 5/5 | SYR4 |
| Chloroform | 25.8 µg/L No EPA limit set Main supplier: LCA ALLENTOWN DIVISION · 118,000 people · 2019
Highest in the ZIP: 50.97 µg/L — CITY OF BETHLEHEM · 117,259 people · 2019 | 5/5 | SYR4 |
| Total Haloacetic Acids (HAA5) | 25 µg/L 42% of the EPA limit 60 µg/L Main supplier: LCA ALLENTOWN DIVISION · 118,000 people · 2019
Highest in the ZIP: 47.55 µg/L — CITY OF BETHLEHEM · 117,259 people · 2019 | 5/5 | SYR4 |
| Lead | 11.16 µg/L 74% of the EPA limit 15 µg/L Main supplier: LCA ALLENTOWN DIVISION · 118,000 people · 2019
Highest in the ZIP: 43.2 µg/L — CITY OF BETHLEHEM · 117,259 people · 2019 | 5/5 | SYR4 |
| Dichloroacetic Acid | 10.955 µg/L No EPA limit set Main supplier: LCA ALLENTOWN DIVISION · 118,000 people · 2019
Highest in the ZIP: 21 µg/L — CITY OF BETHLEHEM · 117,259 people · 2019 | 5/5 | SYR4 |
| Trichloroacetic Acid | 13.035 µg/L No EPA limit set Main supplier: LCA ALLENTOWN DIVISION · 118,000 people · 2019
Highest in the ZIP: 20.665 µg/L — LCA WLSA CENTRAL DIVISION · 47,693 people · 2019 | 5/5 | SYR4 |
| Bromodichloromethane | 15.575 µg/L No EPA limit set Main supplier: LCA ALLENTOWN DIVISION · 118,000 people · 2019
Highest in the ZIP: 17.905 µg/L — LCA WLSA CENTRAL DIVISION · 47,693 people · 2019 | 5/5 | SYR4 |
| Dibromochloromethane | 10.45 µg/L No EPA limit set Main supplier: LCA ALLENTOWN DIVISION · 118,000 people · 2019 | 5/5 | SYR4 |
| Monochloroacetic Acid | 9 µg/L No EPA limit set Highest in the ZIP: CITY OF BETHLEHEM · 117,259 people · 2019 | 1/5 | SYR4 |
| Selenium | 3.91 µg/L 7.8% of the EPA limit 50 µg/L Main supplier: LCA ALLENTOWN DIVISION · 118,000 people · 2019 | 2/5 | SYR4 |
| Chromium | 3.63 µg/L 3.6% of the EPA limit 100 µg/L Main supplier: LCA ALLENTOWN DIVISION · 118,000 people · 2019 | 3/5 | SYR4 |
| Dibromoacetic Acid | 1.914 µg/L No EPA limit set Main supplier: LCA ALLENTOWN DIVISION · 118,000 people · 2019
Highest in the ZIP: 3 µg/L — SALISBURY TWP WATER SYSTEM · 8,522 people · 2019 | 4/5 | SYR4 |
| Tetrachloroethylene | 2.8675 µg/L 57% of the EPA limit 5 µg/L Main supplier: LCA ALLENTOWN DIVISION · 118,000 people · 2019 | 1/5 | SYR4 |
| Bromoform | 2.8075 µg/L No EPA limit set Main supplier: LCA ALLENTOWN DIVISION · 118,000 people · 2019 | 4/5 | SYR4 |
| Trichloroethylene | 1.63 µg/L 33% of the EPA limit 5 µg/L Highest in the ZIP: LCA WLSA CENTRAL DIVISION · 47,693 people · 2019 | 1/5 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 1.1 µg/L 18% of the EPA limit 6 µg/L Highest in the ZIP: SWT MAIN SYSTEM · 14,500 people · 2019 | 1/5 | SYR4 |
| 1,1,1-Trichloroethane | 1.04 µg/L 0.5% of the EPA limit 200 µg/L Highest in the ZIP: SWT MAIN SYSTEM · 14,500 people · 2019 | 1/5 | SYR4 |
| Combined Uranium | 1.0281 µg/L 3.4% of the EPA limit 30 µg/L Highest in the ZIP: SWT MAIN SYSTEM · 14,500 people · 2018 | 1/5 | SYR4 |
| Cyanide | 1 µg/L 0.5% of the EPA limit 200 µg/L Highest in the ZIP: SWT MAIN SYSTEM · 14,500 people · 2018 | 1/5 | SYR4 |
| Benzene | 0.9000 µg/L 18% of the EPA limit 5 µg/L Highest in the ZIP: SWT MAIN SYSTEM · 14,500 people · 2019 | 1/5 | SYR4 |
| Arsenic | 0.7645 µg/L 7.6% of the EPA limit 10 µg/L Main supplier: LCA ALLENTOWN DIVISION · 118,000 people · 2019 | 2/5 | SYR4 |
| Dichloromethane | 0.7000 µg/L 14% of the EPA limit 5 µg/L Highest in the ZIP: LCA WLSA CENTRAL DIVISION · 47,693 people · 2019 | 1/5 | SYR4 |
| Cadmium | 0.4000 µg/L 8% of the EPA limit 5 µg/L Highest in the ZIP: LCA WLSA CENTRAL DIVISION · 47,693 people · 2019 | 1/5 | SYR4 |
| Mercury | 0.2000 µg/L 10% of the EPA limit 2 µg/L Main supplier: LCA ALLENTOWN DIVISION · 118,000 people · 2019 | 2/5 | SYR4 |
| Thallium, Total | 0.0300 µg/L 1.5% of the EPA limit 2 µg/L Highest in the ZIP: SWT MAIN SYSTEM · 14,500 people · 2018 | 1/5 | SYR4 |
| Pfpea | 0.0075 µg/L No EPA limit set Main supplier: LCA ALLENTOWN DIVISION · 118,000 people · 2023
Highest in the ZIP: 0.0101 µg/L — SWT MAIN SYSTEM · 14,500 people · 2024 | 4/5 | UCMR-5 |
| Lead | 0.0070 mg/L 47% of the EPA limit 0.0150 mg/L Main supplier: LCA ALLENTOWN DIVISION · 118,000 people · 2025 | 5/5 | LCR |
| Pfhxa | 0.0064 µg/L No EPA limit set Main supplier: LCA ALLENTOWN DIVISION · 118,000 people · 2023 | 4/5 | UCMR-5 |
| PFOA | 0.0045 µg/L No EPA limit set Highest in the ZIP: SALISBURY TWP WATER SYSTEM · 8,522 people · 2025 | 3/5 | UCMR-5 |
| PFOS | 0.0044 µg/L No EPA limit set Main supplier: LCA ALLENTOWN DIVISION · 118,000 people · 2023 | 2/5 | UCMR-5 |
| PFBS | 0.0030 µg/L No EPA limit set Main supplier: LCA ALLENTOWN DIVISION · 118,000 people · 2023
Highest in the ZIP: 0.0038 µg/L — LCA WLSA CENTRAL DIVISION · 47,693 people · 2024 | 3/5 | UCMR-5 |
| PFHXS | 0.0031 µg/L No EPA limit set Highest in the ZIP: LCA WLSA CENTRAL DIVISION · 47,693 people · 2024 | 1/5 | 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 18103
| Supplier | State | Population served |
|---|---|---|
| LCA ALLENTOWN DIVISION | PA | 118,000 |
| CITY OF BETHLEHEM | PA | 117,259 |
| LCA WLSA CENTRAL DIVISION | PA | 47,693 |
| SWT MAIN SYSTEM | PA | 14,500 |
| SALISBURY TWP WATER SYSTEM | PA | 8,522 |
Frequently asked questions about ZIP 18103 tap water
Is the tap water in ZIP 18103 safe to drink?
EPA testing detected 37 contaminants across the water suppliers serving ZIP 18103. 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 18103?
5 public water suppliers report EPA drinking-water monitoring for ZIP 18103. Each is listed above with its population served.
What contaminants are in ZIP 18103's water?
EPA monitoring detected Nitrate, Fluoride, Nitrite, Copper, Barium, and others across this ZIP's suppliers. The full list with levels and sources is above.