What was found in ZIP 18104
The highest level seen across the suppliers serving this ZIP, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 8680 µg/L 87% of the EPA limit 10000 µg/L | 3/3 | SYR4 |
| Copper | 858 µg/L 66% of the EPA limit 1300 µg/L | 3/3 | SYR4 |
| Fluoride | 600 µg/L 15% of the EPA limit 4000 µg/L | 2/3 | SYR4 |
| Nitrite | 520 µg/L 52% of the EPA limit 1000 µg/L | 2/3 | SYR4 |
| TTHM | 105 µg/L 131% of the EPA limit, in the worst sample — 80 µg/L | 3/3 | SYR4 |
| Barium | 69 µg/L 3.5% of the EPA limit 2000 µg/L | 3/3 | SYR4 |
| Chloroform | 53.6 µg/L No EPA limit set | 3/3 | SYR4 |
| Lead | 47 µg/L 313% of the EPA limit, in the worst sample — 15 µg/L | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 46.3 µg/L 77% of the EPA limit 60 µg/L | 3/3 | SYR4 |
| Bromodichloromethane | 31.2 µg/L No EPA limit set | 3/3 | SYR4 |
| Dichloroacetic Acid | 25.6 µg/L No EPA limit set | 3/3 | SYR4 |
| Dibromochloromethane | 23.6 µg/L No EPA limit set | 3/3 | SYR4 |
| Trichloroacetic Acid | 21.9 µg/L No EPA limit set | 3/3 | SYR4 |
| Selenium | 4 µg/L 8% of the EPA limit 50 µg/L | 2/3 | SYR4 |
| Bromoform | 3.8 µg/L No EPA limit set | 3/3 | SYR4 |
| Chromium | 3.7 µg/L 3.7% of the EPA limit 100 µg/L | 3/3 | SYR4 |
| Tetrachloroethylene | 2.98 µg/L 60% of the EPA limit 5 µg/L | 1/3 | SYR4 |
| Dibromoacetic Acid | 2.09 µg/L No EPA limit set | 3/3 | SYR4 |
| Trichloroethylene | 1.7 µg/L 34% of the EPA limit 5 µg/L | 1/3 | SYR4 |
| 1,1,1-Trichloroethane | 1.1 µg/L 0.6% of the EPA limit 200 µg/L | 1/3 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 1.1 µg/L 18% of the EPA limit 6 µg/L | 1/3 | SYR4 |
| Combined Uranium | 1.0281 µg/L 3.4% of the EPA limit 30 µg/L | 1/3 | SYR4 |
| Cyanide | 1 µg/L 0.5% of the EPA limit 200 µg/L | 1/3 | SYR4 |
| Benzene | 0.9000 µg/L 18% of the EPA limit 5 µg/L | 1/3 | SYR4 |
| Arsenic | 0.7700 µg/L 7.7% of the EPA limit 10 µg/L | 2/3 | SYR4 |
| Dichloromethane | 0.7000 µg/L 14% of the EPA limit 5 µg/L | 1/3 | SYR4 |
| Cadmium | 0.4000 µg/L 8% of the EPA limit 5 µg/L | 1/3 | SYR4 |
| Mercury | 0.2000 µg/L 10% of the EPA limit 2 µg/L | 2/3 | SYR4 |
| Thallium, Total | 0.0300 µg/L 1.5% of the EPA limit 2 µg/L | 1/3 | SYR4 |
| Pfpea | 0.0101 µg/L No EPA limit set | 3/3 | UCMR-5 |
| Lead | 0.0070 mg/L 47% of the EPA limit 0.0150 mg/L | 3/3 | LCR |
| Pfhxa | 0.0064 µg/L No EPA limit set | 3/3 | UCMR-5 |
| PFOA | 0.0044 µg/L No EPA limit set | 2/3 | UCMR-5 |
| PFOS | 0.0044 µg/L No EPA limit set | 1/3 | UCMR-5 |
| PFBS | 0.0038 µg/L No EPA limit set | 2/3 | UCMR-5 |
| PFHXS | 0.0031 µg/L No EPA limit set | 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 single worst sample on
record — over 100% is worth reading, but is not by itself a violation.
Formal violations are listed separately.
Water suppliers serving ZIP 18104
| Supplier | State | Population served |
|---|---|---|
| LCA ALLENTOWN DIVISION | PA | 118,000 |
| LCA WLSA CENTRAL DIVISION | PA | 47,693 |
| SWT MAIN SYSTEM | PA | 14,500 |
Frequently asked questions about ZIP 18104 tap water
Is the tap water in ZIP 18104 safe to drink?
EPA testing detected 36 contaminants across the water suppliers serving ZIP 18104. 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 18104?
3 public water suppliers report EPA drinking-water monitoring for ZIP 18104. Each is listed above with its population served.
What contaminants are in ZIP 18104's water?
EPA monitoring detected Nitrate, Copper, Fluoride, Nitrite, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.