What was found in ZIP 51104
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 |
|---|---|---|---|
| Copper | 3800 µg/L 292% of the EPA limit, in the worst sample — 1300 µg/L | 1/1 | SYR4 |
| Nitrate | 2600 µg/L 26% of the EPA limit 10000 µg/L | 1/1 | SYR4 |
| Fluoride | 660 µg/L 17% of the EPA limit 4000 µg/L | 1/1 | SYR4 |
| Lithium | 240 µg/L No EPA limit set | 1/1 | UCMR-5 |
| Lead | 230 µg/L 1533% of the EPA limit, in the worst sample — 15 µg/L | 1/1 | SYR4 |
| TTHM | 140 µg/L 175% of the EPA limit, in the worst sample — 80 µg/L | 1/1 | SYR4 |
| Chloroform | 90 µg/L No EPA limit set | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 59 µg/L 98% of the EPA limit 60 µg/L | 1/1 | SYR4 |
| Bromodichloromethane | 35 µg/L No EPA limit set | 1/1 | SYR4 |
| Trichloroacetic Acid | 31 µg/L No EPA limit set | 1/1 | SYR4 |
| Dichloroacetic Acid | 29 µg/L No EPA limit set | 1/1 | SYR4 |
| Dibromochloromethane | 16 µg/L No EPA limit set | 1/1 | SYR4 |
| Dibromoacetic Acid | 3 µg/L No EPA limit set | 1/1 | SYR4 |
| Monochloroacetic Acid | 3 µg/L No EPA limit set | 1/1 | SYR4 |
| Toluene | 2.5 µg/L 0.3% of the EPA limit 1000 µg/L | 1/1 | SYR4 |
| Bromoform | 2.3 µg/L No EPA limit set | 1/1 | SYR4 |
| Arsenic | 2 µg/L 20% of the EPA limit 10 µg/L | 1/1 | SYR4 |
| Carbon Tetrachloride | 1 µg/L 20% of the EPA limit 5 µg/L | 1/1 | SYR4 |
| cis-1,2-Dichloroethylene | 0.9000 µg/L 1.3% of the EPA limit 70 µg/L | 1/1 | SYR4 |
| PFHXS | 0.0350 µg/L No EPA limit set | 1/1 | UCMR-5 |
| Pfhxa | 0.0330 µg/L No EPA limit set | 1/1 | UCMR-5 |
| Pfpea | 0.0220 µg/L No EPA limit set | 1/1 | UCMR-5 |
| PFBS | 0.0210 µg/L No EPA limit set | 1/1 | UCMR-5 |
| Pfpes | 0.0140 µg/L No EPA limit set | 1/1 | UCMR-5 |
| Pfba | 0.0092 µg/L No EPA limit set | 1/1 | UCMR-5 |
| PFOA | 0.0060 µg/L No EPA limit set | 1/1 | UCMR-5 |
| Pfhpa | 0.0048 µg/L No EPA limit set | 1/1 | UCMR-5 |
| PFOS | 0.0043 µg/L No EPA limit set | 1/1 | UCMR-5 |
| Lead | 0.0020 mg/L 13% of the EPA limit 0.0150 mg/L | 1/1 | 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 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 51104
| Supplier | State | Population served |
|---|---|---|
| SIOUX CITY WATER SUPPLY | IA | 85,791 |
Frequently asked questions about ZIP 51104 tap water
Is the tap water in ZIP 51104 safe to drink?
EPA testing detected 29 contaminants across the water suppliers serving ZIP 51104. 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 51104?
1 public water supplier report EPA drinking-water monitoring for ZIP 51104. Each is listed above with its population served.
What contaminants are in ZIP 51104's water?
EPA monitoring detected Copper, Nitrate, Fluoride, Lithium, Lead, and others across this ZIP's suppliers. The full list with levels and sources is above.