What was found in ZIP 51104
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 | 2600 µg/L 26% of the EPA limit 10000 µg/L Main supplier: SIOUX CITY WATER SUPPLY · 85,791 people · 2019 | 1/1 | SYR4 |
| Copper | 1200 µg/L 92% of the EPA limit 1300 µg/L Main supplier: SIOUX CITY WATER SUPPLY · 85,791 people · 2019 | 1/1 | SYR4 |
| Fluoride | 660 µg/L 17% of the EPA limit 4000 µg/L Main supplier: SIOUX CITY WATER SUPPLY · 85,791 people · 2014 | 1/1 | SYR4 |
| Lithium | 240 µg/L No EPA limit set Main supplier: SIOUX CITY WATER SUPPLY · 85,791 people · 2024 | 1/1 | UCMR-5 |
| TTHM | 98.95 µg/L 124% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: SIOUX CITY WATER SUPPLY · 85,791 people · 2019 | 1/1 | SYR4 |
| Chloroform | 63.95 µg/L No EPA limit set Main supplier: SIOUX CITY WATER SUPPLY · 85,791 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 43 µg/L 72% of the EPA limit 60 µg/L Main supplier: SIOUX CITY WATER SUPPLY · 85,791 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 27 µg/L No EPA limit set Main supplier: SIOUX CITY WATER SUPPLY · 85,791 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 21 µg/L No EPA limit set Main supplier: SIOUX CITY WATER SUPPLY · 85,791 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 19 µg/L No EPA limit set Main supplier: SIOUX CITY WATER SUPPLY · 85,791 people · 2019 | 1/1 | SYR4 |
| Lead | 12.95 µg/L 86% of the EPA limit 15 µg/L Main supplier: SIOUX CITY WATER SUPPLY · 85,791 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 12 µg/L No EPA limit set Main supplier: SIOUX CITY WATER SUPPLY · 85,791 people · 2019 | 1/1 | SYR4 |
| Dibromoacetic Acid | 3 µg/L No EPA limit set Main supplier: SIOUX CITY WATER SUPPLY · 85,791 people · 2019 | 1/1 | SYR4 |
| Monochloroacetic Acid | 3 µg/L No EPA limit set Main supplier: SIOUX CITY WATER SUPPLY · 85,791 people · 2019 | 1/1 | SYR4 |
| Toluene | 2.43 µg/L 0.2% of the EPA limit 1000 µg/L Main supplier: SIOUX CITY WATER SUPPLY · 85,791 people · 2018 | 1/1 | SYR4 |
| Arsenic | 2 µg/L 20% of the EPA limit 10 µg/L Main supplier: SIOUX CITY WATER SUPPLY · 85,791 people · 2017 | 1/1 | SYR4 |
| Bromoform | 1.615 µg/L No EPA limit set Main supplier: SIOUX CITY WATER SUPPLY · 85,791 people · 2019 | 1/1 | SYR4 |
| Carbon Tetrachloride | 1 µg/L 20% of the EPA limit 5 µg/L Main supplier: SIOUX CITY WATER SUPPLY · 85,791 people · 2018 | 1/1 | SYR4 |
| cis-1,2-Dichloroethylene | 0.8300 µg/L 1.2% of the EPA limit 70 µg/L Main supplier: SIOUX CITY WATER SUPPLY · 85,791 people · 2019 | 1/1 | SYR4 |
| PFHXS | 0.0350 µg/L No EPA limit set Main supplier: SIOUX CITY WATER SUPPLY · 85,791 people · 2024 | 1/1 | UCMR-5 |
| Pfhxa | 0.0330 µg/L No EPA limit set Main supplier: SIOUX CITY WATER SUPPLY · 85,791 people · 2024 | 1/1 | UCMR-5 |
| Pfpea | 0.0220 µg/L No EPA limit set Main supplier: SIOUX CITY WATER SUPPLY · 85,791 people · 2024 | 1/1 | UCMR-5 |
| PFBS | 0.0210 µg/L No EPA limit set Main supplier: SIOUX CITY WATER SUPPLY · 85,791 people · 2024 | 1/1 | UCMR-5 |
| Pfpes | 0.0140 µg/L No EPA limit set Main supplier: SIOUX CITY WATER SUPPLY · 85,791 people · 2024 | 1/1 | UCMR-5 |
| Pfba | 0.0092 µg/L No EPA limit set Main supplier: SIOUX CITY WATER SUPPLY · 85,791 people · 2024 | 1/1 | UCMR-5 |
| PFOA | 0.0060 µg/L No EPA limit set Main supplier: SIOUX CITY WATER SUPPLY · 85,791 people · 2024 | 1/1 | UCMR-5 |
| Pfhpa | 0.0048 µg/L No EPA limit set Main supplier: SIOUX CITY WATER SUPPLY · 85,791 people · 2024 | 1/1 | UCMR-5 |
| PFOS | 0.0043 µg/L No EPA limit set Main supplier: SIOUX CITY WATER SUPPLY · 85,791 people · 2024 | 1/1 | UCMR-5 |
| Lead | 0.0020 mg/L 13% of the EPA limit 0.0150 mg/L Main supplier: SIOUX CITY WATER SUPPLY · 85,791 people · 2025 | 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 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 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 Nitrate, Copper, Fluoride, Lithium, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.