What was found in ZIP 51355
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 |
|---|---|---|---|
| Copper | 570 µg/L 44% of the EPA limit 1300 µg/L Main supplier: IOWA LAKES REGIONAL WATER - OSGOOD · 9,021 people · 2017 | 3/3 | SYR4 |
| Fluoride | 533.5 µg/L 13% of the EPA limit 4000 µg/L Highest in the ZIP: OSCEOLA RURAL WATER SYSTEM-NORTH · 7,002 people · 2016 | 1/3 | SYR4 |
| Nitrate | 270 µg/L 2.7% of the EPA limit 10000 µg/L Highest in the ZIP: OSCEOLA RURAL WATER SYSTEM-NORTH · 7,002 people · 2019 | 1/3 | SYR4 |
| TTHM | 86.95 µg/L 109% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: IOWA LAKES REGIONAL WATER - OSGOOD · 9,021 people · 2019 | 3/3 | SYR4 |
| Barium | 83.66 µg/L 4.2% of the EPA limit 2000 µg/L Highest in the ZIP: OSCEOLA RURAL WATER SYSTEM-NORTH · 7,002 people · 2016 | 1/3 | SYR4 |
| Chloroform | 50.7 µg/L No EPA limit set Main supplier: IOWA LAKES REGIONAL WATER - OSGOOD · 9,021 people · 2019
Highest in the ZIP: 61 µg/L — OKOBOJI WATER SUPPLY · 776 people · 2019 | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 32.86 µg/L 55% of the EPA limit 60 µg/L Main supplier: IOWA LAKES REGIONAL WATER - OSGOOD · 9,021 people · 2019
Highest in the ZIP: 48 µg/L — OKOBOJI WATER SUPPLY · 776 people · 2019 | 3/3 | SYR4 |
| Monochloroacetic Acid | 6.75 µg/L No EPA limit set Main supplier: IOWA LAKES REGIONAL WATER - OSGOOD · 9,021 people · 2019
Highest in the ZIP: 24.5485 µg/L — OSCEOLA RURAL WATER SYSTEM-NORTH · 7,002 people · 2019 | 3/3 | SYR4 |
| Dichloroacetic Acid | 13 µg/L No EPA limit set Main supplier: IOWA LAKES REGIONAL WATER - OSGOOD · 9,021 people · 2019
Highest in the ZIP: 24.45 µg/L — OKOBOJI WATER SUPPLY · 776 people · 2019 | 3/3 | SYR4 |
| Trichloroacetic Acid | 13 µg/L No EPA limit set Main supplier: IOWA LAKES REGIONAL WATER - OSGOOD · 9,021 people · 2019
Highest in the ZIP: 24 µg/L — OKOBOJI WATER SUPPLY · 776 people · 2019 | 3/3 | SYR4 |
| Lithium | 16 µg/L No EPA limit set Main supplier: IOWA LAKES REGIONAL WATER - OSGOOD · 9,021 people · 2023
Highest in the ZIP: 23.3 µg/L — OSCEOLA RURAL WATER SYSTEM-NORTH · 7,002 people · 2023 | 3/3 | UCMR-5 |
| Xylenes, Total | 21.195 µg/L 0.2% of the EPA limit 10000 µg/L Highest in the ZIP: OSCEOLA RURAL WATER SYSTEM-NORTH · 7,002 people · 2018 | 1/3 | SYR4 |
| Bromodichloromethane | 19 µg/L No EPA limit set Main supplier: IOWA LAKES REGIONAL WATER - OSGOOD · 9,021 people · 2019 | 3/3 | SYR4 |
| Combined Uranium | 12.73 µg/L 42% of the EPA limit 30 µg/L Highest in the ZIP: OSCEOLA RURAL WATER SYSTEM-NORTH · 7,002 people · 2018 | 1/3 | SYR4 |
| Dibromochloromethane | 9.491 µg/L No EPA limit set Main supplier: IOWA LAKES REGIONAL WATER - OSGOOD · 9,021 people · 2019 | 3/3 | SYR4 |
| Lead | 4 µg/L 27% of the EPA limit 15 µg/L Main supplier: IOWA LAKES REGIONAL WATER - OSGOOD · 9,021 people · 2017
Highest in the ZIP: 9.475 µg/L — OSCEOLA RURAL WATER SYSTEM-NORTH · 7,002 people · 2017 | 3/3 | SYR4 |
| Gross Alpha, Excl. Radon And U | 6.55 pCi/L 44% of the EPA limit 15 pCi/L Highest in the ZIP: OSCEOLA RURAL WATER SYSTEM-NORTH · 7,002 people · 2016 | 1/3 | SYR4 |
| Ethylbenzene | 4.9 µg/L 0.7% of the EPA limit 700 µg/L Highest in the ZIP: OSCEOLA RURAL WATER SYSTEM-NORTH · 7,002 people · 2018 | 1/3 | SYR4 |
| Dibromoacetic Acid | 3 µg/L No EPA limit set Main supplier: IOWA LAKES REGIONAL WATER - OSGOOD · 9,021 people · 2019
Highest in the ZIP: 3.1 µg/L — OSCEOLA RURAL WATER SYSTEM-NORTH · 7,002 people · 2019 | 2/3 | SYR4 |
| Chromium | 2.02 µg/L 2% of the EPA limit 100 µg/L Highest in the ZIP: OSCEOLA RURAL WATER SYSTEM-NORTH · 7,002 people · 2016 | 1/3 | SYR4 |
| Arsenic | 1.875 µg/L 19% of the EPA limit 10 µg/L Highest in the ZIP: OSCEOLA RURAL WATER SYSTEM-NORTH · 7,002 people · 2016 | 1/3 | SYR4 |
| Combined Radium (-226 And -228) | 1.575 pCi/L 32% of the EPA limit 5 pCi/L Highest in the ZIP: OSCEOLA RURAL WATER SYSTEM-NORTH · 7,002 people · 2018 | 1/3 | SYR4 |
| Bromoform | 1.555 µg/L No EPA limit set Main supplier: IOWA LAKES REGIONAL WATER - OSGOOD · 9,021 people · 2019 | 2/3 | SYR4 |
| Monobromoacetic Acid | 1 µg/L No EPA limit set Highest in the ZIP: OKOBOJI WATER SUPPLY · 776 people · 2019 | 1/3 | SYR4 |
| Selenium | 0.6000 µg/L 1.2% of the EPA limit 50 µg/L Highest in the ZIP: OSCEOLA RURAL WATER SYSTEM-NORTH · 7,002 people · 2016 | 1/3 | SYR4 |
| Antimony, Total | 0.1000 µg/L 1.7% of the EPA limit 6 µg/L Highest in the ZIP: OSCEOLA RURAL WATER SYSTEM-NORTH · 7,002 people · 2016 | 1/3 | SYR4 |
| Pfba | 0.0050 µg/L No EPA limit set Main supplier: IOWA LAKES REGIONAL WATER - OSGOOD · 9,021 people · 2023
Highest in the ZIP: 0.0092 µg/L — OKOBOJI WATER SUPPLY · 776 people · 2025 | 2/3 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: IOWA LAKES REGIONAL WATER - OSGOOD · 9,021 people · 2025
Highest in the ZIP: 0.0049 mg/L — OSCEOLA RURAL WATER SYSTEM-NORTH · 7,002 people · 2024 | 3/3 | 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 51355
| Supplier | State | Population served |
|---|---|---|
| IOWA LAKES REGIONAL WATER - OSGOOD | IA | 9,021 |
| OSCEOLA RURAL WATER SYSTEM-NORTH | IA | 7,002 |
| OKOBOJI WATER SUPPLY | IA | 776 |
Frequently asked questions about ZIP 51355 tap water
Is the tap water in ZIP 51355 safe to drink?
EPA testing detected 28 contaminants across the water suppliers serving ZIP 51355. 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 51355?
3 public water suppliers report EPA drinking-water monitoring for ZIP 51355. Each is listed above with its population served.
What contaminants are in ZIP 51355's water?
EPA monitoring detected Copper, Fluoride, Nitrate, TTHM, Barium, and others across this ZIP's suppliers. The full list with levels and sources is above.