What was found in ZIP 50401
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 |
|---|---|---|---|
| Fluoride | 300 µg/L 7.5% of the EPA limit 4000 µg/L Main supplier: MASON CITY WATER DEPARTMENT · 27,338 people · 2012 | 1/1 | SYR4 |
| Copper | 127.15 µg/L 9.8% of the EPA limit 1300 µg/L Main supplier: MASON CITY WATER DEPARTMENT · 27,338 people · 2017 | 1/1 | SYR4 |
| Lithium | 92 µg/L No EPA limit set Main supplier: MASON CITY WATER DEPARTMENT · 27,338 people · 2024 | 1/1 | UCMR-5 |
| Lead | 16.9 µg/L 113% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: MASON CITY WATER DEPARTMENT · 27,338 people · 2017 | 1/1 | SYR4 |
| Barium | 9.4 µg/L 0.5% of the EPA limit 2000 µg/L Main supplier: MASON CITY WATER DEPARTMENT · 27,338 people · 2012 | 1/1 | SYR4 |
| TTHM | 7.292 µg/L 9.1% of the EPA limit 80 µg/L Main supplier: MASON CITY WATER DEPARTMENT · 27,338 people · 2019 | 1/1 | SYR4 |
| Chloroform | 3.145 µg/L No EPA limit set Main supplier: MASON CITY WATER DEPARTMENT · 27,338 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 2.75 µg/L No EPA limit set Main supplier: MASON CITY WATER DEPARTMENT · 27,338 people · 2019 | 1/1 | SYR4 |
| Monochloroacetic Acid | 2.4 µg/L No EPA limit set Main supplier: MASON CITY WATER DEPARTMENT · 27,338 people · 2019 | 1/1 | SYR4 |
| Combined Radium (-226 And -228) | 2.39 pCi/L 48% of the EPA limit 5 pCi/L Main supplier: MASON CITY WATER DEPARTMENT · 27,338 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 2.1 µg/L No EPA limit set Main supplier: MASON CITY WATER DEPARTMENT · 27,338 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 1.81 µg/L No EPA limit set Main supplier: MASON CITY WATER DEPARTMENT · 27,338 people · 2019 | 1/1 | SYR4 |
| Dibromoacetic Acid | 1.294 µg/L No EPA limit set Main supplier: MASON CITY WATER DEPARTMENT · 27,338 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 1.1855 µg/L No EPA limit set Main supplier: MASON CITY WATER DEPARTMENT · 27,338 people · 2019 | 1/1 | SYR4 |
| Monobromoacetic Acid | 1.15 µg/L No EPA limit set Main supplier: MASON CITY WATER DEPARTMENT · 27,338 people · 2019 | 1/1 | SYR4 |
| Lead | 0.0029 mg/L 19% of the EPA limit 0.0150 mg/L Main supplier: MASON CITY WATER DEPARTMENT · 27,338 people · 2023 | 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 50401
| Supplier | State | Population served |
|---|---|---|
| MASON CITY WATER DEPARTMENT | IA | 27,338 |
Frequently asked questions about ZIP 50401 tap water
Is the tap water in ZIP 50401 safe to drink?
EPA testing detected 16 contaminants across the water suppliers serving ZIP 50401. 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 50401?
1 public water supplier report EPA drinking-water monitoring for ZIP 50401. Each is listed above with its population served.
What contaminants are in ZIP 50401's water?
EPA monitoring detected Fluoride, Copper, Lithium, Lead, Barium, and others across this ZIP's suppliers. The full list with levels and sources is above.