What was found in ZIP 59401
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 | 1950 µg/L 150% of the EPA limit, in the worst sample — 1300 µg/L | 1/1 | SYR4 |
| Fluoride | 900 µg/L 23% of the EPA limit 4000 µg/L | 1/1 | SYR4 |
| Nitrate-Nitrite | 270 µg/L 2.7% of the EPA limit 10000 µg/L | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 109 µg/L 182% of the EPA limit, in the worst sample — 60 µg/L | 1/1 | SYR4 |
| TTHM | 104 µg/L 130% of the EPA limit, in the worst sample — 80 µg/L | 1/1 | SYR4 |
| Chloroform | 93 µg/L No EPA limit set | 1/1 | SYR4 |
| Lithium | 80.8 µg/L No EPA limit set | 1/1 | UCMR-5 |
| Trichloroacetic Acid | 61 µg/L No EPA limit set | 1/1 | SYR4 |
| Barium | 50 µg/L 2.5% of the EPA limit 2000 µg/L | 1/1 | SYR4 |
| Dichloroacetic Acid | 48 µg/L No EPA limit set | 1/1 | SYR4 |
| Lead | 24 µg/L 160% of the EPA limit, in the worst sample — 15 µg/L | 1/1 | SYR4 |
| Bromodichloromethane | 16 µg/L No EPA limit set | 1/1 | SYR4 |
| Arsenic | 4 µg/L 40% of the EPA limit 10 µg/L | 1/1 | SYR4 |
| Monochloroacetic Acid | 4 µg/L No EPA limit set | 1/1 | SYR4 |
| Dibromochloromethane | 3.7 µg/L No EPA limit set | 1/1 | SYR4 |
| Gross Alpha, Excl. Radon And U | 3.2 pCi/L 21% of the EPA limit 15 pCi/L | 1/1 | SYR4 |
| Monobromoacetic Acid | 1.8 µg/L No EPA limit set | 1/1 | SYR4 |
| Dibromoacetic Acid | 1.1 µg/L No EPA limit set | 1/1 | SYR4 |
| Combined Uranium | 1 µg/L 3.3% of the EPA limit 30 µg/L | 1/1 | SYR4 |
| Hexachlorocyclopentadiene | 0.1200 µg/L 0.2% of the EPA limit 50 µg/L | 1/1 | SYR4 |
| Lead | 0.0120 mg/L 80% 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 59401
| Supplier | State | Population served |
|---|---|---|
| GREAT FALLS CITY OF | MT | 60,000 |
Frequently asked questions about ZIP 59401 tap water
Is the tap water in ZIP 59401 safe to drink?
EPA testing detected 21 contaminants across the water suppliers serving ZIP 59401. 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 59401?
1 public water supplier report EPA drinking-water monitoring for ZIP 59401. Each is listed above with its population served.
What contaminants are in ZIP 59401's water?
EPA monitoring detected Copper, Fluoride, Nitrate-Nitrite, Total Haloacetic Acids (HAA5), TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.