What was found in ZIP 59601
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-Nitrite | 1360 µg/L 14% of the EPA limit 10000 µg/L Main supplier: HELENA WATER SYSTEM · 32,091 people · 2019 | 1/1 | SYR4 |
| Fluoride | 710 µg/L 18% of the EPA limit 4000 µg/L Main supplier: HELENA WATER SYSTEM · 32,091 people · 2017 | 1/1 | SYR4 |
| Copper | 557 µg/L 43% of the EPA limit 1300 µg/L Main supplier: HELENA WATER SYSTEM · 32,091 people · 2018 | 1/1 | SYR4 |
| Oxamyl | 200 µg/L 100% of the EPA limit 200 µg/L Main supplier: HELENA WATER SYSTEM · 32,091 people · 2017 | 1/1 | SYR4 |
| Lithium | 78 µg/L No EPA limit set Main supplier: HELENA WATER SYSTEM · 32,091 people · 2024 | 1/1 | UCMR-5 |
| TTHM | 77.4 µg/L 97% of the EPA limit 80 µg/L Main supplier: HELENA WATER SYSTEM · 32,091 people · 2019 | 1/1 | SYR4 |
| Chloroform | 74.4 µg/L No EPA limit set Main supplier: HELENA WATER SYSTEM · 32,091 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 71.1 µg/L 118% of the EPA limit, at the 95th percentile of samples — 60 µg/L Main supplier: HELENA WATER SYSTEM · 32,091 people · 2019 | 1/1 | SYR4 |
| Carbofuran | 40 µg/L 100% of the EPA limit 40 µg/L Main supplier: HELENA WATER SYSTEM · 32,091 people · 2017 | 1/1 | SYR4 |
| Trichloroacetic Acid | 34 µg/L No EPA limit set Main supplier: HELENA WATER SYSTEM · 32,091 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 30.8 µg/L No EPA limit set Main supplier: HELENA WATER SYSTEM · 32,091 people · 2019 | 1/1 | SYR4 |
| Arsenic | 23.2 µg/L 232% of the EPA limit, at the 95th percentile of samples — 10 µg/L Main supplier: HELENA WATER SYSTEM · 32,091 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 11 µg/L No EPA limit set Main supplier: HELENA WATER SYSTEM · 32,091 people · 2019 | 1/1 | SYR4 |
| Lead | 8 µg/L 53% of the EPA limit 15 µg/L Main supplier: HELENA WATER SYSTEM · 32,091 people · 2018 | 1/1 | SYR4 |
| Monochloroacetic Acid | 6.88 µg/L No EPA limit set Main supplier: HELENA WATER SYSTEM · 32,091 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 3.045 µg/L No EPA limit set Main supplier: HELENA WATER SYSTEM · 32,091 people · 2019 | 1/1 | SYR4 |
| Combined Uranium | 2.95 µg/L 9.8% of the EPA limit 30 µg/L Main supplier: HELENA WATER SYSTEM · 32,091 people · 2017 | 1/1 | SYR4 |
| Gross Alpha, Excl. Radon And U | 2.2 pCi/L 15% of the EPA limit 15 pCi/L Main supplier: HELENA WATER SYSTEM · 32,091 people · 2017 | 1/1 | SYR4 |
| Cadmium | 2 µg/L 40% of the EPA limit 5 µg/L Main supplier: HELENA WATER SYSTEM · 32,091 people · 2017 | 1/1 | SYR4 |
| Monobromoacetic Acid | 1.86 µg/L No EPA limit set Main supplier: HELENA WATER SYSTEM · 32,091 people · 2019 | 1/1 | SYR4 |
| Bromoform | 1.17 µg/L No EPA limit set Main supplier: HELENA WATER SYSTEM · 32,091 people · 2019 | 1/1 | SYR4 |
| Dibromoacetic Acid | 0.9820 µg/L No EPA limit set Main supplier: HELENA WATER SYSTEM · 32,091 people · 2019 | 1/1 | SYR4 |
| trans-1,2-Dichloroethylene | 0.5700 µg/L 0.6% of the EPA limit 100 µg/L Main supplier: HELENA WATER SYSTEM · 32,091 people · 2019 | 1/1 | SYR4 |
| Lead | 0.0030 mg/L 20% of the EPA limit 0.0150 mg/L Main supplier: HELENA WATER SYSTEM · 32,091 people · 2024 | 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 59601
| Supplier | State | Population served |
|---|---|---|
| HELENA WATER SYSTEM | MT | 32,091 |
Frequently asked questions about ZIP 59601 tap water
Is the tap water in ZIP 59601 safe to drink?
EPA testing detected 24 contaminants across the water suppliers serving ZIP 59601. 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 59601?
1 public water supplier report EPA drinking-water monitoring for ZIP 59601. Each is listed above with its population served.
What contaminants are in ZIP 59601's water?
EPA monitoring detected Nitrate-Nitrite, Fluoride, Copper, Oxamyl, Lithium, and others across this ZIP's suppliers. The full list with levels and sources is above.