What was found in East Helena's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate-Nitrite | 1830 µg/L 18% of the EPA limit 10000 µg/L Main supplier: EASTGATE VILLAGE SEWER AND WATER · 2,000 people · 2019
Highest in the city: 7635 µg/L — PHOENIX PARK · 36 people · 2019 | 10/10 | SYR4 |
| Fluoride | 398.2 µg/L 10% of the EPA limit 4000 µg/L Main supplier: EASTGATE VILLAGE SEWER AND WATER · 2,000 people · 2019
Highest in the city: 610 µg/L — MOUNTAIN HERITAGE WATER SYSTEM · 175 people · 2013 | 10/10 | SYR4 |
| Copper | 105.6 µg/L 8.1% of the EPA limit 1300 µg/L Main supplier: EASTGATE VILLAGE SEWER AND WATER · 2,000 people · 2019
Highest in the city: 389.65 µg/L — BAHNY BRAE SUBDIVISION · 35 people · 2019 | 10/10 | SYR4 |
| Barium | 51.95 µg/L 2.6% of the EPA limit 2000 µg/L Main supplier: EASTGATE VILLAGE SEWER AND WATER · 2,000 people · 2019
Highest in the city: 60 µg/L — MCDONALD TRAILER CT · 75 people · 2019 | 7/10 | SYR4 |
| Combined Uranium | 7 µg/L 23% of the EPA limit 30 µg/L Main supplier: EASTGATE VILLAGE SEWER AND WATER · 2,000 people · 2016
Highest in the city: 16 µg/L — PHOENIX PARK · 36 people · 2017 | 8/10 | SYR4 |
| Lead | 8.5 µg/L 57% of the EPA limit 15 µg/L Highest in the city: BUZZ INN · 95 people · 2018 | 6/10 | SYR4 |
| Gross Alpha, Excl. Radon And U | 5.685 pCi/L 38% of the EPA limit 15 pCi/L Main supplier: EASTGATE VILLAGE SEWER AND WATER · 2,000 people · 2016
Highest in the city: 6.895 pCi/L — SUNNYBROOK ACRES HOA · 50 people · 2016 | 7/10 | SYR4 |
| Arsenic | 2.9 µg/L 29% of the EPA limit 10 µg/L Main supplier: EASTGATE VILLAGE SEWER AND WATER · 2,000 people · 2019
Highest in the city: 5.9 µg/L — MOUNTAIN HERITAGE WATER SYSTEM · 175 people · 2019 | 5/10 | SYR4 |
| Selenium | 2.95 µg/L 5.9% of the EPA limit 50 µg/L Main supplier: EASTGATE VILLAGE SEWER AND WATER · 2,000 people · 2019
Highest in the city: 5 µg/L — BUZZ INN · 95 people · 2019 | 6/10 | SYR4 |
| Gross Beta Particle Activity | 4.6 pCi/L No EPA limit set Highest in the city: MCDONALD TRAILER CT · 75 people · 2014 | 2/10 | SYR4 |
| Total Haloacetic Acids (HAA5) | 4.079 µg/L 6.8% of the EPA limit 60 µg/L Highest in the city: MOUNTAIN HERITAGE WATER SYSTEM · 175 people · 2015 | 1/10 | SYR4 |
| TTHM | 3.2285 µg/L 4% of the EPA limit 80 µg/L Highest in the city: MOUNTAIN HERITAGE WATER SYSTEM · 175 people · 2015 | 1/10 | SYR4 |
| Trichloroacetic Acid | 3.05 µg/L No EPA limit set Highest in the city: MOUNTAIN HERITAGE WATER SYSTEM · 175 people · 2015 | 1/10 | SYR4 |
| Bromoform | 2.2975 µg/L No EPA limit set Highest in the city: MOUNTAIN HERITAGE WATER SYSTEM · 175 people · 2019 | 1/10 | SYR4 |
| Combined Radium (-226 And -228) | 1.6 pCi/L 32% of the EPA limit 5 pCi/L Highest in the city: MCDONALD TRAILER CT · 75 people · 2016 | 6/10 | SYR4 |
| Dichloroacetic Acid | 1.23 µg/L No EPA limit set Highest in the city: MOUNTAIN HERITAGE WATER SYSTEM · 175 people · 2015 | 1/10 | SYR4 |
| Chromium | 1 µg/L 1% of the EPA limit 100 µg/L Highest in the city: PELE PARK · 186 people · 2013 | 1/10 | SYR4 |
| Dibromoacetic Acid | 0.9680 µg/L No EPA limit set Highest in the city: MOUNTAIN HERITAGE WATER SYSTEM · 175 people · 2015 | 1/10 | SYR4 |
| Dibromochloromethane | 0.9200 µg/L No EPA limit set Highest in the city: PELE PARK · 186 people · 2019 | 2/10 | SYR4 |
| Chloroform | 0.8100 µg/L No EPA limit set Highest in the city: PELE PARK · 186 people · 2019 | 1/10 | SYR4 |
| Toluene | 0.7500 µg/L 0.1% of the EPA limit 1000 µg/L Highest in the city: MCDONALD TRAILER CT · 75 people · 2019 | 1/10 | SYR4 |
| Lead | 0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L Main supplier: EASTGATE VILLAGE SEWER AND WATER · 2,000 people · 2025
Highest in the city: 0.0100 mg/L — MOUNTAIN HERITAGE WATER SYSTEM · 175 people · 2024 | 10/10 | 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.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving East Helena
| Supplier | Population served |
|---|---|
| EASTGATE VILLAGE SEWER AND WATER | 2,000 |
| PELE PARK | 186 |
| DAVIS MEADOW VILLAGE | 180 |
| MOUNTAIN HERITAGE WATER SYSTEM | 175 |
| BUZZ INN | 95 |
| MCDONALD TRAILER CT | 75 |
| DAKOTA VALLEY MOBILE HOME PARK | 75 |
| SUNNYBROOK ACRES HOA | 50 |
| PHOENIX PARK | 36 |
| BAHNY BRAE SUBDIVISION | 35 |
Frequently asked questions about East Helena tap water
Is East Helena tap water safe to drink?
EPA testing detected 22 contaminants in the water serving East Helena. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve East Helena?
10 public water suppliers report drinking-water monitoring for East Helena, Montana to the EPA. Each is listed above with its population served.
What contaminants are in East Helena's water?
The contaminants EPA monitoring detected in East Helena include Nitrate-Nitrite, Fluoride, Copper, Barium, Combined Uranium. The full list, with the level at the main supplier and the data source, is in the table above.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.