Helena Water System
Helena, MT
MT0000241
Contaminants Exceeding Limits
The following contaminants have exceeded the guideline limits at least once in the past ten years.
- TR
Trichloroacetic Acid
Trichloroacetic acid is a byproduct formed when chlorine disinfectants react with organic matter in water. It's commonly found in chlorinated drinking water supplies.
Other Contaminants Detected
The following contaminants have been detected, but not exceeded the guideline limits in the past ten years.
1,4-Dioxane
1 detection
| Avg Result: | 0.018 ppb |
|---|---|
| Limit: | 0.350 ppb |
Arsenic
22 detections
| Avg Result: | 6.067 ppb |
|---|---|
| Limit: | 10.000 ppb |
Bromodichloromethane
108 detections
| Avg Result: | 5.452 ppb |
|---|---|
| Limit: | 80.000 ppb |
Cadmium
1 detection
| Avg Result: | 0.667 ppb |
|---|---|
| Limit: | 5.000 ppb |
Chlorate
3 detections
| Avg Result: | 55.992 ppb |
|---|---|
| Limit: | 210.000 ppb |
Chloroform
110 detections
| Avg Result: | 36.612 ppb |
|---|---|
| Limit: | 70.000 ppb |
Contaminants tested
Contaminants that have been tested but not detected
Summary
- People Served
- 31K
- Surface Water
- Lewis and Clark County
- Data from 2014-2024
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