Glacier County, MT
These figures come from wells tested in Glacier County, MT, not from any one well.
- Iron is common in wells in Glacier County, MT (7 of 32 tested wells were over that level), so it's worth testing for.
- Manganese is common in wells in Glacier County, MT (9 of 32 tested wells were over that level), so it's worth testing for.
- Sulfate is common in wells in Glacier County, MT (52 of 107 tested wells were over that level), so it's worth testing for.
- Wells in Glacier County, MT are typically very hard (100 wells tested).
- Only a test of your own well tells you about your water.
What to test for
Start with the four this site covers:
- iron (common in wells here)
- manganese (common in wells here)
- sulfate (common in wells here)
- hardness
Most well owners also test for these. We point to the source and don't interpret the results.
- arsenic: occurs naturally in groundwater in many regions. USGS: arsenic and drinking water
- nitrate: common near farmland and septic systems. EPA: private drinking water wells
- total coliform bacteria: the standard yearly well check. EPA: private drinking water wells
- lead and copper: from household plumbing, especially when pH is below 6.5. EPA: lead in drinking water
- PFAS: several states run private-well sampling programs. EPA: PFAS
- a certified lab: states certify labs and some run their own private-well programs. Montana's certified-lab list (from your state drinking-water program)
The numbers
County figures describe the wells sampled there, not any one well. Exact counts, sample years and sources are below.
Iron Recent
| Level it's compared with | 0.3 mg/L |
|---|---|
| Share of wells over the level | 22% |
| Wells over the level / wells judged | 7 of 32 |
| Median | < DL mg/L |
| Years sampled | 1949–2024 |
| Wells | 32 |
| Test results | 147 |
| Wells left out | 0 |
| Sources | USGS (63), BLCKFEET (31) |
More than half the wells had results below the lab's detection limit, so the median is reported as below that limit.
Manganese Recent
| Level it's compared with | 0.05 mg/L |
|---|---|
| Share of wells over the level | 28% |
| Wells over the level / wells judged | 9 of 32 |
| Median | 0.0041 mg/L |
| Years sampled | 1976–2024 |
| Wells | 32 |
| Test results | 112 |
| Wells left out | 0 |
| Sources | BLCKFEET (31), USGS (27) |
Hardness Recent
| Level it's compared with | none; hardness is shown in bands |
|---|---|
| Share of wells very hard | 57% |
| Median | 219.905 mg/L as CaCO₃ |
| Years sampled | 1933–2024 |
| Wells | 100 |
| Test results | 136 |
| Wells left out | 0 |
| Sources | USGS (68), BLCKFEET (31), MONT_DEQ_WQX (1) |
Sulfate Recent
| Level it's compared with | 250 mg/L |
|---|---|
| Share of wells over the level | 49% |
| Wells over the level / wells judged | 52 of 107 |
| Median | 230 mg/L |
| Years sampled | 1932–2024 |
| Wells | 107 |
| Test results | 147 |
| Wells left out | 0 |
| Sources | USGS (75), BLCKFEET (31), MONT_DEQ_WQX (1) |