Niobrara County, WY
These figures come from wells tested in Niobrara County, WY, not from any one well.
- Manganese is common in wells in Niobrara County, WY (4 of 31 tested wells were over that level), so it's worth testing for.
- Sulfate is common in wells in Niobrara County, WY (23 of 77 tested wells were over that level), so it's worth testing for.
- Iron is not common in wells in Niobrara County, WY (1 of 31 tested wells were over). Only a test tells you about your own well.
- Wells in Niobrara County, WY are typically hard (77 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:
- manganese (common in wells here)
- sulfate (common in wells here)
- iron
- 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. Wyoming'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 | 3.2% |
| Wells over the level / wells judged | 1 of 31 |
| Median | < DL mg/L |
| Years sampled | 1952–2015 |
| Wells | 31 |
| Test results | 73 |
| Wells left out | 0 |
| Sources | USGS (69) |
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 | 13% |
| Wells over the level / wells judged | 4 of 31 |
| Median | < 0.002 mg/L |
| Years sampled | 1975–2015 |
| Wells | 31 |
| Test results | 32 |
| Wells left out | 0 |
| Sources | USGS (32) |
More than half the wells had results below the lab's detection limit, so the median is reported as below that limit.
Hardness Recent
| Level it's compared with | none; hardness is shown in bands |
|---|---|
| Share of wells very hard | 47% |
| Median | 177.5 mg/L as CaCO₃ |
| Years sampled | 1952–2015 |
| Wells | 77 |
| Test results | 116 |
| Wells left out | 0 |
| Sources | USGS (77) |
Sulfate Recent
| Level it's compared with | 250 mg/L |
|---|---|
| Share of wells over the level | 30% |
| Wells over the level / wells judged | 23 of 77 |
| Median | 29 mg/L |
| Years sampled | 1952–2015 |
| Wells | 77 |
| Test results | 86 |
| Wells left out | 0 |
| Sources | USGS (77) |