Redwood County, MN
These figures come from wells tested in Redwood County, MN, not from any one well.
- Iron is common in wells in Redwood County, MN (79 of 107 tested wells were over that level), so it's worth testing for.
- Manganese is common in wells in Redwood County, MN (80 of 107 tested wells were over that level), so it's worth testing for.
- Sulfate is common in wells in Redwood County, MN (101 of 187 tested wells were over that level), so it's worth testing for.
- Wells in Redwood County, MN are typically very hard (187 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. Minnesota'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 | 74% |
| Wells over the level / wells judged | 79 of 107 |
| Median | 2.1 mg/L |
| Years sampled | 1964–2025 |
| Wells | 107 |
| Test results | 228 |
| Wells left out | 10 |
| Sources | MNDNR_AGW (103), USGS (57), MNPCA_AGW (15), LSIOUX_WQX (8) |
Manganese Recent
| Level it's compared with | 0.05 mg/L |
|---|---|
| Share of wells over the level | 75% |
| Wells over the level / wells judged | 80 of 107 |
| Median | 0.161 mg/L |
| Years sampled | 1953–2025 |
| Wells | 107 |
| Test results | 222 |
| Wells left out | 10 |
| Sources | MNDNR_AGW (103), USGS (59), MNPCA_AGW (15), LSIOUX_WQX (8) |
Hardness Recent
| Level it's compared with | none; hardness is shown in bands |
|---|---|
| Share of wells very hard | 89% |
| Median | 540 mg/L as CaCO₃ |
| Years sampled | 1953–2025 |
| Wells | 187 |
| Test results | 221 |
| Wells left out | 10 |
| Sources | MNDNR_AGW (103), USGS (61), MNPCA_AGW (15), LSIOUX_WQX (8) |
Sulfate Recent
| Level it's compared with | 250 mg/L |
|---|---|
| Share of wells over the level | 54% |
| Wells over the level / wells judged | 101 of 187 |
| Median | 270 mg/L |
| Years sampled | 1953–2025 |
| Wells | 187 |
| Test results | 227 |
| Wells left out | 11 |
| Sources | MNDNR_AGW (101), USGS (61), MNPCA_AGW (17), LSIOUX_WQX (8) |