Chester County, PA
These figures come from wells tested in Chester County, PA, not from any one well.
- Manganese is common in wells in Chester County, PA (25 of 130 tested wells were over that level), so it's worth testing for.
- Iron and sulfate are not common in wells in Chester County, PA (10 of 130 and 2 of 815 tested wells were over). Only a test tells you about your own well.
- Wells in Chester County, PA are typically moderately hard (677 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)
- iron
- hardness
- sulfate
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. Pennsylvania'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 | 7.7% |
| Wells over the level / wells judged | 10 of 130 |
| Median | 0.00605 mg/L |
| Years sampled | 1925–2021 |
| Wells | 130 |
| Test results | 1,263 |
| Wells left out | 1 |
| Sources | USGS (812) |
Manganese Recent
| Level it's compared with | 0.05 mg/L |
|---|---|
| Share of wells over the level | 19% |
| Wells over the level / wells judged | 25 of 130 |
| Median | 0.006795 mg/L |
| Years sampled | 1957–2021 |
| Wells | 130 |
| Test results | 1,241 |
| Wells left out | 1 |
| Sources | USGS (787) |
Hardness Recent
| Level it's compared with | none; hardness is shown in bands |
|---|---|
| Share of wells very hard | 20% |
| Median | 73.9 mg/L as CaCO₃ |
| Years sampled | 1925–2021 |
| Wells | 677 |
| Test results | 1,083 |
| Wells left out | 1 |
| Sources | USGS (677) |
Sulfate Recent
| Level it's compared with | 250 mg/L |
|---|---|
| Share of wells over the level | 0.2% |
| Wells over the level / wells judged | 2 of 815 |
| Median | 17.7 mg/L |
| Years sampled | 1925–2021 |
| Wells | 815 |
| Test results | 1,325 |
| Wells left out | 1 |
| Sources | USGS (815) |