Pasco County, FL
These figures come from wells tested in Pasco County, FL, not from any one well.
- Iron is common in wells in Pasco County, FL (75 of 134 tested wells were over that level), so it's worth testing for.
- Manganese is common in wells in Pasco County, FL (9 of 55 tested wells were over that level), so it's worth testing for.
- Sulfate is not common in wells in Pasco County, FL (8 of 224 tested wells were over). Only a test tells you about your own well.
- Wells in Pasco County, FL are typically hard (202 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)
- 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. Florida'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 | 56% |
| Wells over the level / wells judged | 75 of 134 |
| Median | 0.4845 mg/L |
| Years sampled | 1962–2025 |
| Wells | 134 |
| Test results | 426 |
| Wells left out | 14 |
| Sources | USGS (141), 21FLGW_WQX (22), 21FLSWFD_WQX (19) |
Manganese Recent
| Level it's compared with | 0.05 mg/L |
|---|---|
| Share of wells over the level | 16% |
| Wells over the level / wells judged | 9 of 55 |
| Median | 0.0075 mg/L |
| Years sampled | 1973–2025 |
| Wells | 55 |
| Test results | 207 |
| Wells left out | 14 |
| Sources | 21FLGW_WQX (22), 21FLSWFD_WQX (19), USGS (18) |
Hardness Recent
| Level it's compared with | none; hardness is shown in bands |
|---|---|
| Share of wells very hard | 48% |
| Median | 175.25 mg/L as CaCO₃ |
| Years sampled | 1962–2025 |
| Wells | 202 |
| Test results | 463 |
| Wells left out | 14 |
| Sources | USGS (161), 21FLGW_WQX (22), 21FLSWFD_WQX (19) |
Sulfate Recent
| Level it's compared with | 250 mg/L |
|---|---|
| Share of wells over the level | 3.6% |
| Wells over the level / wells judged | 8 of 224 |
| Median | 4.55 mg/L |
| Years sampled | 1962–2025 |
| Wells | 224 |
| Test results | 554 |
| Wells left out | 14 |
| Sources | USGS (183), 21FLGW_WQX (22), 21FLSWFD_WQX (19) |