Clay County, FL
These figures come from wells tested in Clay County, FL, not from any one well.
- Iron is common in wells in Clay County, FL (18 of 53 tested wells were over that level), so it's worth testing for.
- Manganese and sulfate are not common in wells in Clay County, FL (2 of 53 and 1 of 61 tested wells were over). Only a test tells you about your own well.
- Wells in Clay County, FL are typically moderately hard (62 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
- 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 | 34% |
| Wells over the level / wells judged | 18 of 53 |
| Median | 0.051 mg/L |
| Years sampled | 1960–2024 |
| Wells | 53 |
| Test results | 178 |
| Wells left out | 18 |
| Sources | 21FLSJWM_WQX (26), 21FLGW_WQX (25), USGS (4) |
Manganese Recent
| Level it's compared with | 0.05 mg/L |
|---|---|
| Share of wells over the level | 3.8% |
| Wells over the level / wells judged | 2 of 53 |
| Median | 0.00165213 mg/L |
| Years sampled | 2002–2024 |
| Wells | 53 |
| Test results | 176 |
| Wells left out | 18 |
| Sources | 21FLSJWM_WQX (26), 21FLGW_WQX (25), USGS (2) |
Hardness Recent
| Level it's compared with | none; hardness is shown in bands |
|---|---|
| Share of wells very hard | 9.7% |
| Median | 84.4556 mg/L as CaCO₃ |
| Years sampled | 1960–2024 |
| Wells | 62 |
| Test results | 247 |
| Wells left out | 18 |
| Sources | 21FLSJWM_WQX (26), 21FLGW_WQX (25), USGS (11) |
Sulfate Recent
| Level it's compared with | 250 mg/L |
|---|---|
| Share of wells over the level | 1.6% |
| Wells over the level / wells judged | 1 of 61 |
| Median | 3.3274 mg/L |
| Years sampled | 1960–2024 |
| Wells | 61 |
| Test results | 215 |
| Wells left out | 9 |
| Sources | 21FLSJWM_WQX (26), 21FLGW_WQX (25), USGS (10) |