Union County, FL
These figures come from wells tested in Union County, FL, not from any one well.
- Iron is common in wells in Union County, FL (6 of 28 tested wells were over that level), so it's worth testing for.
- Manganese and sulfate are not common in wells in Union County, FL (0 of 19 and 0 of 19 tested wells were over). Only a test tells you about your own well.
- Wells in Union County, FL are typically hard (29 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 | 21% |
| Wells over the level / wells judged | 6 of 28 |
| Median | 0.087 mg/L |
| Years sampled | 1980–2026 |
| Wells | 28 |
| Test results | 117 |
| Wells left out | 0 |
| Sources | 21FLGW_WQX (12), 21FLSUW (10), 21FLSUW_WQX (4), USGS (3) |
Manganese Recent
| Level it's compared with | 0.05 mg/L |
|---|---|
| Share of wells over the level | 0.0% |
| Wells over the level / wells judged | 0 of 19 |
| Median | 0.0089 mg/L |
| Years sampled | 1980–2026 |
| Wells | 19 |
| Test results | 52 |
| Wells left out | 0 |
| Sources | 21FLGW_WQX (12), 21FLSUW_WQX (4), USGS (3), 21FLSUW (1) |
Hardness Recent
| Level it's compared with | none; hardness is shown in bands |
|---|---|
| Share of wells very hard | 34% |
| Median | 167 mg/L as CaCO₃ |
| Years sampled | 1980–2026 |
| Wells | 29 |
| Test results | 112 |
| Wells left out | 0 |
| Sources | 21FLGW_WQX (12), 21FLSUW (10), 21FLSUW_WQX (4), USGS (3) |
Sulfate Recent
| Level it's compared with | 250 mg/L |
|---|---|
| Share of wells over the level | 0.0% |
| Wells over the level / wells judged | 0 of 19 |
| Median | 6.6 mg/L |
| Years sampled | 1980–2026 |
| Wells | 19 |
| Test results | 49 |
| Wells left out | 0 |
| Sources | 21FLGW_WQX (12), 21FLSUW_WQX (4), USGS (3) |