Caddo Parish, LA
These figures come from wells tested in Caddo Parish, LA, not from any one well.
- Iron is common in wells in Caddo Parish, LA (18 of 53 tested wells were over that level), so it's worth testing for.
- Manganese is common in wells in Caddo Parish, LA (18 of 53 tested wells were over that level), so it's worth testing for.
- Sulfate is not common in wells in Caddo Parish, LA (7 of 257 tested wells were over). Only a test tells you about your own well.
- Wells in Caddo Parish, LA are typically moderately hard (360 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. Louisiana'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 | 0.0378 mg/L |
| Years sampled | 1941–2015 |
| Wells | 53 |
| Test results | 602 |
| Wells left out | 0 |
| Sources | USGS (184), 22LAGWTR (6) |
Manganese Recent
| Level it's compared with | 0.05 mg/L |
|---|---|
| Share of wells over the level | 34% |
| Wells over the level / wells judged | 18 of 53 |
| Median | 0.019 mg/L |
| Years sampled | 1957–2015 |
| Wells | 53 |
| Test results | 551 |
| Wells left out | 0 |
| Sources | USGS (160) |
Hardness Recent
| Level it's compared with | none; hardness is shown in bands |
|---|---|
| Share of wells very hard | 29% |
| Median | 69.9 mg/L as CaCO₃ |
| Years sampled | 1940–2015 |
| Wells | 360 |
| Test results | 859 |
| Wells left out | 0 |
| Sources | USGS (360) |
Sulfate Recent
| Level it's compared with | 250 mg/L |
|---|---|
| Share of wells over the level | 2.7% |
| Wells over the level / wells judged | 7 of 257 |
| Median | 4.2 mg/L |
| Years sampled | 1941–2015 |
| Wells | 257 |
| Test results | 671 |
| Wells left out | 0 |
| Sources | USGS (257) |