Yavapai County, AZ
These figures come from wells tested in Yavapai County, AZ, not from any one well.
- Manganese is common in wells in Yavapai County, AZ (30 of 203 tested wells were over that level), so it's worth testing for.
- Iron and sulfate are not common in wells in Yavapai County, AZ (8 of 199 and 47 of 762 tested wells were over). Only a test tells you about your own well.
- Wells in Yavapai County, AZ are typically very hard (875 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. Arizona'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 | 4.0% |
| Wells over the level / wells judged | 8 of 199 |
| Median | < 1 mg/L |
| Years sampled | 1957–2025 |
| Wells | 199 |
| Test results | 1,239 |
| Wells left out | 12 |
| Sources | USGS (462), AZDEQ_GW (199), 21ARIZGW (117), 11NPSWRD_WQX (3), AZDEQ_SW (3) |
More than half the wells had results below the lab's detection limit, so the median is reported as below that limit.
Manganese Recent
| Level it's compared with | 0.05 mg/L |
|---|---|
| Share of wells over the level | 15% |
| Wells over the level / wells judged | 30 of 203 |
| Median | < 0.1 mg/L |
| Years sampled | 1959–2025 |
| Wells | 203 |
| Test results | 1,170 |
| Wells left out | 29 |
| Sources | USGS (419), AZDEQ_GW (199), 21ARIZGW (117), YPIT_WQX (4), 11NPSWRD_WQX (3), AZDEQ_SW (3) |
More than half the wells had results below the lab's detection limit, so the median is reported as below that limit.
Hardness Recent
| Level it's compared with | none; hardness is shown in bands |
|---|---|
| Share of wells very hard | 72% |
| Median | 240 mg/L as CaCO₃ |
| Years sampled | 1936–2025 |
| Wells | 875 |
| Test results | 1,632 |
| Wells left out | 9 |
| Sources | USGS (521), AZDEQ_GW (236), 21ARIZGW (108), YPIT_WQX (4), 11NPSWRD_WQX (3), AZDEQ_SW (3) |
Sulfate Recent
| Level it's compared with | 250 mg/L |
|---|---|
| Share of wells over the level | 6.2% |
| Wells over the level / wells judged | 47 of 762 |
| Median | 19 mg/L |
| Years sampled | 1937–2025 |
| Wells | 762 |
| Test results | 1,187 |
| Wells left out | 51 |
| Sources | USGS (521), AZDEQ_GW (235), YPIT_WQX (4), AZDEQ_SW (2) |