Santa Cruz County · Arizona · EPA SDWIS 2026Q2
Sonoita Water Quality
What's in Sonoita's water
Radium (combined -226 & -228)
Violation on record
7 EPA violations on record (most recent 2024). Radium is a naturally radioactive element that leaches from rock into groundwater. Long-term exposure increases the risk of bone cancer and other cancers because it concentrates in bone. The federal limit covers the combined activity of radium-226 and radium-228.
Uranium
Violation on record
7 EPA violations on record (most recent 2024). Uranium occurs naturally in rock and dissolves into groundwater, with extra contributions from mining in some regions. It is both a radioactive and a toxic metal; long-term exposure mainly damages the kidneys and increases cancer risk. It is widespread in Western groundwater.
Water hardness
very hard
Sonoita's water is very hard. Hardness isn't a health risk, but it drives scale on fixtures and water heaters, shortens appliance life, and leaves skin and hair dry.
Your water provider
SONOITA VALLEY (SOUTH) WATER COMPANY
- Population served
- 169
- PWSID
- AZ0412005
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