Navajo County · Arizona · EPA SDWIS 2026Q2
Sun Valley Water Quality
What's in Sun Valley's water
Total Trihalomethanes (TTHM)
Violation on record
11 EPA violations on record (most recent 2025). TTHM form when chlorine used to disinfect water reacts with natural organic matter. Long-term exposure has been linked to increased cancer risk and to harm in pregnancy. Levels often rise in warmer months and in systems with more organic material.
Haloacetic Acids (HAA5)
Violation on record
6 EPA violations on record (most recent 2025). HAA5 are a second group of chlorine disinfection byproducts formed when chlorine reacts with organic matter in water. Long-term exposure is associated with increased cancer risk and possible developmental effects. They commonly occur together with trihalomethanes.
Water hardness
very hard
Sun Valley'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.
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SUN VALLEY UTILITIES
- Population served
- 287
- PWSID
- AZ0409001
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