Maricopa County · Arizona · EPA SDWIS 2026Q2
Tempe Water Quality
What's in Tempe's water
PFAS (forever chemicals)
14×above guideline
Detected above the EPA's 4 ppt limit for PFOA/PFOS — the "forever chemicals" linked to cancer and immune effects. Compounds found: PFBA, PFBS, PFHpA, PFHxA, PFHxS, PFOA, PFOS, PFPeA, PFPeS.
Total Trihalomethanes (TTHM)
Violation on record
2 EPA violations on record (most recent 2017). 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.
Water hardness
very hard
Tempe'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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TEMPE CITY OF
- Population served
- 165,000
- PWSID
- AZ0407100
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