Maricopa County · Arizona · EPA SDWIS 2026Q2
Tolleson Water Quality
What's in Tolleson's water
Haloacetic Acids (HAA5)
Violation on record
2 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.
Total Trihalomethanes (TTHM)
Violation on record
2 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.
PFAS (forever chemicals)
Detected
Detected in the supply below the federal limit. PFAS are "forever chemicals" that don't break down and accumulate over time. Compounds found: PFBA, PFBS.
Water hardness
very hard
Tolleson'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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TOLLESON CITY OF
- Population served
- 9,300
- PWSID
- AZ0407101
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