Is Denison, Iowa tap water safe?
2 water systems report serving Denison. Your water depends on which one serves your address. Check your bill if unsure.
A
Denison Water Supply
Serves 9,381 people · Groundwater · Full report →
No health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
A
W Central RWA - Denison Subsys
Serves 2,428 people · Groundwater · Full report →
No health-based violations in the last 5 years; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2025).