Is Rock Rapids, Iowa tap water safe?
4 water systems report serving Rock Rapids. Your water depends on which one serves your address. Check your bill if unsure.
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Rock Rapids Municipal Water Works
Serves 2,611 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 (2024).
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Lyon-Sioux Rws-Big Sioux
Serves 1,530 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).
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Lyon-Sioux Rws-Rock Rapids
Serves 1,187 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 (2024).
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Lyon-Sioux Rws-Boyden
Serves 605 people · Groundwater · Full report →
No health-based violations in the last 5 years; 1 monitoring/reporting violation; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2023).