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DEFIANCE, Iowa Tap Water Quality
250 people served · 1 water system
A
ExcellentDEFIANCE, Iowa is a rural community with 250 residents served by a single public water system. Water service covers ZIP code 51527.
DEFIANCE's drinking water utilities have maintained full EPA compliance over the most recent five-year reporting window — no health-based MCL exceedances have been recorded.
Last updated: 2026-05-18 · Source: EPA SDWIS
Location
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Centered on ZIP-code centroids of water systems serving this city.
ZIP Codes Served
Health-Based Violations (Last 5 Years)
EPA Maximum Contaminant Level exceedances reported by water systems serving DEFIANCE. Each entry explains the contaminant, the health risk, and recommended precautions, and links to a full guide.
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No health-based violations in the last 5 years.
DEFIANCE's water systems have met EPA health-based Maximum Contaminant Level (MCL) requirements throughout the EPA reporting window. This does not mean zero detection of regulated contaminants — it means all measured concentrations remained below their federal action levels.
Water Systems Serving DEFIANCE
What Can You Do?
- ✅ Request your utility's annual Consumer Confidence Report (CCR) — required by law.
- ✅ Use an NSF-certified water filter if violations involve lead, arsenic, or PFAS.
- ✅ Run cold water for 30 seconds before drinking if you have older plumbing (reduces lead).
- ✅ Check back monthly — we update data from the EPA every 30 days.
About this data
This overview reflects EPA SDWIS data published as of 2026-05-18. It covers active Community Water Systems (CWS) that remained within federal Maximum Contaminant Levels during the past five-year EPA reporting window. For up-to-the-minute information, request a current Consumer Confidence Report from your utility, or review the EPA's public dashboard.
Frequently Asked Questions
Is DEFIANCE, Iowa tap water safe to drink?▼
This city's water had no EPA health-based violations in the last 5 years.
How many EPA violations does DEFIANCE have?▼
DEFIANCE has 0 EPA health-based water violations in the last 5 years across 1 water system serving 250 people.
Should I use a water filter in DEFIANCE?▼
Using an NSF-certified water filter is recommended if your area has violations involving lead, arsenic, or PFAS. For other contaminants, consult your local water utility. Check the annual Consumer Confidence Report (CCR) for detailed guidance.
What should I do if there are violations in DEFIANCE?▼
Request your water utility's annual Consumer Confidence Report (CCR), which is required by the EPA. Follow the utility's guidance on boil water advisories. Run cold water for 30 seconds before drinking if you have older plumbing. Use an NSF-certified filter if needed based on your water system's violations.
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