Defiance, IA: 7 Violations — 63/100 (2026)
1 ZIP code · 1 water system · Updated 2026-06-03
Compared to top-scoring cities in IA, Defiance lands in the middle tier — some water systems meet standards cleanly, others carry documented violations, and performance can vary significantly across service areas.
How Defiance Compares
Data: EPA SDWIS Last verified: 2026-06-03
Defiance Water: The Quick Version
- Your city's water systems recorded 7 violations in the past 5 years.
- Average lead level: 0.0018 mg/L.
- Homes built before 1986: 87% — older plumbing may contain lead solder.
- Estimated remediation: $1,200 per household.
- CDC health risk index: 14.11 — above typical levels.
Water Systems Serving Defiance
The structure of water supply in Defiance, IA is straightforward: one utility provides the bulk of residential service among 1 tracked system, concentrating rate-setting and infrastructure decisions under a single organization.
Overview
We track water quality and home safety data for 1 ZIP code in Defiance, Iowa, covering 1 community water system serving approximately 346 people.
1 of 1 ZIP code (100%) have recorded EPA violations. All violations are monitoring/reporting type.
Home Safety Score
Average Home Safety Score for Defiance: C (63/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Defiance water systems draw from: Groundwater.
Lead & Copper
- Average lead level (90th percentile): 0.0018 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 1 (High Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Consumer Confidence Report Rule | Reporting | 4 | 1 |
| Stage 1 DBP Rule | Treatment Technique | 2 | 1 |
| Surface Water Treatment Rule | Treatment Technique | 2 | 1 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 51527 | C | 7 | 0 | Defiance Water Department |
All ZIP Codes in Defiance
- 51527 [C] — 7 violations
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Updated daily.
CDC Health Data for Defiance
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Key Contaminants Detected in Defiance
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
How Old Is Defiance's Housing Stock?
With 87% of homes built before 1986, lead solder in plumbing is a potential concern. The EPA banned lead solder in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
When a city's housing median build year is 1954, as in Defiance, the implication for water quality research is straightforward: municipal-level data captures what leaves the treatment plant, but household plumbing from before 1986 determines what actually arrives at the tap. In cities where older housing predominates, that gap between system-level and household-level data is widest.
Over half of homes in Defiance were built before 1986, when lead solder was banned. Older plumbing may leach lead into drinking water, especially with corrosive water chemistry.
Source: U.S. Census Bureau ACS B25034.
Defiance: Remediation Cost in Perspective
The cost-to-value ratio in Defiance is in the moderate range — neither dismissible nor alarming, but above the threshold where remediation can be treated as incidental. Most homeowners here are weighing a real equity commitment, and the moderate classification reflects that accurately.
Remediation costs are moderate relative to home values in Defiance. The estimated $800–$1,500 range is manageable for most homeowners but still worth budgeting for. Home values are 30% below the Iowa average.
Protecting Children from Lead in Defiance
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
After the federal action removing lead-bearing solder from new plumbing took effect, building practice shifted — but 87% of the Defiance inventory predates that line. With aggregate samples near or beyond 0.015 mg/L, an in-home check moves out of the optional column into the standard list.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
What You Can Do in Defiance
- Test your water at home. City-level data shows averages — your tap may differ. NSF-certified test kits cost $20-40 and give results in days.
- Install a certified water filter. Filters rated for Consumer Confidence Report Rule can reduce the most common contaminant found in Defiance's water.
- Check your home's plumbing. With 87% of homes built before 1986, lead solder is a real possibility.
Deep Dive Reports
Detailed analysis for Defiance, IA