Renwick, IA: High Radon Risk — 66/100 (2026)
1 ZIP code · 1 water system · Updated 2026-06-03
Renwick, IA: middle-tier water safety by the latest federal monitoring.
How Renwick Compares
Data: EPA SDWIS Last verified: 2026-06-03
Renwick Water: The Quick Version
- Average lead level: 0.002 mg/L.
- Homes built before 1986: 97% — older plumbing may contain lead solder.
- Estimated remediation: $1,200 per household.
- CDC health risk index: 14.87 — above typical levels.
Water Systems Serving Renwick
The structure of water supply in Renwick, 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 Renwick, Iowa, covering 1 community water system serving approximately 361 people.
No EPA violations recorded across any ZIP codes in Renwick — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Renwick: C (66/100)
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
Renwick water systems draw from: Groundwater.
Lead & Copper
- Average lead level (90th percentile): 0.0020 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.
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 50577 | C | Renwick Munic Water Supply | 234 |
All ZIP Codes in Renwick
- 50577 [C]
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 Renwick
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
How Old Is Renwick's Housing Stock?
With 97% 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
Because the majority of Renwick's housing predates 1986, when lead solder was banned from new plumbing, the median build year of 1948 reflects a city where lead-era plumbing materials are common rather than exceptional.
Over half of homes in Renwick 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.
Renwick: Remediation Cost in Perspective
Within the Renwick property market, documented remediation claims a moderate slice of typical equity — real but budgetable.
Remediation costs are moderate relative to home values in Renwick. The estimated $800–$1,500 range is manageable for most homeowners but still worth budgeting for. Home values are 39% below the Iowa average.
Protecting Children from Lead in Renwick
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.
Older stock in Renwick represents 97% of the inventory, and citywide monitoring runs at or above the federal action level — making an in-home read a standard household-level step.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
What You Can Do in Renwick
- 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. An NSF-certified pitcher or under-sink filter removes most common contaminants.
- Check your home's plumbing. With 97% of homes built before 1986, lead solder is a real possibility.
Deep Dive Reports
Detailed analysis for Renwick, IA