Corwith, IA: High Radon Risk — 66/100 (2026)
1 ZIP code · 1 water system · Updated 2026-06-03
Corwith's water quality grade in IA reflects a middle-ground assessment — service areas range from fully compliant to violation-flagged in current EPA records.
How Corwith Compares
Data: EPA SDWIS Last verified: 2026-06-03
What You Should Know About Corwith Water
- Average lead level: 0.002 mg/L.
- Homes built before 1986: 94% — older plumbing may contain lead solder.
- Estimated remediation: $1,200 per household.
- CDC health risk index: 14.5 — above typical levels.
Who Supplies Your Water in Corwith
A single utility carries the primary residential water load in Corwith, IA — the dominant provider across 1 federally tracked system.
Overview
We track water quality and home safety data for 1 ZIP code in Corwith, Iowa, covering 1 community water system serving approximately 524 people.
No EPA violations recorded across any ZIP codes in Corwith — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Corwith: 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
Corwith 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 |
|---|---|---|---|
| 50430 | C | Corwith Water Supply | 266 |
All ZIP Codes in Corwith
- 50430 [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.
Health Outcomes in Corwith
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
Housing & Infrastructure in Corwith
With 94% 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
Federal plumbing rules changed in two stages — lead pipes were phased out before 1970, and lead solder was banned in 1986 — but in Corwith, where the median build year is 1947, most of the housing was already in place before those rules took effect. The materials installed under older standards remain embedded in a substantial portion of the residential inventory today.
Over half of homes in Corwith 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.
Cost Context: What Remediation Means for Corwith Homeowners
At current valuations, Corwith falls in the moderate remediation-share tier — a level where treating this as a budgeted line item rather than an ad-hoc expense is the practical approach.
Remediation costs are moderate relative to home values in Corwith. The estimated $800–$1,500 range is manageable for most homeowners but still worth budgeting for. Home values are 57% below the Iowa average.
Lead Exposure Risk for Children in Corwith
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.
Wherever 94% of local housing was built before solder rules changed — as is the case in Corwith — a faucet-level sample closes the gap that aggregate utility data cannot.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
What You Can Do in Corwith
- 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 94% of homes built before 1986, lead solder is a real possibility.
Deep Dive Reports
Detailed analysis for Corwith, IA