Winterthur, DE Water Safety: 60/100 (2026)
1 ZIP code · 1 water system · Updated 2026-06-03
While Winterthur avoids DE's lowest safety tiers, a portion of its water systems have logged documented violations.
How Winterthur Compares
Data: EPA SDWIS Last verified: 2026-06-03
What You Should Know About Winterthur Water
- Average lead level: 0.012 mg/L.
- Estimated remediation: $400 per household.
- CDC health risk index: 12.25 — above typical levels.
Who Supplies Your Water in Winterthur
The structure of water supply in Winterthur, DE 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 Winterthur, Delaware, covering 1 community water system serving approximately 687 people.
No EPA violations recorded across any ZIP codes in Winterthur — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Winterthur: C (60/100)
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
Winterthur water systems draw from: Groundwater.
Lead & Copper
- Average lead level (90th percentile): 0.0120 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 2 (Moderate 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 |
|---|---|---|---|
| 19735 | C | Winterthur | 687 |
All ZIP Codes in Winterthur
- 19735 [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 Winterthur
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
Lead Exposure Risk for Children in Winterthur
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.
Lead risk in Winterthur appears low overall, but individual homes may differ. Testing is the only way to confirm your water's lead content.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
What You Can Do in Winterthur
- Test your water at home. City-level data shows averages — your tap may differ. Lead testing is especially recommended given the area's lead levels.
- Install a certified water filter. An NSF-certified pitcher or under-sink filter removes most common contaminants.
- Check your home's plumbing. Homes built before 1986 may have lead solder in pipes. A licensed plumber can assess your risk.
Deep Dive Reports
Detailed analysis for Winterthur, DE