CITY REPORT
DE
Winterthur, DE Water Quality Report
1 ZIP code · 1 water system · Updated 2026-03-16
Data: EPA SDWIS Last verified: 2026-03-16
1
ZIP Codes
1
Water Systems
0
ZIPs with Violations
Zone 1
Radon Risk (High)
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.
Water Sources
Winterthur water systems draw from: Groundwater.
Lead & Copper
- Lead data: not yet available for Winterthur
- 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 |
|---|---|---|---|
| 19735 | — | WINTERTHUR | 687 |
All ZIP Codes in Winterthur
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.