Chatham, PA: High Radon Risk — 40/100 (2026)
1 ZIP code · 1 water system · Updated 2026-06-03
Unlike better-scoring cities in PA, Chatham records health-based violations across a meaningful portion of its service areas — the overall safety grade is well below average.
How Chatham Compares
Data: EPA SDWIS Last verified: 2026-06-03
Who Supplies Your Water in Chatham
Water service in Chatham, PA is organized around a single utility — one of 1 tracked by regulator, and the one that manages the local distribution network while holding primary responsibility for EPA compliance reporting.
Overview
We track water quality and home safety data for 1 ZIP code in Chatham, Pennsylvania, covering 1 community water system serving approximately 4,770 people.
No EPA violations recorded across any ZIP codes in Chatham — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Chatham: D (40/100)
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
Chatham water systems draw from: Surface water.
Lead & Copper
- Lead data: not yet available for Chatham
- 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 |
|---|---|---|---|
| 19318 | D | LONDON GROVE TWP MUN AUTH | 4,770 |
All ZIP Codes in Chatham
- 19318 [D]
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.
What You Can Do in Chatham
- 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. Homes built before 1986 may have lead solder in pipes. A licensed plumber can assess your risk.
- Review your water system's CCR. Your utility publishes an annual Consumer Confidence Report with detailed test results. Request it or find it online.
Deep Dive Reports
Detailed analysis for Chatham, PA