Saint Johns, PA: High Radon Risk — 53/100 (2026)
1 ZIP code · 1 water system · Updated 2026-06-03
A meaningful share of water systems in Saint Johns have recorded health-based violations in recent PA monitoring periods — placing the city in the lower tier for tap water safety.
How Saint Johns Compares
Data: EPA SDWIS Last verified: 2026-06-03
Who Supplies Your Water in Saint Johns
One utility dominates residential water service in Saint Johns, PA — out of 1 system in federal records.
Overview
We track water quality and home safety data for 1 ZIP code in Saint Johns, Pennsylvania, covering 1 community water system serving approximately 500 people.
No EPA violations recorded across any ZIP codes in Saint Johns — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Saint Johns: D (53/100)
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
Saint Johns water systems draw from: Groundwater.
Lead & Copper
- Lead data: not yet available for Saint Johns
- 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 |
|---|---|---|---|
| 18247 | D | KEYSTONE JOB CORPS CENTER | 500 |
All ZIP Codes in Saint Johns
- 18247 [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.
Flood & Climate Risk in Saint Johns
Although Saint Johns's flood history doesn't reach high-severity thresholds, NFIP data documents 4 claims and FEMA maps place 100% of ZIP codes in designated flood zones — a combined profile that makes flood-related water quality considerations a reasonable planning baseline.
Saint Johns has a moderate flood history with 4 FEMA claims averaging $631 per payout. 100% of ZIP codes fall within FEMA flood zones. Flood events can contaminate drinking water and overwhelm treatment systems.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. Flood damage can add significantly to the estimated <strong>$2,400</strong> remediation cost per household.
Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
What You Can Do in Saint Johns
- 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 Saint Johns, PA