Stony Brook, NY: High Radon Risk — 43/100 (2026)
2 ZIP codes · 2 water systems · Updated 2026-06-03
Compared to NY averages, Stony Brook scores below the baseline — health violations appear more frequently than the norm and the city's grade reflects that ongoing shortfall.
How Stony Brook Compares
Data: EPA SDWIS Last verified: 2026-06-03
Key Facts for Stony Brook Residents
- Estimated remediation: $2,400 per household.
- CDC health risk index: 11.13.
Stony Brook's Water Providers
2 independent water providers serve Stony Brook, NY — 2 systems appear in federal records.
Overview
We track water quality and home safety data for 2 ZIP codes in Stony Brook, New York (population ~21,453), covering 2 community water systems serving approximately 1,100,150 people region-wide.
No EPA violations recorded across any ZIP codes in Stony Brook — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Stony Brook: D (43/100)
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
Stony Brook water systems draw from: Groundwater.
Lead & Copper
- Lead data: not yet available for Stony Brook
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 1 (High Risk)
- Zone 1 (High): 2 ZIP codes
- Zone 2 (Moderate): 0 ZIP codes
- Zone 3 (Low): 0 ZIP codes
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 11790 | D | SUFFOLK COUNTY WATER AUTHORITY | 1,100,000 |
| 11794 | D | SUFFOLK COUNTY WATER AUTHORITY | 1,100,000 |
All ZIP Codes in Stony Brook
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.
Stony Brook Community Health Snapshot
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
How Remediation Costs Compare in Stony Brook
In Stony Brook, property wealth outpaces what documented remediation typically demands — the equity burden lands well within the low tier.
Remediation costs in Stony Brook are relatively low compared to home values. The $1,600–$3,150 estimated range is a small fraction of median property value. Home values are 63% above the New York average.
Stony Brook: Flood History & Water Damage Risk
Over the multi-decade window covered by the National Flood Insurance Program, Stony Brook has accumulated 49 claims — a total that suggests more than isolated flood exposure. With 50% of ZIP codes in designated flood zones, the water-quality implications of flooding move from hypothetical to periodically relevant: treatment intake can be compromised, wells can be infiltrated, and distribution backflow can occur.
Stony Brook has a moderate flood history with 49 FEMA claims averaging $24,087 per payout. 50% 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 Stony Brook
- 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 Stony Brook, NY