Syosset, NY Water Safety: 95/100 (2026)
2 ZIP codes · 4 water systems · Updated 2026-06-03
How does Syosset tap water hold up under EPA scrutiny? Above average for NY — documented violations are uncommon and the safety grade reflects a clean overall record.
How Syosset Compares
Data: EPA SDWIS Last verified: 2026-06-03
Syosset Water: The Quick Version
- Average lead level: 0.002 mg/L.
- Estimated remediation: $1,700 per household.
- CDC health risk index: 10.69.
Water Systems Serving Syosset
At present, 3 utilities serve the bulk of Syosset, NY's residential water connections out of 4 systems active in the area, spread across independent providers with separate infrastructure and compliance obligations.
Overview
We track water quality and home safety data for 2 ZIP codes in Syosset, New York (population ~25,194), covering 4 community water systems serving approximately 153,400 people region-wide.
No EPA violations recorded across any ZIP codes in Syosset — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Syosset: A (95/100)
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
Syosset water systems draw from: Groundwater.
Lead & Copper
- Average lead level (90th percentile): 0.0020 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 3 (Low Risk)
- Zone 1 (High): 0 ZIP codes
- Zone 2 (Moderate): 0 ZIP codes
- Zone 3 (Low): 2 ZIP codes
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 11773 | A | Jericho Water District | 58,000 |
| 11791 | A | Jericho Water District | 58,000 |
All ZIP Codes in Syosset
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.
CDC Health Data for Syosset
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
Syosset: Remediation Cost in Perspective
What does remediation cost in financial context for Syosset homeowners? Proportionally very little — the equity share here is low, and addressing documented issues is a manageable planning question rather than a material financial burden.
Remediation costs in Syosset are relatively low compared to home values. The $1,100–$2,600 estimated range is a small fraction of median property value. Home values are 154% above the New York average.
Protecting Children from Lead in Syosset
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 Syosset 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.
Climate-Related Water Risk for Syosset
Over the multi-decade window covered by the National Flood Insurance Program, Syosset has accumulated 34 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.
Syosset has a moderate flood history with 34 FEMA claims averaging $1,371 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>$1,700</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.
Deep Dive Reports
Detailed analysis for Syosset, NY