Williston Park, NY Water Safety: 90/100 (2026)
1 ZIP code · 3 water systems · Updated 2026-06-03
Williston Park's tap water quality puts it in NY's upper tier — health-based violations are rare and the compliance record is consistently above average.
How Williston Park Compares
Data: EPA SDWIS Last verified: 2026-06-03
Williston Park Water: The Quick Version
- Average lead level: 0.002 mg/L.
- Homes built before 1986: 98% — older plumbing may contain lead solder.
- Estimated remediation: $1,800 per household.
- CDC health risk index: 10.69.
Water Systems Serving Williston Park
3 water utilities share the residential service territory in Williston Park, NY — out of 3 total systems in federal records.
Overview
We track water quality and home safety data for 1 ZIP code in Williston Park, New York (population ~10,378), covering 3 community water systems serving approximately 45,887 people region-wide.
No EPA violations recorded across any ZIP codes in Williston Park — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Williston Park: A (90/100)
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
Williston Park 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)
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 11596 | A | Williston Park (v) | 7,287 |
All ZIP Codes in Williston Park
- 11596 [A]
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 Williston Park
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 Old Is Williston Park's Housing Stock?
With 98% of homes built before 1986, lead solder in plumbing is a potential concern. The EPA banned lead solder in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
While newer cities carry lower aggregate plumbing risk from lead-era construction, Williston Park sits firmly in the older category. The median build year of 1948 indicates that more than half the housing stock was built before 1986, when lead solder was still legally used in residential copper plumbing — and a substantial portion likely predates 1970, when lead pipes were still commonly installed for service lines. These two thresholds together define the elevated plumbing risk environment that older housing cities carry, independent of what the municipal water supply delivers to the meter.
Over half of homes in Williston Park were built before 1986, when lead solder was banned. Older plumbing may leach lead into drinking water, especially with corrosive water chemistry.
Source: U.S. Census Bureau ACS B25034.
Williston Park: Remediation Cost in Perspective
Property equity in Williston Park runs well ahead of estimated remediation costs — a cost-to-value ratio that sits in the low tier, meaning documented water and safety issues here are the kind homeowners can plan to address without treating the expense as a significant budget event relative to what their homes are worth.
Remediation costs in Williston Park are relatively low compared to home values. The $1,200–$2,600 estimated range is a small fraction of median property value. Home values are 121% above the New York average.
Protecting Children from Lead in Williston Park
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.
Wherever 98% of local housing was built before solder rules changed — as is the case in Williston Park — a faucet-level sample closes the gap that aggregate utility data cannot.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Climate-Related Water Risk for Williston Park
Williston Park's flood exposure sits in the moderate range: 12 NFIP claims on record and 100% of ZIP codes within FEMA-designated flood zones. Residents with private wells or older infrastructure have reasonable grounds to factor flood timing into their water quality awareness.
Williston Park has a moderate flood history with 12 FEMA claims averaging $7,589 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>$1,800</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 Williston Park, NY