Water Authority of Western Nassau
EPA ID: NY2902830 · 120,000 people served · 7 ZIP codes
ZipCheckup's reading of EPA records for Water Authority of Western Nassau (NY2902830): no drinking-water violations recorded since 2021. Violation-free in EPA records - Water Authority of Western Nassau, 120,000 residents served.
Data: EPA SDWIS
Service Area Map
Coverage area for Water Authority of Western Nassau Source: EPA SDWIS service area boundaries.
Service area boundary - average Home Safety grade of mapped ZIPs: B
Demographics of ZIP Codes Served
The ZIP codes associated with Water Authority of Western Nassau have a median household income of $142,721 and about 209,309 residents live in those ZIP codes (Census; not the number of people this system supplies). Approximately 93% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Water Authority of Western Nassau's water is classified in EPA records as a groundwater source. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
Superfund Proximity Note: This service area ranks in the 83th percentile nationally for proximity to Superfund (NPL) sites. Groundwater sources near contaminated sites may face elevated risk from industrial chemicals.
Infrastructure Risk
PFAS in ZIP Codes This System Serves
PFAS ("forever chemicals") have been reported in samples from water systems associated with the ZIP codes in this system's area. These results can come from other water systems serving the same ZIP codes; check the UCMR5 section for any results reported for this system. 56 detections recorded. 15 detections are above the level of a federal PFAS MCL (4 ppt for PFOA and PFOS), with compliance required from 2029.
Comparable Water Systems
Similar-sized systems in New York
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
Water Authority of Western Nassau (EPA ID: NY2902830) is a community water system in New York that serves approximately 120,000 people from groundwater sources.
This system provides water to 7 ZIP codes across 6 communities.
ZIP-Area Home Safety Context: B (74/100)
This is the average Home Safety Score for 3 of 7 service-area ZIP codes with all required score domains observed. It is not a grade for the water utility.
Model 4.0.0 uses SDWIS identity plus accepted ECHO SDWA lifecycle-based water compliance, the UCMR 5 PFAS MCL screen, EPA radon zone, and annual EPA AirData AQI across three equally weighted domains. Missing required evidence suppresses the score.
Violation History
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.0014 mg/L | No | 2024-12-31 |
No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.
Radon Risk in Service Area
7 of 7 ZIP records with known zones are in EPA Radon Zone 3.
The EPA recommends testing all homes regardless of radon zone. County radon zones cannot replace an in-home radon test.
ZIP Codes Served
Coverage: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by NY or modeled from parcel and building-footprint data.
- 11001 - Floral Park
- 11003 - Elmont
- 11010 - Franklin Square
- 11040 - New Hyde Park
- 11042 - New Hyde Park
- 11530 - Garden City
- 11580 - Valley Stream
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Water Authority of Western Nassau (NY2902830) on EPA.gov.
Frequently Asked Questions
Is Water Authority of Western Nassau water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for Water Authority of Western Nassau in the inclusive 2021-2026 record-year window. This is a compliance-record finding, not a guarantee about water at a specific tap.
How many people does Water Authority of Western Nassau serve?
Water Authority of Western Nassau serves approximately 120,000 people across 7 ZIP codes in New York.
Where does Water Authority of Western Nassau get its water?
The primary water source is groundwater.
Federal UCMR5 PFAS Monitoring: Sample Above an EPA MCL Value or State Standard
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). One or more PFAS measurements were above the level of the EPA MCL for that compound (April 2024 rule, which takes effect in 2029) or above an applicable state drinking-water standard; a monitoring result above that level is not by itself a violation.
EPA's April 2024 PFAS rule sets MCLs of 4 ppt for PFOA and PFOS and 10 ppt for PFHxS, PFNA and HFPO-DA (GenX); water systems must comply from 2029. Other PFAS compounds have no individual federal MCL. A state standard is shown only where this system's state has its own enforceable PFAS limit. Detection results are EPA UCMR5 samples, not a measurement at your tap.
Source: U.S. EPA UCMR5 (Unregulated Contaminant Monitoring Rule, 5th cycle) — per-system federal sampling, 2023–2025. EPA UCMR5 monitoring program →
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Water Authority of Western Nassau, NY: Serves 120K People. https://zipcheckup.com/water-system/ny2902830/
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