Water Authority of Western Nassau
EPA ID: NY2902830 · 120,000 people served · 13 ZIP codes
For the full five-year period covered by EPA monitoring, Water Authority of Western Nassau has supplied tap water to 120,000 residents with no violations of any type on record.
Data: EPA SDWIS Last verified: 2026-04-02
Compliance Trajectory
Stable · Risk tier: High · 95% chance of violation in next 12 months
Violations went from 1 (2023) to 2 (2024). Violation counts have remained relatively steady.
Service Area Map
Coverage area for Water Authority of Western Nassau Source: EPA SDWIS service area boundaries.
Service area boundary — Grade B
Service Area Demographics
The Water Authority of Western Nassau serves a community with a median household income of $129,193 and an estimated 290,074 residents across its service area. Approximately 95% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: 31% of the population in this service area is classified as disadvantaged under EPA's EJScreen criteria. Communities with higher disadvantaged populations often face disproportionate environmental and health burdens, including aging water infrastructure and limited resources for remediation.
💧 Where Does Your Water Come From?
Water Authority of Western Nassau's water is pumped from underground aquifers. 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.
About 1% of homes in Queens County, New York rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
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 Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 56 detections recorded. 15 exceed federal EPA limits (4 ppt for PFOA/PFOS). 1 exceeds state limits.
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
WA 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 13 ZIP codes across 9 communities.
Average Home Safety Score: B (82/100)
Based on water quality violations, lead levels, and radon risk across all ZIP codes served by this system.
Violation History
Lead & Copper
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
| ZIP Code | Lead Level | Exceeds Limit | Sample Date |
|---|---|---|---|
| 11040 | 0.0014 mg/L | No | N/A |
| 11041 | 0.0014 mg/L | No | N/A |
| 11042 | 0.0014 mg/L | No | N/A |
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 3 (Low Risk)
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
Coverage: 7 ZIP codes confirmed via EPA Community Water System Service Area Boundaries v3 plus 6 additional ZIPs inferred from SDWIS registry data. The EPA-confirmed set is the most reliable; SDWIS-inferred entries may be narrower than the real deployment area.
- 11001 — Floral Park
- 11002 — Floral Park
- 11003 — Elmont
- 11004 — Glen Oaks
- 11010 — Franklin Square
- 11040 — New Hyde Park
- 11041 — New Hyde Park
- 11042 — New Hyde Park
- 11426 — Bellerose
- 11428 — Queens Village
- 11429 — Queens Village
- 11530 — Garden City
- 11580 — Valley Stream
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Water Authority of Western Nassau (NY2902830) on EPA.gov.
Frequently Asked Questions
Is Water Authority of Western Nassau water safe to drink?
Based on EPA records, Water Authority of Western Nassau has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Water Authority of Western Nassau serve?
Water Authority of Western Nassau serves approximately 120,000 people across 13 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: Detected
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). PFAS compounds were detected below the current state-enforceable MCL.
Current MCL reflects the lowest state-enforceable limit (NYS 10 ppt for PFOA/PFOS, effective August 2020). The federal final MCL of 4 ppt for PFOA/PFOS (EPA April 2024 rule) is not enforceable until April 2029. Detections above 4 ppt but below 10 ppt are below current MCL but above the future federal limit.
Source: U.S. EPA UCMR5 (Unregulated Contaminant Monitoring Rule, 5th cycle) — per-system federal sampling, 2023–2025. EPA UCMR5 monitoring program →
Lead Service Line Inventory
Service line breakdown reported under the federal Lead and Copper Rule Improvements (LCRI) inventory requirement:
Federal LCRI rule (effective October 2024) requires every public water system to inventory its service lines and complete lead-line replacement within 10 years.
Source: EPA SDWIS Federal Service Line Inventory (Phase 2) · Submitted 2026
ZipCheckup is not affiliated with the utility or state agency. Inventory figures render verbatim from the public LCRI submission cited above; ZipCheckup does not perform inspections or replacements.