Public water system · NY2902830
ActiveWa of Western Nassau
At a glance
Wa of Western Nassau (PWSID NY2902830) is an active community water system in Nassau County, New York. It reports serving 120,000 people through 27,875 service connections. Its primary water source is groundwater, and EPA lists it as under public/private ownership. EPA's records list 6 violations for this system; 1 is health-based, and the most recent began in October 2018.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
120,000
Service connections
27,875
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Wa of Western Nassau compare with other water systems in Nassau County?
By EPA's size categories, Wa of Western Nassau is a very large system (more than 100,000 people). Nassau County has 44 active public water systems, and Wa of Western Nassau is the 3rd-largest of them by population served. Its population served is about 3.8 times the county average of 31,534 people per system, and accounts for 8.6% of the 1,387,479 people reported by systems filed under the county. Across New York, the 8,167 active systems average 2,374 people each. Nationally, the average active community water system reports serving 6,703 people, so Wa of Western Nassau is about 18 times that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. New York has 2,281 active community water systems, 28% of the state's 8,167 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 7,096 New York systems (87%) list groundwater as their primary source.
Who owns and regulates Wa of Western Nassau?
EPA lists Wa of Western Nassau as under public/private ownership. The NY state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 16 of the 44 active systems in Nassau County (36%) are also under public/private ownership.
Does Wa of Western Nassau have drinking water violations?
EPA's records list 6 violations for this system; 1 is health-based, and the most recent began in October 2018. The violations listed here began between April 2004 and October 2018. By type: 5 monitoring and reporting and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (2 of them). EPA lists 6 as resolved. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2018-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Combined Radium (-226 and -228)code 4010 | No | Resolved |
| 2011-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Acute (TCR) · code 21 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2009-06-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2004-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitritecode 1041 | No | Resolved |
| 2004-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2004-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
All 6 violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Wa of Western Nassau: frequently asked questions
Who runs Wa of Western Nassau?
Wa of Western Nassau (PWSID NY2902830) is a community water system under public/private ownership. It is regulated by the NY state drinking water program.
How many people does Wa of Western Nassau serve?
Wa of Western Nassau reports serving 120,000 people through 27,875 service connections in Nassau County, New York.
Where does Wa of Western Nassau get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Wa of Western Nassau have any drinking water violations?
EPA's records list 6 violations for this system; 1 is health-based, and the most recent began in October 2018. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Wa of Western Nassau's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. EPA's records list 6 violations for this system; 1 is health-based, and the most recent began in October 2018. For current results, consult the system's annual water quality report, EPA ECHO, or the NY state drinking water program.
Where can I find Wa of Western Nassau's water quality report?
As a community water system, Wa of Western Nassau must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Nassau County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Liberty Utilities New York - Lynbrook | Nassau | 220,000 | Community | Groundwater |
| Liberty Utilities New York - Merrick | Nassau | 135,000 | Community | Groundwater |
| Town of Hempstead Water Department | Nassau | 110,000 | Community | Groundwater |
| Jericho Wd | Nassau | 58,000 | Community | Groundwater |
| Hempstead (V) | Nassau | 56,000 | Community | Groundwater |
| Hicksville Wd | Nassau | 48,000 | Community | Groundwater |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Wa of Western Nassau, PWSID NY2902830, New York”, https://aquacensus.com/water-systems/new-york/wa-of-western-nassau-ny2902830 (data as of October 1, 2026).