Public water system · NY4100042
ActiveNassau (V) Pws
At a glance
Nassau (V) Pws (PWSID NY4100042) is an active community water system in Rensselaer County, New York. It reports serving 1,250 people through 580 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 5 violations for this system; none is health-based, and the most recent began in January 2014.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,250
Service connections
580
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Nassau (V) Pws compare with other water systems in Rensselaer County?
By EPA's size categories, Nassau (V) Pws is a small system (501 to 3,300 people). Rensselaer County has 146 active public water systems. Its population served is about 35% above the county average of 926 people per system, and accounts for 0.9% of the 135,123 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 Nassau (V) Pws is well below 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 Nassau (V) Pws?
EPA lists Nassau (V) Pws as owned by a local government. 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. 24 of the 146 active systems in Rensselaer County (16%) are also owned by a local government.
Does Nassau (V) Pws have drinking water violations?
EPA's records list 5 violations for this system; none is health-based, and the most recent began in January 2014. The violations listed here began between September 1993 and January 2014. By type: 3 public notice, recordkeeping or other and 2 monitoring and reporting. The contaminants or rules involved are Nitrate and Total coliform bacteria (TCR). EPA lists 5 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 |
|---|---|---|---|---|
| 2014-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2013-03-01 | Public notice, recordkeeping or otherOperations Report · code 10 | Not reported | No | Resolved |
| 2012-08-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1994-06-01 | Public notice, recordkeeping or otherOperations Report · code 10 | Not reported | No | Resolved |
| 1993-09-01 | Public notice, recordkeeping or otherOperations Report · code 10 | Not reported | No | Resolved |
All 5 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.
Nassau (V) Pws: frequently asked questions
Who runs Nassau (V) Pws?
Nassau (V) Pws (PWSID NY4100042) is a community water system owned by a local government. It is regulated by the NY state drinking water program.
How many people does Nassau (V) Pws serve?
Nassau (V) Pws reports serving 1,250 people through 580 service connections in Rensselaer County, New York.
Where does Nassau (V) Pws 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 Nassau (V) Pws have any drinking water violations?
EPA's records list 5 violations for this system; none is health-based, and the most recent began in January 2014. 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 Nassau (V) Pws' 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 5 violations for this system; none is health-based, and the most recent began in January 2014. For current results, consult the system's annual water quality report, EPA ECHO, or the NY state drinking water program.
Where can I find Nassau (V) Pws' water quality report?
As a community water system, Nassau (V) Pws 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 Rensselaer County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Troy City Pws | Rensselaer | 51,401 | Community | Surface water |
| East Greenbush General W.D. | Rensselaer | 15,843 | Community | Purchased surface water |
| North Greenbush Consolidated District | Rensselaer | 10,226 | Community | Purchased surface water |
| Rensselaer City Pws | Rensselaer | 9,300 | Community | Purchased surface water |
| Brunswick Consolidated Water District | Rensselaer | 7,050 | Community | Purchased surface water |
| Hoosick Falls (V) Pws | Rensselaer | 4,925 | 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, “Nassau (V) Pws, PWSID NY4100042, New York”, https://aquacensus.com/water-systems/new-york/nassau-v-pws-ny4100042 (data as of October 1, 2026).