Public water system · NY5105655
ActiveRiverside Water District
At a glance
Riverside Water District (PWSID NY5105655) is an active community water system in Suffolk County, New York. It reports serving 2,050 people through 540 service connections. Its primary water source is purchased groundwater, and EPA lists it as owned by a local government. EPA's records list 2 violations for this system; all are health-based, and the most recent began in December 1983.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
2,050
Service connections
540
Primary source
GWP
Purchased groundwater
System type
CWS
Community water system
System record
How does Riverside Water District compare with other water systems in Suffolk County?
By EPA's size categories, Riverside Water District is a small system (501 to 3,300 people). Suffolk County has 151 active public water systems. Its population served is well below the county average of 9,192 people per system, and accounts for 0.1% of the 1,387,972 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 Riverside Water District 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. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own. 114 New York systems (1.4%) list purchased groundwater as their primary source.
Who owns and regulates Riverside Water District?
EPA lists Riverside Water District 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. 38 of the 151 active systems in Suffolk County (25%) are also owned by a local government.
Does Riverside Water District have drinking water violations?
EPA's records list 2 violations for this system; all are health-based, and the most recent began in December 1983. The violations listed here began between May 1982 and December 1983. By type: 2 contaminant level above the legal limit. The contaminant or rule involved most often is Nitrate (2 of them). EPA lists 2 as archived. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 1983-12-27 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Nitratecode 1040 | Yes | Archived |
| 1982-05-04 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Nitratecode 1040 | Yes | Archived |
All 2 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.
Riverside Water District: frequently asked questions
Who runs Riverside Water District?
Riverside Water District (PWSID NY5105655) is a community water system owned by a local government. It is regulated by the NY state drinking water program.
How many people does Riverside Water District serve?
Riverside Water District reports serving 2,050 people through 540 service connections in Suffolk County, New York.
Where does Riverside Water District get its water?
EPA SDWIS lists this system's primary water source as purchased groundwater. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own.
Does Riverside Water District have any drinking water violations?
EPA's records list 2 violations for this system; all are health-based, and the most recent began in December 1983. 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 Riverside Water District'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 2 violations for this system; all are health-based, and the most recent began in December 1983. For current results, consult the system's annual water quality report, EPA ECHO, or the NY state drinking water program.
Where can I find Riverside Water District's water quality report?
As a community water system, Riverside Water District 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 Suffolk County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Suffolk County Water Authority | Suffolk | 1,100,000 | Community | Groundwater |
| South Huntington Water District | Suffolk | 81,760 | Community | Groundwater |
| Greenlawn Water District | Suffolk | 42,000 | Community | Groundwater |
| Riverhead Water District | Suffolk | 35,000 | Community | Groundwater |
| Dix Hills Water District | Suffolk | 34,522 | Community | Groundwater |
| Smithtown Water District | Suffolk | 19,635 | Community | Purchased 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, “Riverside Water District, PWSID NY5105655, New York”, https://aquacensus.com/water-systems/new-york/riverside-water-district-ny5105655 (data as of October 1, 2026).