Public water system · NY4404389
ActiveMadrid Water District
At a glance
Madrid Water District (PWSID NY4404389) is an active community water system in St. Lawrence County, New York. It reports serving 800 people through 265 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 6 violations for this system; none is health-based, and the most recent began in January 2021.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
800
Service connections
265
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Madrid Water District compare with other water systems in St. Lawrence County?
By EPA's size categories, Madrid Water District is a small system (501 to 3,300 people). St. Lawrence County has 229 active public water systems. Its population served is about 126% above the county average of 354 people per system, and accounts for 1% of the 81,125 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 Madrid 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. 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 Madrid Water District?
EPA lists Madrid 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. 34 of the 229 active systems in St. Lawrence County (15%) are also owned by a local government.
Does Madrid Water District have drinking water violations?
EPA's records list 6 violations for this system; none is health-based, and the most recent began in January 2021. The violations listed here began between January 1994 and January 2021. By type: 3 monitoring and reporting and 3 public notice, recordkeeping or other. The contaminants or rules involved are Haloacetic acids (HAA5), Total trihalomethanes (TTHM) and Nitrate. EPA lists 5 as resolved and 1 as archived. 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. 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 |
|---|---|---|---|---|
| 2021-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2021-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2000-11-01 | Public notice, recordkeeping or otherOperations Report · code 10 | Not reported | No | Resolved |
| 2000-09-01 | Public notice, recordkeeping or otherOperations Report · code 10 | Not reported | No | Resolved |
| 1997-12-01 | Public notice, recordkeeping or otherOperations Report · code 10 | Not reported | No | Resolved |
| 1994-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Archived |
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.
Madrid Water District: frequently asked questions
Who runs Madrid Water District?
Madrid Water District (PWSID NY4404389) is a community water system owned by a local government. It is regulated by the NY state drinking water program.
How many people does Madrid Water District serve?
Madrid Water District reports serving 800 people through 265 service connections in St. Lawrence County, New York.
Where does Madrid Water District 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 Madrid Water District have any drinking water violations?
EPA's records list 6 violations for this system; none is health-based, and the most recent began in January 2021. 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 Madrid 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 6 violations for this system; none is health-based, and the most recent began in January 2021. For current results, consult the system's annual water quality report, EPA ECHO, or the NY state drinking water program.
Where can I find Madrid Water District's water quality report?
As a community water system, Madrid 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 St. Lawrence County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Massena Village | St. Lawrence | 16,729 | Community | Surface water |
| Ogdensburg City | St. Lawrence | 10,064 | Community | Surface water |
| Potsdam Village | St. Lawrence | 8,312 | Community | Surface water |
| Canton Village | St. Lawrence | 7,055 | Community | Groundwater |
| Gouverneur | St. Lawrence | 4,263 | Community | Surface water |
| East Louisville Water District | St. Lawrence | 3,235 | Community | Surface water |
Related pages
Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “Madrid Water District, PWSID NY4404389, New York”, https://aquacensus.com/water-systems/new-york/madrid-water-district-ny4404389 (data as of October 1, 2026).