Public water system · ME0091550
ActiveVinalhaven Water District
At a glance
Vinalhaven Water District (PWSID ME0091550) is an active community water system in Knox County, Maine. It reports serving 1,053 people through 421 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 9 are health-based, and the most recent began in September 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,053
Service connections
421
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Vinalhaven Water District compare with other water systems in Knox County?
By EPA's size categories, Vinalhaven Water District is a small system (501 to 3,300 people). Knox County has 46 active public water systems, and Vinalhaven Water District is the 3rd-largest of them by population served. Its population served is about 58% above the county average of 666 people per system, and accounts for 3.4% of the 30,632 people reported by systems filed under the county. Across Maine, the 1,862 active systems average 503 people each. Nationally, the average active community water system reports serving 6,703 people, so Vinalhaven 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. Maine has 386 active community water systems, 21% of the state's 1,862 active systems. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 61 Maine systems (3.3%) list surface water as their primary source.
Who owns and regulates Vinalhaven Water District?
EPA lists Vinalhaven Water District as owned by a local government. The ME state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 9 of the 46 active systems in Knox County (20%) are also owned by a local government.
Does Vinalhaven Water District have drinking water violations?
Of the 12 most recent violations in EPA's records, 9 are health-based, and the most recent began in September 2025. The violations listed here began between January 2011 and September 2025. By type: 9 contaminant level above the legal limit and 3 monitoring and reporting. The contaminant or rule involved most often is Total trihalomethanes (TTHM) (10 of them). EPA lists 11 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 |
|---|---|---|---|---|
| 2025-09-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Archived |
| 2025-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2025-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2024-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2024-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2024-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2024-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2023-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2022-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2022-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2011-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2011-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
The 12 most recent 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.
Vinalhaven Water District: frequently asked questions
Who runs Vinalhaven Water District?
Vinalhaven Water District (PWSID ME0091550) is a community water system owned by a local government. It is regulated by the ME state drinking water program.
How many people does Vinalhaven Water District serve?
Vinalhaven Water District reports serving 1,053 people through 421 service connections in Knox County, Maine.
Where does Vinalhaven Water District get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does Vinalhaven Water District have any drinking water violations?
Of the 12 most recent violations in EPA's records, 9 are health-based, and the most recent began in September 2025. 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 Vinalhaven 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. Of the 12 most recent violations in EPA's records, 9 are health-based, and the most recent began in September 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the ME state drinking water program.
Where can I find Vinalhaven Water District's water quality report?
As a community water system, Vinalhaven 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 Knox County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Maine Water Company Camden & Rockland | Knox | 21,315 | Community | Surface water |
| Mdoc State Park-Camden Hills | Knox | 1,573 | Transient non-community | Groundwater |
| Maine Water Company Warren Division | Knox | 815 | Community | Groundwater |
| North Haven Water Department | Knox | 740 | Community | Surface water |
| Tenants Harbor Water District | Knox | 378 | Community | Groundwater |
| Port Clyde Water District | Knox | 330 | 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, “Vinalhaven Water District, PWSID ME0091550, Maine”, https://aquacensus.com/water-systems/maine/vinalhaven-water-district-me0091550 (data as of October 1, 2026).