Public water system · WA5312911
ActiveMackaye Harbor Water District
At a glance
Mackaye Harbor Water District (PWSID WA5312911) is an active community water system in San Juan County, Washington. It reports serving 133 people through 53 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 7 violations for this system; 2 are health-based, and the most recent began in July 2021.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
133
Service connections
53
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Mackaye Harbor Water District compare with other water systems in San Juan County?
By EPA's size categories, Mackaye Harbor Water District is a very small system (500 people or fewer). San Juan County has 112 active public water systems. Its population served is about 63% below the county average of 361 people per system, and accounts for 0.3% of the 40,377 people reported by systems filed under the county. Across Washington, the 4,705 active systems average 2,172 people each. Nationally, the average active community water system reports serving 6,703 people, so Mackaye Harbor 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. Washington has 2,392 active community water systems, 51% of the state's 4,705 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 4,370 Washington systems (93%) list groundwater as their primary source.
Who owns and regulates Mackaye Harbor Water District?
EPA lists Mackaye Harbor Water District as owned by a local government. The WA 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 112 active systems in San Juan County (8%) are also owned by a local government.
Does Mackaye Harbor Water District have drinking water violations?
EPA's records list 7 violations for this system; 2 are health-based, and the most recent began in July 2021. The violations listed here began between July 1992 and July 2021. By type: 3 monitoring and reporting, 2 public notice, recordkeeping or other and 2 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (4 of them). EPA lists 4 as archived and 3 as resolved. 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. 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 |
|---|---|---|---|---|
| 2021-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2017-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2014-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2000-05-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1992-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 1992-08-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1992-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
All 7 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.
Mackaye Harbor Water District: frequently asked questions
Who runs Mackaye Harbor Water District?
Mackaye Harbor Water District (PWSID WA5312911) is a community water system owned by a local government. It is regulated by the WA state drinking water program.
How many people does Mackaye Harbor Water District serve?
Mackaye Harbor Water District reports serving 133 people through 53 service connections in San Juan County, Washington.
Where does Mackaye Harbor 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 Mackaye Harbor Water District have any drinking water violations?
EPA's records list 7 violations for this system; 2 are health-based, and the most recent began in July 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 Mackaye Harbor 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 7 violations for this system; 2 are health-based, and the most recent began in July 2021. For current results, consult the system's annual water quality report, EPA ECHO, or the WA state drinking water program.
Where can I find Mackaye Harbor Water District's water quality report?
As a community water system, Mackaye Harbor 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 San Juan County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Moran State Park-Mountain Lake | San Juan | 4,804 | Transient non-community | Surface water |
| Moran State Park - Summit Lake | San Juan | 4,803 | Transient non-community | Groundwater under influence of surface water |
| Moran State Park-Cascade Lake | San Juan | 4,783 | Transient non-community | Surface water |
| Eastsound Water Users Association | San Juan | 3,711 | Community | Surface water |
| Friday Harbor Town of | San Juan | 3,543 | Community | Surface water |
| Limekiln State Park | San Juan | 2,149 | Transient non-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, “Mackaye Harbor Water District, PWSID WA5312911, Washington”, https://aquacensus.com/water-systems/washington/mackaye-harbor-water-district-wa5312911 (data as of October 1, 2026).