Public water system · WA5392480
ActiveRosario Beach Marine Laboratory
At a glance
Rosario Beach Marine Laboratory (PWSID WA5392480) is an active transient non-community water system in Skagit County, Washington. It reports serving 85 people through 48 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 10 violations for this system; 6 are health-based, and the most recent began in January 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
85
Service connections
48
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Rosario Beach Marine Laboratory compare with other water systems in Skagit County?
By EPA's size categories, Rosario Beach Marine Laboratory is a very small system (500 people or fewer). Skagit County has 85 active public water systems. Its population served is well below the county average of 1,874 people per system, and accounts for less than 0.1% of the 159,261 people reported by systems filed under the county. Across Washington, the 4,705 active systems average 2,172 people each. Nationally, the average active transient non-community water system reports serving 144 people, so Rosario Beach Marine Laboratory is about 41% below that figure.
What does “transient non-community water system” mean?
A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. Washington has 1,913 active transient non-community water systems, 41% 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 Rosario Beach Marine Laboratory?
EPA lists Rosario Beach Marine Laboratory as privately owned. 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. 68 of the 85 active systems in Skagit County (80%) are also privately owned.
Does Rosario Beach Marine Laboratory have drinking water violations?
EPA's records list 10 violations for this system; 6 are health-based, and the most recent began in January 2025. The violations listed here began between May 1996 and January 2025. By type: 6 contaminant level above the legal limit and 4 monitoring and reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (7 of them). EPA lists 7 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 |
|---|---|---|---|---|
| 2025-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2020-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2007-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2006-12-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 2000-06-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 1997-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 1996-12-01 | Monitoring and reportingMonitoring, Repeat Major (TCR) · code 25 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1996-11-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 1996-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 1996-05-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
All 10 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.
Rosario Beach Marine Laboratory: frequently asked questions
Who runs Rosario Beach Marine Laboratory?
Rosario Beach Marine Laboratory (PWSID WA5392480) is a transient non-community water system privately owned. It is regulated by the WA state drinking water program.
How many people does Rosario Beach Marine Laboratory serve?
Rosario Beach Marine Laboratory reports serving 85 people through 48 service connections in Skagit County, Washington.
Where does Rosario Beach Marine Laboratory 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 Rosario Beach Marine Laboratory have any drinking water violations?
EPA's records list 10 violations for this system; 6 are health-based, and the most recent began in January 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 Rosario Beach Marine Laboratory'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 10 violations for this system; 6 are health-based, and the most recent began in January 2025. For current results, consult EPA ECHO, or the WA state drinking water program.
Where can I find Rosario Beach Marine Laboratory's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Rosario Beach Marine Laboratory is a transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.
Other water systems in Skagit County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Skagit County PUD 1 Judy Res | Skagit | 111,415 | Community | Surface water |
| Anacortes City of | Skagit | 25,109 | Community | Surface water |
| Shelter Bay Community Inc. | Skagit | 2,212 | Community | Purchased surface water |
| Skagit Co Water District #1 | Skagit | 1,974 | Community | Groundwater |
| La Conner Water Dept | Skagit | 1,821 | Community | Purchased surface water |
| Blanchard Edison Water Assn. Inc.. | Skagit | 1,480 | 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, “Rosario Beach Marine Laboratory, PWSID WA5392480, Washington”, https://aquacensus.com/water-systems/washington/rosario-beach-marine-laboratory-wa5392480 (data as of October 1, 2026).