Public water system · WA5315400
ActiveCoulee Dam Water Dept
At a glance
Coulee Dam Water Dept (PWSID WA5315400) is an active community water system in Okanogan County, Washington. It reports serving 1,454 people through 628 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. EPA's records list 3 violations for this system; 1 is health-based, and the most recent began in July 2015.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,454
Service connections
628
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Coulee Dam Water Dept compare with other water systems in Okanogan County?
By EPA's size categories, Coulee Dam Water Dept is a small system (501 to 3,300 people). Okanogan County has 119 active public water systems. Its population served is about 3.8 times the county average of 383 people per system, and accounts for 3.2% of the 45,608 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 Coulee Dam Water Dept 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. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 140 Washington systems (3%) list surface water as their primary source.
Who owns and regulates Coulee Dam Water Dept?
EPA lists Coulee Dam Water Dept 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. 16 of the 119 active systems in Okanogan County (13%) are also owned by a local government.
Does Coulee Dam Water Dept have drinking water violations?
EPA's records list 3 violations for this system; 1 is health-based, and the most recent began in July 2015. The violations listed here began between January 1992 and July 2015. By type: 2 public notice, recordkeeping or other and 1 required treatment not met. The contaminant or rule involved most often is Consumer Confidence Rule (2 of them). EPA lists 3 as resolved. 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 |
|---|---|---|---|---|
| 2015-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 1999-10-19 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 1992-01-01 | Required treatment not metFailure to Filter (SWTR) · code 42 | Surface Water Treatment Rulecode 0200 | Yes | Resolved |
All 3 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.
Coulee Dam Water Dept: frequently asked questions
Who runs Coulee Dam Water Dept?
Coulee Dam Water Dept (PWSID WA5315400) is a community water system owned by a local government. It is regulated by the WA state drinking water program.
How many people does Coulee Dam Water Dept serve?
Coulee Dam Water Dept reports serving 1,454 people through 628 service connections in Okanogan County, Washington.
Where does Coulee Dam Water Dept 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 Coulee Dam Water Dept have any drinking water violations?
EPA's records list 3 violations for this system; 1 is health-based, and the most recent began in July 2015. 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 Coulee Dam Water Dept'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 3 violations for this system; 1 is health-based, and the most recent began in July 2015. For current results, consult the system's annual water quality report, EPA ECHO, or the WA state drinking water program.
Where can I find Coulee Dam Water Dept's water quality report?
As a community water system, Coulee Dam Water Dept 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 Okanogan County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Omak City of | Okanogan | 4,940 | Community | Groundwater |
| Brewster City of | Okanogan | 3,843 | Community | Groundwater |
| Okanogan Water Department City of | Okanogan | 3,817 | Community | Groundwater |
| Oroville City of | Okanogan | 3,256 | Community | Groundwater |
| Tonasket Water System | Okanogan | 2,398 | Community | Groundwater |
| Pearrygin Lake State Park - Both Cg | Okanogan | 2,103 | 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, “Coulee Dam Water Dept, PWSID WA5315400, Washington”, https://aquacensus.com/water-systems/washington/coulee-dam-water-dept-wa5315400 (data as of October 1, 2026).