Public water system · WA5377620
ActiveSequim City of
At a glance
City of Sequim (PWSID WA5377620) is an active community water system in Clallam County, Washington. It reports serving 14,293 people through 4,453 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 11 violations for this system; none is health-based, and the most recent began in July 2024.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
14,293
Service connections
4,453
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does City of Sequim compare with other water systems in Clallam County?
By EPA's size categories, City of Sequim is a large system (10,001 to 100,000 people). Clallam County has 100 active public water systems, and City of Sequim is the 2nd-largest of them by population served. Its population served is about 16 times the county average of 879 people per system, and accounts for 16% of the 87,933 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 City of Sequim is about twice 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 City of Sequim?
EPA lists City of Sequim 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. 12 of the 100 active systems in Clallam County (12%) are also owned by a local government.
Does City of Sequim have drinking water violations?
EPA's records list 11 violations for this system; none is health-based, and the most recent began in July 2024. The violations listed here began between October 1979 and July 2024. By type: 9 monitoring and reporting and 2 public notice, recordkeeping or other. The contaminant or rule involved most often is Consumer Confidence Rule (2 of them). EPA lists 9 as archived and 2 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 |
|---|---|---|---|---|
| 2024-07-01 | 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 |
| 1979-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Seleniumcode 1045 | No | Archived |
| 1979-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Cadmiumcode 1015 | No | Archived |
| 1979-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Chromiumcode 1020 | No | Archived |
| 1979-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Archived |
| 1979-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Arseniccode 1005 | No | Archived |
| 1979-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Archived |
| 1979-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Bariumcode 1010 | No | Archived |
| 1979-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Mercurycode 1035 | No | Archived |
| 1979-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Fluoridecode 1025 | No | Archived |
All 11 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.
City of Sequim: frequently asked questions
Who runs City of Sequim?
City of Sequim (PWSID WA5377620) is a community water system owned by a local government. It is regulated by the WA state drinking water program.
How many people does City of Sequim serve?
City of Sequim reports serving 14,293 people through 4,453 service connections in Clallam County, Washington.
Where does City of Sequim 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 City of Sequim have any drinking water violations?
EPA's records list 11 violations for this system; none is health-based, and the most recent began in July 2024. 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 City of Sequim'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 11 violations for this system; none is health-based, and the most recent began in July 2024. For current results, consult the system's annual water quality report, EPA ECHO, or the WA state drinking water program.
Where can I find City of Sequim's water quality report?
As a community water system, City of Sequim 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 Clallam County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Port Angeles City of | Clallam | 28,067 | Community | Surface water |
| Port Angeles Composite | Clallam | 8,872 | Community | Surface water |
| Forks Municipal Water Dept | Clallam | 3,468 | Community | Groundwater |
| Dry Creek Water Association | Clallam | 3,030 | Community | Groundwater |
| West Sequim Bay Inc. | Clallam | 2,759 | Community | Groundwater |
| Crescent Water Assn | Clallam | 2,360 | Community | Surface water |
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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, “Sequim City of, PWSID WA5377620, Washington”, https://aquacensus.com/water-systems/washington/sequim-city-of-wa5377620 (data as of October 1, 2026).