Public water system · WA5312521
ActiveSeattle City Light-Boundary Dam
At a glance
Seattle City Light-Boundary Dam (PWSID WA5312521) is an active non-transient non-community water system in Pend Oreille County, Washington. It reports serving 110 people through 6 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 8 violations for this system; 4 are health-based, and the most recent began in June 2012.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
110
Service connections
6
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does Seattle City Light-Boundary Dam compare with other water systems in Pend Oreille County?
By EPA's size categories, Seattle City Light-Boundary Dam is a very small system (500 people or fewer). Pend Oreille County has 44 active public water systems. Its population served is about 58% below the county average of 259 people per system, and accounts for 1% of the 11,407 people reported by systems filed under the county. Across Washington, the 4,705 active systems average 2,172 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so Seattle City Light-Boundary Dam is well below that figure.
What does “non-transient non-community water system” mean?
A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. Washington has 400 active non-transient non-community water systems, 8.5% 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 Seattle City Light-Boundary Dam?
EPA lists Seattle City Light-Boundary Dam 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. 20 of the 44 active systems in Pend Oreille County (45%) are also owned by a local government.
Does Seattle City Light-Boundary Dam have drinking water violations?
EPA's records list 8 violations for this system; 4 are health-based, and the most recent began in June 2012. The violations listed here began between August 1992 and June 2012. By type: 4 monitoring and reporting and 4 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (7 of them). EPA lists 6 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 |
|---|---|---|---|---|
| 2012-06-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2003-07-01 | Monitoring and reportingInitial Tap Sampling for Pb and Cu · code 51 | Lead and Copper Rulecode 5000 | No | Resolved |
| 1998-11-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 1995-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 1995-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 1994-10-19 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1994-08-01 | 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 Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
All 8 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.
Seattle City Light-Boundary Dam: frequently asked questions
Who runs Seattle City Light-Boundary Dam?
Seattle City Light-Boundary Dam (PWSID WA5312521) is a non-transient non-community water system owned by a local government. It is regulated by the WA state drinking water program.
How many people does Seattle City Light-Boundary Dam serve?
Seattle City Light-Boundary Dam reports serving 110 people through 6 service connections in Pend Oreille County, Washington.
Where does Seattle City Light-Boundary Dam 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 Seattle City Light-Boundary Dam have any drinking water violations?
EPA's records list 8 violations for this system; 4 are health-based, and the most recent began in June 2012. 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 Seattle City Light-Boundary Dam'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 8 violations for this system; 4 are health-based, and the most recent began in June 2012. For current results, consult EPA ECHO, or the WA state drinking water program.
Where can I find Seattle City Light-Boundary Dam's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Seattle City Light-Boundary Dam is a non-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 Pend Oreille County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Newport City of | Pend Oreille | 3,331 | Community | Groundwater |
| Ione Water Dept | Pend Oreille | 2,395 | Community | Groundwater |
| Diamond Lake Water & Sewer District | Pend Oreille | 1,299 | Community | Groundwater |
| Cusick Town of | Pend Oreille | 672 | Community | Surface water |
| Metaline Falls Town of | Pend Oreille | 593 | Community | Surface water |
| Sullivan Lake Complex | Pend Oreille | 251 | 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, “Seattle City Light-Boundary Dam, PWSID WA5312521, Washington”, https://aquacensus.com/water-systems/washington/seattle-city-light-boundary-dam-wa5312521 (data as of October 1, 2026).