Public water system · 105300117
ActiveKwonesum
At a glance
Kwonesum (PWSID 105300117) is an active community water system in Washington. It reports serving 42 people through 18 service connections. Its primary water source is groundwater, and EPA lists it as Native American-owned. EPA's records list one violation for this system; it is not health-based, and the most recent began in April 2014.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
42
Service connections
18
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Kwonesum compare with other water systems in Washington?
By EPA's size categories, Kwonesum is a very small system (500 people or fewer). 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 Kwonesum 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 Kwonesum?
EPA lists Kwonesum as Native American-owned. The EPA Region 10 is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act.
Does Kwonesum have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in April 2014. By type: 1 monitoring and reporting. The contaminant or rule involved is Lead and Copper Rule. EPA lists 1 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 |
|---|---|---|---|---|
| 2014-04-03 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
The one violation in EPA's records.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.
Kwonesum: frequently asked questions
Who runs Kwonesum?
Kwonesum (PWSID 105300117) is a community water system Native American-owned. It is regulated by the EPA Region 10.
How many people does Kwonesum serve?
Kwonesum reports serving 42 people through 18 service connections in Washington.
Where does Kwonesum 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 Kwonesum have any drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in April 2014. 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 Kwonesum'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 one violation for this system; it is not health-based, and the most recent began in April 2014. For current results, consult the system's annual water quality report, EPA ECHO, or the EPA Region 10.
Where can I find Kwonesum's water quality report?
As a community water system, Kwonesum 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 Washington
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Seattle Public Utilities | King | 1,161,961 | Community | Surface water |
| Tacoma Water Division City of | Pierce | 446,170 | Community | Surface water |
| Vancouver City of | Clark | 373,047 | Community | Groundwater |
| Spokane City of | Spokane | 346,138 | Community | Groundwater |
| Bellevue City of | King | 321,349 | Community | Purchased surface water |
| Alderwood Water District | Snohomish | 245,715 | Community | Purchased 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, “Kwonesum, PWSID 105300117, Washington”, https://aquacensus.com/water-systems/washington/kwonesum-105300117 (data as of October 1, 2026).