Public water system · WA5315296
ActiveFour Corners
At a glance
Four Corners (PWSID WA5315296) is an active community water system in Pierce County, Washington. It reports serving 77 people through 29 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list one violation for this system; it is not health-based, and the most recent began in October 1994.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
77
Service connections
29
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Four Corners compare with other water systems in Pierce County?
By EPA's size categories, Four Corners is a very small system (500 people or fewer). Pierce County has 358 active public water systems. Its population served is well below the county average of 3,335 people per system, and accounts for less than 0.1% of the 1,193,797 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 Four Corners 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 Four Corners?
EPA lists Four Corners 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. 257 of the 358 active systems in Pierce County (72%) are also privately owned.
Does Four Corners have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in October 1994. By type: 1 monitoring and reporting. The contaminant or rule involved is Total coliform bacteria (TCR). EPA lists 1 as archived. 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.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 1994-10-19 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
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.
Four Corners: frequently asked questions
Who runs Four Corners?
Four Corners (PWSID WA5315296) is a community water system privately owned. It is regulated by the WA state drinking water program.
How many people does Four Corners serve?
Four Corners reports serving 77 people through 29 service connections in Pierce County, Washington.
Where does Four Corners 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 Four Corners 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 October 1994. 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 Four Corners' 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 October 1994. For current results, consult the system's annual water quality report, EPA ECHO, or the WA state drinking water program.
Where can I find Four Corners' water quality report?
As a community water system, Four Corners 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 Pierce County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Tacoma Water Division City of | Pierce | 446,170 | Community | Surface water |
| Puyallup City of | Pierce | 94,520 | Community | Purchased surface water |
| Lakewood Water District | Pierce | 82,425 | Community | Groundwater |
| Southwood | Pierce | 64,155 | Community | Purchased surface water |
| Bonney Lake Water Department City | Pierce | 43,371 | Community | Purchased surface water |
| Firgrove Mutual Inc. | Pierce | 36,168 | 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, “Four Corners, PWSID WA5315296, Washington”, https://aquacensus.com/water-systems/washington/four-corners-wa5315296 (data as of October 1, 2026).