Public water system · WA5388850
ActiveToppenish Water Department
At a glance
Toppenish Water Department (PWSID WA5388850) is an active community water system in Yakima County, Washington. It reports serving 8,950 people through 2,636 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 4 violations for this system; none is health-based, and the most recent began in July 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
8,950
Service connections
2,636
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Toppenish Water Department compare with other water systems in Yakima County?
By EPA's size categories, Toppenish Water Department is a medium system (3,301 to 10,000 people). Yakima County has 217 active public water systems, and Toppenish Water Department is the 6th-largest of them by population served. Its population served is about 7.3 times the county average of 1,230 people per system, and accounts for 3.4% of the 266,832 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 Toppenish Water Department is about 34% above 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 Toppenish Water Department?
EPA lists Toppenish Water Department 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. 21 of the 217 active systems in Yakima County (9.7%) are also owned by a local government.
Does Toppenish Water Department have drinking water violations?
EPA's records list 4 violations for this system; none is health-based, and the most recent began in July 2025. The violations listed here began between October 1979 and July 2025. By type: 4 monitoring and reporting. The contaminants or rules involved are Haloacetic acids (HAA5), Total trihalomethanes (TTHM), Nitrate and Gross alpha (excluding radon and uranium). EPA lists 3 as resolved and 1 as archived. 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. 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 |
|---|---|---|---|---|
| 2025-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2025-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2014-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1979-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Archived |
All 4 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.
Toppenish Water Department: frequently asked questions
Who runs Toppenish Water Department?
Toppenish Water Department (PWSID WA5388850) is a community water system owned by a local government. It is regulated by the WA state drinking water program.
How many people does Toppenish Water Department serve?
Toppenish Water Department reports serving 8,950 people through 2,636 service connections in Yakima County, Washington.
Where does Toppenish Water Department 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 Toppenish Water Department have any drinking water violations?
EPA's records list 4 violations for this system; none is health-based, and the most recent began in July 2025. 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 Toppenish Water Department'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 4 violations for this system; none is health-based, and the most recent began in July 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the WA state drinking water program.
Where can I find Toppenish Water Department's water quality report?
As a community water system, Toppenish Water Department 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 Yakima County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Yakima Water Division City of | Yakima | 112,858 | Community | Surface water |
| Nob Hill Water Association | Yakima | 38,050 | Community | Groundwater |
| Sunnyside City of | Yakima | 17,194 | Community | Groundwater |
| Grandview City of | Yakima | 11,010 | Community | Groundwater |
| Selah City of | Yakima | 9,331 | Community | Groundwater |
| Yak Co - Terrace Heights | Yakima | 8,410 | 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, “Toppenish Water Department, PWSID WA5388850, Washington”, https://aquacensus.com/water-systems/washington/toppenish-water-department-wa5388850 (data as of October 1, 2026).