Public water system · WA53AD011
ActiveSundquist Sunnyslope Domestic
At a glance
Sundquist Sunnyslope Domestic (PWSID WA53AD011) is an active community water system in Yakima County, Washington. It reports serving 196 people through 1 service connection. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 3 violations for this system; none is health-based, and the most recent began in September 2019.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
196
Service connections
1
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Sundquist Sunnyslope Domestic compare with other water systems in Yakima County?
By EPA's size categories, Sundquist Sunnyslope Domestic is a very small system (500 people or fewer). Yakima County has 217 active public water systems. Its population served is well below the county average of 1,230 people per system, and accounts for less than 0.1% 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 Sundquist Sunnyslope Domestic 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 Sundquist Sunnyslope Domestic?
EPA lists Sundquist Sunnyslope Domestic 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. 182 of the 217 active systems in Yakima County (84%) are also privately owned.
Does Sundquist Sunnyslope Domestic have drinking water violations?
EPA's records list 3 violations for this system; none is health-based, and the most recent began in September 2019. The violations listed here began between November 2015 and September 2019. By type: 2 monitoring and 1 monitoring and reporting. The contaminant or rule involved most often is Revised Total Coliform Rule (2 of them). EPA lists 3 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 |
|---|---|---|---|---|
| 2019-09-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2019-08-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2015-11-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
All 3 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.
Sundquist Sunnyslope Domestic: frequently asked questions
Who runs Sundquist Sunnyslope Domestic?
Sundquist Sunnyslope Domestic (PWSID WA53AD011) is a community water system privately owned. It is regulated by the WA state drinking water program.
How many people does Sundquist Sunnyslope Domestic serve?
Sundquist Sunnyslope Domestic reports serving 196 people through 1 service connection in Yakima County, Washington.
Where does Sundquist Sunnyslope Domestic 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 Sundquist Sunnyslope Domestic have any drinking water violations?
EPA's records list 3 violations for this system; none is health-based, and the most recent began in September 2019. 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 Sundquist Sunnyslope Domestic'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 3 violations for this system; none is health-based, and the most recent began in September 2019. For current results, consult the system's annual water quality report, EPA ECHO, or the WA state drinking water program.
Where can I find Sundquist Sunnyslope Domestic's water quality report?
As a community water system, Sundquist Sunnyslope Domestic 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 |
| Toppenish Water Department | Yakima | 8,950 | 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, “Sundquist Sunnyslope Domestic, PWSID WA53AD011, Washington”, https://aquacensus.com/water-systems/washington/sundquist-sunnyslope-domestic-wa53ad011 (data as of October 1, 2026).