Public water system · WA5318500
ActiveDeer Park City of
At a glance
City of Deer Park (PWSID WA5318500) is an active community water system in Spokane County, Washington. It reports serving 5,435 people through 2,616 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
5,435
Service connections
2,616
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does City of Deer Park compare with other water systems in Spokane County?
By EPA's size categories, City of Deer Park is a medium system (3,301 to 10,000 people). Spokane County has 163 active public water systems. Its population served is about 40% above the county average of 3,871 people per system, and accounts for 0.9% of the 631,008 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 City of Deer Park is about 19% 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 City of Deer Park?
EPA lists City of Deer Park 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. 55 of the 163 active systems in Spokane County (34%) are also owned by a local government.
Does City of Deer Park have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2025. The violations listed here began between October 2025 and October 2025. By type: 12 monitoring and reporting. The contaminants or rules involved are Endrin, Hexachlorocyclopentadiene, Benzene and Carbon tetrachloride. EPA lists 12 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 |
|---|---|---|---|---|
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Endrincode 2005 | No | Resolved |
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Hexachlorocyclopentadienecode 2042 | No | Resolved |
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Benzenecode 2990 | No | Resolved |
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Carbon tetrachloridecode 2982 | No | Resolved |
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Chlordanecode 2959 | No | Resolved |
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Dinosebcode 2041 | No | Resolved |
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Dichloromethanecode 2964 | No | Resolved |
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Simazinecode 2037 | No | Resolved |
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Di(2-ethylhexyl) adipatecode 2035 | No | Resolved |
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Picloramcode 2040 | No | Resolved |
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Lindane (gamma-BHC)code 2010 | No | Resolved |
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Ethylbenzenecode 2992 | No | Resolved |
The 12 most recent 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.
City of Deer Park: frequently asked questions
Who runs City of Deer Park?
City of Deer Park (PWSID WA5318500) is a community water system owned by a local government. It is regulated by the WA state drinking water program.
How many people does City of Deer Park serve?
City of Deer Park reports serving 5,435 people through 2,616 service connections in Spokane County, Washington.
Where does City of Deer Park 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 City of Deer Park have any drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 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 City of Deer Park'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. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 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 City of Deer Park's water quality report?
As a community water system, City of Deer Park 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 Spokane County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Spokane City of | Spokane | 346,138 | Community | Groundwater |
| Whitworth Water District 2 | Spokane | 26,883 | Community | Groundwater |
| Vera Water & Power | Spokane | 24,692 | Community | Groundwater |
| Consolidated Irrig Dist 19 System 2 | Spokane | 21,220 | Community | Groundwater |
| Spo Co Water Dist 3 Sys 1 | Spokane | 19,035 | Community | Groundwater |
| Modern Electric Water Co | Spokane | 18,487 | 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, “Deer Park City of, PWSID WA5318500, Washington”, https://aquacensus.com/water-systems/washington/deer-park-city-of-wa5318500 (data as of October 1, 2026).