Public water system · WA5327091
ActiveCloister
At a glance
Cloister (PWSID WA5327091) is an active community water system in Thurston County, Washington. It reports serving 29 people through 11 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's Safe Drinking Water Act records list no violations for this system.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
29
Service connections
11
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Cloister compare with other water systems in Thurston County?
By EPA's size categories, Cloister is a very small system (500 people or fewer). Thurston County has 322 active public water systems. Its population served is well below the county average of 1,233 people per system, and accounts for less than 0.1% of the 397,060 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 Cloister 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 Cloister?
EPA lists Cloister 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. 237 of the 322 active systems in Thurston County (74%) are also privately owned.
Does Cloister have drinking water violations?
No SDWA violations on record.
EPA's SDWA violation and enforcement data (via EPA ECHO, updated quarterly) lists no violations for Cloister. For the latest compliance status, check EPA ECHO for current compliance history.
Cloister: frequently asked questions
Who runs Cloister?
Cloister (PWSID WA5327091) is a community water system privately owned. It is regulated by the WA state drinking water program.
How many people does Cloister serve?
Cloister reports serving 29 people through 11 service connections in Thurston County, Washington.
Where does Cloister 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 Cloister have any drinking water violations?
EPA's Safe Drinking Water Act records list no violations for this system.
Is Cloister'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 Safe Drinking Water Act records list no violations for this system. For current results, consult the system's annual water quality report, EPA ECHO, or the WA state drinking water program.
Where can I find Cloister's water quality report?
As a community water system, Cloister 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 Thurston County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Olympia City of | Thurston | 126,966 | Community | Groundwater |
| Lacey Water Department | Thurston | 105,178 | Community | Groundwater |
| Tumwater City of | Thurston | 51,802 | Community | Groundwater |
| Yelm City of | Thurston | 17,355 | Community | Groundwater |
| Tanglewilde Thompson Place 600 | Thurston | 7,900 | Community | Groundwater |
| Pattison 500 | Thurston | 4,643 | 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, “Cloister, PWSID WA5327091, Washington”, https://aquacensus.com/water-systems/washington/cloister-wa5327091 (data as of October 1, 2026).