Public water system · 090605169
ActiveTuolumne Me-Wuk Ridgeline
At a glance
Tuolumne Me-Wuk Ridgeline (PWSID 090605169) is an active community water system in California. It reports serving 30 people through 13 service connections. Its primary water source is purchased surface water, and EPA lists it as Native American-owned. EPA's records list 4 violations for this system; none is health-based, and the most recent began in December 2022.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
30
Service connections
13
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Tuolumne Me-Wuk Ridgeline compare with other water systems in California?
By EPA's size categories, Tuolumne Me-Wuk Ridgeline is a very small system (500 people or fewer). Across California, the 7,479 active systems average 5,706 people each. Nationally, the average active community water system reports serving 6,703 people, so Tuolumne Me-Wuk Ridgeline 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. California has 2,997 active community water systems, 40% of the state's 7,479 active systems. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 506 California systems (6.8%) list purchased surface water as their primary source.
Who owns and regulates Tuolumne Me-Wuk Ridgeline?
EPA lists Tuolumne Me-Wuk Ridgeline as Native American-owned. The EPA Region 09 is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act.
Does Tuolumne Me-Wuk Ridgeline have drinking water violations?
EPA's records list 4 violations for this system; none is health-based, and the most recent began in December 2022. The violations listed here began between April 2020 and December 2022. By type: 3 reporting and 1 monitoring. The contaminant or rule involved most often is Revised Total Coliform Rule (4 of them). EPA lists 4 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 |
|---|---|---|---|---|
| 2022-12-01 | ReportingReport Sample Result/Fail Monitor (RTCR) · code 4B | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2022-08-01 | ReportingReport Sample Result/Fail Monitor (RTCR) · code 4B | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2021-10-01 | ReportingReport Sample Result/Fail Monitor (RTCR) · code 4B | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2020-04-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
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.
Tuolumne Me-Wuk Ridgeline: frequently asked questions
Who runs Tuolumne Me-Wuk Ridgeline?
Tuolumne Me-Wuk Ridgeline (PWSID 090605169) is a community water system Native American-owned. It is regulated by the EPA Region 09.
How many people does Tuolumne Me-Wuk Ridgeline serve?
Tuolumne Me-Wuk Ridgeline reports serving 30 people through 13 service connections in California.
Where does Tuolumne Me-Wuk Ridgeline get its water?
EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.
Does Tuolumne Me-Wuk Ridgeline have any drinking water violations?
EPA's records list 4 violations for this system; none is health-based, and the most recent began in December 2022. 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 Tuolumne Me-Wuk Ridgeline'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 December 2022. For current results, consult the system's annual water quality report, EPA ECHO, or the EPA Region 09.
Where can I find Tuolumne Me-Wuk Ridgeline's water quality report?
As a community water system, Tuolumne Me-Wuk Ridgeline 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 California
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Los Angeles-City, Dept. of Water & Power | Los Angeles | 3,875,566 | Community | Surface water |
| East Bay MUD | Alameda | 1,442,800 | Community | Surface water |
| San Diego, City of | San Diego | 1,385,379 | Community | Surface water |
| San Jose Water | Santa Clara | 1,039,920 | Community | Surface water |
| Sfpuc City Distribution Division | San Francisco | 848,019 | Community | Purchased surface water |
| Eastern Municipal Wd | Riverside | 666,581 | 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, “Tuolumne Me-Wuk Ridgeline, PWSID 090605169, California”, https://aquacensus.com/water-systems/california/tuolumne-me-wuk-ridgeline-090605169 (data as of October 1, 2026).