Public water system · CA4910010
ActiveSonoma County Csa 41-Fitch Mountain
At a glance
Sonoma County Csa 41-Fitch Mountain (PWSID CA4910010) is an active community water system in Sonoma County, California. It reports serving 1,265 people through 339 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's records list 3 violations for this system; none is health-based, and the most recent began in June 2022.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,265
Service connections
339
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Sonoma County Csa 41-Fitch Mountain compare with other water systems in Sonoma County?
By EPA's size categories, Sonoma County Csa 41-Fitch Mountain is a small system (501 to 3,300 people). Sonoma County has 441 active public water systems. Its population served is about 16% above the county average of 1,092 people per system, and accounts for 0.3% of the 481,435 people reported by systems filed under the county. 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 Sonoma County Csa 41-Fitch Mountain 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 Sonoma County Csa 41-Fitch Mountain?
EPA lists Sonoma County Csa 41-Fitch Mountain as owned by a local government. The CA state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 58 of the 441 active systems in Sonoma County (13%) are also owned by a local government.
Does Sonoma County Csa 41-Fitch Mountain have drinking water violations?
EPA's records list 3 violations for this system; none is health-based, and the most recent began in June 2022. The violations listed here began between July 1993 and June 2022. By type: 3 monitoring and reporting. The contaminant or rule involved most often is Lead and Copper 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 |
|---|---|---|---|---|
| 2022-06-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 1999-04-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1993-07-01 | Monitoring and reportingInitial Tap Sampling for Pb and Cu · code 51 | Lead and Copper Rulecode 5000 | 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.
Sonoma County Csa 41-Fitch Mountain: frequently asked questions
Who runs Sonoma County Csa 41-Fitch Mountain?
Sonoma County Csa 41-Fitch Mountain (PWSID CA4910010) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does Sonoma County Csa 41-Fitch Mountain serve?
Sonoma County Csa 41-Fitch Mountain reports serving 1,265 people through 339 service connections in Sonoma County, California.
Where does Sonoma County Csa 41-Fitch Mountain 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 Sonoma County Csa 41-Fitch Mountain have any drinking water violations?
EPA's records list 3 violations for this system; none is health-based, and the most recent began in June 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 Sonoma County Csa 41-Fitch Mountain'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 June 2022. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Sonoma County Csa 41-Fitch Mountain's water quality report?
As a community water system, Sonoma County Csa 41-Fitch Mountain 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 Sonoma County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Santa Rosa, City of | Sonoma | 175,396 | Community | Groundwater |
| Petaluma, City of | Sonoma | 60,781 | Community | Groundwater |
| Rohnert Park, City of | Sonoma | 43,821 | Community | Groundwater |
| Windsor, Town of | Sonoma | 25,561 | Community | Groundwater |
| Valley of the Moon Water District | Sonoma | 23,107 | Community | Groundwater |
| Sonoma, City of | Sonoma | 11,725 | 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, “Sonoma County Csa 41-Fitch Mountain, PWSID CA4910010, California”, https://aquacensus.com/water-systems/california/sonoma-county-csa-41-fitch-mountain-ca4910010 (data as of October 1, 2026).