Public water system · CA5510001
ActiveTud - Sonora/Jamestown Water System
At a glance
Tud - Sonora/Jamestown Water System (PWSID CA5510001) is an active community water system in Tuolumne County, California. It reports serving 11,054 people through 5,121 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. EPA's records list 6 violations for this system; 2 are health-based, and the most recent began in April 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
11,054
Service connections
5,121
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Tud - Sonora/Jamestown Water System compare with other water systems in Tuolumne County?
By EPA's size categories, Tud - Sonora/Jamestown Water System is a large system (10,001 to 100,000 people). Tuolumne County has 117 active public water systems, and Tud - Sonora/Jamestown Water System is the 2nd-largest of them by population served. Its population served is about 16 times the county average of 706 people per system, and accounts for 13% of the 82,611 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 Tud - Sonora/Jamestown Water System is about 65% above 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. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 609 California systems (8.1%) list surface water as their primary source.
Who owns and regulates Tud - Sonora/Jamestown Water System?
EPA lists Tud - Sonora/Jamestown Water System 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. 17 of the 117 active systems in Tuolumne County (15%) are also owned by a local government.
Does Tud - Sonora/Jamestown Water System have drinking water violations?
EPA's records list 6 violations for this system; 2 are health-based, and the most recent began in April 2025. The violations listed here began between July 1980 and April 2025. By type: 2 monitoring and reporting, 2 required treatment not met, 1 monitoring and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Total coliform bacteria (TCR) (2 of them). EPA lists 5 as resolved and 1 as archived. 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. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-04-01 | MonitoringMonitoring, Lab Certification/Method Error (RTCR) · code 3D | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2005-07-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2005-06-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1995-03-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Resolved |
| 1995-02-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Resolved |
| 1980-07-28 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
All 6 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.
Tud - Sonora/Jamestown Water System: frequently asked questions
Who runs Tud - Sonora/Jamestown Water System?
Tud - Sonora/Jamestown Water System (PWSID CA5510001) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does Tud - Sonora/Jamestown Water System serve?
Tud - Sonora/Jamestown Water System reports serving 11,054 people through 5,121 service connections in Tuolumne County, California.
Where does Tud - Sonora/Jamestown Water System get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does Tud - Sonora/Jamestown Water System have any drinking water violations?
EPA's records list 6 violations for this system; 2 are health-based, and the most recent began in April 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 Tud - Sonora/Jamestown Water System'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 6 violations for this system; 2 are health-based, and the most recent began in April 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Tud - Sonora/Jamestown Water System's water quality report?
As a community water system, Tud - Sonora/Jamestown Water System 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 Tuolumne County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Tud - Upper Basin Water System | Tuolumne | 13,280 | Community | Surface water |
| Tud - Columbia Water System | Tuolumne | 5,463 | Community | Surface water |
| Peppery Bar and Grill, the | Tuolumne | 4,500 | Transient non-community | Groundwater |
| Cdcr - Sierra Conservation Center | Tuolumne | 3,571 | Community | Surface water |
| Groveland Community Serv Dist | Tuolumne | 3,400 | Community | Surface water |
| Lake Don Pedro Csd | Tuolumne | 3,240 | Community | 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, “Tud - Sonora/Jamestown Water System, PWSID CA5510001, California”, https://aquacensus.com/water-systems/california/tud-sonora-jamestown-water-system-ca5510001 (data as of October 1, 2026).