Public water system · CA5510011
ActiveCold Springs Water Co
At a glance
Cold Springs Water Co (PWSID CA5510011) is an active community water system in Tuolumne County, California. It reports serving 1,771 people through 538 service connections. Its primary water source is surface water, and EPA lists it as privately owned. EPA's records list 3 violations for this system; none is health-based, and the most recent began in April 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,771
Service connections
538
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Cold Springs Water Co compare with other water systems in Tuolumne County?
By EPA's size categories, Cold Springs Water Co is a small system (501 to 3,300 people). Tuolumne County has 117 active public water systems. Its population served is about 151% above the county average of 706 people per system, and accounts for 2.1% 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 Cold Springs Water Co 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. 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 Cold Springs Water Co?
EPA lists Cold Springs Water Co as privately owned. 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. 75 of the 117 active systems in Tuolumne County (64%) are also privately owned.
Does Cold Springs Water Co have drinking water violations?
EPA's records list 3 violations for this system; none is health-based, and the most recent began in April 2025. The violations listed here began between December 1979 and April 2025. By type: 1 monitoring, 1 monitoring and reporting and 1 public notice, recordkeeping or other. The contaminants or rules involved are Revised Total Coliform Rule and Lead and Copper Rule. EPA lists 2 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 |
| 1996-01-02 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 1979-12-28 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
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.
Cold Springs Water Co: frequently asked questions
Who runs Cold Springs Water Co?
Cold Springs Water Co (PWSID CA5510011) is a community water system privately owned. It is regulated by the CA state drinking water program.
How many people does Cold Springs Water Co serve?
Cold Springs Water Co reports serving 1,771 people through 538 service connections in Tuolumne County, California.
Where does Cold Springs Water Co 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 Cold Springs Water Co have any drinking water violations?
EPA's records list 3 violations for this system; none is 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 Cold Springs Water Co'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 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 Cold Springs Water Co's water quality report?
As a community water system, Cold Springs Water Co 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 - Sonora/Jamestown Water System | Tuolumne | 11,054 | 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 |
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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, “Cold Springs Water Co, PWSID CA5510011, California”, https://aquacensus.com/water-systems/california/cold-springs-water-co-ca5510011 (data as of October 1, 2026).