Cdcr - Sierra Conservation Centerwater quality report, rewritten
- Serves
- 3,571
- Connections
- 578
- Water source
- Surface water
- Based in
- Jamestown, CA
- County
- Tuolumne
- Owner
- State government
PWSID CA55108512026 edition · EPA data
Read this first
Nothing in the federal data for this utility is above a health goal. That covers PFAS, lithium, lead and copper; it does not cover everything, so read what this report cannot tell you below.
4 health-based violations since 2016. Details are below.
What was found
Highlighted: above the health goal. Circled: above the legal limit in at least one sample. Every scale puts the legal line at its middle.
None of the contaminants in the federal data below were found at or above EPA’s reporting levels.
Tested and not found
Below EPA’s minimum reporting level in every sample. Not found means not measured above that level, which is not the same as zero.
- Lead
Violations since 2016
| Contaminant or rule | Type | Period | Measured | Status |
|---|---|---|---|---|
| Total Haloacetic Acids (HAA5) | Maximum Contaminant Level Violation, Average | Jan. 1, 2019 to March 31, 2019 | 0.067 MG/L | Resolved |
| Total Haloacetic Acids (HAA5) | Maximum Contaminant Level Violation, Average | Oct. 1, 2018 to Dec. 31, 2018 | 0.062 UG/L | Resolved |
| Total Haloacetic Acids (HAA5) | Maximum Contaminant Level Violation, Average | July 1, 2018 to Sept. 30, 2018 | 0.066 MG/L | Resolved |
| Total Haloacetic Acids (HAA5) | Maximum Contaminant Level Violation, Average | April 1, 2018 to June 30, 2018 | 0.062 MG/L | Resolved |
| Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. | ||||
What this report cannot tell you
- Levels of everything else. Federal bulk data carries results for PFAS, lithium, lead and copper, and violations for the rest. Nitrate, arsenic, disinfection byproducts and other levels are in Cdcr - Sierra Conservation Center’s own annual report, which it must send you every year.
- Your own plumbing. Lead results are the 90th percentile across homes the utility samples. Your home’s service line, solder and fixtures decide yours. A certified lab test is the only way to know.
- Anything after the latest data. SDWIS data is from 2026 Q2; UCMR 5 samples are from no sampling at this utility.
Other California utilities
- Los Angeles - City, Dept. of Water & Power3.9 million
- East Bay MUD1.4 million
- City of San Diego1.4 million
- San Jose Water1 million
- SFPUC City Distribution Division848,019
- Eastern Municipal WD666,581
- City of Fresno545,716
- City of Sacramento Main527,979
- Long Beach Utilities Department466,772
- Irvine Ranch Water District444,800
- City of Anaheim348,593
- Alameda County Water District344,000
Sources
- EPA UCMR 5 occurrence data, file of Aug. 27, 2026
- EPA SDWA bulk download (SDWIS federal data), 2026 Q2
- Limits and goals: each contaminant’s page, with its EPA source.
- How this page is built: methodology.