Cold Creek Mutual Water Company
What EPA’s and California’s records show in this utility’s water: nitrate, arsenic and other regulated chemicals, plus violations since 2016, with the certification that handles each result.
- Serves
- 63 people
- Connections
- 19
- Water source
- Groundwater
- Based in
- MT. Shasta, CA
- County
- Siskiyou
- Owner
- Private
- Hardness
- Soft
The short answer
Nothing in EPA’s and California’s records for this utility is above a health goal. That covers nitrate, arsenic and other regulated chemicals, not everything. No health-based violations on file since 2016.
What was found
Nitrate, arsenic, chromium (total) and fluoride: California’s own results, samples taken from Sept. 13, 2023 to June 25, 2024.
Below EPA’s limits1
Nitrate
Comes from the source
0.12ppm
One sample
2023, one sample: 0.12 ppm
The highest sample, in 2023, was 0.12 ppm, below EPA’s legal limit of 10 ppm. That is the only year on file, and its one sample was 0.12 ppm.
What handles it
- NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
- NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”
3 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
- Arsenic
- Chromium (total)
- Fluoride
Hardness
Soft, 27 mg/L (1.6 grains per gallon), at its one sampling point, in 2023.
Hardness is calcium and magnesium. EPA sets no limit for it: it shows up as scale on fixtures and in water heaters, and as soap that won’t lather. USGS calls water above 60 mg/L moderately hard, above 120 hard and above 180 very hard.
Violations since 2016
No health-based violations on file with EPA since 2016.
What this report can’t tell you
Everything else. Nitrate, arsenic, chromium (total) and fluoride results here are California’s own from 2023 on, with EPA’s national file for 2012 to 2019. Cold Creek Mutual Water Company’s own annual report, which it must send you every year, has the contaminants this page does not show.
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.
What it means for your health. This page reports what the records show and EPA’s limits and goals; it is not medical advice. If you are worried about a health effect, talk to a doctor or your local health department.
Anything after the latest data. SDWIS data is from 2026 Q3; UCMR 5 didn’t sample this utility; California’s results run from Sept. 13, 2023 to June 25, 2024.
Testing your own tap
No lab California certifies is within 75 miles of the area Cold Creek Mutual Water Company serves on the state’s list. Some take samples by mail; the state’s page lists them all.
All 145 certified labs for CaliforniaSources
- EPA UCMR 5 occurrence data, file of Oct. 15, 2026
- EPA SDWA bulk download (SDWIS federal data), 2026 Q3
- California State Water Resources Control Board, Division of Drinking Water, results from Jan. 1, 2020 to July 17, 2026, read Oct. 8, 2026
- Hardness: California State Water Resources Control Board, Division of Drinking Water, results from Sept. 13, 2023 to Sept. 13, 2023, read Oct. 10, 2026
- Limits and goals: each contaminant’s page, with its EPA source.
- How this page is built: methodology.
PWSID CA4700885. Rebuilt from EPA data on Oct. 18, 2026.
What to do next
- Nothing here is above a health goalIn EPA’s and California’s records for this utility. They don’t cover everything, which is why the next step matters.Every contaminant TapBuff tracks
- Get the utility’s own reportCold Creek Mutual Water Company must send you a water quality report every year. It covers contaminants this page does not show.How to read it
- Test your own tap for leadYour service line, solder and fixtures decide the lead at your faucet, not the utility’s average.Lead in your water: what to do
- Decide if you want a filter at allA filter for taste or chlorine is a preference, not a need. The standards say what each kind can do.NSF/ANSI standards, decoded