Pike Ranch Mutual Water Co
What EPA’s and California’s records show in this utility’s water: nitrate, arsenic and other regulated chemicals; lead and copper; and violations since 2016, with the certification that handles each result.
- Serves
- 74 people
- Connections
- 20
- Water source
- Groundwater
- Based in
- Oakhurst, CA
- County
- Madera
- Owner
- Private
The ZIP code it serves
The short answer
1 result is above EPA’s legal limit. The worst: Uranium, above the legal limit. 7 health-based violations since 2016.
What handles itWhat was found
Uranium, nitrate, total trihalomethanes (TTHM), fluoride, arsenic, chromium (total) and haloacetic acids (HAA5): California’s own results, samples taken from April 6, 2020 to May 6, 2026, with EPA’s 2012 to 2019 file for earlier years.
Above the legal limit1
Uranium
Comes from the source
144ppb
Highest yearly average, 2020 to 2026
2026 average: 2.4 ppb
Averaged by year, the highest was 144 ppb, in 2021, about 4.8 times EPA’s legal limit of 30 ppb. Its highest single sample was 283 ppb. In 2026, the latest year on file, its nine samples averaged 2.4 ppb. EPA recorded violations for uranium at this utility in 2020, 2021, 2022 and 2023. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 189 ppb, in 2014, and EPA recorded a violation in 2018.
What handles it
- NSF/ANSI 58 look for “Uranium”
Below EPA’s limits3
Nitrate
Comes from the source
0.8ppm
Highest sample; found in 4 of 5
2025, one sample: 0.72 ppm
The highest sample, in 2023, was 0.8 ppm, below EPA’s legal limit of 10 ppm. In 2025, the latest year on file, its one sample was 0.72 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 1.1 ppm, in 2019.
What handles it
- NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
- NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”
Total trihalomethanes (TTHM)
Forms or is added in treatment
3.3ppb
Highest yearly average, 2020 to 2023
2023: not found
Averaged by year, the highest was 3.3 ppb, in 2020, below EPA’s legal limit of 80 ppb. In 2023, the latest year on file, it wasn’t found in its one sample. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 7.5 ppb, in 2019.
What handles it
- NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
- NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”
Fluoride
Forms or is added in treatment
0.1ppm
Highest yearly average, 2020 to 2023
2023: not found
Averaged by year, the highest was 0.1 ppm, in 2020, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 0.11 ppm. In 2023, the latest year on file, it wasn’t found in its one sample. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.11 ppm, in 2015.
What handles it
- NSF/ANSI 58 look for “Fluoride Reduction”
- NSF/ANSI 53 look for “Fluoride”
4 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
- Arsenic
- Chromium (total)
- Haloacetic acids (HAA5)
- Lead
What handles it
A certification covers specific claims, not a whole standard. Look for these claims on the certifier’s listing, not the box. Wording varies a little: NSF writes “Lead Reduction,” WQA just “Lead.”
- NSF/ANSI 58
Claim: Uranium
For: Uranium
At the tap, or for the whole house?
These come with the water itself, so a whole-house system certified for the same claims treats every tap and shower. A filter at the tap treats drinking water for much less. How whole-house systems compare.
Filters with those claims on a certifier’s listing
None of the filters TapBuff has checked so far carry these claims. Search the certifier listings for the claim above.
Compare five-year costsViolations since 2016
| Contaminant or rule | Type | Period | Measured | Status |
|---|---|---|---|---|
| Lead and Copper Rule Revisions | The required inventory of lead service lines was not completed or submitted on time.EPA: LSL Inventory | Oct. 17, 2024 | — | Unaddressed |
| Combined Uranium | The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, Average | Jan. 1, 2023 to March 31, 2023 | 34 PCI/L | Archived |
| Combined Uranium | The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, Average | Jan. 1, 2022 to Dec. 31, 2022 | 40 PCI/L | Archived |
| Combined Uranium | The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, Average | Jan. 1, 2021 to Dec. 31, 2021 | 97 PCI/L | Archived |
| Revised Total Coliform Rule | E. coli was confirmed in the water system.EPA: Maximum Contaminant Level Violation, E. coli (RTCR) | Aug. 1, 2020 to Aug. 31, 2020 | — | Resolved |
| Combined Uranium | The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, Average | Jan. 1, 2020 to Dec. 31, 2020 | 54.5 PCI/L | Archived |
| Combined Uranium | A sample was above the legal limit, for a contaminant judged one sample at a time.EPA: Maximum Contaminant Level Violation, Single Sample | July 1, 2018 to Sept. 30, 2018 | 80 PCI/L | Archived |
| Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 46 monitoring or reporting violations not shown. | ||||
What this report can’t tell you
Everything else. Uranium, nitrate, total trihalomethanes (TTHM), fluoride, arsenic, chromium (total) and haloacetic acids (HAA5) results here are California’s own from 2020 on, with EPA’s national file for 2012 to 2019. Pike Ranch Mutual Water Co’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 April 6, 2020 to May 6, 2026.
Testing your own tap
The 3 labs California certifies closest to the area Pike Ranch Mutual Water Co serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
SGS North America, Inc.
Clovis, CA · about 37 miles
Certified for nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts, PFAS
BSK Associates
Fresno, CA · about 44 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts, PFAS, radioactivity
Dellavalle Laboratory, Inc.
Fresno, CA · about 44 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, radioactivity
Sources
- 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
- EPA Six-Year Review 4 compliance monitoring data, 2012 to 2019, file of Feb. 5, 2024
- Certified labs: California State Water Resources Control Board, ELAP accredited laboratories and their fields of accreditation, read Oct. 17, 2026; distances from the Census 2020 ZIP code tabulation area gazetteer
- Limits and goals: each contaminant’s page, with its EPA source.
- How this page is built: methodology.
PWSID CA2000526. Rebuilt from EPA data on Oct. 18, 2026.
What to do next
- Read up on UraniumWhat each one does to health, where it comes from, and the certification claim that addresses it.About Uranium
- Get the utility’s own reportPike Ranch Mutual Water Co 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
- Compare certified filtersWhat the filters certified for these results cost over five years, cartridges included.Compare five-year costs