Washington Ridge C.C.

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: 70 people
Connections: 4
Water source: Groundwater
Based in: Nevada City, CA
County: Nevada
Owner: State government
Hardness: Soft

The ZIP code it serves

95959

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, plus lead and copper, not everything. No health-based violations on file since 2016.

What was found

Copper: EPA’s file records a utility’s copper only when it exceeds the action level. The last here was 1.6 ppm, for the period ending Dec. 31, 2004. None since is on file, so it is not counted as a current finding.

Arsenic, chromium (total), fluoride, nitrate, total trihalomethanes (TTHM) and uranium: California’s own results, samples taken from March 11, 2020 to June 3, 2026, with EPA’s 2012 to 2019 file for earlier years.

None of the contaminants in the records below were found at or above the reporting levels.

7 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.

Arsenic
Chromium (total)
Fluoride
Lead
Nitrate
Total trihalomethanes (TTHM)
Uranium

Hardness

Soft, typically 36 mg/L (2.1 grains per gallon), across 3 sampling points, 2019 to 2025.

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.

Softeners compared at 2.1 grains per gallon, salt included Softener or salt-free conditioner?California water hardness, utility by utility

Violations since 2016

No health-based violations on file with EPA since 2016. There is 1 monitoring or reporting violation: a sample missed, late or not reported.

What this report can’t tell you

Everything else. Arsenic, chromium (total), fluoride, nitrate, total trihalomethanes (TTHM) and uranium results here are California’s own from 2020 on, with EPA’s national file for 2012 to 2019. Washington Ridge C.C.’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 March 11, 2020 to June 3, 2026.

Testing your own tap

Washington Ridge C.C.’s results are for the water it sends out. What your own service line, solder and fixtures add shows up only in a test of your tap, by a lab California certifies.

The 3 labs California certifies closest to the area Washington Ridge C.C. serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

Cranmer Engineering, Inc.
Grass Valley, CA · about 11 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics
(530) 273-7284
Onterris Laboratories, LLC
El Dorado Hills, CA · about 50 miles
Certified for organic chemicals, PFAS
(916) 673-1520
Ceres Analytical Laboratory, Inc.
El Dorado Hills, CA · about 50 miles
Certified for organic chemicals
(916) 932-5011