Humboldt Woodlands Mutual

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: 64 people
Connections: 26
Water source: Groundwater
Based in: Forest Ranch, CA
County: Butte
Owner: Private
Hardness: Moderately hard

The ZIP code it serves

95942

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. 1 health-based violation since 2016.

What was found

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

6 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)

Hardness

Moderately hard, 89 mg/L (5.2 grains per gallon), at its one sampling point, in 2026.

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 5.2 grains per gallon, salt included Softener or salt-free conditioner?California water hardness, utility by utility

Violations 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
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 1 monitoring or reporting violation not shown.

What this report can’t tell you

Everything else. Arsenic, chromium (total), fluoride, nitrate and total trihalomethanes (TTHM) results here are California’s own from 2020 on, with EPA’s national file for 2012 to 2019. Humboldt Woodlands Mutual’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 29, 2020 to March 2, 2026.

Testing your own tap

Humboldt Woodlands Mutual’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 Humboldt Woodlands Mutual serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

Fruit Growers Laboratory, Inc.
Chico, CA · about 24 miles
Certified for bacteria
(530) 343-5818
Pace Analytical Services, LLC - Redding
Redding, CA · about 58 miles
Certified for bacteria
(530) 999-4051
Cranmer Engineering, Inc.
Grass Valley, CA · about 61 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics
(530) 273-7284