Is Loma Rica, CA tap water safe?
The short answer
None of the 4 utilities serving Loma Rica has a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and California’s records.
Cal - Water Service Co. - Marysville, which serves the most people here, has 2 results above the health goal. The worst: Arsenic at 4.8 ppb, above the health goal. Health goals are stricter than legal limits and are not enforced.
The water from Cal - Water Service Co. - Marysville is hard to very hard depending on the source, 160 to 338 mg/L (9.4 to 19.7 grains per gallon). How California’s water compares.
A town can be served by more than one utility, and some homes are on private wells. The name on your water bill tells you which is yours, and your ZIP code narrows it down. They are listed by how many people each serves in Loma Rica’s ZIP codes, from EPA’s estimates.
- Open report
Cal - Water Service Co. - Marysville
California · serves 12,888 people · about 1,100 in Loma Rica
2 results above the health goal. The worst: Arsenic at 4.8 ppb, above the health goal. Hardness: hard to very hard depending on the source, 160 to 338 mg/L (9.4 to 19.7 grains per gallon).
No health-based violations since 2016
- Open report
Linda County Water District
California · serves 21,654 people · about 790 in Loma Rica
2 results above the health goal. The worst: Arsenic at 5.9 ppb, above the health goal. Hardness: moderately hard, 70 mg/L (4.1 grains per gallon).
No health-based violations since 2016
- Open report
Loma Rica Water Company
California · serves 200 people · under 100 in Loma Rica
1 result above the health goal. The worst: Arsenic at 8.6 ppb, above the health goal. Hardness: very hard, 272 mg/L (15.9 grains per gallon).
No health-based violations since 2016
- Open report
Castlewood Mobile Home Park
California · serves 200 people · under 100 in Loma Rica
1 result above the health goal. The worst: Lead at 0.5 ppb, above the health goal. Hardness: moderately hard, 100 mg/L (5.8 grains per gallon).
No health-based violations since 2016
What handles it
Each of these is certified, on a certifier’s listing, for a result above a line in Cal - Water Service Co. - Marysville’s water, which serves the most people here. Another utility’s report names what handles its own results.
Disclosure: TapBuff earns a commission if you buy through some links on this page. It does not change which standard or filter we name. As an Amazon Associate, TapBuff earns from qualifying purchases. How TapBuff makes money
Countertop reverse osmosis
- IAPMO listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 4, 2026
Certified for: Arsenic
Aquasana SmartFlow Reverse Osmosis (AQ-SFRO2)
Under-sink reverse osmosis
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 9, 2026
Certified for: Arsenic
Brondell Capella RC250 Reverse Osmosis System
Under-sink reverse osmosis
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 9, 2026
Certified for: Arsenic
Water testing near Loma Rica
The 3 labs California certifies closest to Loma Rica, 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 24 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics
Fruit Growers Laboratory, Inc.
Chico, CA · about 41 miles
Certified for bacteria
Eurofins Sacramento Service Center
West Sacramento, CA · about 44 miles
Certified for bacteria, nitrate, minerals and other inorganics
ZIP codes in Loma Rica
Which ZIP codes are in Loma Rica: Census 2020 relationship files. Which utilities serve them, and how many people: EPA SDWIS and EPA’s service area map. Each utility’s results: EPA UCMR 5, EPA SDWIS, and EPA’s and the state’s compliance monitoring, as its report lists them. How they are measured: methodology. Certified labs: California State Water Resources Control Board, ELAP accredited laboratories and their fields of accreditation; distances from the Census 2020 ZIP code tabulation area gazetteer.
Near Loma Rica
Other towns in Yuba County with a page of their own.
What to do next
- Read Cal - Water Service Co. - Marysville’s full reportEvery result with its dates, the violations, and the certification claim that handles each finding.Open the report
- Filters for ArsenicRanked by certification and what they cost over five years.The best reverse osmosis systems, ranked
- On a private well?No utility tests a well. A certified lab test is the first step.How to test well water