Is Loyola, CA tap water safe?
The short answer
Neither of the 2 utilities serving Loyola has a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and California’s records.
Cwsc Los Altos Suburban, which serves the most people here, has 2 results above the health goal. The worst: Lead at 1.5 ppb, above the health goal. Health goals are stricter than legal limits and are not enforced.
The water from Cwsc Los Altos Suburban is hard to very hard depending on the source, 146 to 445 mg/L (8.5 to 26 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 Loyola’s ZIP codes, from EPA’s estimates.
- Open report
Cwsc Los Altos Suburban
California · serves 63,559 people · about 1,900 in Loyola
2 results above the health goal. The worst: Lead at 1.5 ppb, above the health goal. Hardness: hard to very hard depending on the source, 146 to 445 mg/L (8.5 to 26 grains per gallon).
No health-based violations since 2016
- Open report
City of Cupertino
California · serves 16,336 people · under 100 in Loyola
1 result above the health goal. The worst: Arsenic at 1.1 ppb, above the health goal. Hardness: very hard, typically 337 mg/L (19.7 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 Cwsc Los Altos Suburban’s water, which serves the most people here. Another utility’s report names what handles its own results.
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Brita Tahoe Pitcher with Elite Filter (OB60, OB06)
Pitcher
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 401checked Oct. 13, 2026
- IAPMO listing:NSF/ANSI 53checked Oct. 13, 2026
Certified for: Lead
Brita Everyday Pitcher with Elite Filter (OB46, OB06)
Pitcher
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 401checked Oct. 13, 2026
Certified for: Lead
PUR PLUS 11-Cup Pitcher (PPT111W)
Pitcher
- NSF listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 401checked Oct. 4, 2026
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 401checked Oct. 4, 2026
- IAPMO listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 401checked Oct. 4, 2026
Certified for: Lead
Water testing near Loyola
The 3 labs California certifies closest to Loyola, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Torrent Laboratory, Inc
Milpitas, CA · about 12 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts, PFAS
AEMTEK, Inc
Fremont, CA · about 13 miles
Certified for bacteria, minerals and other inorganics
San Mateo County Public Health Laboratory
San Mateo, CA · about 17 miles
Certified for bacteria
ZIP codes in Loyola
Which ZIP codes are in Loyola: 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 Loyola
Other towns in Santa Clara County with a page of their own.
What to do next
- Read Cwsc Los Altos Suburban’s full reportEvery result with its dates, the violations, and the certification claim that handles each finding.Open the report
- Filters for LeadRanked by certification and what they cost over five years.The best water filters for lead, ranked
- On a private well?No utility tests a well. A certified lab test is the first step.How to test well water