Is Lakeport, CA tap water safe?
The short answer
1 of the 5 utilities serving Lakeport has a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and California’s records: Pier 1900 Homeowner'S Association.
City of Lakeport, which serves the most people here, has 1 result above the health goal and 1 result above EPA’s health benchmark. The worst: Lithium at 18 ppb, above EPA’s health benchmark. Health goals are stricter than legal limits and are not enforced.
The water from City of Lakeport is moderately hard to very hard depending on the source, 96 to 183 mg/L (5.6 to 10.7 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 Lakeport’s ZIP codes, from EPA’s estimates.
- Open report
City of Lakeport
California · serves 4,762 people · about 170 in Lakeport
1 result above the health goal and 1 result above EPA’s health benchmark. The worst: Lithium at 18 ppb, above EPA’s health benchmark. Hardness: moderately hard to very hard depending on the source, 96 to 183 mg/L (5.6 to 10.7 grains per gallon).
No health-based violations since 2016
- Open report
Lake County CSA 21 - North Lakeport
California · serves 4,046 people · about 130 in Lakeport
1 result above the health goal. The worst: Arsenic at 8.9 ppb, above the health goal. Hardness: hard, typically 141 mg/L (8.3 grains per gallon).
No health-based violations since 2016
- Open report
Corinthian Bay Mutual Water Company
California · serves 75 people · under 100 in Lakeport
Nothing in its records is above a health goal. Hardness: hard, typically 141 mg/L (8.2 grains per gallon).
No health-based violations since 2016
- Open report
Pier 1900 Homeowner'S Association
California · serves 152 people · under 100 in Lakeport
Nothing in its records is above a health goal. Hardness: hard, 140 mg/L (8.2 grains per gallon).
1 health-based violation since 2016
- Open report
Kelseyville Co Waterworks District 3
California · serves 4,102 people · based in Lakeport
1 result above the health goal. The worst: Lead at 5.2 ppb, above the health goal. Hardness: moderately hard to hard depending on the source, 112 to 163 mg/L (6.5 to 9.5 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 City of Lakeport’s water, which serves the most people here. Another utility’s report names what handles its own results.
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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 Lakeport
The 3 labs California certifies closest to Lakeport, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Alpha Analytical Laboratories, Inc. - Ukiah
Ukiah, CA · about 16 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts, radioactivity
K Prime, LLC.
Santa Rosa, CA · about 38 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, PFAS
Sonoma County Public Health Laboratory
Santa Rosa, CA · about 42 miles
Certified for bacteria
ZIP codes in Lakeport
Which ZIP codes are in Lakeport: 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 Lakeport
Other towns in Lake County with a page of their own.
What to do next
- Read City of Lakeport’s full reportEvery result with its dates, the violations, and the certification claim that handles each finding.Open the report
- About LithiumWhat it does to health, where it comes from, and the certification claim that addresses it.About Lithium
- On a private well?No utility tests a well. A certified lab test is the first step.How to test well water