Los Altos, California: Is the Tap Water Safe to Drink?
2026 EPA water quality data for 1 community water system serving 200+ residents. See violations, PFAS results, lead test results, and safety grades — free.
Is Los Altos Tap Water Safe to Drink?
Based on the latest EPA data, Los Altos tap water meets all federal drinking water standards. All 1 tested system has received a safety grade of A or B, with no active health-based violations.
Los Altos Water Quality Overview
Los Altos, California is served by 1 community water system providing water to approximately 200 residents. The system draws from groundwater sources. Los Altos water systems have no recorded health-based violations. Including monitoring and reporting violations, there are 6 total violations on record.
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All 1 water system in Los Altos
Looking for water quality data across the whole state? See our full California tap water safety report covering California’s EPA-regulated water systems.
Los Altos Drinking Water: Frequently Asked Questions
Is Los Altos, California tap water safe to drink?
Based on the latest EPA data, Los Altos tap water meets all federal drinking water standards. All 1 tested system has received a safety grade of A or B, with no active health-based violations.
How many water utilities serve Los Altos, California?
1 community water system serves Los Altos, California, providing water to approximately 200 people. Different neighborhoods may be served by different utilities. Enter your ZIP code at the top to find your specific provider.
Does Los Altos tap water have lead?
Lead in drinking water typically enters from old pipes and fixtures inside homes and buildings, not from the treatment plant. The EPA requires water systems to monitor for lead under the Lead and Copper Rule. Click any water system above to see its most recent 90th-percentile lead test results. Homes built before 1986 are most likely to have lead plumbing components.
What contaminants have been found in Los Altos drinking water?
EPA violation records for Los Altos water systems are listed on each utility's report page. Common regulated contaminants include disinfection byproducts (TTHMs, HAA5), coliform bacteria, nitrates, and lead. Click any utility above to see its full violation history going back 10 years.
How do I find out which water company serves my address in Los Altos?
Enter your Los Altos ZIP code in the search box at the top of this page. ClearWater will identify the specific water system serving your area and show you its EPA violation history, lead test results, and an overall safety grade. You can also check your water bill or your utility's annual Consumer Confidence Report (CCR).