San Marino, California: Is the Tap Water Safe to Drink?
2026 EPA water quality data for 1 community water system serving 104+ residents. See violations, PFAS results, lead test results, and safety grades — free.
Is San Marino Tap Water Safe to Drink?
Based on the latest EPA data, San Marino 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.
San Marino Water Quality Overview
San Marino, California is served by 1 community water system providing water to approximately 104 residents. The system draws from groundwater sources. San Marino water systems have no recorded health-based violations. Including monitoring and reporting violations, there are 8 total violations on record.
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All 1 water system in San Marino
Looking for water quality data across the whole state? See our full California tap water safety report covering California’s EPA-regulated water systems.
San Marino Drinking Water: Frequently Asked Questions
Is San Marino, California tap water safe to drink?
Based on the latest EPA data, San Marino 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 San Marino, California?
1 community water system serves San Marino, California, providing water to approximately 104 people. Different neighborhoods may be served by different utilities. Enter your ZIP code at the top to find your specific provider.
Does San Marino 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 San Marino drinking water?
EPA violation records for San Marino 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 San Marino?
Enter your San Marino 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).