Mountain House, California: Is the Tap Water Safe to Drink?
2026 EPA water quality data for 1 community water system serving 24,948+ residents. See violations, PFAS results, lead test results, and safety grades — free.
Is Mountain House Tap Water Safe to Drink?
Based on the latest EPA data, Mountain House 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.
Mountain House Water Quality Overview
Mountain House, California is served by 1 community water system providing water to approximately 24,948 residents. The system draws from surface water sources. Mountain House water systems have no recorded health-based violations.
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All 1 water system in Mountain House
Looking for water quality data across the whole state? See our full California tap water safety report covering California’s EPA-regulated water systems.
Mountain House Drinking Water: Frequently Asked Questions
Is Mountain House, California tap water safe to drink?
Based on the latest EPA data, Mountain House 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 Mountain House, California?
1 community water system serves Mountain House, California, providing water to approximately 24,948 people. Different neighborhoods may be served by different utilities. Enter your ZIP code at the top to find your specific provider.
Does Mountain House 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 Mountain House drinking water?
EPA violation records for Mountain House 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 Mountain House?
Enter your Mountain House 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).