Clearlake, California: Is the Tap Water Safe to Drink?
2026 EPA water quality data for 2 community water systems serving 13,700+ residents. See violations, PFAS results, lead test results, and safety grades — free.
Is Clearlake Tap Water Safe to Drink?
Based on the latest EPA data, Clearlake tap water meets all federal drinking water standards. All 2 tested systems have received a safety grade of A or B, with no active health-based violations. 1 system has been tested for PFAS (forever chemicals).
Clearlake Water Quality Overview
Clearlake, California is served by 2 community water systems providing water to approximately 13,700 residents. These systems draw from surface water sources. Clearlake water systems have recorded 10 health-based violations in their history, though none are currently active. Including monitoring and reporting violations, there are 13 total violations on record.
Find Your Water System
Search by ZIP code to find your exact water provider and see its full EPA report.
All 2 water systems in Clearlake
Looking for water quality data across the whole state? See our full California tap water safety report covering California’s EPA-regulated water systems.
Clearlake Drinking Water: Frequently Asked Questions
Is Clearlake, California tap water safe to drink?
Based on the latest EPA data, Clearlake tap water meets all federal drinking water standards. All 2 tested systems have received a safety grade of A or B, with no active health-based violations. 1 system has been tested for PFAS (forever chemicals).
How many water utilities serve Clearlake, California?
2 community water systems serve Clearlake, California, providing water to approximately 13,700 people. Different neighborhoods may be served by different utilities. Enter your ZIP code at the top to find your specific provider.
Does Clearlake 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 Clearlake drinking water?
EPA violation records for Clearlake 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 Clearlake?
Enter your Clearlake 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).