Watertown, Massachusetts: Is the Tap Water Safe to Drink?
2026 EPA water quality data for 2 community water systems serving 35,419+ residents. See violations, PFAS results, lead test results, and safety grades — free.
EPA data last updated: 2026-06-23
Is Watertown Tap Water Safe to Drink?
Based on the latest EPA data, Watertown 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.
Watertown Water Quality Overview
Watertown, Massachusetts is served by 2 community water systems providing water to approximately 35,419 residents. These systems draw from surface water purchased (1), groundwater (1) sources. Watertown water systems have recorded 4 health-based violations in their history, though none are currently active. Including monitoring and reporting violations, there are 5 total violations on record.
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All 2 water systems in Watertown
Looking for water quality data across the whole state? See our full Massachusetts tap water safety report covering Massachusetts’s EPA-regulated water systems.
Watertown Drinking Water: Frequently Asked Questions
Is Watertown, Massachusetts tap water safe to drink?
Based on the latest EPA data, Watertown 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.
How many water utilities serve Watertown, Massachusetts?
2 community water systems serve Watertown, Massachusetts, providing water to approximately 35,419 people. Different neighborhoods may be served by different utilities. Enter your ZIP code at the top to find your specific provider.
Does Watertown 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 Watertown drinking water?
EPA violation records for Watertown 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 Watertown?
Enter your Watertown 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).