Delaware, Ohio: Is the Tap Water Safe to Drink?
2026 EPA water quality data for 9 community water systems serving 196,241+ residents. See violations, PFAS results, lead test results, and safety grades — free.
Is Delaware Tap Water Safe to Drink?
Based on the latest EPA data, Delaware tap water meets all federal drinking water standards. All 9 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).
Delaware Water Quality Overview
Delaware, Ohio is served by 9 community water systems providing water to approximately 196,241 residents. These systems draw from groundwater (7), surface water (2) sources. Delaware water systems have no recorded health-based violations. Including monitoring and reporting violations, there are 10 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 9 water systems in Delaware
Looking for water quality data across the whole state? See our full Ohio tap water safety report covering Ohio’s EPA-regulated water systems.
Delaware Drinking Water: Frequently Asked Questions
Is Delaware, Ohio tap water safe to drink?
Based on the latest EPA data, Delaware tap water meets all federal drinking water standards. All 9 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 Delaware, Ohio?
9 community water systems serve Delaware, Ohio, providing water to approximately 196,241 people. Different neighborhoods may be served by different utilities. Enter your ZIP code at the top to find your specific provider.
Does Delaware 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 Delaware drinking water?
EPA violation records for Delaware 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 Delaware?
Enter your Delaware 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).