Question 1

Which county in Connecticut has the best water quality?

Accepted Answer

See the county rankings below for water quality across Connecticut.

Question 2

Which county in Connecticut has the most water violations?

Accepted Answer

See the county rankings below for water violation data across Connecticut.

Question 3

Is the tap water safe to drink in Connecticut?

Accepted Answer

Water quality data for Connecticut counties is available in the table below. Always check your local water utility's consumer confidence report for the most current data.

Question 4

What contaminants are found in Connecticut water supplies?

Accepted Answer

Drinking water quality varies by county and water system. The EPA Safe Drinking Water Information System (SDWIS) tracks violations for contaminants like lead, nitrates, bacteria, and disinfection byproducts. See individual county pages for specific contaminant and violation history.

County	Water Score	Grade	Violations	Violation Rate
Capitol Planning Region	—	—	—	—
Greater Bridgeport Planning Region	—	—	—	—
Lower Connecticut River Valley Planning Region	—	—	—	—
Naugatuck Valley Planning Region	—	—	—	—
Northeastern Connecticut Planning Region	—	—	—	—
Northwest Hills Planning Region	—	—	—	—
South Central Connecticut Planning Region	—	—	—	—
Southeastern Connecticut Planning Region	—	—	—	—
Western Connecticut Planning Region	—	—	—	—

Connecticut Water Quality

All Connecticut Counties

Concerned about your water quality?

Explore more data for Connecticut