This site provides Connecticut’s local health departments (LHDs) access to important information on public water systems including maximum contamination level (MCL) violations and monitoring and reporting (M/R) violations these systems incur. The site also provides forms to facilitate and standardize communications between the Drinking Water Section (DWS) and LHDs on matters of joint concern or jurisdiction.  

Public Water System Classifications and Inventory

Click here to view the classifications of public water systems (PWS) and the criteria for each classification.

Maximum Contaminant Level (MCL) and Monitoring and Reporting (M/R) Violations and Food Service Establishment Report

In the dropdown menu below you may select your respective health department or district and click ‘Go!’ to obtain a printable list of PWSs that have received MCL and/or M/R violations in the past 12 months. The report also contains an up to date list by health department of all of the food service establishment/PWSs in the DWS inventory.  This list is for informational purposes only and is updated monthly. All PWSs are required by regulation to report any MCL violation they incur directly to the LHD.  Please report any inventory errors to the DWS.

Public Water System Screening Form

This form is used to determine if a proposed project or a change in operation at an existing facility will result in the creation of a new water company or public water system or change the status of an existing public water system.

Guidance Documents

Miscellaneous Information

Below are links to information that may be useful to LHDs related to PWSs: