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.
- Presence of Total Coliform Bacteria in the Water Supply at Food Service Establishments - Guidance Document developed by CTDPH, CADH and CEHA. This document was developed to provide procedural guidelines to be followed by LHDs when a food service establishment, under LHD jurisdiction exceeds the monthly MCL for E. coli or fecal coliform bacteria.
- Fact Sheet for Local Health Departments Presence of Total Coliform or Fecal Coliforms/E. coli Bacteria in the Water Supply at Food Service Establishments
- Dumpsters - The Drinking Water Section has finalized two documents to aid water systems, local health departments and the public in determining how to minimize the impact that dumpsters may have on public water supply wells and to determine if the dumpster on a property is in compliance with the Regulations of Connecticut State Agencies. Please click on the links to view the guidance document and best management practices.
Below are links to information that may be useful to LHDs related to PWSs:
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Checklist for Licensing Food Service Establishments with Onsite Wells - This checklist which was originally presented at a Department of Public Health Drinking Water Section training event on October 12, 2010 is suggested for use by local health departments when initially licensing or when re-licensing food service establishments. Please contact Vicky Carrier of the Drinking Water Section via email (vicky.carrier@ct.gov ) or telephone at 860-509-7333 extension 7315 if you have any questions or comments.