Circular Letters

2024

• Circular Letter 2024-30 - Community Water Fluoridation: Principles and Practices Training (Virtual)
• Circular Letter 2024-25 - Drinking Water State Revolving Fund (DWSRF) – Public Hearing Announcement for State Fiscal Year 2025 Intended Use Plan and Project Priority List
• Circular Letter 2024-18 - Drinking Water Volatile Organic Method Field Reagent Blank
• Circular Letter 2024-17 - EPA National Primary Drinking Water Rule for PFAS
• Circular Letter 2024-12 - Training - Final Lead and Copper Rule Revisions Initial Service Line Material Inventory Requirements
• Circular Letter 2024-11 - Reminder: Final Lead and Copper Rule Revisions Initial Service Line Material Inventory Requirements for all non-transient non-community (NTNC) PWS
• Circular Letter 2024-10 - Reminder: Final Lead and Copper Rule Revisions Initial Service Line Material Inventory Requirements for all Community PWS
• Circular Letter 2024-09 - DWSRF - Call for Projects - March 8 to April 26, 2024 - State Fiscal Year 2025
• Circular Letter 2024-08 - EPA Cybersecurity Webinars and Fact Sheet
• Circular Letter 2024-06 - BIL Learning Exchange Webinar Series: Addressing Emerging Contaminants in Source Water Using BIL Grants and Forgivable Loans
• Circular Letter 2024-04 - Important Reminder of Corrosion Control Treatment Residual Monitoring and Reporting Requirements
• Circular Letter 2024-03 - ASDWA Webinar Series: Navigating the Intricacies of PFAS Treatment, Granular Activated Carbon Treatment Strategies
• Circular Letter 2024-02 - Severe Weather Alert and Preparedness Reminder
• Circular Letter 2024-01 - EFCN Webinar | Infrastructure Funding Solutions: Exploring WIFIA and SRF Programs

2023

• Circular Letter 2023-51 - Proposed Lead and Copper Rule Improvements
• Circular Letter 2023-50 - EPA Water Technical Assistance: Helping Communities Access Funding Informational Webinar
• Circular Letter 2023-49 - Free Confidential Security Assessments for Community Public Water Systems; Upcoming Cybersecurity Webinar
• Circular Letter 2023-46 - Free EPA Webinar on an Update to the Fifth Unregulated Contaminant Monitoring Rule (UCMR 5)
• Circular Letter 2023-45 - CT DPH Lead & Copper Rule Revisions (LCRR) In-Person Lead Service Line Inventory - Small Systems Training (10/27/2023)
• Circular Letter 2023-44 - CT DPH Lead & Copper Rule Revisions (LCRR) In-Person Lead Service Line Inventory - Community Systems Training (11/01/2023)
• Circular Letter 2023-43 - Free EPA Webinar on Preparing Communities to Engage in EPA’s Upcoming Lead and Copper Rule Improvements Drinking Water Regulatory Process
• Circular Letter 2023-41 - Severe Weather Alert and Preparedness Reminder
• Circular Letter 2023-40 - Medium Cybersecurity Advisory: Barracuda ESG Vulnerability
• Circular Letter 2023-39 - Cybersecurity Reminder and Updates
• Circular Letter 2023-38 - Drinking Water State Revolving Fund (DWSRF) – Public Hearing Announcement for State Fiscal Year 2024 Intended Use Plan and Project Priority List
• Circular Letter 2023-34 - EPA UCMR 5 First Data Release
• Circular Letter 2023-33 - Lead and Copper Rule Revisions Final Material Inventory Template
• Circular Letter 2023-29 - CDC Water Flouridation Online Training - Course Training Contact Hour Opportunity
• Circular Letter 2023-28 - EPA Release of Service Line Inventory Fact Sheet and Small Entity Compliance Guidance
• Circular Letter 2023-26 - Drinking Water State Revolving Fund – State Fiscal Year 2023 Intended Use Plan and Hearing Report – Now Final
• Circular Letter 2023-24 - Drinking Water Action Level for Six Per- and Polyfluoroalkyl Substances (PFAS)
• Circular Letter 2023-23 - Updated drinking water information regarding Per- and Polyfluoroalkyl Substances (PFAS)
• Circular Letter 2023-21 - Lead and Copper Rule and Revised Total Coliform Rule Sampling Point Requirements
• Circular Letter 2023-20 - Free EPA Webinar on Bipartisan Infrastructure Law 
• Circular Letter 2023-19 - Free EPA Webinar on Supporting Private Lead Service Line Replacement with the Drinking Water State Revolving Fund
• Circular Letter 2023-18 - Release of Lead-Based Paint Chips from Bridge Structures
• Circular Letter 2023-13 - Free EPA Small Drinking Water Systems Webinar on Lead and Copper
• Circular Letter 2023-12 - EPA Draft Rule for Per- and Polyfluoroalkyl Substances (PFAS)
• Circular Letter 2023-11 - Severe Weather Alert and Preparedness Reminder
• Circular Letter 2023-06 - Reinstatement of Licensure Renewal Requirements
• Circular Letter 2023-05 - Drinking Water State Revolving Fund (DWSRF) and Bipartisan Infrastructure Law (BIL) - CALL FOR PROJECTS for State Fiscal Year 2024
• Circular Letter 2023-04 - Drinking Water State Revolving Fund (DWSRF) State Fiscal Year 2023
  New Draft Intended Use Plan and Project Priority List

2022     

• Circular Letter 2022-77 - Severe Weather Preparedness Reminder
• Circular Letter 2022-76 - CT Interagency Per- and Polyfluoroalkyl Substances (PFAS) Task Force’s PFAS Action Plan Three Year Review
• Circular Letter 2022-74 - Free ASDWA Webinar Series: Implementation Tools and Best Practices for LSL Inventories and LSLR 
• Circular Letter 2022-73 - EPA NDWAC Virtual Meeting on the LCRI
• Circular Letter 2022-72 - LSLR Collaborative’s Guide to Equity Analysis
• Circular Letter 2022-70 - Extension of Order of Reinstatement of Licensure Renewal Requirements
• Circular Letter 2022-69 - Testimony or Comments on the DPH Drinking Water State Revolving Fund SFY 2023 Draft Intended Use Plan
• Circular Letter 2022-68 - Watershed Inspector Certificate Training on November 8, 2022 (Training Contact Hour opportunity)
• Circular Letter 2022-65 - Drinking Water State Revolving Fund – SFY 2023 Intended Use Plan and Project Priority List
• Circular Letter 2022-64 - Fifth Unregulated Contaminant Monitoring Rule Public Webinar Registration
• Circular Letter 2022-63 - Reinstatement of Licensure Renewal Requirements - 29 Days to November 10, 2022
• Circular Letter 2022-62 - Well Drilling and Geothermal System Regulations
• Circular Letter 2022-61 - Reinstatement of Licensure Renewal Requirements - 38 Days (from 10/04/2022)
• Circular Letter 2022-60 - Changes to Private Well Testing Laws – CGS Sec. 19a-37
• Circular Letter 2022-59 - CISA and FBI Advisory on Iranian State Actors Conduct Cyber Operations Against the Government of Albania
• Circular Letter 2022-58 - Connecticut Capacity Development Strategy
• Circular Letter 2022-55 - Water and Wastewater Sector Supply Chain Resilience
• Circular Letter 2022-53 - RTCR 2022 Level 2 Assessor Training (Training Contact Hour Opportunity)
• Circular Letter 2022-51 - Stage 3 Drought Declaration for Windham and New London Counties
• Circular Letter 2022-50 - Food Protection Program Updates: Food Inspector Certification Training Opportunities
• Circular Letter 2022-49 - Reporting of Water Hauling to Resupply Private Wells
• Circular Letter 2022-48 - Reinstatement of Licensure Requirements
• Circular Letter 2022-47 - CT DPH CTEDSS Training Series: Training for Itinerant Food Vendor MOU
• Circular Letter 2022-46 - CISA Webinar - The Importance of Multi-factor Authentication
• Circular Letter 2022-45 - Monthly Drinking Water Webinar Series
• Circular Letter 2022-41 - EPA Release of LSL Inventory Guidance
• Circular Letter 2022-37 - Stage 2 Drought Declared in All Eight Counties of CT
• Circular Letter 2022-36 - Upcoming Webinars on Bipartisan Infrastructure Law Funding and Disaster Response Funding
• Circular Letter 2022-35 - Lead and Copper Rule Revisions Material Inventory Template (Excel Template)
• Circular Letter 2022-30 - Updated drinking water information regarding Per- and Polyfluoroalkyl Substances (PFAS)
• Circular Letter 2022-29 - Updated Drinking Water Action Level for Per- and Polyfluoroalkyl Substances (PFAS)
• Circular Letter 2022-28 - Drying Conditions Update
• Circular Letter 2022-27 - Environmental Health and Drinking Water Branch Update for Public Water Systems regarding Per- and Polyfluoroalkyl Substances (PFAS)
• Circular Letter 2022-26 - Joint Cybersecurity Advisory: Weak Security Controls and Practices Routinely Exploited for Initial Access
• Circular Letter 2022-25 - CT DPH Commissioner’s Order 5-5-2022 – Reinstatement of Licensure Renewal Requirements
• Circular Letter 2022-24 - Low-Income Household Water Assistance Program (LIHWAP)
• Circular Letter 2022-23 - 2nd Reminder: Drinking Water State Revolving Fund (DWSRF) - SFY 2023 Call For Projects Announcement
• Circular Letter 2022-22 - Cybersecurity and Infrastructure Security Agency (CISA) Unclassified Broad Stakeholder Call
• Circular Letter 2022-19 - Mitigating Threats Posed by Russian State-Sponsored Cyber Actors
• Circular Letter 2022-18 - Announcement of EPA Region 1’s 2022 Lead Pipe Inventory and Public Engagement (LPIPE) Demonstration Grant Program Funding
• Circular Letter 2022-17 - Environmental Protection Agency issues Bipartisan Infrastructure Law (BIL) Implementation Memo and Fact Sheet
• Circular Letter 2022-15 - Connecticut Drinking Water, Public Health, and Healthcare Coordination Workshop
• Circular Letter 2022-14 - Free Water Sector Security Culture Webinar Series
• Circular Letter 2022-13 - Potential Cyber Threat to United States Critical Infrastructure due to Geopolitical Tensions
• Circular Letter 2022-12 - WEBEOC Virtual Training Opportunity
• Circular Letter 2022-11 - Severe Weather Preparedness Reminder – Northeast Winter Storm
• Circular Letter 2022-09 - Drinking Water State Revolving Fund (DWSRF) including Bipartisan Infrastructure Law (BIL) Funding
• Circular Letter 2022-08 - ASDWA Lead Service Line Inventory Symposium
• Circular Letter 2022-05 - EPA Announces Decision for the Lead and Copper Rule Revision (LCRR)
• Circular Letter 2022-04 -  Fifth Unregulated Contaminant Monitoring Rule
• Circular Letter 2022-03 - Bipartisan Infrastructure Law (BIL) Funding for State Drinking Water State Revolving Fund (DWSRF) Programs
• Circular Letter 2022-02 - Connecticut General Statutes Section 25-33q - High Quality Sources of Public Drinking Water

2021

• Circular Letter 2021-97 - Cybersecurity Reminder and upcoming Webinars
• Circular Letter 2021-95 - PWS Vulnerability Assessment Notice
• Circular Letter 2021-91 - Connecticut Low-Income Household Water Assistance Program (LIHWAP)
• Circular Letter 2021-89 - Emergency Response Planning and Cybersecurity Risk Self-Assessment
• Circular Letter 2021-88 - Important Survey - Supply Shortage in Water Treatment Chemical and Water System Components
• Circular Letter 2021-87 - Bottled Water Sources to Sample for Unregulated Contaminants
• Circular Letter 2021-86 - Effective October 1, 2021 Statutory Requirement to provide Electronic Notification to DPH for project application
• Circular Letter 2021-84 - Tenant Notification Requirement
• Circular Letter 2021-83 - Bulk Water Hauling Requirements Reminder
• Circular Letter 2021-82 - 24-Hour Notification Requirement for Test Results Showing Contaminants
• Circular letter 2021-79 - WebEOC requirement for Community Water Systems (CWS) in reporting operational status (during civil preparedness or public health emergency declaration).
• Circular Letter 2021-78 - Tier 1 written notification (in three most predominantly spoken languages).
• Circular letter 2021-77 - New Notifications Fee Request Refund Form
• Circular Letter 2021-74 - Public Act 21-121 - providing potable water for service interruptions longer than twelve hours.
• Circular Letter 2021-73 - RCSA ACM Definition Change
• Circular Letter 2021-67 - EPA's Introduction to Cybersecurity Virtual Workshop (Free of Cost)
• Circular Letter 2021-66 - Drought Response and Water Loss Workshop (at no cost) for Water Utilities
• Circular Letter 2021-65 - Free Drought Response and Water Loss Workshop for Water Utilities 
• Circular Letter 2021-63 - Severe Weather Reminder – Tropical Storm Henri
• Circular Letter 2021-62 - Resources, Guidance, and Emergency Response for Natural Disasters
• Circular Letter 2021-61 - Severe Weather Preparedness Reminder – Tropical Storm Henri
• Circular Letter 2021-60 - Memorandum from the White House on National Security - Cybersecurity
• Circular Letter 2021-59 - LIHWAP Survey for the Community Public Water Systems
• Circular Letter 2021-58 - Private Well Parcel Mapping
• Circular Letter 2021-57 - Reducing the Risk of Legionella Growth in Water Distribution System
• Circular Letter 2021-56 - Return to Service Guidance
• Circular Letter 2021-54 - Drinking Water State Revolving Fund (DWSRF) – Approval of Class Exception (aka Deviation) from the Regulatory Prohibitions on the use of DWSRF for Rehabilitation of Dams and Reservoirs
• Circular Letter 2021-52 - Public Hearing Announcement for SFY 2022 Intended Use Plan and Project Priority List
• Circular Letter 2021-49 - Severe Weather Preparedness Reminder – Tropical Storm Elsa
• Circular Letter 2021-48 - Cybersecurity Preparedness - Ransomware Readiness Assessment (RRA)
• Circular Letter 2021-43 - Free Cybersecurity Assessment and Technical Assistance
• Circular Letter 2021-41 - Cybersecurity Preparedness
• Circular Letter 2021-40 - Release of 3 new tools for the 3Ts toolkit
• Circular Letter 2021-39 - Congressionally Directed Spending Requests
• Circular Letter 2021-35 - Lead-Free Water Challenge Program for the Replacement of Lead Service Lines
• Circular Letter 2021-33 - New England Water Sector Cybersecurity Forum
• Circular Letter 2021-29 - EPA Hosting Virtual Engagements for the Lead and Copper Rule Revisions
• Circular Letter 2021-27 - Important Information for Non-Community PWS in Anticipation of Resuming Daily Business Operations
• Circular Letter 2021-26 - Return to Service Guidance for Closed and Partially Closed Facilities served by Community Public Water Systems
• Circular Letter 2021-20 - Drinking Water State Revolving Fund – Lead Service Line Replacement
  Eligibility Application deadline extended to April 16, 2021
• Circular Letter 2021-19 - Questionnaire on Analytical Methods Used by Certified Operators
• Circular Letter 2021-18 - Orthophosphate and Total Phosphate reporting
• Circular Letter 2021-15 - Proficiency Tests
• Circular Letter 2021-14 - Remote Administration for Water Operator Certification Exams
• Circular Letter 2021-12 - Cybersecurity - Be Vigilant!
• Circular Letter 2021-10 - Reduction in Frequency of Reporting of Groundwater Capacity Monitoring
• Circular Letter 2021-09 - Severe Weather Preparedness Reminder – Winter Storm
• Circular Letter 2021-07 - Drinking Water State Revolving Fund and Potential Federal Infrastructure Stimulus Bill - CALL FOR PROJECTS for State Fiscal Year 2022
• Circular Letter 2021-06 - Cybersecurity and Physical Security Updates
• Circular Letter 2021-05 - Determination of the Method Detection Limit (MDL)
• Circular Letter 2021-03 - SolarWinds Software Incident of December 2019
• Circular Letter 2021-02 - USDA/AWWA FREE Small Systems Workshop - Cybersecurity and Accessing Funding
• Circular Letter 2021-01 - Prohibition on Certain Telecommunication and Video Surveillance Services or Equipment in the SRF Programs

2020

• Circular Letter 2020-87 - Severe Weather Preparedness Reminder – Winter Storm
• Circular Letter 2020-83 - Sampling Point and Analytical Method Reporting Requirements
• Circular Letter 2020-82 - Mass Vaccination Planning for COVID-19 - Certified Environmental Laboratories
• Circular Letter 2020-78 - Mass Vaccination Planning for COVID-19
• Circular Letter 2020-75 - Drinking Water State Revolving Fund – Public Hearing Report on the State Fiscal Year 2021 Intended Use Plan and Project Priority List
• Circular Letter 2020-73 - Drought Situation 2020 - Water Supply Capacity Reports, Bulk Water Hauling, and Begin Conservation Notification
• Circular Letter 2020-72 - Governor’s Council on Climate Change (GC3) Public Health and Safety Workgroup Climate Forum on October 7, 2020
• Circular Letter 2020-63 - Drinking Water Guidance for Schools and Childcare Facilities When Re-Opening After Extended Closures
• Circular Letter 2020-60 - Bulk Water Hauling During Emergencies
• Circular Letter 2020-59 - Temporary Drinking Water Filling Station Guidance
• Circular Letter 2020-57 - Severe Weather Preparedness Reminder – Hurricane Isaias
• Circular Letter 2020-56 - Service Connections for the Safe Drinking Water Primacy Assessment
• Circular Letter 2020-54 - Reporting important measures for reservoir, ground water and water use monitoring in dry weather
• Circular Letter 2020-51 - Return to Service Guidance -Phase II Reopening to CWSs
• Circular Letter 2020-50 - Reminder about the Return to Service Guidance -Phase II Reopening to NCWSs
• Circular Letter 2020-49 - Drying Conditions Update
• Circular Letter 2020-46 - Available Distance Learning Education Training
• Circular Letter 2020-37 - Environmental Laboratory Proficiency Testing Extension During the COVID-19 Pandemic 
• Circular Letter 2020-36 - Important Information for Non-Community PWS in Anticipation of Resuming Daily Business Operations
• Circular Letter 2020-35 - Announcement for Fiscal & Management Plan Template Training Webinar
• Circular Letter 2020-34 - COVID-19 - Lead & Copper Rule Water Quality Monitoring & Precautions Guidance
• Circular Letter 2020-33 - Return to Service Guidance for Closed and Partially Closed Facilities served by Community Public Water Systems
• Circular Letter 2020-32 - Watershed and Cross Connection Inspections
• Circular Letter 2020-29 - DRINKING WATER PROJECTS FUNDING AVAILABLE - Drinking Water State Revolving Fund (DWSRF) – CALL FOR PROJECTS for State Fiscal Year 2021 Financing
• Circular Letter 2020-26 - Important Information for Community PWS Serving Less Than 1000 People During the COVID-19 Crisis and Follow Up to Phone Calls
• Circular Letter 2020-19 - Important Information for Environmental Laboratories During the COVID-19 Crisis
• Circular Letter 2020-18 - Social Distancing at Public Water System Recreational Areas
• Circular Letter 2020-17 - Important Information for Non-Community PWS During the COVID-19 Crisis
• Circular Letter 2020-16 - Important Information for Community PWS During the COVID-19 Crisis
• Circular Letter 2020-14 - Environmental Laboratory Preparedness – COVID 19
• Circular Letter 2020-13 - CALL FOR PROJECTS for State Fiscal Year 2021 Financing – DEADLINE EXTENDED to April 30
• Circular Letter 2020-12 - COVID-19 for Water Utilities Webinar #2
• Circular Letter 2020-11 - COVID-19 for Water Utilities Webinar #1
• Circular Letter 2020-10 - Governor Lamont Announces 211 Infoline for COVID-19
• Circular Letter 2020-09 - Emergency Preparedness for Coronavirus
• Circular Letter 2020-08 - Water Infrastructure Improvements for the Nation (WIIN) Act- $40 Million Reduction in Lead Exposure via Drinking Water Grant
• Circular Letter 2020-07 - Climate & Weather Information for Utilities Workshop
• Circular Letter 2020-06 - Fiscal and Asset Management Plan Requirement for Small CWS
• Circular Letter 2020-05 - DRINKING WATER PROJECTS FUNDING AVAILABLE - Drinking Water State Revolving Fund (DWSRF) – CALL FOR PROJECTS for State Fiscal Year 2021 Financing
• Circular Letter 2020-04 - Invitation to Stakeholder Discussion on Water Service Interruption and Reporting Protocol
• Circular Letter 2020-03 - Updated Public Water Screening Form
• Circular Letter 2020-02 - Risk & Resilience Assessments and Emergency Response Plans per AWIA Requirements
• Circular Letter 2020-01 - Drinking Water State Revolving Fund – Public Hearing Report on the State Fiscal Year 2020 Intended Use Plan and Project Priority List

2019

• Circular Letter 2019-27 - Critical Infrastructure Security and Resilience Month
• Circular Letter 2019-26 - DPH Drinking Water Section Webinar - Water Service Incident Response & Notification
• Circular Letter 2019-24 - Resilient Connecticut Climate Adaption Summit - November 12, 2019
• Circular Letter 2019-23 - Drinking Water State Revolving Fund (DWSRF)- Public Hearing and Webinar Announcement for SFY 2020 Intended Use Plan and Project Priority List
• Circular Letter 2019-21 - Review of Water Supply Emergency Contingency Plan Procedures and Security Measures
• Circular Letter 2019-20 - Safe Drinking Water Primacy Assessment – Cost per service connection & Invoicing Schedule for State Fiscal Year 2020
• Circular Letter 2019-19 - Manganese (Mn) Results of Water Testing
• Circular Letter 2019-18 - Request to Sample Bottled Water Sources for Perfluoroalkyl Substances (PFAS)
• Circular Letter 2019-18 - FREE USDA/AWWA Workshop on Optimizing Performance & Accessing Funding to Improve Small Systems
• Circular Letter 2019-17 - Free Workshop in RI & CT -  Sustainable Management of Rural and Small Systems
• Circular Letter 2019-16 - Connecticut Cyber Security Reporting
• Circular Letter 2019-15 - Emergency Notification Protocol
• Circular Letter 2019-14 - Service Connections for the Safe Drinking Water Primacy Assessment
• Circular Letter 2019-13 - Updated Material Evaluation and Sampling Site Plan
• Circular Letter 2019-11 - Flushing Drinking Water Taps to Reduce Lead
• Circular Letter 2019-10 - Reminder for Hydropneumatic Tank Assessments which are due on 05/02/2019
• Circular Letter 2019-08 - Reducing Disinfection Byproducts through Optimization – Webinar Series
• Circular Letter 2019-07 - Seasonal System Start-up Requirements
• Circular Letter 2019-06 - Lead Fact Sheet for Schools and Daycares and EPA's Updated 3Ts Reducing Lead in Drinking Water Toolkit
• Circular Letter 2019-05 - New England Get the Lead Out Summit: regarding Creative Strategies for Replacing Lead Lines Free Workshop, Westborough, MA
• Circular Letter 2019-04 - Infrastructure Act - Free Webinar for the Water Sector
• Circular Letter 2019-03 - Reminder to Complete Land Use Inventory Table Source Water PFAS Vulnerability Assessment (Standardized Spreadsheet Source Water PFAS Vulnerability Assessment Form)
• Circular Letter 2019-02 - Drinking Water State Revolving Fund (DWSRF) – CALL FOR PROJECTS for State Fiscal Year 2020 Financing
• Circular Letter 2019-01 - New Fiscal and Asset Management Plan Requirements for Small CWS Including Prioritized Hydropneumatic Tank Assessment

2018

• Circular Letter 2018-29 - Prompt Electronic Reporting and Transition to the Compliance Monitoring Data Portal
• Circular Letter 2018-28 - Environmental Protection Agency (EPA) Toxicity Assessments for GenX Compounds and Perfluorobutane Sulfonic Acid (PFBS)
• Circular Letter 2018-27 - Subsidized Funding Opportunities for the Emergency Power Generators
• Circular Letter 2018-26 - WebEOC for Community Water Systems
• Circular Letter 2018-25 - Safe Drinking Water Primacy Assessment Invoicing (Community Systems)
• Circular Letter 2018-24 - “WebEOC Training for Public Water Systems: What, When and How”
• Circular Letter 2018-23 - CWS serving less than 10,000 people - Generator Requirements
• Circular Letter 2018-22 - WebEOC Training for Public Water Systems
• Circular Letter 2018-21 - New Asset and Fiscal Management Plan Requirements, Hydropneumatic Tank Requirements, Civil Penalties Revision
• Circular Letter 2018-20 - Requirement to Update an Evaluation of Source Water Protection Measures and Request to Sample Drinking Water Sources for Perfluoroalkyl Substances (PFAS)
• Circular Letter 2018-19 - Drinking Water Section Update for Public Water Systems regarding Per- and Polyfluoroalkyl Substances (PF AS)
• Circular Letter 2018-18 - Emergency Notification Requirements
• Circular Letter 2018-17 - Legionella Webinar
• Circular Letter 2018-16 - Drinking Water State Revolving Fund – Draft Intended Use Plan for State Fiscal Year 2019 Available for Review and Comment
• Circular Letter 2018-15 - Safe Drinking Water Primacy Assessment - Cost per service connection & invoicing schedule for State Fiscal Year 2018/19
• Circular Letter 2018-13 - Subsidized funding opportunities for the required emergency power generators
• Circular Letter 2018-12 - School & Child Care Public Water Systems Lead & Copper Compliance
• Circular Letter 2018-11 - Water Distribution Requirements
• Circular Letter 2018-10 - Drinking Water Vulnerability Assessment and Resiliency Plan (DWVAR Plan) Community Water System (CWS) Resiliency Survey
• Circular Letter 2018-09 - Connecticut State Water Plan, Joint Legislative Committees Public Hearing
• Circular Letter 2018-08 - Interruption of Water Service
• Circular Letter 2018-07 - Service Connections
• Circular Letter 2018-06 - Seasonal System Start-up Requirements
• Circular Letter 2018-04 - Ice Jams, Flooding and Emergency Preparedness
• Circular Letter 2018-03 - Drinking Water State Revolving Fund - Call for Projects for State Fiscal Year 2019 Financing
• Circular Letter 2018-02 - Annual Update to the Commissioner of Public Health's High Quality Source (HQS) List
• Circular Letter 2018-01 - Emergency Preparedness Reminder to Community Public Water Systems

2017

• Circular Letter 2017-01 - 2016 Commissioner of Public Health's High Quality Source (HQS) List
• Circular Letter 2017-02 - Ground Water Monitoring and Reporting
• Circular Letter 2017-03 - Changes to the Priority Ranking System for the Drinking Water State Revolving Fund
• Circular Letter 2017-04 - Changes to the Drinking Water State Revolving Fund - Eligibility Applications for Funding May be Submitted at Any Time
• Circular Letter 2017-06- Lead and Copper Rule (LCR) - 90% Calculation - Certified Operator Responsibilities
• Circular Letter 2017-07- PWS Emergency Preparedness Reminder as Hurricane Season Approaches
• Circular Letter 2017-08- Emergency Preparedness Reminder to Large Public Water Systems
• Circular Letter 2017-09- Emergency Preparedness Reminder to Chief Operators
• Circular Letter 2017-12- The Unregulated Contaminant Monitoring Rule (UCMR 4) training webinar for the Safe Drinking Water Accession and Review System (SDWARS)
• Circular Letter 2017-13 - Funding for Fluoridation Equipment Available for Community Water Systems (CWSs)
• Circular Letter 2017-16 - Renewal of DPH Licenses for Bulk Water Haulers
• Circular Letter 2017-17 - Drinking Water State Revolving Fund - Finalized Intended Use Plan for State Fiscal Year 2018

2016

• Circular_Letter_2016-01 -  New Regulations regarding Generator and Emergency Contingency and Response Plan Requirements
• Circular Letter 2016-02 - 2015 Commissioner of Public Health's High Quality Source (HQS) List /Call for New Sources and Improved Geographic Data for the 2016 HQS List Update
• Circular Letter 2016-03 - Healthy Watersheds Consortium Grant Opportunity for Source Water Protection
• Circular Letter 2016-04 - Revised Total Coliform Rule (RTCR)
• Circular Letter 2016-05 - Bulk Water Hauling and DPH Approved Bulk Water Haulers
• Circular Letter 2016-06 - Public Act 14-98 Section 46: Public Water System Improvement Program
• Circular Letter 2016-07 - EPA Clarification of Recommended Tap Sampling Procedures for Purposes of the Lead and Copper Rule
• Circular Letter 2016-08 - DWSRF Project Signage Requirements
• Circular Letter 2016-09 -  Increasing Transparency in the Implementations of the Lead and Copper Rule and  Enhancing Efforts to Notify Residents Promptly of Lead Results
• Circular Letter 2016-10 - Application for a Well Permit Exception
• Circular Letter 2016-11 - Lead and Copper Rule (LCR)
• Circular Letter 2016-12 - Gov. Malloy Signs Legislation Updating Connecticut’s Community Water Fluoridation Law for New Federal Standards – Public Act 16-4 - Effective Date October 1, 2016  
• Circular Letter 2016-13 - Eligibility of Service Line Replacement Under the Drinking Water State Revolving Fund (DWSRF) Program
• Circular Letter 2016-14 - Official Convening of the Water Utility Coordinating Committees
• Circular Letter 2016-15 - List of Critical Public Drinking Water Facilities for Power Restoration
• Circular Letter 2016-16 - EPA Drinking Water Health Advisory for Two Perfluorinated Compounds
• Circular Letter 2016-17 - Generator Verification and Emergency and Contingency Plan Requirements
• Circular Letter 2016-18 - Legionnaires’ Disease Prevention and Water Systems
• Circular Letter 2016-19 - Webinar Explaining the Water Utility Coordinating Committee Process
• Circular Letter 2016-20 - Reservoir Supply Capacity & Water Conservation
• Circular Letter 2016-21 - Reminder to Increase Transparency in the Implementation of the Lead & Copper Rule
• Circular letter 2016-22 - Request for DWSRF Capital Budget Information for SFY 2018 and 2019
• Circular letter 2016-24 - Harmful Algal Blooms/ Potential Cyanotoxin Concerns 
• Circular Letter 2016-25 - WS Emergency Preparedness Reminder as Tropical Storm Hermine Approaches 
• Circular Letter 2016-26 – School & Child Care Public Water Systems Lead & Copper Rule Compliance
• Circular Letter 2016-27 - Reservoir Capacity Reporting  
• Circular Letter 2016-28 - Funding Eligibility of Drinking Water State Revolving Fund Construction Work
• Circular Letter 2016-29 - Webinar Explaining the Exclusive Service Area Declaration Process
• Circular Letter 2016-30 - Drought Watch Announcement    
• Circular Letter 2016-31 - New Electronic Reporting Requirements and Transition to the Compliance Monitoring Data Portal 
• Circular Letter 2016-32 - Connecticut Drinking Water Vulnerability Assessment

• Circular Letter 2015-01 - Commissioner of Public Health’s High Quality Source (HQS) List /Call for New Sources and Improved Geographical Location Data for the 2015 HQS List Update.
• Circular Letter 2015-02 - List of Critical Public Drinking Water Facilities for Power Restoration  
• Circular Letter 2015-03 - Application for a Bulk Water Hauler License.
• Circular Letter 2015-04 - Change in "Disadvantaged Business Enterprise" (DBE) Requirements in State Fiscal Year 2015 DWSRF Assistance Agreements under $100,000.
• Circular Letter 2015-05 - Environmental Protection Administration’s (EPA) Meeting on Cyanotoxins in Drinking Water for May 11, 2015   
• Circular Letter 2015-06 - Fluoridation – HHS/CDC announcement and CT Laws for adjusted water fluoridation
• Circular Letter 2015-07 - Toxins Associated with Harmful Algal Blooms in Drinking Water 
• Circular Letter 2015-08 - Water Utility Coordinating Committees – Planning Update   
• Circular Letter 2015-09 - Inspection of hydropneumatic storage tanks and asset management plans
• Circular Letter 2015-10 - Water Utility Coordinating Committees – Informational Meetings
• Circular Letter 2015-11 - No-cost Cyanotoxin Testing Available to Public Water Systems that Utilize Active Surface Water Reservoirs
• Circular Letter 2015-12 - Supply Capacity and Water Conservation
• Circular Letter 2015-13 - Representative Sampling of Groundwater Sources for Compliance Purposes
• Circular Letter 2015-14 - Hurricane Joaquin
• Circular Letter 2015-15 - Comment Period on EPA Draft Technologies for Legionella Control

• Circular Letter 2014-01 - Revised Public Water System Screening Form.
• Circular Letter 2014-02 - Use of American Steel Requirements
• Circular Letter 2014-03 - Revisions to the Drinking Water State Revolving Fund's Project Priority Lists
• Circular Letter 2014-04 - Free Water Sector Emergency Response Training Opportunities   
• Circular Letter 2014-05 - Request for Existing Service Areas
• Circular Letter 2014-06 - Community Development Block Grant – Superstorm Sandy Disaster Relief Funds
• Circular Letter 2014-07 - Reporting and Notification of the UCMR3 results for public water systems serving less than 1000 persons.
• Circular Letter 2014-08 - Reporting and Notification of the UCMR3 results for public water systems serving 1000 or more persons.
• Circular Letter 2014-09 - Proposed Regulation Amendments to Conform to the Revised Total Coliform Rule- Invite to Informational Meeting and Presentation
• Circular Letter 2014-10 - Revisions to the Project Priority Lists for State Fiscal Years 2014 and 2015
• Circular Letter 2014-11 - Public Water System Improvement Plan
• Circular Letter 2014-12 - Update Evaluation of Source Water Protection Measures
• Circular Letter 2014-13 - Second Tranche Funding Applications - Superstorm Sandy Disaster Relief for Public Water Systems
• Circular Letter 2014-14 - Review Stages of Response and Trigger Levels; Reservoir Capacity Reporting
• Circular Letter 2014-15 - Free Emergency Response/CtWARN Training Opportunity for CPWS 
• Circular Letter 2014-16 - Final Altered Boundaries of the Public Water Supply Management Areas and Priorities for Initiation of the Water Utility Coordinating Committee Planning Process  

• Circular Letter DWS 2013-01 - Consumer Confidence Report (CCR) Rule Electronic Delivery option.
• Circular Letter DWS 2013-02 - Off-Hours Reporting and Notification to the Department of Public Health
• Circular Letter DWS 2013-03 - Annual Water Company Reporting Requirements and Public Water System Contact Requirement  
• Circular Letter DWS 2013-04 - Revisions to the Total Coliform Rule
• Circular Letter DWS 2013-05 - Reduction of Lead in Drinking Water Act
• Circular Letter DWS 2013-06- Connecticut General Statute (CGS) 25-33q - High Quality Source (HQS) List

2012

• Circular Letter DWS 2012-02 - Review Stages of Response and Trigger Levels

2011

• Circular Letter DWS 2011-01 - Water Operator Certification Fees
• Circular Letter DWS 2011-02 - Drinking Water State Revolving Fund Changes for 2011
• Circular Letter DWS 2011-03 - Hurricane Irene – Water Advisory
• Circular letter Fluoridation – HHS/CDC announcement and CT Laws for adjusted water fluoridation