Water Supplier Operations

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Rules and Guidance

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• 310 CMR 22: The Massachusetts Drinking Water Regulations 
• Guidelines for Public Water Systems 
• Drinking Water Policies and Guidance 
• Drinking Water Standards and Guidelines 
• Communications to Public Water Suppliers 
• Operator Safety 
• Drinking Water Information for Building Inspectors 
• Development of a PFAS Drinking Water Standard 
• Capacity Development 

Emergencies & Preparedness

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• Storm Preparedness & Emergency Response Resources 
• Climate Preparedness for Water Resources 
• Cybersecurity Advisory for Public Water Suppliers 
• Issuing & Lifting Drinking Water Public Health Orders 
• Public Notification & Emergency Contacts List 

Reporting & Public Notification

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Reporting to water supply customers

• Consumer Confidence Reports 
• Fact Sheet: Drinking Water Public Notification 
• FAQs: Drinking Water Public Notification 
• Open XLSX file, 448.04 KB,  PWS, Active Sources, and Contacts Spreadsheet (Rev. July 2025) (English, XLSX 448.04 KB)

Contaminants

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• Drinking Water Contaminants Information for Water Suppliers 
• PFAS Information 
• Legionella 
• Revised Total Coliform Rule (RTCR)  

Training

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• Very small system operator 
• MassDEP YouTube training channel 
• Access the training calendar 
• See all training