Drinking Water Contaminants Information for Water Suppliers

This MassDEP guide to cyanobacteria includes general information about: what they are, the potential health risks, and where to get more information. It also includes fact sheets and resources for Public Water Suppliers.

Q&A from the May 23, 2024 webinar/training "Community Fluoridation for Public Water Systems"

Questionnaire conducted approximately every five years to determine the extent of the use of mercury-containing products at public water systems.

Background materials for Conservation Law Foundation/Toxics Action Center petition to regulate PFAS, and MassDEP's response to the petition.

What are PFAS, why are they a concern, and what MassDEP is doing about them.

This fact sheet provides answers to questions frequently asked by public water suppliers about Per- and Polyfluoroalkyl Substances (PFAS) on evaluating whether Public Water Supply (PWS) sources contain PFAS and on what a PWS should do if PFAS are detected in a public drinking water supply.

MassDEP in partnership with the Massachusetts Department of Fire Services (MassDFS) has a take-back program to assist fire departments in the proper disposal of legacy firefighting foams that could impact water resources.

Basic information about PFAS and what actions EPA is taking

This report summarizes MassDEP's surface water quality sampling effort after mosquito control aerial spray events in August and September, 2019. The effort was conducted in response to MDPH's issuance of a "Certification of Public Health Hazard that requires Pesticide Application to Protect Public Health."

This report summarizes MassDEP's surface water quality sampling effort after mosquito control aerial spray events in August, 2020. The effort was conducted in response to MDPH's issuance of a "Certification of Public Health Hazard that requires Pesticide Application to Protect Public Health."

Updated January, 28 2022.