The Massachusetts Water Pollution Abatement Trust (MWPAT or the "Trust") was established in 1989 pursuant to Title VI of the Federal Clean Water Act. It was later amended in 1998 to encompass the provisions of Title XIV of the Federal Safe Drinking Water Act.

The Massachusetts Water Pollution Abatement Trust improves the water quality in the Commonwealth through the provision of low cost capital financing to cities, towns, and other eligible entities, and maintains stewardship of public funds with prudence, professionalism, and integrity.

The Trust administers loan programs that provide funding to cities, towns, other governmental units, and private entities for the purpose of financing improvements to drinking water and wastewater infrastructure. To qualify for a loan, the project must be approved by the Department of Environmental Protection (DEP).