The commission unanimously approved $750,000 Wednesday, adding to a previously-approved $700,000. The money will go toward a variety of upgrades needed at closed landfills in Hartford, Ellington, Waterbury, Wallingford, and Shelton. Included in the project is work at two homes near the Ellington landfill, where PFAS chemicals have leached into the drinking water. Work in Ellington also includes repairs to the methane collection system on the site and filtration at the nearby homes. Work is also being done to determine whether other homes in the area are also seeing PFAS contamination.