East Middlesex Mosquito Control Project: Provides mosquito control services to participating communities.
Middlesex/Mass Beekeepers: Beekeepers helping beekeepers to deal with problems in an increasingly urban county; co-operative buying of glass, sugar and medications.
Reservoir List: Sign up for an email list discussing the reservoir on the border of Arlington and Lexington.
Sudbury Valley Trustees: Information about volunteer group committed to protecting wildlife habitat and ecological integrity of the Sudbury, Assabet, and Concord Rivers.