Ten towns and several kinds of water
Framingham and Marlborough are on MWRA water, which is soft. Wellesley and Needham blend MWRA water with their own wells, and Wellesley's tests hard. Sudbury, Wayland and Hopkinton are on local wells, and Natick and Holliston run their own water systems. Sudbury's hardness has tested as high as 194 parts per million. Hard water puts more sediment in a tank. What to do about it.
Each town page below has the housing, the water, the gas company and the rebate.
The number on this page rings a plumber based in Framingham.