Boston isn't even IN Maryland, silly.
no, but you know how bostonians like to party.
and living here in the PacNW, charging for every month it rains is the same thing as a regular monthly bill.
Oh, we are still paying for the court-ordered cleanup of Boston Harbor. Our sewage bills are among the highest in the nation thanks to Mike Dukakis. Instead of accepting the federal government's offer to pick up 90% of the tab, he fought the order. The federal funds were gone by the time he lost, so we got to pay the entire bill.
The people of MD will have to pay for it one way or another. The "rain tax" sounds like a dubious plan based on the minimal facts given in the OP's link, but I'm prepared to believe that it might be better than raising sewer rates.