Residential customers who are signed up for either the Tiered Assistance Program or Senior Citizen Discount Program will not be the recipients of enforcement measures or penalized for overdue bills until April 2022, the Philadelphia Water Department said. However, customers who are not enrolled in these financial assistance programs will begin to receive penalties for late bills starting May 1, according to the Philadelphia Water Department. Other enforcement measures, such as referrals to collection agencies, will take effect Aug. 2. Some non-residential accounts could face service shutoff enforcement measures starting this summer too, the Philadelphia Water Department said. Efforts to set up payment plans with those customers have already begun.