Baltimore City Department of Public Works (DPW) works with PromisePay to offer payment plans for residential water bill balances between $250-$5000. These are interest free payment plans that give you more time and flexibility to pay your bill. To see if you are eligible, click here and enter the required information. If you have more questions, call PromisePay at 410-779-9808 or email them at support@promise-pay.com.