How do i contact dc water customer service? Main Office. 1385 Canal Street, SE. Washington, DC 20003. Phone. 202-787-2000 (M-F 8 a.m. to 5 p.m.) Fax. 202-787-2333. E-mail. [email protected]. Where can i make payments on my wasa account? Customers are reminded that payments can be made at any Commercial Bank, Sure-Pay, Western Union, VIA, WASA Services App (available in Play or Apple Stores), as well as online at: https://customerportal.wasa.gov.ttHow do i make a payment on my dc water? Register online and pay using your credit card, checking or savings account to make a one-time payment through My DC Water. You can also sign up for recurring payment options using a credit card or your checking or savings account.