Mayor Vincent C. Gray

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About OCTO


Maps & Apps

Agency Support


Office of the Chief Technology Officer

Office Hours
Monday through Friday, 8:30 am - 5:30 pm

How to Reach Us
200 I Street, SE
5th Floor
Washington, DC 20003

Phone: (202) 727-2277
Fax: (202) 727-6857
TTY: 711

FOIA Information
Agency Performance


DC Digital Inclusion 

Rob Mancini
Chief Technology Officer

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Watershed Finder 

DC Water operates a wastewater collection system comprised of "separate" and "combined" sewers. Since the early 1900's, sewers constructed within the District have been separate systems and no new combined sewer system (CSS) have been built.

Separate systems are comprised of two independent piping systems: one system for "sanitary" sewage (i.e. sewage from homes and businesses) and one system for storm water. In the District, approximately two thirds of the District is served by a municipal separate storm sewer system (MS4). The remaining one-third is served by a CSS. The CSS is outside the legal jurisdiction of the Storm Water Administration.

The MS4 system discharges into portions of the Potomac, Anacostia and Rock Creek watersheds.

To learn what watershed you live and weather you live in the CSO or MS4 area, visit the Watershed Map.

Watershed Finder

Service Need

Residents can find and map the watershed and sewer system area for a given address.

Service at a Glance

Provided By: DDOE
Phone: (202) 535-2600
Days: Monday - Friday
Time: 9:00 am - 5:00 pm
Location: Your Home Washington, DC 23456

Request this Service

Water in the District of Columbia