Question 1

How many public water systems are in District of Columbia?

Accepted Answer

District of Columbia has 14 active public water systems in EPA SDWIS records, including 4 community water systems. Together they report serving 696.5K people.

Question 2

What is the largest water system in District of Columbia?

Accepted Answer

D.C. Water and Sewer Authority is the largest active public water system in District of Columbia, serving a reported 632,323 people.

Question 3

Does District of Columbia rely more on groundwater or surface water?

Accepted Answer

57.1% of District of Columbia's active public water systems draw primarily on groundwater and 42.9% on surface water (including purchased supplies).

#	Water system	County	Population served	Type	Source
1	D.C. Water and Sewer Authority	District of Columbia	632,323	Community	Purchased surface water
2	National Airport	Arlington	28,055	Non-transient non-community	Purchased surface water
3	Joint Base Anacostia - Bolling	District of Columbia	19,312	Community	Purchased surface water
4	Naval Station Washington - Wny	District of Columbia	15,690	Community	Purchased surface water
5	Naval Observatory	District of Columbia	250	Non-transient non-community	Purchased surface water
6	Ymca Camp Letts	Anne Arundel	201	Transient non-community	Groundwater
7	Navcc-Library of Congress Packard Campus	Culpeper	200	Non-transient non-community	Groundwater
8	Raven Rock Mountain Complex	Adams	150	Non-transient non-community	Groundwater
9	Huspp 180 First Ave	Lackawanna	100	Non-transient non-community	Groundwater
10	Kent Island Shopping Center	Queen Anne's	88	Non-transient non-community	Groundwater
11	Jemals Bay 50 Plaza	Anne Arundel	50	Non-transient non-community	Groundwater
12	Ymca Camp Letts Well # 2	Anne Arundel	50	Transient non-community	Groundwater
13	Camp Brighton Woods (Girl Scouts Nation)	Montgomery	30	Transient non-community	Groundwater

District of Columbia public water systems

System types in District of Columbia

Largest water systems in District of Columbia

By county