Patowmack Diver's Dive Club
- Social organization centered around diving, with information on membership, meeting schedule, events and contacts.
- http://www.dcdiver.com/

Scuba Professional Education, Dive School
- SPE offers PADI, NAUI, CMAS and YMCA dive training and SCUBA dive certification courses in the Washington, D.C. and Chevy Chase, Maryland area. 28 years experience. Group dive travel and course completion in Grand Cayman.
- http://www.scubaedu.com/