Alpine Pool & Design CorporationThis luxury pool designer and builder comes highly recommended by both readers and landscape professionals. 7220 Poplar St., Annandale; 703-333-3000; alpinepool.com.
Crystal PoolsSince 1973, Duncan Mac-Keever’s family has designed and built custom spas, water features, and pools, including freeform and natural pools. 9 Kirkwall Ct., Rockville; 301-299-6414; crystalpools.com.
Town & Country PoolsDesigns and builds luxury custom pools. 7540 Fullerton Ct., Springfield; 703-451-6660; townandcountrypools.com.