CAPITOL EAST NATATORIUM -- Open seven days a week. Monday-Friday 7-9 a.m., 12-2 p.m., 3-5, 6-7 (adults only, Tuesday and Friday nights, 7-9), Saturday 1 to 5 (closed this Saturday for meet), Sunday 11 to 5. Free swimming for ages three and up. Classes in scuba diving, kayaking, life saving, CPR, first-aid and for the handicapped. Community room with seating for 100 at 635 North Carolina Ave. SE. Call 724-4495.

D.C. THERAPEUTIC CENTER -- Monday-Thursday, 8-8; Friday 8-5; Saturday, 10-3; closed Sunday. Specializes in classes for handicapped. Call 767-7464.

DUNBAR HIGH -- Monday-Friday, 6-9 p.m.; closed Saturday-Sunday; at First & O Streets NW. Call 673-7744.

FORT LINCOLN -- Monday, Wednesday and Friday, 5-7; Monday and Wednesday, 7-8 p.m. (adults only); Friday, 7-8 (family & adults); Tuesday and Thursday, 5-6 and 7-8, adult lessons; 6-7, children; 31st and Fort Lincoln Drive NE. Call 576-6900.

MAMIE D. LEE -- Monday and Wednesday, 4-8 at Fort Totten Drive and Gallatin Street NE. Call 576-6386.

MARIE REED LEARNING CENTER -- Monday-Friday, 4-9. Closed Saturday-Sunday, 2200 Champlain St. NW. Call 673-7771.

SHARPE-HEALTH -- Tuesday and Thursday, 4-8, for handicapped, 13th and Upshur Streets NW. Call 576-6394.

SHAW JR. HIGH -- Monday-Friday, 6-9 p.m., closed Saturday-Sunday, 10th & R Streets NW. Call 673-7720.

WASHINGTON HIGHLAND -- Monday, Wednesday and Friday, 3:30-10 p.m.; Saturday 10-2 p.m. at 8th & Yuma Streets SE. Call 767-7449.

WILSON SR. HIGH -- Monday-Friday, 5:30-6:30 p.m. (all ages); Monday and Wednesday, 8-9 p.m. (adults only); Tuesday and Thursday, 6:30-7:30 (adults); 7:30-9 (all ages); Friday, 6:30-7 (family); Saturday, 10-noon (laps only); noon to 4, open swim; at Nebraska Avenue & Chesapeake Street NW. Call 282-2216.

WOODSON SR. HIGH -- Monday-Friday, 3-10 p.m.; Saturday-Sunday closed, 55th & Eads Street NE. Call 724-4499. CLUBS

Nearly all area health clubs require a six- or twelve-month membership to swim. Here are a couple that don't:

SKYLINE RACQUET & HEALTH CLUB -- Daily fee of $16 includes pool and all club facilities except racquetball and tennis. Monday-Friday, 7 a.m.-10 p.m.; Saturday 7-7; Sunday 7 a.m.-9 p.m. Now registering for development and age-group teams, ages 6-18. Practices Tuesday-Thursday, 4-6; masters team practices Monday and Wednesday evenings and Saturday mornings at 5115 Leesburg Pike, Falls Church. Call 820-4100.

WATERGATE HEALTH CLUB -- $14 per day includes use of pool, spa, steam, sauna, weight and exercise rooms, hot tubs, two-hour parking, coffee, tea, laundry, sleeping lounge. Monday-Friday 8 a.m.-10 p.m.; Saturday-Sunday 10-6 at 2650 Virginia Ave. NW. Call 298-4460. AROUND-TOWN SWIMMING

POTOMAC VALLEY MASTERS -- For men and women 20 & older: Write PVMSC, 6151 Tompkins Drive, McLean, Va. 22101 or call 272-6156.

ALEXANDRIA YWCA -- Lesson sessions through April. Call 549-0850.

RECREATIONAL SWIMMING -- Seven days a week at the D.C. YWCA. Call 638-2100, ext. 44 for details.

ADULT LESSONS -- at all levels at National Capital YMCA. Call 862-9650.

EASTERN BOYS CLUB -- Offers adult lessons and parent/tots sessions at 17th Street and Massachusetts Avenue SE. Call 546-0949 to register.

ROCKVILLE CENTER -- Lessons for all ages and levels, including scuba. Outdoor pool opens mid-May. Call 424-3737.

ALLENTOWN ROAD AQUATIC CENTER -- Lessons for all ages. Call 449-5567.

BETHESDA-CHEVY CHASE YMCA -- Offers lessons for all ages and abilities. Call 530-3725.

FAIRFAX YWCA -- Offers classes for all ages, including pre-school. Call 560-1111.

MOUNT VERNON SPORTS COMPLEX -- Open Monday-Friday, 8 a.m.-10 p.m.; Saturday 9 a.m.-10 p.m.; Sunday noon-8 at 2017 Belle View Blvd. Avoid swim-team practice by calling 768-3223.

SILVER SPRING YWCA -- Has classes for all ages. Call 460-3900.

PROVIDENCE REC CENTER -- Open Monday-Friday, 8 a.m.-10 p.m.; Saturday 9 a.m.-10 p.m.; Sunday 9 a.m.-10 p.m. at 7825 Marc Drive, Falls Church. Call 698-1350.

ROBERT E. LEE REC CENTER -- Fairfax Masters team workouts Tuesday, Thursday and Sunday. Open to public Monday-Friday, 8 a.m.-10 p.m; Saturday 9 a.m.-10 p.m.; Sunday noon to 10 at 6601 Telegraph Road, Alexandria. Call 922-9840.

WAKEFIELD REC CENTER -- Fairfax Masters team seeks members, ages 20-90. Workouts Monday, Wednesday and Friday. Pool open 9 a.m. to 10 p.m. every day. 8100 Braddock Road, Annandale.Call 321-7080.

ALEXANDRIA REC -- Has swim tickets for pool at Ramada Inn (includes sauna & whirlpool). Call 838-4828.

MONTGOMERY REC -- Offers lessons at Colesville/White Oak & Piney Branch. Call 622-4190.

MONTGOMERY YWCA -- Has classes Fridays at 9:45 a.m. Call 460-3900.

SILVER SPRING YMCA -- Adult classes for all levels. Call 585-2120.

THERESA BANKS POOL -- In Glendarden, has classes for all levels, every day. Call 772-5516.

FAIRFAX COUNTY POOLS -- For information on pools and swimming in the county, call 941-5000.