ALABAMA: AQUADOME RECREATION CENTER
The Aquadome Recreation Center has a heated, indoor pool underneath a circular glass dome. Public swim times, swimming lessons, and aquatic exercise classes offer some activity for everyone. The lap-swim program is $200 a year or $50 quarterly ($100 a year or $25 quarterly for 62 and older).
ALASKA: KETCHIKAN GATEWAY AQUATIC CENTER
The Ketchikan Gateway Aquatic Center, maintained by the city's parks and recreation department, features a large competition pool and a recreational pool that caters to kids. Twisty and tube slides, fountains, dump buckets, and spray faucets add some fun. Open swim is $3 (free for children under 2), and the recreation center offers swim gear rentals for $1 to $3.
ARIZONA: KIWANIS RECREATION CENTER
Tempe's Kiwanis Recreation Center features an indoor, warm-water wave pool. The 3-foot waves come in eight patterns, and the pool offers tube and raft rentals. Visitors can also try a 122-foot, double-spiral waterslide and enjoy lap swimming, open swim, or water fitness. Admission fees are $7 or less.
ARKANSAS: QUAPAW BATHS AND SPA
The swimming waters in Quapaw Baths and Spa, part of Hot Springs National Park, have been carbon-dated to 4,000 years old. Quapaw has four thermal pools with stained glass ceilings that are reserved for guests 14 and older. Entry to the pools is $20.
CALIFORNIA: WESTWOOD POOL
Serving West Los Angeles, the Westwood Pool offers an impressive array of classes and team athletics, including water polo, novice swim team, synchronized swimming, Special Olympic swim team, springboard diving, and adult lap swimming. Regular admission is $3.50 for adults and $1 for children and seniors.
COLORADO: APEX CENTER
Just outside Denver, the Apex Center has large waterslides and a vortex pool with a moving current. Most popular with kids, though, is probably a zero-depth play area with fountains, slides, geysers, and waterfalls. An adjoining indoor pool hosts lap swimming, lessons, and classes. Fees range from $4.75 to $8.75 (cheaper for residents; kids 1 and under are free).
CONNECTICUT: DERBY VETERANS COMMUNITY CENTER
In New Haven County, the Derby Veterans Community Center offers annual membership rates (with discounts for veterans and their families), but daily fees are $3 or $4. The pool has a fun, underwater-themed mural. Private swim lessons ($20 a session) are also available.
DELAWARE: WESTERN FAMILY YMCA
Head to the Western Family YMCA to hit the pool. While membership to the Y is required, financial aid is available to those who need it and free guest passes are available online (limit one per person per year). Fees are also lower for those who sign up for specific programs. There's even a waiting list for kids to get free swim lessons, as the Y has a goal of making all children in the state "water wise."
FLORIDA: DAYTONA STATE COLLEGE AQUATIC CENTER
The Daytona State College Aquatic Center opens its large, competitive swimming pool to the community for $5 a day (kids 3 and under are free). In addition to recreational play and lap swimming, it offers swim lessons (and sometimes scuba lessons). The facility is accessible for people with disabilities.
GEORGIA: SOUTH COBB AQUATIC CENTER
For less than $5 daily, the South Cobb Aquatic Center is a fun and inexpensive water park alternative. With a shallow playground and a deeper area with giant twisty slides, this pool also has space for recreational and lap swimming. Water aerobics classes are $4.50 for adults and $2 for seniors.
HAWAII: KAWAMOTO SWIM STADIUM
Fitness enthusiasts can visit Kawamoto Swim Stadium in Hilo to enjoy a rare covered pool that still gets island breezes. The public can use this pool for free when it’s not in use by local swim clubs or schools.
IDAHO: SILVER RAPIDS INDOOR WATERPARK
The Silver Rapids Indoor Waterpark, part of the Silver Mountain Resort, is the largest in the state, with features including a lazy river and Hoop Lagoon for basketball. Entrance is free for those staying at the attached lodge, but non-guests with a group of 15 or more can enter the attraction for about $35 a person (kids under 3 are free).
ILLINOIS: COMMUNITY RECREATION CENTER WATER WORKS
The Community Recreation Center boasts an all-ages water park. The Water Works features a water playground, a pool with beach-like entry for little kids, three waterslides, a whirlpool, a rapid water channel, and more. Entry is $6 to $10.
INDIANA: KRANNERT FAMILY CENTER
Formerly known as the Krannert YMCA, the Krannert Family Center offers aqua aerobics, aqua Zumba, and swimming for the whole family. The fee for adults is $3 a day and kids 2 and under are free.
IOWA: GRAND HARBOR RESORT
Get soaked at the Grand Harbor Resort to enjoy a 25,000-foot indoor water park. Kids can play with squirt guns, waterslides, and spouts, and a four-story water "dump" from a Huck Finn treehouse. Guests can also enjoy a lazy river, relaxing pools, activity pools, and hot tubs starting at $10 for children and $12 for adults, or $5 for spectators.
KANSAS: LAWRENCE PARKS AND RECREATION INDOOR AQUATIC CENTER
The Lawrence Parks and Recreation Indoor Aquatic Center has a competitive swimming pool with 10 lanes and a diving well and a separate (warmer) family pool with a slide, interactive water playground, and zero-depth entry. Daily passes are $4 or $5; free for children 2 and under.
KENTUCKY: MARY T. MEAGHER AQUATIC CENTER
For a daily fee of $3 to $6, the Mary T. Meagher Aquatic Center offers indoor lap swimming, recreational swimming, aquatic exercise, and swimming and lifeguard classes. Monthly and annual memberships are available too.
LOUISIANA: UNO LAKEFRONT ARENA AQUATIC CENTER
At the University of New Orleans, the public can pay $10 six days a week (the center is closed Sundays) to use the UNO Lakefront Arena Aquatic Center, which features a 50-meter indoor pool and an adjacent outdoor pool and deck. Both pools are heated, and lessons are available year-round.
MAINE: COLONIAL MAST CAMPGROUND
The Colonial Mast Campground has a rustic, wood-paneled indoor pool with entrance fees of $4 to $8. The pool is open year-round for open swim, parties, lessons, and water aerobics.
MARYLAND: GERMANTOWN INDOOR SWIM CENTER
The Germantown Indoor Swim Center measures about 60,000 square feet, including an indoor pool, diving area, and waterslide. It's fully accessible for people with disabilities. Day passes are $5 to $10, depending on age, residency, and day of the week.
MASSACHUSETTS: CAPE CODDER WATER PARK
The Cape Codder Water Park at the Cape Codder Resort and Spa is open to the public. A $30 to $40 day pass buys access to an 8,200-square-foot pool featuring 2-foot waves, a water-umbrella fountain, two waterslides (50 feet and 80 feet), and a 24-person whirlpool.
MICHIGAN: TROY COMMUNITY CENTER
The Troy Community Center combines an adults' section, including lap lanes and a therapy pool, and a kids' area with a twisting slide, lily pad leap, splash zone, and boat slide. Daily passes cost $6 to $11, depending on age and residency (children 2 and under are free). Classes in lifeguarding, swimming, and water aerobics run year-round.
MINNESOTA: EDINBOROUGH PARK
Edinborough Park has an 82-degree pool that everyone can use, but only swimmers over the age of 16 can engage in lap swimming. Entry to the pool (which also includes use of the surrounding track) is $11.50.
MISSISSIPPI: BILOXI NATATORIUM
The Biloxi Natatorium houses an Olympic-size indoor pool that's open year-round for adult lap swimming, all-ages recreational swimming, teams, lessons, and parties. Regular admittance costs $1 for those 17 and under and $3 for adults. A 15-visit pass (which lasts 90 days) is $30.
MISSOURI: CASTLE ROCK RESORT
The Castle Rock Resort offers public access to its 30,000-square-foot, indoor, climate-controlled water park at a day-pass rate of $15 a person (free for one child 2 or under). Families will enjoy corkscrew and tube slides, animal statues and fountains, dumping buckets, a lazy river, a lap pool, and more.
MONTANA: FAIRMONT HOT SPRINGS RESORT
The Fairmont Hot Springs Resort houses a hot pool (average temperatures of 100 to 104 degrees) as well as a regular pool indoors. Although the facility is open 24/7, lifeguards stay on duty 8 a.m. to 8:30 p.m. Guests of the resort get free access, and public entrance is $11.75 or less.
NEBRASKA: MONTCLAIR COMMUNITY CENTER
Montclair Community Center's indoor pool offers open swim, lap swimming, and a variety of classes for kids and adults. Day pass rates are $4 for adults and $3 for teens and kids, and guests can purchase a punch card or a season pass. Lifeguards are on duty during public swim times.
NEVADA: ALF SORENSEN COMMUNITY CENTER
The Alf Sorensen Community Center has a 25-yard heated pool for lap swimming and open swim, a diving well, and a tot pool. Certified lifeguards keep things safe, and the center requires that children under 7 pass a swim test to swim unsupervised. Drop-in fees are $5 to $8.
NEW HAMPSHIRE: PORTSMOUTH RECREATION DEPARTMENT
The Portsmouth Recreation Department maintains a 25-meter, year-round indoor pool with six lanes for dedicated swimmers and a diving board. Day entry is $3 to $5 for residents and $5 to $10 for nonresidents. Swimming, water aerobics, and Red Cross lessons are available.
NEW JERSEY: PERSHING FIELD POOL
Jersey City's half-Olympic size Pershing Field Pool has lanes for lap swimmers and an area for everyone else, draws good reviews for cleanliness, swim kit availability, and free parking, and costs only $2 to $4 for residents of the city and $4 to $8 for others.
NEW MEXICO: HIGHLAND POOL
Highland Pool is one of several public pools that's heated by solar power, and the prices can't be beat — entry fees for kids 5 and under are 50 cents, kids 6 to 12 are $1.75, and adults are $2.50. There are also discounts for military and seniors.
NEW YORK: LOVEJOY PUBLIC POOL
In Buffalo, the outdoor pools are free in summer, but those looking to take a dip indoors shouldn't mind the prices. Lovejoy Public Pool is $3 for nonresidents, $2 for residents, and $1 for kids and seniors from Labor Day to June 30, and $2.50 for everyone July 1 to Aug. 31.
NORTH CAROLINA: BUFFALOE ROAD AQUATIC CENTER
Buffaloe Road Aquatic Center features not only the standard lap swims and recreational open swims at its indoor pool but also a three-story waterslide, lazy river, and water vortex. Visitors pay $4 to $15, depending on age and residency.
NORTH DAKOTA: WILLISTON AREA RECREATION CENTER
The Williston Area Recreation Center on the campus of Williston State College opened in 2014, and the new facility has a water park, an indoor turf field, and a golf simulator. The indoor pool is just as much of a draw, and entry is $3 for kids 7 and under and $8 for adults.
OHIO: COLUMBUS AQUATICS CENTER
The indoor pools at the Columbus Aquatics Center charge just $1 for admission, although there are a few requirements. Everyone 6 and older needs a Leisure Card ($1 for the year with proof of identity) and admission must be paid in quarters. Once inside, swimmers can enjoy a small, shallow pool or a competition-size pool with a diving board.
OKLAHOMA: WATER ZOO
The Water Zoo in Clinton is 28,000 square feet — all indoors, and kept at a constant 83 degrees, year-round — with 500 feet of slides (long enough that an enclosed tube leaves and returns to the main Zoo structure) and plenty of other water features to keep everyone busy no matter what their speed. Admission is $26 for those 4 feet and under, $38 for taller people and free for children 3 and under.
OREGON: OREGON CITY SWIMMING POOL
Oregon City's swimming pool is 25 meters long, with six swim lanes, and a lifeguard is always on duty. The pool also has a waterslide, diving board, and water basketball area. Guests can drop in for $3.50 to $5 a person, depending on residency and age. Parents bringing kids can save with family rates: $6.75 for residents and $9 for nonresidents.
Split Rock Resort in the Poconos has an adjacent indoor water park called H2Oooohh, which spans more than 53,000 square feet. The park has tube, raft, and body slides, as well as a play structure and hot tubs. Day passes cost $20 to $25 after 4 p.m. and $33 to $38 otherwise, but discounts are available for multi-day passes, seniors, hotel guests, and observers.
RHODE ISLAND: NORTH PROVIDENCE POOL AND FITNESS CENTER
At the North Providence Pool and Fitness Center, day passes are $7 for adults and $5 for children to enjoy a large, indoor pool that's open year-round. The shallow end is accessible for people with disabilities. A tropical mural adorns the wall beside the hot tub, which holds 12 adults (no kids allowed).
SOUTH CAROLINA: W.L. STEPHENS AQUATIC CENTER
The W.L. Stephens Aquatic Center offers an array of swim classes, lifeguard courses, and even "SwimCalm," a program to help adults who fear the water learn to swim. Day passes for residents are $1.50 for kids and $2 for adults, while nonresidents pay twice that.
SOUTH DAKOTA: MIDCO AQUATIC CENTER
The Midco Aquatic Center is $6 for adults and $5 for kids, and families will be thrilled that this new facility offers some of the perks of an expensive water park. The recreation pool has a dumping bucket, slides, water sprays, and a lily pad water crossing.
TENNESSEE: KINGSPORT AQUATIC CENTER
The Kingsport Aquatic Center hosts year-round swimming and water play at its three indoor pools, one of which is Olympic-size. Guests can swim laps, engage in recreational swim time, or take water therapy classes. Day passes cost $6 for youth and seniors and $8 for adults.
TEXAS: BACHMAN INDOOR POOL
Visitors to the Bachman Indoor Pool can enjoy a hot jet spa in addition to the large swimming pool, which has an underwater entrance ramp to accommodate people with disabilities. The facility uses UV sanitation to purify the water. The drop-in fee is $3 a day with a City of Dallas recreation card ($5 to $15 for residents; free for children 5 and under).
UTAH: PROVO RECREATION CENTER
The Provo Recreation Center is $5 a day for adults and $4 for kids, and the whole family will find something to do even if they don't want to swim laps. There's an aquatic climbing wall plus a leisure pool with a lazy river and treehouse.
VERMONT: THE SWIMMING HOLE
The Swimming Hole is a nonprofit community swimming and fitness center. Housed inside a quaint, red barn, the center features an Olympic-size lap pool with a diving board, as well as a smaller pool for kids with a small slide. Non-member day fees are $6 to $20, which includes access to all fitness areas.
VIRGINIA: SOUTHSIDE AQUATICS CENTER
The city of Norfolk has outfitted its Southside Aquatics Center with an accessible pool that has two diving boards. The pool also features a two-story twisty slide and a zero-depth recreation center for the youngest visitors. Annual fees for residents are $20 for youth and $50 for adults.
WASHINGTON: MOUNTLAKE TERRACE CITY POOL
Located outside Seattle, the Mountlake Terrace city pool has a shallow leisure pool with a beach-like entry and padded floor adjacent to the regular pool, plus basketball hoops and jet sprays, a lazy river, and a designated toddler area. The warm-water pool is accessible for people with disabilities. Floaties and life jackets, as well as water toys, are provided.
WEST VIRGINIA: YMCA
The YMCA in Wheeling has a competition-size pool that caters to kids and adults with swimming lessons and free swim time year-round. There's also a hot tub, so adults can relax while swim-capable kids play under the watch of certified lifeguards. A day pass costs $10 a person (with no membership), while kids 5 and under swim free.
WISCONSIN: NOYES POOL AND PULASKI POOL
Milwaukee has two impressive indoor pools with cheap admission prices. Both the Noyes Pool and the Pulaski Pool charge $3 to $4 for open or lap swim. They also have aqua Zumba and water exercise classes for $4 (ages 12 and up). The pools are competition-size and have two diving boards each.
WYOMING: HOT SPRINGS STATE PARK AND STAR PLUNGE
Thermopolis is home to Hot Springs State Park, where the mineral water is geothermally heated and supposedly has therapeutic properties. Indoor soaking pools, free of charge for park guests, are open year-round. There's also the Star Plunge recreation center, with an indoor slide and warm-water pool (admission $6 to $12.50).