Cool Waters Aquatic Center
✓ Last confirmed for the 2026 season
Where: 2028 S. 124th St., West Allis, Wisconsin
When: Summer through early September; closed Mondays except Labor Day
Hours: typically daylight hours
Cost: $4.50-$11
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Milwaukee County's largest outdoor water park combines water slides with a zero-depth entry pool dotted with climbable logs and lily pads, giving splash-pad-aged kids plenty to do. Admission runs on a tiered pricing scale rather than the free entry of county spray grounds.