Iriarai Nishi Park Water Play Area (water-recreation facility)

About this spot

The Iriarai Nishi Park Water Play Area is a free water play spot in Iriarai Nishi Park (入新井西公園) in Ota City. In 2026 it is scheduled to open from Fri, May 1 until around Wed, September 30, from 10:00 to 16:00; the closing date is not announced on the city official site, so late September is the usual guide. The facility has all three elements — a waterfall, a pond, and a stream — so its appeal is that you can change how you play within one place: reaching out toward the falling water, wading through the shallow stream, or crouching down to play in the pond. The water is filtered and disinfected, but it is not drinkable. It sits in a townscape within walking distance of JR Omori Station, and being reachable by train alone is another convenience. Admission is free, and it has become a playground that local families use as part of everyday life.

Season & hours

Tips

It is closed on the regular cleaning days of August 10 and August 25. The closing date is not announced by the ward, so if you are visiting in September, check the opening status on the Ota City official page before you set out. The water is not drinkable, so be sure to bring your own drinks. In May and June the water is still cold even when the air warms up, so having something to slip on right after getting out is reassuring. Changing space is limited, so wearing swimwear underneath shortens the preparation.

Best time to visit

Arrive at 13:40 and you can play for a full two hours or more until the 16:00 closing

Access & map

大田区・入新井西公園