RCW 86.09.154: Sale, lease, use of water by district.

Duly created flood control districts, when maintaining and operating flood control works, shall have authority incidental thereto to lease, acquire, construct, operate and maintain appropriate instrumentalities for the use and sale or lease of water for any and all beneficial purposes and for the drainage, diking, or irrigation of lands upon the payment to the district of the reasonable cost of such service on a semiannual or monthly toll basis.