WRWA OTM/NN Compliance Sampling 2025 Multiple Dates & Locations in 2025 (6 OTM/NN Credits) Doors will open at 7:30 am with the class starting PROMPTLY at 8:00 am. The class will end at 3:00 pm. May 21, 2025 – Hilbert Community Center, 45 N. 5th St, Hilbert, WI 54129 June 10, 2025 – Lake Hallie ... WRWA OTM/NN Compliance Sampling 2025 (6 OTM/NN Credits)