Section NR 812.41 - Disinfection, flushing and sampling(1) DISINFECTION. When a potable well is entered for the purpose of installing, replacing or repairing equipment located within the well, the well and discharge piping shall be thoroughly disinfected by the pump installer or by the person who installed the pump using sodium hypochlorite or calcium hypochlorite. Chlorine compounds having additives may not be used. (a) The disinfectant shall be dispersed throughout the entire water column and in the water system.(b) A chlorine solution with a minimum of 100 mg/l of chlorine shall be used to disinfect wells and water systems.(c) The disinfectant solution shall be prepared according to Table D and shall remain in the system at least 8 hours, except for emergency situations when water is needed without delay. A contact time of at least 30 minutes shall be provided for emergency situations.(2) FLUSHING. The pump installer or his or her agent shall thoroughly flush the system of chlorine after disinfecting and before the pump is placed in normal service.(3) WATER SAMPLE COLLECTION, ANALYSIS, AND REPORTING. The pump installer shall collect water samples, submit them to a certified laboratory for analysis, and provide the test results in compliance with s. NR 812.46.Wis. Admin. Code Department of Natural Resources § NR 812.41
Cr. Register, January, 1991, No. 421, eff. 2-1-91; am. (1) (intro.), (3) (a), (c), Register, September, 1994, No. 465, eff. 10-1-94; CR 13-099: r. and recr. (3), cr. (4) Register September 2014 No. 705, eff. 10-1-14.Amended by, CR 18-095: am. (1) (c), r. and recr. (3), r. (4) Register June 2020 No. 774, eff. 7/1/2020