Section NR 810.40 - Recordkeeping requirements(1) Public water systems shall keep results from the initial round of source water monitoring under s. NR 809.331(1) and the second round of source water monitoring under s. NR 809.331(2) until 3 years after bin classification under s. NR 810.34 for filtered systems or determination of the mean Cryptosporidium level under s. NR 810.35 for unfiltered GWUDI systems for the particular round of monitoring.(2) Public water systems shall keep any notification to the department that the systems will not conduct source water monitoring due to meeting the criteria of s. NR 809.331(4) for 3 years from the date of notification.(3) Public water systems shall keep the results of treatment monitoring associated with microbial toolbox options under ss. NR 810.42 to for 810.463 years from the date of monitoring.Wis. Admin. Code Department of Natural Resources § NR 810.40
CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10.