Wisconsin Administrative Code
Department of Natural Resources
NR 800 - Environmental Protection - Water Supply
Chapter NR 809 - Safe Drinking Water
Subchapter I - Maximum Contaminant Levels, Monitoring and Analytical Requirements for Primary Drinking Water Contaminants
Section NR 809.329 - Reporting and recordkeeping requirements for groundwater systems

(a) A water supplier for a groundwater system conducting compliance monitoring under s. NR 809.327(3) shall notify the department any time the public water system fails to meet any department-specified requirements including, but not limited to, minimum residual disinfectant concentration, membrane operating criteria or membrane integrity, and alternative treatment operating criteria, if the operation is not restored in accordance with the criteria or requirements within four hours. The water supplier shall notify the department as soon as possible, but in no case later than the end of the next business day after the failure.

(b) After completing any corrective action under s. NR 809.327(2), a water supplier shall notify the department within 30 days of completion of the corrective action.

(a) Documentation of corrective actions. Documentation shall be kept for a period of not less than ten years.

(b) Documentation of notice to the public as required under s. NR 809.80. Documentation shall be kept for a period of not less than three years.

(c) Records of decisions under s. NR 809.325(4) and records of invalidation of an E. coli-positive groundwater source sample under s. NR 809.323(2). Documentation shall be kept for a period of not less than five years.

(d) For consecutive systems, documentation of notification to its wholesale systems of total-coliform positive samples that are not invalidated under s. NR 809.31(3). Documentation shall be kept for a period of not less than five years.

(e) For public water systems, including wholesale systems, which are required to perform compliance monitoring under s. NR 809.327(4) all of the following apply: