Section NR 811.26 - Number of pumping unitsAll pumping stations for systems using either groundwater or surface water shall meet the following requirements:
(1) There shall be 2 or more pumping units, with each unit capable of supplying the peak demand. The department may approve exceptions under sub. (2), if additional pumping stations which can meet the peak demand are available or if the department determines that there will be a sufficient volume of storage available between pumping periods to allow for necessary repairs. Depending on the type and size of the water system, a sufficient volume of storage may include elevated storage, ground storage fitted with high-lift pumps and auxiliary power, and pressure tank storage. If only 2 units are provided, each unit shall be capable of supplying the peak demand. If more than 2 units are installed, the total number of units shall have sufficient capacity so that if any one pump is taken out of service, the remaining pumps are capable of supplying the peak demand.(2) If no elevated storage is available and more than 50 living units are to be served, there shall be 2 or more wells or pumping units, each of which is capable of supplying the peak demand. An approved interconnection with another water system or a ground storage reservoir with high-lift pumps may be used in lieu of this requirement for other-than-municipal water systems.(3) Have controls for proper alternation when 2 or more pumps are installed.Wis. Admin. Code Department of Natural Resources NR 811.26
CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10.