NR 812.31(4)(d) (d) The portion of the well casing pipe above a short length pitless unit shall be steel or thermoplastic well casing pipe meeting the requirements specified in s. NR 812.11.

NR 812.31(4)(e) (e) When thermoplastic well casing pipe is extended above the ground surface, the thermoplastic pipe shall be of the type with inhibitors recommended for use in direct sunlight or shall be contained in a pumphouse or in an oversized steel pipe extending from below the frost depth to the top of the thermoplastic pipe.

NR 812.31(4)(f) (f) A permanent tag bearing the message “plastic well casing pipe” shall be attached to the top of the well.

NR 812.31(5) (5) Pitless receiver tanks. Pitless receiver units shall be approved for use under s. NR 812.091.

NR 812.31(5)(a) (a) Steel buried tanks that are part of a pitless unit shall have a minimum wall thickness of 1/4-inch and shall have an identifying seal, label, or plate showing the manufacturer’s name and model number.

NR 812.31(5)(b) (b) An approval under s. NR 812.09 shall be obtained for the installation of a buried pitless receiver tank having a gross volume greater than 1,000 gallons.

NR 812.31 History History: Cr. Register, January, 1991, No. 421, eff. 2-1-91; am. (intro.), (1), (2) (a), (b) and (d), (3) (a) 3., (5) (a) and Figure 28, cr. (5) (intro.), Register, September, 1994, No. 465, eff. 10-1-94; CR 13-099: am. (2), (4) (e) Register September 2014 No. 705, eff. 10-1-14; CR 18-095: am. (2) (a), (c), (3) (a) (intro.), 3., (b) (intro.), (4) (a), (d), (e), (5) Register June 2020 No. 774, eff. 7-1-20; correction in (1) made under s. 35.17, Stats., Register June 2020 No. 774; CR 21-070: am. (2) (a) Register July 2022 No. 799, eff. 8-1-22.

NR 812.32 NR 812.32 Pumps.

NR 812.32(1) (1) General pump installation requirements.

NR 812.32(1)(a) (a) Pump installations shall be carried out so the pump installation will be:

NR 812.32(1)(a)1. 1. Installed so it and its surroundings are in a sanitary condition.

NR 812.32(1)(a)2. 2. Properly sized to provide the volume of water necessary, where obtainable, for an adequate water supply.

NR 812.32(1)(a)3. 3. Designed to meet the well characteristics and not exceed the yield of the well except when the available aquifer is low producing.

NR 812.32(1)(a)4. 4. Installed for operation without priming or breaking suction.

NR 812.32(1)(a)5. 5. Installed in such manner as to provide adequate protection against contamination of the water supply from any surface or subsurface sources.

NR 812.32(1)(a)6. 6. Installed in a manner so that it is accessible for maintenance, repair and removal.

NR 812.32(1)(b) (b) Pump motor lubricant or coolant oil shall be USDA or FDA approved food contact grade formulations.

NR 812.32 Note Note: Such formulations are usually based on National Formulary, white food grade mineral oil or inhibited propylene glycol with FDA approved components.

NR 812.32(1)(c) (c) Every pump shall be installed with an above-ground discharge, an approved subsurface pitless adapter or pitless unit, or an approved subsurface well casing pipe connection.

NR 812.32(1)(d) (d) When water is pumped or flows to discharge into a body of water, the end of the discharge pipe shall be extended at least 2 pipe diameters above the highest elevation of the water.

NR 812.32(1)(e) (e) All well pump electrical installations shall conform to the Wisconsin Electrical Code, incorporated by reference in the Wisconsin Electrical Code, ch. SPS 316, and the requirements specified in that chapter. In addition to these requirements, no electrical control box or any other electrical device shall be installed inside a well casing pipe, except where the device is directly incorporated into the manufactured pump assembly.

NR 812.32(1)(f) (f) For water systems with multiple wells interconnected to a common plumbing piping system, the department may require additional equipment to reduce the possibility of back-flow or back-siphonage between wells. This equipment may include a separate pressure tank for each well, additional check valves, air gaps, reduced pressure principle backflow preventers, pressure switches, and electronic pump control devices.

NR 812.32(2) (2) Off-set pump installations.

NR 812.32(2)(a) (a) Buried suction pipes.

NR 812.32(2)(a)1. 1. Buried suction pipes shall be enclosed in a pressurized conduit and the annular space between the 2 pipes shall be maintained under system water pressure at all times provided by a pipe extending from the pump watertight to the conduit.

NR 812.32 Note Note: In areas especially prone to lightning strikes to wells having submersible pumps, the department will grant variances to the prohibition against nonpressurized conduits.

NR 812.32(2)(a)2. 2. When a suction pipe crosses a sewer, the suction pipe shall be laid according to the sewer separation requirements of s. NR 812.32 (4).

NR 812.32 Note Note: A well casing pipe nipple, 1/2 threaded-1/2 beveled may be used in lieu of a full pipe coupling.

NR 812.32(2)(a)3. 3. Pressurized conduits may terminate at the end of a horizontal pipe entering a basement. Any unburied pump suction pipe in the basement not enclosed in a pressurized conduit shall be at least one foot above the basement floor. A pressure or box elbow may be used to extend the pressurized conduit to a point above the basement floor. Pressure or box elbows may be buried.