Section NR 812.30 - Vermin-proof well caps and seals NR 812.30 Vermin-proof well caps and seals.
(1) REQUIREMENTS. A new well shall be sealed or covered with a weather- and vermin-proof compression type well cap or seal approved for use under s. NR 812.091 and installed on or in the top of the well casing pipe.(2) WELL SEAL TYPE. When a sanitary well seal is used to cover the upper well terminal, it shall have a one-piece top plate. A split top plate seal may not be installed unless it is enclosed in a substantial, permanent weather-proof shelter meeting the requirements of s. NR 812.40.(3) WELL VENT. A screened downward facing well vent or other vent may be provided for the well cap or seal for drilled wells. When the well is a flowing well and the well head must be maintained watertight or when there is concern for air entrained bacteria to enter the well through the vent, the vent opening may be plugged watertight with a threaded plug. Vent pipes extending above the well casing pipe shall terminate in a downward facing bend and shall be screened. Screens shall be made of material not easily corroded and shall be firmly seated in the vent opening. Vent openings incorporated as part of the underside of an approved well cap or seal are allowed. Note: The department recommends a vent be provided for the well cap or seal of a well that has significant water level drawdowns during normal pump operation. This recommendation does not apply to flowing wells.
(4) HOLD-DOWN DEVICE. Well caps or seals may not be used as a hold-down device to prevent submersible pump discharge piping from coming off a pitless adapter or unit. A locking clamp or other similar approved device may be used to hold the submersible pump discharge pipe in place.(5) CONDUIT FOR ELECTRICAL WIRING. Where electrical wiring emerges from an underground installation to supply well pump equipment it shall be protected from physical damage by installing conductors or cables within a nonmetallic or steel raceway. The raceway material shall be: Listed, Schedule 80 sunlight resistant Rigid Polyvinyl Chloride Conduit (Type PVC), Listed, Intermediate Metal Conduit (IMC), or galvanized Rigid Metal Conduit. The conduit shall be threaded tightly into the well cap or shall be secured and sealed in an equivalent manner. Where a direct buried electrical cable supplies the well, the bottom of the conduit providing physical protection shall extend a minimum of 2 feet below grade. The conduit shall be sealed above grade in a watertight manner with a listed fitting, or by use of 100% silicone, urethane, or Butyl caulking. Where the conduit or raceway extends continuously from the well to a building or pump equipment enclosure, both ends of the conduit or raceway shall be sealed in a watertight manner as described in this paragraph.(6) PREPARATION OF TOP OF THE WELL CASING PIPE. Any jagged edges or other significant irregularities in the top of the well casing pipe shall be removed by the well driller or the pump installer before the vermin-cap or seal is installed.Wis. Admin. Code Department of Natural Resources § NR 812.30
Cr. Register, January, 1991, No. 421, eff. 2-1-91; am. (1), (3) and (5), Register, September, 1994, No. 465, eff. 10-1-94; CR 13-099: am. (3), r. and recr. (5), cr. (6) Register September 2014 No. 705, eff. 10-1-14.Amended by, CR 18-095: am. (1) Register June 2020 No. 774, eff. 7-1-20; correction in (1) made under s. 35.17, Stats., Register June 2020 No. 774, eff. 7/1/2020