Chapter NR 811

NR 811.28(5)(a) (a) Valves. Pumps shall be adequately valved to permit satisfactory operation, maintenance and repair of the equipment. If foot valves are provided, they shall have a net valve area of at least 2.5 times the area of the suction pipe and shall be screened. Each pump shall have an automatically closing valve or check valve on the discharge side between the pump and shutoff valve. Devices such as motor controls, slow opening and closing check valves, or surge relief valves shall be installed where necessary to minimize pressure surges or water hammer.

NR 811.28(5)(b) (b) Piping. Piping shall be designed to minimize friction losses and shall be protected against pressure surges or water hammer. Piping shall be supported, restrained, and buttressed as necessary. Where applicable, each pump shall have an individual suction line or manifolded lines that ensure similar hydraulic and operation conditions. Discharge piping exposed in buildings shall be ductile iron, copper, steel, stainless steel, or galvanized pipe. For other-than-municipal water systems, piping downstream of the control valve is subject to requirements under ch. SPS 383. The use of minimum schedule 80 PVC pipe meeting the requirements of SPS Table 384.30-7 is acceptable when the water to be carried in the piping can be documented as being aggressive to metal pipe or when necessary to be compatible with water treatment equipment and processes provided that the piping is properly restrained. All piping shall be certified to ANSI/NSF standard 61 dated March 15, 2022, which is incorporated by reference.

NR 811.28 Note Note: A copy of ANSI/NSF standard 61 dated March 15, 2022 is available for inspection at the Legislative Reference Bureau and may be obtained for personal use from NSF International, https://www.nsf.org/.

NR 811.28(5)(c) (c) Gauges and meters. Each pump shall have a standard pressure gauge on its discharge line and have a compound pressure gauge on its suction line if suction pressures are expected to be encountered. Where suction or discharge headers are utilized, only one gauge is required on each header. In addition, the station shall have indicating, totalizing, and recording metering of the total water pumped.

NR 811.28 Note Note: Discharge pressure recording devices are recommended at the larger stations.

NR 811.28(5)(d) (d) Water seals. Water seals may not be supplied with water of a lesser sanitary quality than that of the water being pumped. Where pumps are sealed with potable water and are pumping water of lesser sanitary quality, the water supply to the seal shall:

NR 811.28(5)(d)1. 1. Be provided with a department of safety and professional services approved reduced principle backflow preventer or a break tank open to atmospheric pressure.

NR 811.28(5)(d)2. 2. Where a break tank is provided, have an air gap, at least 6 inches or 2 pipe diameters, whichever is greater, between the feeder line and the spill line of the tank.

NR 811.28(6) (6) Painting of piping. In order to facilitate identification of piping in waterworks, pumping stations, pumphouses and, water treatment plants, it is recommended that the following color schemes be utilized for purposes of standardization:

- See PDF for table

NR 811.28(6)(e) (e) For liquids or gases not listed above, a unique color scheme and labeling shall be used. In situations where 2 colors do not have sufficient contrast to easily differentiate between them, a 6 inch band of a contrasting color shall be painted on one pipe at approximately 30 inch intervals. The name of the liquid or gas should also be painted on the pipe. Arrows may be painted on the piping indicating the direction of flow.

NR 811.28 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10; correction in (5) (b), (d) 1. made under s. 13.92 (4) (b) 6., 7., Stats., Register December 2011 No. 672; CR 22-074: am. (5) (b) Register January 2024 No. 817, eff. 2-1-24.

subch. V of ch. NR 811 Subchapter V — Pumping Equipment and Appurtenances

NR 811.29 NR 811.29 Pumping capacity requirements. Figure No. 1 located in the Appendix shall be used for determining minimum pump capacities for domestic service only, unless specific information is submitted to the department for review and the department approves the alternate pump capacities. When using Figure No. 1, the number of homes may be reduced by one-third for apartment units, condominium units, and manufactured or mobile homes. As an alternative, for apartment units, condominium units, and manufactured or mobile homes, the minimum pump capacity may be reduced to 1 gallon per minute per living unit. The department may require the water system owner to perform more detailed engineering studies to determine pump capacities for multiple uses, including domestic, commercial, and industrial usage and fire protection.

NR 811.29 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10; CR 22-074: am. Register January 2024 No. 817, eff. 2-1-24.

NR 811.30 NR 811.30 General pump, motor and wiring installation requirements.

NR 811.30(1) (1) Installation location. All nonsubmersible pump motors and all electrical controls shall be located above grade and protected from flooding, except as allowed for below grade booster pumping stations in s. NR 811.80 (3).

NR 811.30(2) (2) Motor, wiring and electrical controls. All exposed wires shall be encased along their entire length and otherwise installed in a manner to prevent contamination of the water supply. All motors, wiring, and electrical controls shall be installed in conformance with all applicable state and local electrical code requirements.

NR 811.30 Note Note: It is recommended that all pumps and motors be assessed during design to ensure that they will be energy efficient throughout their operational range and over their usable service life. It is recommended that all pump motors be provided with a recording watt meter.

NR 811.30 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10.

NR 811.31 NR 811.31 Line-shaft vertical turbine pumps.

NR 811.31(1) (1) Pump bases. Line-shaft vertical turbine pump base installations shall meet the requirements of this subsection and as shown in Figure Nos. 2 and 3 in the Appendix:

NR 811.31(1)(a) (a) Line-shaft vertical turbine pumps shall be supported by a concrete pump base which is installed to a height at least 12 inches above the pump station floor.

NR 811.31(1)(b) (b) The protective grouted casing of wells shall extend a minimum of one inch above the concrete pump base. If there is also an inner ungrouted casing, the inner casing shall extend a minimum of one inch above the pump base and the protective grouted outer casing shall extend a minimum of 4 inches above the floor and shall be incorporated into the concrete pump base. For these installations, a steel ring shall be welded between the inner and protective casings.

NR 811.31(1)(c) (c) The metal surfaces between the pump head and base plate shall be machined or gasketed to provide a watertight seal. A gasket or sealant shall be provided between the base plate and the concrete pump foundation.

NR 811.31(1)(d) (d) For high-lift line-shaft vertical turbine pumps installed above a reservoir, a steel casing shall be installed within the concrete pump base from the reservoir roof to a height above the pump base to provide a one inch sanitary lip. The requirements of pars. (a) to (c) shall also be met if applicable.

NR 811.31(1m) (1m) Column pipes. Column pipes for lineshaft vertical turbine pumps located within the well casing shall be constructed of steel, stainless steel, or galvanized steel pipe.

NR 811.31(2) (2) Pump lubrication.

NR 811.31(2)(a) (a) Water lubricated pumps are required, except if oil lubricated pumps are necessary to provide positive lubrication. The oil used for pump lubrication shall be an NSF/ANSI Standard 61 approved mineral oil. Oil lubricated pumps may not be installed for wells in unconsolidated formations or for wells with shallow pump settings less than 250 feet.

NR 811.31(2)(b) (b) For water lubricated pumps with static water levels deeper than 50 feet, provision shall be made for prelubricating the column bearings prior to pump startup. All prelubrication water lines shall be equipped with metering and controls to monitor and limit the volume of prelubrication water. At systems where chemical addition is practiced, solenoid valve control of the prelubrication water line shall be provided. If auxiliary power is provided, additional valving of the prelubrication water line shall be provided. When pump backspin is allowed to occur after the motor shuts off, the design engineer for the water system owner shall determine the necessity for lubrication during this period and provide for lubrication if necessary.

NR 811.31 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10; CR 22-074: cr. (1m), am. (2) (b) Register January 2024 No. 817, eff. 2-1-24.

NR 811.32 NR 811.32 Submersible vertical turbine pumps.

NR 811.32(1) (1) Pump bases. If a submersible pump is used, the top of the well casing shall be effectively sealed against entrance of water under all conditions including vibration or movement of conductors or cables. Requirements for the installation of pitless units are provided in s. NR 811.35. Submersible pump installations shall meet the requirements of this subsection and as shown in Figure Nos. 4, 5, and 6 in the Appendix:

NR 811.32(1)(a) (a) Termination above grade. The protective casing shall terminate above grade a minimum of 12 inches above a concrete floor. Submersible pump discharge pipes shall be extended to terminate through the top of the well casing.

NR 811.32(1)(b) (b) Well seals. Well seals shall consist of a sanitary surface plate bolted down with a gasketed or machined seal to a flange welded to the well casing or alternatively, a department approved well seal with one-piece top plate. All openings in the well seal shall be sealed watertight with grommets or compression fittings to prevent the entrance of contaminants.

NR 811.32(1)(c) (c) Protective collars and pump bases.

NR 811.32(1)(c)1. 1. The protective casing shall terminate at least 12 inches above the floor and be surrounded by a pump base or a minimum 1.5-inch thick concrete collar. Either the pump base or the concrete collar shall be installed to a height at least 6 inches above the floor.

NR 811.32(1)(c)2. 2. If a pump base is installed, any other outer well casing shall be terminated a minimum of 4 inches above the finished floor and incorporated into the pump base.

NR 811.32(1)(c)3. 3. A short section of outer well casing may be installed around the protective casing and the annular space between the 2 casings filled with grout to meet the collar requirement of subd. 1.

NR 811.32(2) (2) Drop pipes. Vertical drop pipes for submersible pumps located within the well casing shall be constructed of steel, stainless steel, or galvanized steel pipe. The department shall be contacted to request approval for an alternate minimum 150 psi pressured rated plastic drop pipe material specification which shall be granted if its use can be justified due to a corrosive water condition. All vertical drop pipe material specifications shall meet or exceed the requirements of s. NR 812.28 and the Pipe and Tubing for Water Services and Private Water Mains table found in SPS Table 384.30-7.

NR 811.32 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10; correction in (2) made under s. 13.92 (4) (b) 7., Stats., Register December 2011 No. 672.

NR 811.33 NR 811.33 Motor protection. If backspin can be expected to occur, the motor shall be provided with a time delay or non-reverse ratchet to protect the motor in case the pump controls are energized before the pump stops backspinning.

NR 811.33 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10.

NR 811.34 NR 811.34 Pump variable output control devices. Installations where pumps and pump motors will be physically or electronically controlled by a variable output control device shall meet the following requirements:

NR 811.34(1) (1) Pumping capacity to meet peak demand. The gallon per minute discharge rates of the pump or pumps shall be capable of meeting the peak demand rate when there is no elevated storage and the pressure tank storage volume will be reduced due to the installation of the variable output control device or devices.

NR 811.34(2) (2) High pressure cut-out switch. A high pressure cut-out switch shall be installed on the pump discharge piping to stop the pump motor when a preset maximum discharge pressure is detected if the pump shut-off head at the maximum possible speed will exceed the safe working pressures of the piping and appurtenances.

NR 811.34(3) (3) Pressure relief valve. A pressure relief valve shall be installed on the pump discharge piping sized to allow adequate pressure to be relieved if a malfunction that would cause the pump to discharge at the maximum possible rate would result in pressures exceeding the safe working pressures of the piping and appurtenances.

NR 811.34(4) (4) Backup controls. All water systems supplied by one well or booster pump shall be provided with a redundant means of controlling the operation of the pump motor. Such means may include the installation of an electrical bypass of the variable output control device along with the installation of pressure switches or other department approved installation.

NR 811.34(5) (5) Flow pacing for chemical feed pumps. Where pump discharge rates will vary after initial startup of the pump, all chemical feed pumps shall be paced from a flow proportional signal from a water meter. This requirement is in addition to any requirement for the chemical feed pump to be wired to operate in series with the pump motor starter and any required secondary chemical feed pump control mechanism.

NR 811.34(6) (6) Adequate storage. Storage shall meet the following requirements when there is no elevated storage or the minimum pressure tank storage volume normally required by s. NR 811.61 (7) will be reduced due to the installation of one or more variable output control devices.

NR 811.34(6)(a) (a) For other-than-municipal water systems and small municipal water systems not provided with elevated storage, the gross pressure tank storage volume shall be a minimum of 2.5 times the design pump output in gallons per minute. When a vertical turbine pump requiring prelubrication or an auxiliary power source with an automatic transfer switch is employed, calculations shall be provided to the department to demonstrate that the storage volume is adequate to provide the necessary time for the prelubrication to occur or for the auxiliary power source to come on line before the system pressure drops below 20 psi as a result of a brief electrical power outage.

NR 811.34(6)(b) (b) For a control valve type of installation, the gross pressure tank storage volume shall be a minimum of 5 times the design pump output in gallons per minute to prevent the pump motor from over-heating.

NR 811.34(6)(c) (c) For booster or high-lift pump installations where the pump is discharging to a distribution system without elevated storage, the gross pressure tank storage volume shall be a minimum of 2.5 times the design pump output in gallons per minute.

NR 811.34(6)(d) (d) As an alternate to pars. (a) to (c), the department may approve other proposed pressure tank storage volumes when justified by supporting information submitted to the department.

NR 811.34(6)(e) (e) Control or piping and valve measures shall be provided to prevent water from becoming stagnant in pressure tanks. The variable output control device shall be programmed to allow a 10-psi pressure drop from pump ‘off’ mode to pump ‘on’ mode to allow time for the pressure tanks to empty.

NR 811.34(6)(f) (f) Additional storage volume shall be provided for adequate operation of water treatment equipment including storage volumes necessary to obtain required reaction or disinfection detention times in detention vessels. The storage volumes shall be calculated by the design engineer assuming the pump or pumps are discharging at the maximum possible rate.

NR 811.34(7) (7) Ventilation. Automatically controlled forced air ventilation shall be installed for any room where an electronic variable output control device will be installed and room temperatures will exceed 90 degrees F.

NR 811.34(8) (8) Measures to prevent damage from corrosive chemicals. The installation of an electronic variable output control device may not be allowed in a corrosive environment. Electronic variable output control devices may not be installed in the same room with fluoride acid chemical feed equipment. Preventive measures such as adequate sealing and ventilation of chemical containers and solution tanks shall be taken to minimize the production of corrosive fumes from other kinds of chemical feed installations, including sodium hypochlorite. The installation of a separate chemical feed room or the installation of room or chemical feed system ventilation improvements may be required by the department where significant damage from corrosive fumes has been documented.

NR 811.34(9) (9) Dehumidification or air conditioning. Dehumidification or air conditioning equipment shall be installed in any room where an electronic variable output control device will be installed and excessive moisture will be a concern.

NR 811.34 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10; CR 22-074: am. (6) (e) Register January 2024 No. 817, eff. 2-1-24.

NR 811.35 NR 811.35 Pitless units. Pitless units shall be installed in a manner to provide equivalent security, sanitary protection, accessibility, and operational flexibility to an above grade pump discharge installation and in accordance with the requirements of this section and as shown in Figure No. 7 in the Appendix.

NR 811.35(1) (1) Termination. Pitless units shall terminate a minimum of 12 inches above a concrete floor as required by ss. NR 811.12 (1) and 811.32 (1) (a). If the vent assembly is built into the pitless unit, the portion of the pitless unit where the bottom of the vent assembly is located shall be terminated a minimum of 24 inches above the concrete floor. Pitless units shall be provided with a protective concrete collar where they pass through the concrete floor as required by s. NR 811.32 (1) (c). The exterior exposed conduit pipe for the pump wiring shall be rigid steel and the conduit pipe incorporated into the concrete collar.

NR 811.35(2) (2) Enclosure. The exposed portion of a pitless unit shall be surrounded by a weather resistant, watertight, locked, and vented enclosure secured to a concrete floor as required by s. NR 811.25 (1) (i). The top surface of the concrete floor shall be located a minimum of 6 inches above the finished grade.

NR 811.35(3) (3) Appurtenances. The top of the pitless unit shall be sealed sanitarily in accordance with s. NR 811.32 (1) (b), provided with a well vent and water level measuring equipment in accordance with s. NR 811.36, and shall be provided with a frost-proof down-turned metal smooth-end sampling faucet terminating above the top of the pitless unit and a minimum of 12 inches above the concrete floor of the enclosure unless the sampling faucet is installed remote from the pitless unit in accordance with sub. (6) (h).

NR 811.35(4) (4) Discharge piping. Discharge piping from a pitless unit shall meet the following requirements:

NR 811.35(4)(a) (a) The discharge piping from the pitless unit shall be directed to a separate building located above grade where all of the applicable pump discharge piping appurtenances shall be installed in accordance with s. NR 811.37 and Figure No. 7 in the Appendix.

NR 811.35(4)(b) (b) The discharge piping from the pump in the well to the above grade pump discharge piping shall remain pressurized at all times. No provisions for drain back of the discharge piping may be allowed. A shut-off valve shall not be installed in the buried portion of the pitless unit discharge piping unless approved by the department as part of a pump-to-waste installation.

NR 811.35(4)(c) (c) The buried portion of a pitless unit discharge piping along with any joints or fittings shall be ductile iron, steel, or plastic piping meeting at minimum the AWWA pressure class 150 water main standards required under s. NR 811.69. Plastic piping shall not be used in areas where soil or groundwater contamination may be present. Plastic piping shall be transitioned to metal piping within 12 inches above the floor of the building into which it will be directed, under par. (a), unless minimum schedule 80 PVC pipe is installed in the building as allowed under s. NR 811.28 (5) (b).

NR 811.35(5) (5) Check valves. A check valve shall be installed in the submersible pump discharge piping in the well immediately above the pump. A check valve shall not be installed in the buried pitless unit discharge piping. A check valve may not be installed in the above grade pump discharge piping unless preceded by the pump on and off controls, or one or more pressure tanks, or unless the department approves an alternate method to maintain positive pressure in the piping under all operating conditions.

NR 811.35(6) (6) Specific installation requirements.

NR 811.35(6)(a) (a) Pitless units shall be factory assembled and pressure tested, full length units, with the make and model number having received individual department approval for use. The inside diameter of the pitless unit shall not be smaller than the inside diameter of the well casing pipe as required by s. NR 812.31 (2) (b).

NR 811.35(6)(b) (b) The department may not approve installation of a pitless unit unless any temporary outer well casing is totally removed from the well during the well construction process. Pitless units shall be attached only to the protective grouted well casing, including wells constructed with gravel packed screens.

NR 811.35(6)(c) (c) The top surface of the remaining well grout shall be no greater than one foot below the installation depth of the pitless unit, which is the well casing cut-off depth.

NR 811.35(6)(d) (d) The pitless unit shall be installed in accordance with the requirements of s. NR 812.31 (3) (a).

NR 811.35(6)(e) (e) Pitless units shall be installed by a licensed pump installer. The installed pitless unit shall be tested and proven watertight under a pressure of not less than 14 psig. The pressure shall be maintained for a minimum of 30 minutes. Additionally, any leaks detected shall be sealed during the pressure test. The installer shall notify the department a minimum of 48 hours before performing the pressure testing so that a department employee may witness the test. A report on the results of the pressure testing, signed by a licensed pump installer, shall be submitted to the department before placing the well in service.

NR 811.35(6)(f) (f) A certification by the licensed pump installer that installed the pitless unit confirming that the well was originally grouted to the ground surface and that the requirements of pars. (b) and (c) were met, shall be submitted to the department along with the pressure testing report and a copy of the well construction report.

NR 811.35(6)(g) (g) Backfilling of the excavation shall commence as soon as practical after the installation and a successful pressure test of the pitless unit.

NR 811.35(6)(h) (h) For slab-on-grade enclosures, a below grade length of pump discharge piping from the pitless unit, sufficient to extend beyond the enclosure, shall be installed prior to backfilling of the excavation and construction of the concrete floor slab. The buried piping shall be temporarily capped in a sanitary manner unless the piping is immediately extended and connected to the remainder of the system. During the installation of the discharge piping, if the sampling faucet riser pipe is not installed within the well and pitless unit, a metal riser pipe shall be extended vertically from the below grade discharge piping to terminate at a height a minimum of 12 inches above the top of the future concrete floor. The riser pipe shall be fitted with a frost-proof, down-turned, metal, smooth-end sampling faucet or shall be temporarily capped.

NR 811.35 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10; correction in (6) (intro.) made under s. 13.92 (4) (b) 7., Stats., Register November 2010 No. 659.

NR 811.36 NR 811.36 Well appurtenances.

NR 811.36(1) (1) Well vent. Each well shall be vented to the atmosphere in accordance with the following requirements:

NR 811.36(1)(a) (a) For wells without pitless units, a metal vent pipe shall be installed that terminates in a 24-mesh corrosion resistant screened “U” bend or mushroom cap at least 24 inches above the floor. The vent pipe diameter shall be a minimum of 2 inches for well casings 10 inches in diameter and larger. The department may, on a case-by-case basis, allow smaller diameter well vents on existing installations if water drawdown has not compromised the sanitary seal or require larger diameter well vents for wells with significant water level drawdown. Vent piping shall be welded watertight to the side of the well casing a minimum of 4 inches above the floor and may extend through a concrete pump base or collar where one is present. Alternatively, vent piping may project through a well seal or pump discharge head if the well seal or discharge head is watertight and will facilitate the installation of the vent pipe.

NR 811.36(1)(b) (b) For wells with pitless units, a metal vent pipe shall be installed which terminates in a 24-mesh corrosion resistant screened “U” bend or mushroom cap at least 24 inches above the floor. The pitless unit vent area shall be equal to or greater than the area provided by a 2-inch diameter vent pipe for pitless units 10 inches in diameter or larger. Vent piping shall extend above or be incorporated into the top of the pitless unit or be welded watertight to the side of the pitless unit a minimum of 4 inches above the floor and may extend through a concrete pump base or collar where one is present.

NR 811.36 Note Note: It is recommended that vent installations for pitless units be factory installed to prevent damage to the integrity of factory units and paint systems.

NR 811.36(1)(c) (c) If the well is flowing, the vent shall terminate above the artesian water level or a suitable automatic valve shall be provided.

NR 811.36(2) (2) Water level measurements.

NR 811.36(2)(a) (a) Provisions shall be made for measurement of static and pumping water levels in the completed well by the use of an electric depth gauge, pressure transducer or an air line attached to the pump column and an altitude gauge.

NR 811.36(2)(b) (b) The installation shall be constructed to prevent entrance of foreign material.

NR 811.36(2)(c) (c) Air lines may not be installed through vent pipes unless justified when modifications are being made to existing installations, the minimum 2-inch diameter vent pipe area is maintained where applicable, and the specific approval of the department is obtained.