NR 811.37 Note Note: It is recommended that pump-to-waste fittings installed inside the pump station be installed as close as possible to the well or pump head in order to minimize the piping and appurtenances that water to be wasted will be pumped through. The department recommends a valve and hydrant be installed outside the pump station on the buried pump discharge piping for municipal and subdivision water systems.

NR 811.37(5) (5) Pump discharge piping appurtenances. The following appurtenances shall be provided for pump discharge piping in addition to the means for pumping the well to waste required in sub. (4). Additional requirements for the installation of pump discharge piping and appurtenances for pitless unit installations are given in s. NR 811.35.

NR 811.37(5)(a) (a) Air-vacuum and air relief valves. The connecting and discharge lines for all air-vacuum and air relief valves shall be constructed of copper, ductile iron, steel, or stainless steel and shall face downward and terminate with a 24-mesh corrosion resistant screen, at least 24 inches above the floor. For line-shaft vertical turbine pump discharge pipes, an air-vacuum relief valve shall be installed between the pump and the check valve. For well line-shaft vertical turbine pump discharge pipes that discharge directly to reservoirs, the air relief valve is not required but a vacuum relief valve and a check valve are required. The installation of an air-vacuum relief valve is not required for submersible pump installations when check valves are installed at the pump and above grade, and there are no weep holes in the pump drop pipe unless entrained air in the well water or pressure surges are a concern and the installation of an air relief valve is necessary or required by the department.

NR 811.37(5)(b) (b) Sampling faucet. All pump discharge piping shall contain one or more sampling faucets meeting the following requirements:

NR 811.37(5)(b)1. 1. A water sampling faucet shall be installed and located upstream of any chemical addition or water treatment equipment to allow for the collection of raw water. If possible, the faucet shall be located prior to any above grade check valve.

NR 811.37(5)(b)2. 2. If chemical addition, water treatment, or water storage is installed, a second entry point sampling faucet shall be installed as far downstream of the chemical injection, water treatment, or water storage as practical. If necessary to obtain a water sample representing finished water quality, a water service lateral shall be brought back into the building and fitted with a sampling faucet after being connected to the building discharge water main outside the building.

NR 811.37(5)(b)3. 3. All sampling faucets shall be installed to terminate a minimum of 12 inches above the floor, have a down-turned smooth-end spout, be constructed of metal, have a minimum spout diameter of 0.25 inches, be installed directly on the piping conveying the water whenever possible, and be located in an area accessible for sampling.

NR 811.37(5)(c) (c) Check valve or other type of automatically closing valve. A check valve shall be provided except if prohibited at pitless unit installations under s. NR 811.35 (5). Where extreme surge pressures occur, slow opening valves, voltage ramped motors, or other means of surge protection shall be provided.

NR 811.37(5)(d) (d) Meters. All municipal well pump discharge pipes, all other-than-municipal well pump discharge pipes with pumps discharging at a rate greater than or equal to 70 gallons per minute or if chemical addition is practiced, all groundwater reservoir high-lift pumps if chemical addition is practiced, and all surface water low-lift and high-lift combined pump discharge pipes shall be provided with water meters to determine the quantity of water discharged.

NR 811.37 Note Note: It is recommended that an hour meter be installed for any pump motor where the pump discharge piping will not be provided with a water meter.

NR 811.37(5)(e) (e) Shut-off valve. A shut-off valve shall be provided.

NR 811.37(5)(f) (f) Pressure gauge. A pressure gauge shall be provided.

NR 811.37(5)(g) (g) Chemical injection tap. A chemical injection tap allowing chemical injection, shall be provided and installed in accordance with s. NR 811.39 (2) (f).

NR 811.37 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10; CR 22-074: am. (1), (5) (a), (b) 2. Register January 2024 No. 817, eff. 2-1-24.

subch. VI of ch. NR 811 Subchapter VI — Chemical Addition

NR 811.38 NR 811.38 General. This subchapter contains general requirements for the design and construction for chemical storage, handling, and addition facilities. Specific treatment design requirements are contained in subch. VII. Specific operating requirements are contained in subch. I of ch. NR 810. No chemicals may be applied to treat drinking water unless approved by the department. This requirement applies to first time application, temporary application, or when it is proposed to replace one chemical with another. The department shall be contacted prior to discontinuing the use of any chemical.

NR 811.38 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10.

NR 811.39 NR 811.39 Feed equipment.

NR 811.39(1) (1) Number of feeders. If chemical feed, such as chlorination, coagulation or other essential processes, is necessary to produce a water quality meeting the primary maximum contaminant levels, a minimum of 2 feeders shall be provided so that a standby unit or combination of units will be available to replace the largest unit during shut-downs. Spare parts shall be available for all feeders to replace parts which are subject to wear and damage.

NR 811.39(2) (2) Design and capacity. The design and capacity of chemical feed equipment shall meet all of the following requirements:

NR 811.39(2)(a) (a) Separate chemical feed systems. Separate chemical feed systems shall be provided in accordance with the following requirements:

NR 811.39(2)(a)1. 1. A separate feed system shall be provided for each chemical.

NR 811.39(2)(a)2. 2. Separate disinfection chemical feed systems shall be provided if pre- and post- water treatment disinfection application points are installed.

NR 811.39(2)(a)3. 3. Each chemical feed pump or gas feeder shall take suction from its own dedicated chemical solution tank or gas cylinders. The department may approve multiple chemical feed pumps or gas feeders for the same process application point taking suction from the same chemical solution tank or gas cylinders in the following situations:

NR 811.39(2)(a)3.a. a. Where multiple water sources are discharging to the same location. In this case, a means shall be provided for determining the flow from each individual water source.

NR 811.39(2)(a)3.b. b. Where multiple pumps are pumping from the same water source and discharging to the same location through a combined header pipe. In this case, a means shall be provided for measuring total flow.

NR 811.39(2)(a)3.c. c. For the situations in subd. 3. a. and b., a single chemical feeder with a single feed point or multiple chemical feeders with multiple feed points may be used, provided the installation meets the other requirements of this subchapter.

NR 811.39 Note Note: An example of subd. 3. a. would be multiple wells discharging to a single reservoir or water treatment plant. An example of subd. 3. b. would be multiple high-lift pumps taking suction from a single reservoir and discharging to a combined pump discharge pipe.

NR 811.39(2)(b) (b) Acceptable chemical feed pumps. Positive displacement diaphragm metering pumps, peristaltic chemical feed pumps or other pumps, as approved by the department, shall be used to feed liquid chemicals. Pumps shall be sized to match or exceed maximum head conditions found at the point of injection.