Chapter NR 811

NR 811.21(2) (2) Quantity. The quantity of the water at the source shall:

NR 811.21(2)(a) (a) Be adequate in conjunction with water from other existing sources to meet the maximum 20-year projected water demand of the service area, as shown by calculations based on a one in 50-year drought or the extreme drought of record, and shall include multiple year droughts.

NR 811.21 Note Note: The department recommends water systems using a surface water supply source are provided with redundant intakes or an alternative means of supplying the maximum day water demand.

NR 811.21(2)(b) (b) Provide a reasonable reserve for anticipated growth.

NR 811.21(2)(c) (c) Be adequate to provide ample water for other legal users of the source in accordance with ss. 30.18, 31.02, 281.35, and 281.41, Stats., and ch. NR 142.

NR 811.21(3) (3) Location. The inlet for the intake shall not be located:

NR 811.21(3)(a) (a) Within 1,000 feet of boat launching ramps, marinas, docks, or floating fishing piers which are accessible by the public.

NR 811.21(3)(b) (b) In areas subject to excessive siltation or in areas subject to receiving immediate runoff from wooded sloughs or swamps.

NR 811.21(3)(c) (c) Within 1,000 feet of a wastewater treatment plant outfall outlet.

NR 811.21(4) (4) Minimum treatment. The design of the treatment processes, equipment, and structures shall depend on an evaluation of the nature and quality of the particular water to be treated.

NR 811.21(4)(a) (a) The design of the water treatment plant must consider the worst conditions that are projected to occur during the life of the facility.

NR 811.21(4)(b) (b) Filtration preceded by appropriate pretreatment shall be provided for all surface waters.

NR 811.21(4)(c) (c) Disinfection shall be provided for all surface waters.

NR 811.21(4)(d) (d) Additional treatment may be required by the department based on raw water sampling and other water quality factors.

NR 811.21 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10; CR 22-074: am. (intro.), (1) (intro.), (b), (e), (2) (a) Register January 2024 No. 817, eff. 2-1-24.

NR 811.22 NR 811.22 Intakes. Intake structures shall provide for all of the following:

NR 811.22(1) (1) Velocity of flow .25 to .50 feet per second through the inlet structure so that frazil ice will be held to a minimum.

NR 811.22(1m) (1m) Sufficient opening area to minimize headloss shall be provided when buried surface water collectors are used. Particular attention should be given to the selection of backfill material in relation to the collector pipe slot size and gradation of the native material over the collector system.

NR 811.22 Note Note: The department recommends water systems using a surface water supply source include redundant intakes or an alternate means of supplying the maximum day water demand.

NR 811.22(2) (2) Withdrawal of water from the depth of the best water quality or the capability to draw from more than one level or more than one location if water quality varies with depth or location or both.

NR 811.22(3) (3) Inspection manholes every 1,000 feet.

NR 811.22(3m) (3m) Means for cleaning of the inlet pipe.

NR 811.22(4) (4) Adequate protection against rupture by dragging anchors, ice, and other activity.

NR 811.22(5) (5) Locations referenced by permanent monuments or latitude and longitude as measured by a Global Positioning System (GPS).

NR 811.22(6) (6) A diversion device capable of keeping large quantities of fish or debris from entering an intake structure where shore wells are not provided.

NR 811.22(7) (7) Control of nuisance organisms where necessary in accordance with s. NR 811.232.

NR 811.22 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10; CR 22-074: cr. (1m), am. (3), cr. (3m) Register January 2024 No. 817, eff. 2-1-24.

NR 811.23 NR 811.23 Shore wells.

NR 811.23(1) (1) Shore well structures shall comply with all of the following:

NR 811.23(1)(a) (a) Have motors and electrical controls located above grade and above flood level.

NR 811.23(1)(b) (b) Be accessible for operation and service.

NR 811.23(1)(c) (c) Be designed to prevent flotation.

NR 811.23(1)(d) (d) Be equipped with a minimum of 2 removable or traveling screens or an equivalent means of screening before the pump suction well. Systems with only one screen shall be provided with a bypass.

NR 811.23(1)(e) (e) Provide chlorination or other chemical addition facilities for raw water transmission mains.

NR 811.23(1)(f) (f) Have the intake piping valved with provisions for backflushing, testing for leaks, and control of frazil ice.

NR 811.23(1)(g) (g) Have provisions for controlling surges.

NR 811.23(1)(h) (h) Have sloped bottoms.

NR 811.23(1)(i) (i) Be designed so sanitary sewer and finished water piping located within the shore well is installed in a manner to protect the shore well water quality and preserve the quality of the finished water. It is recommended that piping not be installed above the shore well to allow for access to the piping for routine maintenance.

NR 811.23(1)(j) (j) Water discharged from traveling screens and hub drains within the shore well station may discharge into the shore well.

NR 811.23(2) (2) The requirements in sub. (1) may be waived by the department on a case-by-case basis if it is demonstrated that they are not necessary to fulfill the other requirements of this chapter.

NR 811.23 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10; CR 22-074: am. (1) (f), cr. (1) (i), (j) Register January 2024 No. 817, eff. 2-1-24.

NR 811.231 NR 811.231 Off-Stream raw water storage.

NR 811.231(1) (1) Definition. In this section, “off-stream raw water storage reservoir” is defined as a facility into which water is pumped during periods of good quality and high stream flow for future release to the treatment facilities.

NR 811.231(2) (2) Construction. Off-stream raw water storage reservoirs shall be constructed to assure all of the following:

NR 811.231(2)(a) (a) Water quality is protected by controlling runoff into the reservoir.

NR 811.231(2)(b) (b) Dikes are structurally sound and protected against wave action and erosion.

NR 811.231(2)(c) (c) Intake structures meet the requirements of s. NR 811.22.

NR 811.231(2)(d) (d) Point of influent flow is separated from the point of withdrawal, with separate pipes for influent to and effluent from the reservoir.

NR 811.231(2)(e) (e) Water is regularly circulated to prevent stagnation.

NR 811.231(2)(f) (f) The reservoir is surrounded by a fence and unauthorized access is prevented.

NR 811.231(2)(g) (g) The reservoir is covered.

NR 811.231(2)(h) (h) The requirements of s. NR 811.47 (7) are met if the reservoir is to be used as a pre-sedimentation basin.

NR 811.231(2)(i) (i) A bypassing line is provided to allow for direct pumping to the treatment facilities.

NR 811.231 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10; CR 22-074: am. (2) (d), (g), cr. (2) (i) Register January 2024 No. 817, eff. 2-1-24.

NR 811.232 NR 811.232 Intake chemical treatment.

NR 811.232(1) (1) If the department determines that chemical treatment is warranted for taste and odor control or the control of zebra and other mussels and other nuisance organisms in an intake structure, all of the following requirements shall be met:

NR 811.232(1)(a) (a) Chemical treatment shall be installed in accordance with subch. VI and plans and specifications shall be approved by the department prior to installation.

NR 811.232(1)(b) (b) Solution piping and diffusers shall be installed within the intake pipe or in a suitable carrier pipe. Provisions shall be made to prevent dispersal of chemicals into the water environment outside the intake. Diffusers shall be located and designed to protect all intake structure components.

NR 811.232(1)(c) (c) A spare solution line shall be installed to provide redundancy and to facilitate the use of alternate chemicals.

NR 811.232(1)(d) (d) Chemical feeders shall be interlocked with the plant system controls to shut down the chemical feed pump automatically when the raw water flow stops.

NR 811.232(1)(e) (e) A sample line out to the intake shall be provided which will allow for collecting raw water samples unless the chemical control system will be shut off for periods sufficient to collect raw water samples at the shore well.

NR 811.232(2) (2) The department may require pilot testing or demonstration studies of alternate intake treatment. Studies shall satisfy the requirements under s. NR 811.44.

NR 811.232 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10; renumbering of (1) to (4) made under s. 13.92 (4) (b) 1., Stats., Register November 2010 No. 659; CR 22-074: renum. (intro.), (1), (2), (3) to (1) (intro.), (a), (b), (c) and am. (1) (intro.), (c), cr. (1) (d), (2), renum. (4) to (1) (e) Register January 2024 No. 817, eff. 2-1-24.

subch. IV of ch. NR 811 Subchapter IV — Pumping Stations, Pumphouses, and Water Treatment Plant Buildings

NR 811.24 NR 811.24 General requirements. All water system related buildings shall be designed to maintain the sanitary quality of the water supply. Buildings subject to the requirements of this subchapter include surface water and groundwater water treatment plant buildings, structures and pumping stations, well pumphouses and enclosures, and booster pumping stations. Uses of the buildings shall be compatible with the protection of the water supply.

NR 811.24 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10.

NR 811.25 NR 811.25 Buildings.

NR 811.25(1) (1) Construction. All water system related buildings under s. NR 811.24 shall meet all of the following requirements:

NR 811.25(1)(a) (a) Have adequate space for the installation of additional pumping units, water treatment equipment, chemical feed equipment, or controls, if needed, and for the safe servicing of all equipment.

NR 811.25(1)(b) (b) Be durable, fire and weather resistant, and constructed in a manner to maximize sanitary protection of the water supply.

NR 811.25(1)(c) (c) Be secure. Buildings shall have at least one outward opening door to the outside. All doors, windows, and hatches shall have locks. Any security alarms installed shall be connected to telemetry control and SCADA systems where such systems are used.

NR 811.25(1)(d) (d) Be landscaped to conduct surface drainage away from the station and have a floor elevation at least 6 inches above the finished grade and at least 2 feet above the regional flood elevation as determined in s. NR 116.07 (4). Buildings shall be provided with year round dry land access. Below grade installations may be permitted only if the terrain at the site is such that a gravity drain system can be provided. Subsurface pits or pumprooms and inaccessible installations intended to house well heads, pumps, pump motors, or pump controls for pumping stations are prohibited except for below grade booster pumping stations as allowed per s. NR 811.80 (3) and (4).

NR 811.25(1)(e) (e) Provide for all floors to drain so that floor runoff does not enter the treatment process or source water. Floors shall be sloped to a drain or sump.

NR 811.25(1)(f) (f) Provide a suitable outlet for drainage water from pump glands so that the disposal of any drainage water is piped to waste or otherwise disposed of in a controlled manner. Pump gland drainage piping shall not be directly connected to a hub drain or a floor drain.

NR 811.25(1)(g) (g) Be provided with concrete floors.

NR 811.25(1)(h) (h) Be provided with at least one floor drain meeting the following requirements:

NR 811.25(1)(h)1. 1. Floor drains and hub drains shall be properly separated from a well. A floor or hub drain and associated piping accepting water from pump gland drainage, a pressure relief or control valve, a sampling faucet, or the floor shall be located no closer than 2 feet to the outer well casing. No building drain piping, except that piping leading to the aforementioned floor or hub drains, containing blackwater or graywater, may be located closer than 8 feet to the outer well casing.

NR 811.25(1)(h)2. 2. Floor drains and hub drains shall have a discharge location that complies with all of the following requirements:

NR 811.25(1)(h)2.a. a. Floor drains and hub drains may be connected to a sanitary sewer where available if the building floor elevation is at least one foot above the rim elevation of the nearest upstream sanitary sewer manhole. If a sanitary sewer is available but a manhole is not located nearby or the manhole does not comply with the upstream location or the one foot requirement, the department may require installation of an additional manhole on the sanitary sewer main or on the sanitary building sewer.

NR 811.25 Note Note: The department recommends that the floor drains from chemical feed rooms discharge to a sanitary sewer whenever practicable.

NR 811.25(1)(h)2.b. b. Floor drains and hub drains may discharge to the ground surface if the building drain and building sewer piping will only carry water from the floor or hub drain, the discharge location shall be at least 25 feet from the pumphouse, the exterior invert of the building sewer pipe shall be at least 6 inches below the building floor elevation and the exterior pipe opening shall be covered with a corrosion resistant rodent screen. A greater distance may be required for drains of pump stations serving wells constructed in sand and gravel formations. The piping shall terminate in a location that will not allow backflow of surface water into the building.

NR 811.25(1)(h)2.bm. bm. A floor drain or hub drain may be connected to a storm sewer where available if the building drain and building sewer piping will only carry water from the floor or hub drain and if the building floor elevation is at least one foot above the rim elevation of the nearest upstream storm sewer manhole. If a storm sewer is available but a manhole is not located nearby or the manhole does not comply with the upstream location or the one-foot requirement, the department may require installation of an additional manhole on the storm sewer main or on the building sewer discharge line.

NR 811.25(1)(h)2.c. c. Floor drains and hub drains may discharge to a buried tank located a minimum of 50 feet from the well if the discharge to the building drain and building sewer piping will contain only water from pump gland drainage, a pressure relief or control valve, a sampling faucet or floor drainage. These buried tanks may not be installed unless approved by the department’s bureau of watershed management wastewater section prior to installation. Floor drains and hub drains may discharge to a POWTS holding component located a minimum of 200 feet from the well if the discharge will contain toilet, sink or other sanitary or domestic waste. These POWTS holding components may not be installed unless approved by the department of safety and professional services prior to installation. In either case the rim elevation of the access manhole to the tank shall be at least one foot below the building floor elevation and a high water alarm shall be installed for the tank in accordance with the requirements of s. SPS 383.43 (8) (e).

NR 811.25(1)(h)2.d. d. Soil infiltration components, including french drains, are prohibited.

NR 811.25(1)(h)3. 3. The drain may be a trench drain system if the lowest elevation of any trench drain complies with subd. 2. a. Where trench drains are to be connected to a sanitary sewer and compliance with subd. 2. a. is not possible, a sump containing a sump pump shall be installed in the trench to discharge the trench water with a minimum 2 pipe diameter free air break over a hub drain. The top elevation of the hub drain shall be at least one foot above the elevation of the nearest upstream sanitary sewer manhole rim. Where trench drains will discharge to grade the exterior invert of the building sewer pipe shall be at least 6 inches below the lowest elevation of the trench drain and the exterior pipe opening shall be covered with a corrosion resistant rodent screen.

NR 811.25(1)(h)4. 4. Floor drains shall be constructed of department of safety and professional services approved plumbing materials. The building drain piping shall be constructed of cast iron or PVC piping within 10 feet of the outer well casing.

NR 811.25(1)(i) (i) Pitless units shall be provided with a locked and vented watertight enclosure fastened watertight to a concrete floor. The enclosure shall be weather resistant, of sufficient size to accommodate all well appurtenances and electrical or auxiliary power connections and be accessible for year-round inspection, water sample collection, and water level data collection. Any enclosure vents shall be shielded from the elements and wind-blown debris and the vent openings shall be covered with 24-mesh corrosion resistant screens. Backfill material for slab-on-grade enclosures shall be compacted in lifts. Any slab-on-grade concrete floor shall have minimum dimensions of 4 feet by 4 feet by 6 inches thick and be provided with reinforcing.

NR 811.25(1)(j) (j) A small, doghouse-type, enclosure may be installed over a well and abbreviated above grade pump discharge piping where chemical addition equipment or hydro-pneumatic pressure tank storage is located remote from the well. The department may waive portions of the building installation requirements for small enclosures. The enclosure shall be secured watertight to a concrete floor and allow for convenient access to the well, piping and any appurtenances. The enclosure shall be locked as applicable. If a floor drain will not be installed, the floor shall be sloped to drain toward the access door if one is provided.

NR 811.25(2) (2) Equipment servicing. Pumping stations shall be provided with all of the following: