NR 811.17(1)(1) The department may approve infiltration lines only when it is not feasible to develop a drilled well. NR 811.17(3)(3) The supplier of water shall have control of the area around the infiltration lines for a distance approved by the department. NR 811.17 HistoryHistory: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10. NR 811.18NR 811.18 Special requirements for sandstone wells. The requirements of this section apply to wells drilled in formations commonly referred to as sandstones in Wisconsin. This includes the St. Peter sandstone, the Upper Cambrian sandstones, and the Lake Superior sandstone. All of the following requirements shall be met: NR 811.18(1)(1) The minimum depth of the grouted casing shall be 60 feet. The grouted casing shall be installed to a depth of 10 feet below the anticipated pumping water level, except in cases when the department determines that this requirement is not necessary to meet the requirements of this chapter. NR 811.18(2)(2) If the sandstone is overlain by creviced limestone or shale formations, the grouted casing shall be installed a minimum of 15 feet into firm sandstone. The department shall be contacted for the required depth of grouted casing for locations where this type of construction will be required. Wells constructed to utilize aquifers beneath the Maquoketa shale shall be cased and grouted to beneath the depth of the Maquoketa shale. NR 811.18(3)(3) If the depth of unconsolidated material is more than 60 feet, the grouted casing shall be seated in firm sandstone if the sandstone is the upper rock formation. NR 811.18(4)(4) If the depth of unconsolidated material is less than 60 feet and the sandstone is the upper rock formation, the department shall be contacted for the required depth of grouted casing. NR 811.18 HistoryHistory: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10. NR 811.19NR 811.19 Special requirements for limestone or dolomite wells. This section applies to wells drilled in formations commonly referred to as limestones and dolomites in Wisconsin. This includes the Niagara dolomite, the Galena-Platteville dolomite and the Prairie du Chien dolomite. When an acceptable sandstone aquifer can be utilized, construction of limestone or dolomite wells should be avoided. The following requirements apply to wells located in limestone and dolomite aquifers which are not overlain by consolidated shale or sandstone formations. NR 811.19(1)(1) At a minimum, continuous disinfection, and possibly detention, shall be provided when the department determines that additional protection is necessary. NR 811.19(2)(2) Continuous disinfection shall be provided for wells with less than 60 feet of grouted casing. NR 811.19(3)(3) If the depth of unconsolidated material overlying the limestone is 60 feet or greater for a minimum radius of one-half mile and there is no record of sinkholes, quarries, improperly constructed wells, or outcrops within that area, the minimum depth of grouted casing shall be 60 feet. The department may require greater depths of grouted casing in areas where there is known bacteria or nitrate concentrations exceeding drinking water standards. The casing shall be installed to a depth of 10 feet below the anticipated pumping water level unless the department waives this requirement after finding it unnecessary in meeting the requirements of this chapter. NR 811.19(4)(4) If the depth of unconsolidated material is more than 60 feet and only 60 feet of grouted casing is required by the department, the casing shall be seated in firm limestone. NR 811.19(5)(5) If the depth of unconsolidated material is less than 60 feet at the well site or within one-half mile of the well site, the water system owner shall contact the department to determine the required minimum depth of grouted casing. An inner casing size of at least 12 inches in diameter shall be required to permit the installation of a grouted liner at a future date if the water from the well shows evidence of contamination. The department may waive the casing size requirement if it is demonstrated that it is unnecessary to meet the requirements of this chapter, but in that case a minimum of 100 feet of grouted casing is required. NR 811.19 HistoryHistory: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10; CR 22-074: am. (3), (5) Register January 2024 No. 817, eff. 2-1-24; correction in (5) made under s. 35.17, Stats., Register January 2024 No. 817. NR 811.20NR 811.20 Special requirements for granite wells. The department shall be contacted for specific case-by-case constructional requirements for all proposed developments of wells in Precambrian igneous and metamorphic rock commonly referred to as “granite”. At a minimum, continuous disinfection and possibly detention, shall be provided when the department determines that additional protection is necessary. NR 811.20 HistoryHistory: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10. NR 811.21NR 811.21 General requirements. Surface water sources include all lakes, rivers, and streams. The source of water selected by the water system owner as a surface water supply shall be from the best available source practicable. The source shall provide the highest quality water reasonably available which, with appropriate treatment and adequate safeguards, will meet the drinking water standards under ch. NR 809. The water system owner shall contact the department’s office of energy to initiate pre-application consultation regarding ch. 30, Stats., permitting. Any proposal that will result in a diversion from the Great Lakes basin requires department approval under s. 281.346, Stats. A water system that utilizes a surface water source shall meet all of the following requirements: NR 811.21(1)(1) Quality. The water system owner shall conduct an investigative study that includes both natural and man-made factors that may affect water quality of the selected surface water supply. The study shall include all of the following: NR 811.21(1)(b)(b) Determining degree of control of the watershed by the water system. NR 811.21(1)(c)(c) Assessing degree of hazard to the water supply by agricultural, industrial, recreational, shipping and residential activities in the watershed, and by accidental spillage of materials that may be harmful or detrimental to the treatment process. NR 811.21(1)(d)(d) Assessing all waste discharges, point source and non-point source, and activities that could impact the water supply. The location of each waste discharge shall be shown on a scale map. NR 811.21(1)(e)(e) For lakes, an analysis of the area water currents and for streams, an analysis of streamflows, and their potential impact on water quality. Consideration shall be given to potential wind and ice conditions. NR 811.21(1)(f)(f) Obtaining samples that are representative of the proposed intake structure based on depth and location. Parameters that may be subject to seasonal variation shall be taken for a period of up to one year or over a sufficient period of time to assess such variation. Testing shall include turbidity, pH, alkalinity, hardness, bromide, total organic carbon, color, taste and odor, ammonia, microbiological organisms, heavy metals including lead and copper, volatile organics, synthetic organics, inorganics, and radiological characteristics of the water. The microbiological testing shall satisfy the Long Term 2 Enhanced Surface Water Treatment Rule requirements found in ss. NR 809.33 to 809.335. The source water shall meet the surface water quality standards in ch. NR 102. 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 NoteNote: 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(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)(d)(d) Additional treatment may be required by the department based on raw water sampling and other water quality factors. NR 811.21 HistoryHistory: 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 811.22NR 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 NoteNote: 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(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 HistoryHistory: 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(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)(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)(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 HistoryHistory: 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 811.231NR 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)(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)(f)(f) The reservoir is surrounded by a fence and unauthorized access is prevented. NR 811.231(2)(i)(i) A bypassing line is provided to allow for direct pumping to the treatment facilities. NR 811.231 HistoryHistory: 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(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.
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