NR 812.38(2)(b)4. 4. Pesticide may be introduced into the well pump discharge pipe of a nonpotable water system if it is aspirated into the well pump discharge pipe with a venturi-type aspirator and the injection point is downstream of a barometric pipe loop extending at least 35 feet above the highest part of the downstream discharge piping.

NR 812.38 History History: Cr. Register, January, 1991, No. 421, eff. 2-1-91; correction in (2) (b) 3. f. made under s. 13.93 (2m) (b) 7., Stats., Register, September, 1994, No. 465; corrections made under s. 13.93 (2m) (b) 7., Stats., Register, September, 1996, No. 489; correction in (2) (b) 3. made under s. 13.93 (2m) (b) 7., Stats, Register, May, 2000, No. 533; correction in (2) (a) 3., (b) 3. (intro.), b., e. made under s. 13.92 (4) (b) 6., 7., Stats., Register December 2011 No. 672; CR 18-095: am. (1), r. and recr. (2) (a) 1., (b) 1. Register June 2020 No. 774, eff. 7-1-20.

NR 812.39 NR 812.39 High capacity well water level and water usage measurement.

NR 812.39(1) (1) Well water level measurement. The department may require the installation and calibration of means for the measurement of static and pumping well water levels for any high capacity well and may require the operator of the well to submit monthly reports of this information. Installation shall be made in a manner as to prevent entrance of contaminants to the water system and in compliance with approval conditions and as depicted in Figure 3 of ch. NR 812 Appendix.

NR 812.39(1)(a) (a) When an air line with altitude gauge is installed in a well, the equipment and installation shall meet the following requirements:

NR 812.39(1)(a)1. 1. When the top of the well is not housed in a pumphouse or other structure, that portion of the air line extending above the pump discharge head or well seal, and to a depth of at least 3 feet into the well, shall be metal or shall be fiber or wire-braided reinforced tubing. An “air quick-disconnect” fitting shall be installed for the top of the air line such that the altitude or pressure gauge may be easily removed and stored in a dry place when water levels are not being measured. The “air quick-disconnect” fitting shall be installed to point downward or shall be capped such that contaminants cannot enter the air line.

NR 812.39(1)(a)2. 2. A silicone rubber sealant or a watertight threaded metal fitting shall be used to seal the opening in the pump discharge head or the well seal through which the air line extends.

NR 812.39(1)(b) (b) When an electrical water level sensing device, a steel tape or similar means for use in measuring water levels is used in lieu of an air line with altitude gauge, the opening in the pump discharge head or well seal used for the measurements shall be sealed watertight when water levels are not being measured.

NR 812.39(2) (2) Recording total water usage. The department may require the installation and calibration of means for the recording of total water usage from a high capacity well and shall require the operator of the well to submit monthly reports of this information.

NR 812.39 History History: Cr. Register, January, 1991, No. 421, eff. 2-1-91; CR 18-095: am. (1), (2) Register June 2020 No. 774, eff. 7-1-20.

NR 812.40 NR 812.40 Above ground pumphouses. When a structure is constructed to house a well, pump, pressure tank, other appurtenances or any combination thereof, the structure shall be weather- and frost-proof, if needed. Above ground pumphouses shall be constructed with the following minimum features:

NR 812.40(1) (1) When a poured-concrete floor is provided, the top of the floor shall be at least 4 inches above the established ground grade and sloped toward the drain or door, or away from the well. A watertight bond shall be provided between the well casing pipe and the concrete;

NR 812.40(2) (2) A door opening outward when the structure is large enough, or a trapped floor drain discharging to the ground surface at least 8 feet from the well when a door is not installed;

NR 812.40(3) (3) Protection from freezing for the well, pressure tank and piping, if needed;

NR 812.40(4) (4) Hinged roof or removable hatch over the well or some provision for pulling the pump; and

NR 812.40(5) (5) The structure may not be used for storage of materials that could contaminate the well.

NR 812.40 History History: Cr. Register, January, 1991, No. 421, eff. 2-1-91; am. (intro.), Register, September, 1994, No. 465, eff. 10-1-94; CR 18-095: am. (5) Register June 2020 No. 774, eff. 7-1-20.

NR 812.41 NR 812.41 Disinfection, flushing and sampling.

NR 812.41(1) (1) Disinfection. When a potable well is entered for the purpose of installing, replacing or repairing equipment located within the well, the well and discharge piping shall be thoroughly disinfected by the pump installer or by the person who installed the pump using sodium hypochlorite or calcium hypochlorite. Chlorine compounds having additives may not be used.

NR 812.41(1)(a) (a) The disinfectant shall be dispersed throughout the entire water column and in the water system.

NR 812.41(1)(b) (b) A chlorine solution with a minimum of 100 mg/l of chlorine shall be used to disinfect wells and water systems.

NR 812.41(1)(c) (c) The disinfectant solution shall be prepared according to Table D and shall remain in the system at least 8 hours, except for emergency situations when water is needed without delay. A contact time of at least 30 minutes shall be provided for emergency situations.

NR 812.41(2) (2) Flushing. The pump installer or his or her agent shall thoroughly flush the system of chlorine after disinfecting and before the pump is placed in normal service.

NR 812.41(3) (3) Water sample collection, analysis, and reporting. The pump installer shall collect water samples, submit them to a certified laboratory for analysis, and provide the test results in compliance with s. NR 812.46.

NR 812.41 History History: Cr. Register, January, 1991, No. 421, eff. 2-1-91; am. (1) (intro.), (3) (a), (c), Register, September, 1994, No. 465, eff. 10-1-94; CR 13-099: r. and recr. (3), cr. (4) Register September 2014 No. 705, eff. 10-1-14; CR 18-095: am. (1) (c), r. and recr. (3), r. (4) Register June 2020 No. 774, eff. 7-1-20.

subch. IV of ch. NR 812 Subchapter IV — Standards for Existing Installations

NR 812.42 NR 812.42 Criteria for evaluation. Each existing water system shall be viewed as an individual unit and its acceptability for use as a source of water shall be determined on the basis of its location, construction, installation, pump discharge piping arrangement, water quality, and sanitary condition. The owner shall provide written documentation verifying the date of construction or installation or both. Existing installations shall meet all of the following requirements:

NR 812.42(1) (1) Location, well construction and water quality.

NR 812.42(1)(a) (a) Location. The well location shall comply with the requirements in effect at the time the well was constructed as shown in Table E, or to the location requirements of s. NR 812.08, whichever is less restrictive. However, if a contamination source was installed after the well was constructed, the well location shall conform to the requirements in effect at the time of installation of the contamination source.