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.

NR 812.42(1)(b) (b) Well construction.

NR 812.42(1)(b)1. 1. The well construction shall comply with the construction requirements in effect at the time the well was constructed or shall be in compliance with any standards or approval issued under ss. NR 812.09 to 812.25, except if the well was constructed prior to April 10, 1953, in which case the well construction shall be in compliance with the standards adopted on April 10, 1953.

NR 812.42(1)(b)2. 2. The well casing pipe shall meet the minimum wall thickness requirements of s. NR 812.11 Table B for its diameter and may not be in a deteriorated condition.

NR 812.42(1)(b)3. 3. For wells in basements or walkout basements, the well casing pipe depth shall be measured from the floor of the basement.

NR 812.42(1)(b)4. 4. Wells completed in unconsolidated formations, including both drilled and driven point wells, shall have minimum well casing pipe depth settings of at least 25 feet below the ground surface, not including the screen; or, if the static water level is deeper than 15 feet, shall have the minimum well casing pipe depth setting at least 10 feet below the static water level.

NR 812.42(1)(b)5. 5. Wells completed in sandstone shall have minimum well casing pipe depth settings below the ground surface as follows:

NR 812.42(1)(b)5.a. a. Twenty-five feet for wells constructed before February 1, 1991.

NR 812.42(1)(b)5.b. b. Thirty feet for wells constructed on or after February 1, 1991.

NR 812.42(1)(b)6. 6. Wells terminating in limestone or dolomite shall have minimum well casing pipe depth settings below the ground surface as follows:

NR 812.42(1)(b)6.a. a. Forty feet for wells constructed before July 1, 2020.

NR 812.42(1)(b)6.b. b. Sixty feet when the depth to bedrock is less than 10 feet below the ground surface and the well was constructed between February 1, 1991 and July 1, 2020.

NR 812.42(1)(b)6.c. c. Sixty feet when the depth to bedrock is less than 20 feet below the ground surface and the well was constructed after July 1, 2020.

NR 812.42(1)(b)7. 7. Wells terminating in bedrock other than sandstone, limestone, or dolomite shall have a minimum of 40 feet of casing pipe below the ground surface.

NR 812.42(1)(c) (c) Water quality. A well shall produce water free from coliform bacteria and free from contaminant levels in excess of the standards of s. NR 812.06. If the standards of s. NR 812.06 are exceeded, the department may require the water system to be upgraded to meet the requirements of this chapter or may require the well to be filled and sealed according to the criteria and requirements of s. NR 812.26.

TABLE E

HISTORIC MINIMUM SEPARATION DISTANCE REQUIREMENTS BETWEEN EXISTING POTABLE OR NONPOTABLE WELLS, RESERVOIRS, AND SPRINGS AND POSSIBLE SOURCES OF CONTAMINATION

- See PDF for table

NR 812.42(2) (2) Pits and alcoves. Existing well or pressure tank pits and alcoves constructed after April 10, 1953 shall comply with the minimum requirements specified in s. NR 812.36 (2). When a well in a pit is filled and sealed, the pit shall be filled in accordance with s. NR 812.26 (5) (m) unless the pit is a complying valve pit. If a building is constructed over a well pit or alcove, the well shall meet the requirements of a basement well as specified in s. NR 812.42 (9). Pits and alcoves constructed on or before April 10, 1953 shall meet the following minimum requirements:

NR 812.42(2)(a) (a) Construction. The entire pit or alcove, including the roof, shall be constructed of reinforced watertight poured concrete. If the pit or alcove has a history of being continuously dry, walls of concrete block, brick, or stone with mortared joints are allowed. The walls, floor and roof shall be crack-free and watertight. The junction of walls and floors and all openings in the structure shall be sealed watertight. The roof or deck shall be at or above the ground surface. Requirements for existing pits are shown in Figure 10 of ch. NR 812 Appendix. Requirements for existing alcoves are shown in Figure 11 of ch. NR 812 Appendix.

NR 812.42(2)(b) (b) Access. The pit or alcove shall be provided with a manhole opening, having a raised curbing edge at least 4 inches higher than the pit or alcove roof. A structurally substantial, waterproof, overlapping, tight-fitting cover with skirted sides shall be provided for the manhole. A watertight, cast-iron manhole frame and cover bolted in place with a gasket may be substituted for a curbed manhole. An alcove adjoining a basement or a pit not having the manhole centered over the well may have a section of well casing pipe installed directly above the well. This pipe shall be equal in size or larger than the well casing pipe and it shall be sealed with an approved well seal or cap.

NR 812.42(2)(c) (c) Drainage. An alcove adjoining a basement where the basement is subject to flooding shall be discontinued for use as a well pit and the well shall be filled and sealed according to s. NR 812.26. The alcove need not be filled and sealed. A pit or alcove drain or sump pump discharge pipe may not be directly connected to a sewer or other plumbing system. If the alcove drain discharge pipe is discharging to the ground surface, the end of the discharge pipe shall be screened.

NR 812.42(2)(d) (d) Casing height. The well casing pipe shall terminate at least 6 inches above the floor of a pit or alcove and shall be provided with a one-piece sanitary well seal approved for use under s. NR 812.091.