NR 812.37(4)(b)(b) The department may require operational procedures including installation of a sample faucet and an entry point sample faucet at specific locations, periodic sampling and analysis, device maintenance, and inspection provisions in its installation approval of a water treatment device.

NR 812.37(4)(d)(d) The department may require the water system owner or operator to shut off, bypass or disconnect a water treatment device installed upstream of the first sampling faucet after the well for a period of up to two weeks to obtain a sample of untreated water to analyze for coliform bacteria or other contaminants.

NR 812.37(4)(e)2.2. A spring loaded check valve is installed between the positive displacement-type feed pump and the point of injection to prevent backflow of untreated water into the solution tank.

NR 812.37(4)(e)4.4. The feed pump and the well pump are electrically wired in interlock with a flow switch connected in series from the feed pump into the well pump and there are no water outlets upstream of the point of fluoride or corrosion control chemical injection.

NR 812.37 HistoryHistory: Cr. Register, January, 1991, No. 421, eff. 2-1-91; am. (3) (d), (4) (e) (intro.), 1., 3. to 6., cr. (2) (i), (3) (h), Register, September, 1994, No. 465, eff. 10-1-94; corrections in (2) (a) and (c) made under s. 13.93 (2m) (b) 7., Stats., Register, May, 2000, No. 533; correction in (2) (a), (c), (d) 1., 3. made under s. 13.92 (4) (b) 6., 7., Stats., Register December 2011 No. 672; CR 13-099: am. (4) (a) Register September 2014 No. 705, eff. 10-1-14; CR 18-095: am. (1), (2) (b), (d), r. and recr. (2) (e), am. (2) (g), (i), cr. (2) (j), (k), am. (3) (a), (b), r. (3) (c), am. (3) (d), r. (3) (e), (f), am. (3) (g), cr. (3m), am. (4) (a), (b), r. (4) (c), am. (4) (d), (e) 5. Register June 2020 No. 774, eff. 7-1-20.; correction in (2) (k), (3) (g), (4) (e) 1. to 4. made under s. 35.17, Stats., Register June 2020 No. 774.

NR 812.38(1)(1) Potable water supplies or systems. Chemical addition to a potable well or water system may only be undertaken according to the requirements of s. NR 812.37. The injection of fertilizers or pesticides into a potable well or water system is prohibited. No person may inject fertilizers or pesticides into a potable well or water system. Fertilizers or pesticides may be used with potable water systems by repumping from a tank or a pond. The discharge from the well pump into a reservoir or pond shall have a free fall from a point at least 2 feet above the established reservoir or pond overflow elevation.

NR 812.38(2)(a)1.1. The injection of fertilizers into a nonpotable well, well pump suction pipe, or pump column is prohibited. No person may inject fertilizers into a nonpotable well, well pump suction pipe, or pump column.

NR 812.38(2)(a)2.2. Fertilizer may be injected in the discharge pipe of a booster pump delivering water from a tank or sealed pond into which the well pump discharges through an air gap from a point at least 2 discharge pipe diameters above the overflow level of the tank or pond.

NR 812.38(2)(a)3.3. Fertilizer may be injected into the well pump discharge pipe of a nonpotable water system if it is injected with a positive displacement type chemical feed pump or other approved equipment at a point downstream of a reduced pressure principle backflow preventer which complies with ch. SPS 384 and is installed in accordance with ch. SPS 382 or downstream of an UL approved check valve installed in the well pump discharge pipe at the well site. The chemical feed pump shall be shut off at least 10 minutes prior to shutting off of the well pump so as to purge the chemical from the water system.

NR 812.38(2)(a)4.4. Fertilizer 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(2)(b)1.1. The injection of pesticides into a nonpotable well, well pump suction pipe, or pump column is prohibited. No person may inject pesticides into a nonpotable well, well pump suction pipe, or pump column.

NR 812.38(2)(b)2.2. Pesticide may be injected in the discharge pipe of a booster pump delivering water from a tank or pond into which the well pump discharges through an air gap from a point at least 2 discharge pipe diameters above the overflow level of the tank or pond.

NR 812.38(2)(b)3.3. Pesticide may be injected into the well pump discharge pipe of a nonpotable water system if it is injected with a positive displacement type chemical feed pump or other approved equipment at a point downstream of a reduced pressure principle backflow preventer, which complies with ch. SPS 384 and is installed in the well pump discharge pipe at the well site but subject to the following conditions:

NR 812.38(2)(b)3.a.a. The department shall be notified by the owner of the nonpotable water system of when and where a reduced pressure principle backflow preventer is installed in a system and when it is removed,

NR 812.38(2)(b)3.c.c. The reduced pressure principle backflow preventer shall be installed above the regional flood level and the location shall be accessible for testing, inspection and maintenance,

NR 812.38(2)(b)3.d.d. The reduced pressure principle backflow preventer may not be bypassed or made inoperative nor removed from an irrigation system in which pesticides continue to be injected into the well pump discharge pipe,

NR 812.38(2)(b)3.e.e. Annual testing of the reduced pressure principle backflow preventer shall be conducted with a differential pressure gauge in accordance with the ASSE Standard 1013 testing method for reduced pressure principle backflow preventers by a DSPS listed backflow prevention device tester, and the owner of the system shall send a report of the test results to DSPS at least once each year, and

NR 812.38 NoteNote: Lists of DSPS approved reduced principle backflow preventers are available from DSPS. Listing as a tester of reduced pressure principle backflow preventers may be obtained following successful completion of a training course accepted by DSPS. Lists of testers willing to perform the required testing are available from DSPS.