(a) Water for milkhouse and milking operation shall be from a supply properly located, protected and operated, and shall be easily accessible, adequate and of a safe, sanitary quality.

(b) The water supply shall contain an MPN (most probable number of coliform organisms) of less than 1.1 per 100 ml by the multiple tube fermentation method, or less than 1.1 per 100 ml by the membrane filter technique, or absent (less than 1 per 100 ml) by the chromogenic substrate (MMO-MUG) presence-absence method.

(c) No cross-connection shall exist between a safe water supply and any unsafe or questionable water supply, or any other source of pollution.

(d) There shall be no submerged inlets through which a safe water supply may be contaminated.

(e) The well or other source of water shall be located and constructed in such a manner that neither underground nor surface contamination from any sewerage systems, privy or other source of pollution can reach such water supply. All drilled wells constructed after the effective date of this Part shall have casings extended above the surface level of the surrounding ground.

(f) New individual water supplies and water supply systems which have been repaired or otherwise become contaminated shall be thoroughly disinfected before being placed in use. The supply shall be made free of the disinfectant by pumping to waste before any sample for bacteriological testing shall be collected.

(g) Water supplies which are otherwise found satisfactory but which are unable to meet the bacteriological standards set forth in this section shall be subjected to continuous disinfection by a method and with equipment acceptable to the commissioner.

(h) All containers and tanks used in the transportation of water shall be sealed and protected from possible contamination. These containers and tanks shall be subjected to a thorough cleaning and a bacteriological treatment prior to filling with potable water to be used at the dairy farm. To minimize the possibility of contamination of the water during its transfer from the potable tanks to the elevated or groundwater storage at the dairy farm, a suitable pump, hose and fittings shall be provided. When the pump hose and fitting are not being used, the outlets shall be capped and stored in a suitable dust-proof enclosure so as to prevent their contamination. The storage tank at the dairy farm shall be constructed of impervious material provided with a dustproof and rainproof cover, and also provided with an approved-type vent and roof hatch. All new reservoirs or reservoirs which have been cleaned shall be disinfected prior to placing them into service.

(i) Samples for bacteriological examination shall be taken upon the initial approval of the physical structure based upon the requirements of this Part and when any repair or alteration of the water supply system has been made, and at least every three years; provided, that water supplies with buried well casing seals, installed prior to the adoption of this section, shall be tested at intervals no greater than six months apart. Whenever such samples indicate either the presence of bacteria of the coliform group, or whenever the well casing, pump or seal need replacing or repair, the well casing and seal shall be brought above the ground surface and shall comply with all other applicable construction criteria of this section; provided, that when water is hauled to the dairy farm, such water shall be sampled for bacteriological examination at the point of use and submitted to a laboratory each month. Bacteriological examinations shall be conducted in an officially designated laboratory.

(j) Current records of water tests shall be retained on file at the dairy farm.