NAC445A.6692. Water wells: Access port or sounding tube; vent.

     1. Except as otherwise provided in subsection 2, a water well must have an access port which can be used for measuring the level of water. If the diameter of the casing is:

     (a) No greater than 8 5/8 inches, the access port must:

          (1) Be 1 inch in diameter and located at the top or in the cover of the casing; and

          (2) Have a removable plug or bolt installed in such a manner as to prevent pollutants and contaminants from entering the well.

     (b) Greater than 8 5/8 inches, the access port must:

          (1) Be 2 inches in diameter and located near the top of the casing; and

          (2) Have a watertight, screw-type cap which is:

               (I) Sealed in such a manner as to prevent pollutants and contaminants from entering the well; and

               (II) Kept sealed when not being used for measuring the level of water.

     2. If the diameter of the casing of a water well is greater than 8 5/8 inches, the well may be equipped with a sounding tube, in lieu of an access port, which is:

     (a) Not less than 3/4 inch nor more than 1 inch in diameter; and

     (b) Installed in such a manner as to:

          (1) Preclude the entanglement of the sounder around the drop pipe or in the wires of any submersible pump; and

          (2) Prevent any interference with cascading water.

     3. A water well must be equipped with:

     (a) A vent that:

          (1) Extends above the wellhead;

          (2) Is elbowed toward the ground in the shape of an inverted “J”; and

          (3) Is covered with a screen that is not susceptible to damage by corrosion and has not less than 22 nor more than 24 mesh per inch; or

     (b) An air and vacuum valve that is attached to discharge piping.

     (Added to NAC by Bd. of Health, eff. 2-20-97)