|(a) Non-toxic and sound materials. Lagoons and all
appurtenances shall be constructed of materials that:
(1) are nontoxic to humans and the environment;
(2) are impervious and enduring;
(3) will withstand design stresses; and
(4) will provide a watertight structure with a smooth,
easily cleanable surface without cracks or joints that are not watertight
and easily cleanable.
(b) NSF 50. For lagoons constructed on or after the
effective date of this subchapter, pumps, filters, skimmers, chemical
feeders, and other equipment that falls within NSF/ANSI Standard 50
shall meet the standard as confirmed by a testing laboratory. Conformity
with the NSF 50 shall be evidenced by the listing or labeling of such
equipment by such a laboratory or by separate documentation.
(c) Prohibition of earth material.
(1) Earth shall not be permitted as an interior finish
in the lagoon. Clean sand or similar material if used in a beach environment:
(A) shall only be used over an impervious surface;
(B) shall be designed to perform in such an environment;
(C) shall be controlled so as not to adversely affect
the proper circulation, filtration, treatment system, maintenance,
safety, sanitation, and operation of the lagoon.
(2) If sand or similar material is used in the lagoon,
positive upflow circulation through the sand or other systems shall
be provided as necessary to ensure that sanitary conditions are maintained
at all times.
(d) Interior color. The color of the interior of the
lagoon shall be white or a light enough color so that objects and
users in the water shall be easily seen. The finish shall be at least
6.5 on the Munsell color value scale. An eight-inch black disk or
a Secchi disk at the deepest point of the floor in a swimming area
of the lagoon shall be clearly and immediately seen by an observer.
(e) Materials to withstand freezing temperatures. The
lagoon liner or shell and appurtenances, piping, filter system, pump
and motor, and other components shall be designed and constructed
to facilitate protection from damage due to freezing.
(f) Surface water. The lagoon shall be designed such
that surface water does not enter the lagoon.
(g) Interior surface footing. The surfaces within the
lagoon intended to provide footing for users shall be slip-resistant
to help reduce the chance for a fall. The roughness or irregularity
of such surfaces shall not cause injury to feet during normal use.
(h) General shape. This subchapter is not intended
to regulate the perimeter shape of the lagoon. It is the responsibility
of the licensed engineer to take into account the effect a given shape
of the lagoon will have on the health and safety of the users.
(i) Entanglement or entrapment avoidance. There shall
be no protrusions, extensions, means of entanglement, or other obstructions
in the lagoon that are likely to cause entrapment or injury of the
(j) Maximum users in swimming areas. Maximum user loading
in a swimming area shall comply with the following:
(1) In an area of water depth 4 feet or less, the user
load shall not exceed one user per 15 square feet of water surface.
(2) In an area of water depth greater than 4 feet,
the user load shall not exceed one user per 25 square feet of water
(3) The owner or operator shall be responsible for
restricting usage so that the maximum capacity is not exceeded.
(k) Maximum users in non-swimming areas. The owner
or operator shall determine the maximum user loading in a non-swimming
area by considering the type of use in the non-swimming area and the
presence of motorboats and vessels and shall post signs indicating
the maximum number of users.
(l) Floor slopes. For the lagoon constructed on or
after the effective date of this subchapter, floor slope in a swimming
area shall comply with the following:
(1) For depths up to five feet, the slope shall be
uniform and not exceed 1:10.
(2) For depths over five feet, the slope shall be uniform
and not exceed 1:3.
(3) The slope may vary in limited areas where access
for persons with disabilities has been provided.
(m) Underwater seat benches. An underwater seat bench
(1) be constructed with slip-resistant materials;
(2) have a maximum seating width of 18 inches projecting
from the wall at a depth not to exceed 20 inches below the design
(3) be located fully outside of the required minimum
diving water envelope if the lagoon is used for diving;
(4) be visually set apart and provided with a solid
or broken stripe at least 1-inch wide on the top surface along the
front leading edge of the bench; and
(A) the stripe shall be plainly visible to persons
on the ground above the bench; and
(B) the stripe shall be a contrasting color to the
background on which it is applied, and the color shall be permanent;
(5) not be used as a required entry or exit access
unless used in conjunction with steps.
(n) Water lounges. A water lounge shall:
(1) be a minimum of 20 inches wide and provide a minimum
of 10 square feet of horizontal surface adjoining on the edge of the
lagoon over a distance of not less than 3 feet;
(2) be horizontal and at a depth of 2 inches to 10
inches below the water surface;
(3) be visually set apart with a horizontal solid or
broken stripe at least 1-inch wide on the top surface along the leading
edge of horizontal surfaces of all edges not adjoining the lagoon
(A) the stripe shall be plainly visible to persons
on the deck; and
(B) the stripe shall be contrasting color to the background
on which it is applied, and the color shall be permanent;
(4) be located fully outside of the required minimum
diving water envelope if the lagoon is intended for use with diving
(5) have a slip-resistant surface; and
(6) be located in water depth of 4 feet or less.
(o) Construction tolerances. For lagoons constructed
on or after the effective date of this subchapter, construction tolerances
shall be in accordance with the construction plan submitted by the