(1)
Except as provided in Section 7.7. and Sentences (2) and (3), water distribution systems shall be connected to a public water main, drinking water system or a potable private water supply system.
(2)
Storm sewage or greywater that is free of solids and treated to conform to Article 7.7.4.1. is permitted to be used as a water supply for
(a)
water closets,
(b)
urinals,
(c)
sub-surface irrigation, or
(d)
the priming of traps.
(3)
Rainwater that is free of solids and treated to conform to Article 7.7.4.1. is permitted to be used as a water supply for
(a)
clothes washers,
(b)
laundry trays,
(c)
mop sinks,
(d)
bedpan washers,
(e)
water closets,
(f)
urinals,
(g)
hose bibbs,
(h)
sub-surface irrigation, or
(i)
the priming of traps.
(4)
Piping conveying the non- potable water described in Sentence (2) shall be installed in conformance with Section 7.7.