This Article 12C shall apply to the installation and operation of the Alternate Water Source systems at Large Development Projects, and to the voluntary installation and operation of the Alternate Water Source systems at sites containing multi-family and non-residential buildings. This Article does not apply to:
(a) Systems at small residential occupancies.
(b) Graywater systems where Graywater is collected solely for subsurface irrigation and does not require disinfection, as determined by the Director.
(c) Rainwater systems where Rainwater is collected solely for subsurface irrigation, drip irrigation, or non-sprinkled surface applications and does not require disinfection, as determined by the Director.