(1) Only a person approved by the local health officer to install greywater irrigation systems may construct and install a Tier 2 or Tier 3 system.

(2) The local health officer may allow the resident owner of a single-family residence, not adjacent to a marine shoreline, to install the Tier 2 or Tier 3 system for his or her residence when the system reuses no more than three hundred gallons per day of greywater.

(3) The installer shall:

(a) Follow the approved design;

(b) Have the approved design in possession during installation;

(c) Make no changes to the approved design without the prior authorization of the person who designed the system and, if a permit is required, the local health officer; and

(d) Be on the site at all times during the excavation and construction of the system.