PDFWAC 480-66-450
Privies.
(1) All privies must be located, constructed, and maintained to avoid contaminating any water of the state.
(2) A suitable approach, such as concrete, gravel or cinder walk must be provided.
(3) Privies must be constructed and maintained to be insect and rodent proof.
(4) Every privy must be provided with a door that is self-closing.
(5) The lids over the seats must be constructed to fall into a closed position when the seat is not occupied.
(6) The pit, or vault must be ventilated to the outside air by means of a stack protected at its outlet by screens.