Water quality individual permit guidance

This page contains links to guidance documents and tools used by our permit writers and permittees.

Wastewater discharge permit guidance

Permit Writer's Manual

The Permit Writer’s Manual (Ecology Publication Number 92-109) is meant to guide permit writers and the public through our process of developing and issuing wastewater discharge permits.

Surface water discharge guidance

Quality Assurance Project Plans (QAPPs) ensure systematic data collection that meets our standards and provides credible environmental data.

Groundwater or land treatment guidance

Land treatment uses crops as part of the wastewater treatment process — as opposed to land application — which is disposal.

Other topics

Pretreatment Tools