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.