Engineering Guidance

Washington State Department of Ecology

Engineering Guidance

In accordance with RCW 90.48.112, opportunities for reclaimed water use must be considered in engineering submittals to the Department of Ecology. The Water Reclamation and Reuse Standards also require that an engineering report be submitted for review and approval of all water reclamation facilities. This is usually included as part of the facilities plan. The following documents provide guidance in preparing these reports.

Consideration of Reclaimed Water Within General Sewer Plans
Ecology Criteria for Sewage Works Design (Orange Book)
Ecology Criteria for Sewage Works Design, Chapter E1: Reclaimed Water
Facility Plan Reliability Assessment Guidance and Checklist
Design Criteria For Municipal Wastewater Land Treatment Systems for Public Health Protection
Guidelines for Preparation of Engineering Reports for Industrial Wastewater Land Application Systems
Pipeline Separation Design and Installation Reference Guide

Department of Health (DOH) Technology Guidance Documents:

Wastewater
Drinking Water