Permit Guidance and Data

Guidance | Tools | Permit Application Forms | Data

This page contains links to information on the Wastewater Discharge Permit program, guidance documents, permit applications, and tools used by Ecology permit writers in developing wastewater discharge permits.

Guidance

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Tools

Spreadsheets for Water Quality-Based NPDES Permit Calculations
Spreadsheets used by Ecology permit writers for calculating water quality criteria, determining reasonable potential and developing effluent limits.

Data

The "Water Quality Life Cycle System" (WPLCS) Database
Wastewater and Stormwater Permit data availability.

Wastewater Permits 101 - An Introduction to Wastewater Permits (Presentation Slides)

Guidelines for Preparation of Engineering Reports for Industrial Wastewater Land Application Systems

Guidance on the form and content of an engineering report for land application of industrial wastewater.

Guidance on Land Treatment of Nutrients in Wastewater, with Emphasis on Nitrogen

Fact Sheet - Guidance on Land Treatment of Nutrients

Provides background for the "Guidance on Land Treatment of Nutrients in Wastewater, with Emphasis on Nitrogen".

Water Reclamation and Reuse Standards

Design standards for the use of adequately and reliably treated wastewater in place of drinking water for non-potable uses.

Guidance for Conducting a Mixing Zone Analysis

Ecology’s requirements for determining dilution factors for wastewater discharges.

Municipal Land Treatment Design

The goal of this document is to protect the public health and prevent any unnecessary exposure to the public from land-applied wastewater. The criteria reflect a managed plan that is incorporated into engineering documents submitted for approval to Ecology and the Department of Health.

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