Sewer Planning & Design

The Sewer Planning & Design section oversees and regulates the installation of all sewers which connect or discharge to the County's Regional Sewer System. The ongoing goal of the sewer program is the prevention and elimination of septic tanks above the Spokane Valley-Rathdrum Prairie Aquifer, Spokane's sole source potable water supply.

Planning & Design Documents

• Comprehensive Wastewater Management Plan (CWMP)
• 2023-2028 Six-Year Sewer Construction Capital Improvement Program (CIP)
• Washington State Growth Management Act 
• Spokane County Standards for Road and Sewer Construction
  • Construction Certification Procedures (Technical Reference C)
  • Side Sewer Installation Handbook (Technical Reference E)
  • Sanitary Sewer Standards Manual (Chapter 11)
• Sanitary Sewer Code (effective 2-1-22)
• Sanitary Sewer Code (effective 3-1-23)
• Short Form Survey of Nonresidential Establishments
• Sewer Planning Requirements Form for Planned Action Ordinance Applications
• Mead-Mt. Spokane Pump Station and Pipeline Project
  • Little Spokane Drive Sewer Extension & Inverted Siphon
  • Mead-Mt. Spokane Sewer Extension Project
  • Determination of Non-Significance and Environmental Checklist

Sewer Maps

Notice: These maps are not legal documents. Data depicted on these maps is general and schematic in nature. Please contact Environmental Services if you need specific information regarding the County's sewer system.

• North Spokane Sewers
• Spokane Valley Sewers

Other Agencies

• Washington State Department of Ecology
• Washington State Department of Health

Certified Bid Tabs 

• Peone Pines Connection
• Barker Road Homes