Title 13 Public Utilities and Services
Chapter 13.03 Sewers
Article XI. Rates
Section 13.03.1136 “Standard Wastewater Strength”
- “Standard wastewater strength” or “standard strength sewage” means wastewater containing constituents typical of wastewater discharged from domestic dwelling units in the City of Spokane, specifically three hundred milligrams per liter (mg/l) of BOD, three hundred milligrams per liter SS, and five milligrams per liter P.
- Wastewater which is determined, by analysis of monitored sample, by the Wastewater Director to be within the range of one standard deviation on either side of the typical value:
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- BOD between two hundred and three hundred milligrams per liter,
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- SS between two hundred and three hundred milligrams per liter, and
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- P between four and six milligrams per liter,
and not containing other elements, materials or substances at concentration levels or amounts known to be detrimental to the structure or operation of the Spokane wastewater treatment system or hazardous to the health of municipal employees, and which will not cause the municipality to violate its National Pollutant Discharge Elimination System (NPDES) permit, will be considered as being of standard wastewater strength.
Date Passed: Monday, December 8, 2025
Effective Date: Sunday, January 18, 2026
ORD C36776 Section 72
