Spokane County adopted engineering design standards and stormwater BMPs as described within the Spokane Regional Stormwater Manual (SRSM). The SRSM was approved by the Board of County Commissioners on April 15, 2008, and became law on June 1, 2008, replacing the existing Spokane County - Guidelines for Stormwater Management. The SRSM is considered by the Department of Ecology to be an equivalent to the Stormwater Management Manual for Eastern Washington (SWMMEW).
The following chapters of the Spokane County Code address stormwater design, management, and maintenance requirements: 1) Chapter 9.14 – Roads Approach and Drainage in New Construction; 2) Chapter 12.400 – Subdivisions; and 3) Chapter 14.802.060 – Parking Lot Location and Design.
Spokane County Code, Title 8, Health and Sanitation Code, Chapter 8.03 – Sanitary Sewer, includes various sections that address illicit discharges within Spokane County. The primary relevant sections include: 8.03.1570 POTW; 8.03.1710 – Private Storm Sewer; 8.03.1730 – Prohibited Discharge Standards or Prohibited Discharges; 8.03.1750 – Public Sewer; 8.03.1830 – Sewer; 8.03.1990 – Stormwater; 8.03.2010 – Storm Sewer or Storm Drain; 8.03.3200 – Prohibited Uses of Sanitary Sewer; 8.03.3220 – Use of Storm Sewers--Combined Sewers--Natural Outlets; 8.03.3260 – Obstructing Sewer Prohibited; 8.03.3300 – Unauthorized Connection to Public Sewers; 8.03.3240 – Prohibited Uses--Public Sewers; 8.03.4040 – Prohibited Discharge Standards--General Prohibitions; 8.03.4060 – Prohibited Discharge Standards--Specific Prohibitions.
Spokane County Code, Title 8, Health and Sanitation Code, Chapter 8.26 – Litter and Discriminate Dumping, includes various sections that are relevant to protecting the integrity of stormwater and other surface waters, such as Section 8.26.020 – Litter in General, which addresses the disposal of litter upon any public place or private property, or within any waters in Spokane County. This Chapter also addresses notice of violation, enforcement, and penalty.
Spokane County Code, Chapter 8.60.030 – Oil Sellers--Educational Responsibilities, requires sellers of lubricating oil to do the following: 1) post educational materials that describe the importance of used oil recycling and how and where used oil may be recycled, and 2) provide for the sale of reusable used oil containers.
Spokane County implements flood controls through Title 3, Buildings and Structures, Chapter 3.20 – Flood Damage Protection. This is a comprehensive flood control ordinance that manages development within delineated floodplains in compliance with the National Flood Insurance Program.
2008 amendments to Spokane County Code, Chapter 9.14 – Roads, Approach and Drainage in New Construction, were developed and approved (Resolution No. 09-0672) to address illicit discharge regulations, including:
Prohibition of illicit discharges to the MS4
Spill Control, dumping, and disposal of materials other than stormwater to the MS4
Compliance with conditions in ordinances related to stormwater discharges
Inspection and monitoring procedures necessary to determine compliance and enforce the prohibition of illicit discharges to the MS4
In 2013, the Eastern Washington Low Impact Development (LID) Guidance Manual was developed as a supplemental guidance for the design, construction, and maintenance of LID stormwater Best Management Practices (BMPs). This manual was a regional effort led by the County in conjunction with many Eastern Washington municipalities, including the Washington Stormwater Center, Ecology, and regional LID experts.