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Drainage System Information & Inspections
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Pollution Control Inspections
Stormwater Pollution Prevention Requirements
To keep pollutants from entering storm drains and reaching local waters, the City of Seattle requires businesses that connect to the city stormwater system to take steps to control pollution, as follows:
For all existing businesses
- • Maintain drainage control systems such as conveyance systems, detention systems and treatment systems
- • Maintain streets, driveways, parking lots and sidewalks
- • Identify and eliminate illegal connections to the drainage control system
For existing businesses performing high-risk pollution generating activities
- • Develop and implement spill prevention plans and procedures for prevention and immediate containment of spills.
- • Implement operational source controls (management practices that prevent or reduce the amount of pollutants in stormwater runoff), such as:
- • Training employees about stormwater pollution prevention practices
- • Proper containment for material storage
- • Coverage for materials that might erode or leach offsite
See 8 High-Risk Pollution Generating Activities (link at right) for the types of businesses that must adopt operational source controls.
See the Seattle Source Control Technical Requirements Manual (link at right) for details on operational source controls.
For new development of high-risk pollution generating activities (except normal residential activities)
- • Install structural source controls to the maximum extent practicable to the portion of the site being developed. Structural source controls are structural or mechanical devices or facilities that:
- • Enclose, cover, or contain the high-risk pollution generating activities
- • Collect drainage from a containment area for appropriate disposal or treatment
- • Prevent unpolluted stormwater from entering an area where pollution-generating activities take place (for example, by constructing berms, curbs, or dikes)
See 8 High-Risk Pollution Generating Activities (link at right) for the types of businesses that must install structural source controls as part of any new development.
See the Seattle Source Control Technical Requirements Manual (link at right) for details on structural source controls.
Related Links
To help businesses keep their drainage systems in good repair, the City also conducts Maintenance Inspections.
Links to Other Sites
Resource Venture - Stormwater Pollution Prevention Publications.
Seattle Source Control Technical Requirements Manual (PDF) - Describes City of Seattle requirements for operational and structural source controls to reduce stormwater pollution.
Seattle Department of Planning and Development
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