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3/9/2018
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Municipal Stormwater Phase I and Western WA Phase II Permit Overview
Emma TrewhittWater Quality Division
Municipal Stormwater Permits implement Federal and State rules
• Federal Clean Water Act• State Water Pollution Control Act
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MS4
• Municipal• Separate• Storm• Sewer• System
So, what is regulated?
• Stormwater Discharges from the MS4• MS4 Conveyance systems include: Roads with drainage systems Municipal streets Catch basins Curbs and gutters Ditches and other man-made channels Storm drains
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Phase I- largest cities and countiesPhase II- smaller urban areas
Area Covered
• Ph I– Entire unincorporated area of
Counties– Area within cities
• Ph II– Census Defined urban areas
within Counties and associated urban growth areas
– Area within cities
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Municipal Stormwater Permits
Phase I (Issued 1995,
reissued 2007, 2012)
King, Snohomish, Pierce & Clark counties; Seattle & Tacoma
Western WA Phase II (Issued 2007, reissued 2012)
80 cities and parts of 5 counties
Eastern WA Phase II(Issued 2007,reissued 2012)
18 cities and parts of 6 counties
All three permits include Secondary
Permittees
46 Secondaries – Ports, Schools, Irrigation Districts, etc.
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Mapping
Public Education and Outreach
Public Involvement
Illicit Discharge Detection and Elimination
Controlling Runoff from New Development
Operations and Maintenance
Monitoring
Source Control
Structural controls
Compliance with TMDLs
Permit Requirements
Phase I Only *
Mapping
• Documenting the MS4– Outfalls– Receiving waters– Stormwater Facilities– Connections between Permittee owned and operated MS4, and other municipalities or other public entities
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Public Involvement
• Ensures that the public can have an active role in shaping their local stormwater programs.
Education and Outreach
• Should be designed to educate target audiences about a specific stormwater problem, and address specific actions the public can take.
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Illicit Discharges
• Eliminates illegal connections to stormwater systems & helps with reacting to spills into the storm system. • Staff training
– Screen, Detect & Identify
• Report
Controlling Runoff
• Preventing impacts from runoff from new development, redevelopment and construction sites
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Operation and Maintenance
• Work to maintaining existingstormwater facilities so that thecontinue to function properly.
Monitoring and Assessment
• Important to figure out what’s working, and what’s not.
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Source Control
• Currently Phase I only. Prevents pollution from coming in contact with stormwater through inspection of commercial and industrial sites.
Structural Stormwater Controls
• Phase I only. Emphasizes retrofitting stormwater facilities to fix the stormwater pollution problems we have already created.
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TMDLs
• Special requirements for MS4 discharges to an EPA approved TMDL
ECOLOGY’S FAQ WEBSITE
https://ecology.wa.gov/
Search ‘Stormwater FAQ’
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Current Permit Extended Through 2019
• More time for public input • Finalize proposed changes
Permit Reissuance• Proposed Changes
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Both Permits
• Long-term MS4 planning• IDDE reporting
– Uploading IDDE data for consistency and comparability
• Mapping• Education and Outreach
– Maintaining and refining requirements– Aligning both Ph I and Ph II
Differences
• Phase I– Structural Stormwater Controls
• ‘Retrofit incentive points’ to define a level of effort
• WW Phase II– Source Control
• Following Ph I requirements
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More information..
• https://ecology.wa.gov/Regulations-Permits/Permits-certifications/Stormwater-general-permits/Municipal-stormwater-general-permits
• Lists all draft sections currently available
Timeline and Next Steps
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Early Input Public Meetings
Preliminary Draft
Sections
Preliminary Draft
Comment Period
Final Draft (Aug. 2018)
Comment Period
Final Permit
We are here
TIMELINE
Next Steps
• Reviewing comments from preliminary draft comment period
• Formal Draft released this summer– 90 day comment period
• Permit issuance summer of 2019
