Skip to main content
- Description
- Adds 30.61.122, 30.63A.010 – 30.63A.040, 30.63A.100 – 30.63A.170, 30.63A.200, 30.63A.220, 30.63A.300, 30.63A.310, 30.63A.400 – 30.63A.17605, 30.63A.700 – 30.63A.750, 30.63A.800 – 30.63A.870, 30.63A.900 – 30.63A.940, 30.91B.080, 30.91C.066, 30.91C.112, 30.91C.298, 30.91D.287, 30.91E.158, 30.91F.225, 30.91F.522, 30.91I.010, 30.91L.025, 30.91L.215, 30.91M.011, 30.91M.225, 30.91N.012, 30.91N.044, 30.91P.256, 30.91P.257, 30.91P.258, 30.91P.354, 30.91R.027.1, 30.91R.121, 30.91R.170, 30.91R.252, 30.91S.351, 30.91S.450, 30.91S.521, 30.91D.596 – 30.91S.598, 30.91S.637, 30.91T.005, 30.91T.054B, 30.91T.054.2, 30.91W.021 and 30.91W.025; amends 30.23.110, 30.23A.080, 30.25.015, 30.25.023, 30.28A.110, 30.28A.150, 30.32C.150, 30.41C.090, 30.4B.115, 30.62A.320, 30.62A.340, 30.91C.112, 30.91D.180, 30.91D.370, 30.91D.400, 30.91E.070, 30.91P.330 and 30.91R.070; repeals 30.32B.230, 30.63A.010 – 30.63A.440, 30.91D.420 and 30.91D.430, unified development code
- Disposition
-
Codified
- Adoption Date
- 6/9/2010
- Effective From
- 9/30/2010
- Files Available
- Affecting
-
30.23.110, Special setbacks for certain uses
(Amended)
-
30.23A.080, On-site recreation space
(Amended)
-
30.25.023, Stormwater flow control or treatment facility landscaping
(Amended)
-
30.28A.110, Site selection criteria
(Amended)
-
30.61.122, State Environmental Policy Act (SEPA) requirements relating to stormwater management
(Added)
-
30.62A.320, Standards and requirements for buffers and impervious surfaces
(Amended)
-
30.62A.340, Standards and requirements for activities conducted in wetlands
(Amended)
-
30.63A.010, Purpose and objectives
(Added)
-
30.63A.020, Applicability
(Added)
-
30.63A.030, Compliance with other laws
(Added)
-
30.63A.040, Projects performed under authority of the director of public works or county engineer and projects performed by surface water management
(Added)
-
30.63A.100, Snohomish County stormwater regulations
(Added)
-
30.63A.110, Snohomish County Drainage Manual
(Added)
-
30.63A.120, Engineering Design and Development Standards
(Added)
-
30.63A.140, Washington State Department of Transportation Highway Runoff Manual
(Added)
-
30.63A.150, Hierarchy of regulations
(Added)
-
30.63A.160, Hierarchy of definitions
(Added)
-
30.63A.170, Modification and waiver criteria and processes
(Added)
-
30.63A.200, General exemptions
(Added)
-
30.63A.220, Exemption for county projects
(Added)
-
30.63A.300, Drainage review thresholds and requirements for new development
(Added)
-
30.63A.310, Minimum drainage review thresholds and requirements for redevelopment
(Added)
-
30.63A.400, Minimum requirement 1: Preparation of a stormwater site plan
(Added)
-
30.63A.445, Minimum requirement 2: Stormwater pollution prevention plan (SWPPP) - objectives and applicability
(Added)
-
30.63A.450, Minimum requirement 2: SWPPP - general requirements
(Added)
-
30.63A.515, Minimum requirement 3: Water pollution source control for new development or redevelopment
(Added)
-
30.63A.520, Minimum requirement 4: Preservation of natural drainage systems and outfalls, and provision of off-site mitigation
(Added)
-
30.63A.525, Minimum requirement 5: On-site stormwater management
(Added)
-
30.63A.530, Minimum requirement 6: Runoff treatment - requirements
(Added)
-
30.63A.550, Minimum requirement 7: Flow control requirements for new development or redevelopment
(Added)
-
30.63A.570, Minimum requirement 8: Stormwater discharges to wetlands
(Added)
-
30.63A.575, Minimum requirement 9: Inspection, operation and maintenance requirements
(Added)
-
30.63A.580, Minimum requirement 9: Interim maintenance responsibility for facilities and BMPs in the county right-of-way after construction acceptance
(Added)
-
30.63A.585, Minimum requirement 9: Release of owner and applicant from maintenance responsibility for certain facilities and BMPs
(Added)
-
30.63A.590, Minimum requirement 9: Easements granted to the county
(Added)
-
30.63A.595, Minimum requirement 9: Private easements
(Added)
-
30.63A.605, Minimum requirement 9: Separate tracts or easements
(Added)
-
30.63A.700, Minimum requirements for pavement maintenance
(Added)
-
30.63A.710, Separation requirements for drainage facilities
(Added)
-
30.63A.720, Access to flow control and treatment facilities
(Added)
-
30.63A.730, Conveyance systems - minimum standards
(Added)
-
30.63A.740, Stormwater plan conveyance system and stub out requirements for new development or redevelopment activities, subject to full drainage plan
(Added)
-
30.63A.800, Stormwater drainage review process
(Added)
-
30.63A.805, Targeted stormwater site plan submittal requirements
(Added)
-
30.63A.810, Stormwater pollution prevention plans for small projects
(Added)
-
30.63A.815, Full stormwater site plan submittal requirements
(Added)
-
30.63A.820, Phased submittal of full stormwater site plans
(Added)
-
30.63A.825, Stormwater site plan revisions
(Added)
-
30.63A.830, Modifications
(Added)
-
30.63A.835, Reconsideration of a modification decision
(Added)
-
30.63A.840, Waivers
(Added)
-
30.63A.842, Reconsideration of a waiver decision
(Added)
-
30.63A.845, Authority to require more stringent standards and requirements and to impose mitigation
(Added)
-
30.63A.850, Compliance with permits and stormwater site plans
(Added)
-
30.63A.855, Replacement of individuals reviewing or inspecting work
(Added)
-
30.63A.860, Drainage inspection process
(Added)
-
30.63A.865, Submittal of record drawings
(Added)
-
30.63A.870, Process for construction acceptance
(Added)
-
30.63A.900, Drainage security devices and insurance - general
(Added)
-
30.63A.940, Drainage insurance requirements
(Added)
-
30.91B.080, Best management practices or BMPs
(Amended)
-
30.91C.066, Certified Erosion and Sediment Control Lead or CESCL
(Added)
-
30.91C.112, Clearing
(Amended)
-
30.91C.185, Common plan of development or sale
(Added)
-
30.91C.298, Converted pervious surfaces
(Added)
-
30.91D.287, Discharge
(Added)
-
30.91D.370, Drainage facility
(Amended)
-
30.91D.400, Drainage manual or Snohomish County drainage manual
(Amended)
-
30.91E.070, Effective impervious surface
(Amended)
-
30.91E.158, Erosion hazard
(Added)
-
30.91F.225, Final Stabilization
(Added)
-
30.91F.522, Full stormwater site plan
(Added)
-
30.91I.010, Impervious surface
(Amended)
-
30.91L.025, Land disturbing activity
(Added)
-
30.91L.215, Low impact development or "LID"
(Amended)
-
30.91M.011, Maintenance
(Added)
-
30.91M.225, Municipal separate storm sewer system
(Added)
-
30.91N.012, Native vegetation
(Added)
-
30.91N.044, New development
(Added)
-
30.91P.256, Pollution-generating impervious surface or PGIS
(Added)
-
30.91P.257, Pollution-generating pervious surfaces or PGPS
(Added)
-
30.91P.258, Pre-developed condition
(Added)
-
30.91P.330, Professional inspection
(Amended)
-
30.91P.354, Project site
(Added)
-
30.91R.027.1, Receiving waters
(Added)
-
30.91R.070, Redevelopment
(Amended)
-
30.91R.170, Retention facility
(Amended)
-
30.91R.252, Runoff
(Added)
-
30.91S.351, Site
(Added)
-
30.91S.450, Snohomish County drainage manual or drainage manual
(Added)
-
30.91S.521, Source control BMP
(Added)
-
30.91S.596, Stormwater facility
(Added)
-
30.91S.597, Stormwater flow control facility
(Added)
-
30.91S.598, Stormwater pollution prevention plan or SWPPP
(Added)
-
30.91S.637, Strahler stream order
(Added)
-
30.91T.005, Targeted stormwater site plan
(Added)
-
30.91T.054B, Threshold discharge area
(Added)
-
30.91T.054.2, Timber
(Added)
-
30.91W.021, Water quality
(Added)
-
30.91W.025, Waters of the state
(Added)
- Previously Affecting
-
30.63A.405, Minimum requirement 1: Stormwater site planning process
(Added)
-
30.63A.410, Minimum requirement 1: Stormwater site planning process step 1
(Added)
-
30.63A.415, Minimum requirement 1: Stormwater site planning process step 2
(Added)
-
30.63A.420, Minimum requirement 1: Stormwater site planning process step 3
(Added)
-
30.63A.425, Minimum requirement 1: Stormwater site planning process step 4
(Added)
-
30.63A.430, Minimum requirement 1: Stormwater site planning process step 5
(Added)
-
30.63A.435, Minimum requirement 1: Stormwater site planning process step 6
(Added)
-
30.63A.440, Minimum requirement 1: Stormwater site planning process step 7
(Added)
-
30.63A.455, SWPPP element 1: Preserve vegetation and marking clearing limits
(Added)
-
30.63A.460, SWPPP element 2: Establish construction access
(Added)
-
30.63A.465, SWPPP element 3: Control flow rates
(Added)
-
30.63A.470, SWPPP element 4: Install sediment controls
(Added)
-
30.63A.475, SWPPP element 5: Stabilize soils
(Added)
-
30.63A.480, SWPPP element 6: Protect slopes
(Added)
-
30.63A.485, SWPPP element 7: Protect permanent drain inlets
(Added)
-
30.63A.490, SWPPP element 8: Stabilize channels and outlets
(Added)
-
30.63A.495, SWPPP element 9: Control pollutants
(Added)
-
30.63A.500, SWPPP element 10: Control de-watering
(Added)
-
30.63A.505, SWPPP element 11: Maintain BMPs
(Added)
-
30.63A.510, SWPPP element 12: Manage the project
(Added)
-
30.63A.535, Minimum requirement 6: Treatment facility selection, design and maintenance
(Added)
-
30.63A.540, Minimum requirement 6: Water quality design flow rate
(Added)
-
30.63A.545, Minimum requirement 6: Stormwater discharge from PGIS
(Added)
-
30.63A.555, Minimum requirement 7: Flow control thresholds
(Added)
-
30.63A.560, Minimum requirement 7: Flow control design - parking lots
(Added)
-
30.63A.750, Tightline systems required in the Lake Stevens Urban Growth Area
(Added)
-
30.91R.121, Replaced impervious surface
(Added)