Services Departments Government

Erosion Prevention and Sediment Control

Upcoming dates for erosion control training. These trainings meet the requirements of the ODEQ 1200C and CN permits.

Development activity can remove soil cover and increase the site’s susceptibility to erosion.  This erosion, and the pollutants that can come from construction debris, can have an adverse impact on adjoining properties, the pubic storm drainage system and the health of our local streams.  With the proper use of erosion prevention and sediment control (EPSC) measures, movement of pollutants and soil off of the site can be prevented and minimized

All development related activity within WES service districts is required to provide erosion prevention and sediment control (EPSC) measures as applicable. Sites which disturb 800 square feet or more are required to obtain Erosion Prevention and Sediment Control permit from WES. Also, all development activity within Clackamas County which disturbs 1-acre or greater is required to obtain a Department of Environmental Quality (DEQ) 1200-C Construction Stormwater (Erosion Control) Permit or a 1200-CN Permit.

Types of Erosion Prevention and Sediment Control Permits

Depending on the location, type and size of the development project, different EPSC permits and plans may be needed. The table below is a guide to help determine what is required.  Following the table are descriptions of each of the permit types

Disturbance Area Permit Type(s) Needed
Gladstone, Rivergrove, and WES service districts: SWMACC & CCSD#1
(excluding Happy Valley)
800 sq. ft. to less than 1 acre of disturbance (thru all phases)
  • WES EPSC Permit
1 acre to less than 5 of disturbance
(thru all phases)
  • WES EPSC Permit
  • 1200-CN permit granted through WES, (automatically granted as part of the WES EPSC Permit)
5 acres or more of disturbance
(thru all phases)
  • WES EPSC Permit
  • 1200-C permit through DEQ
All other areas in  Clackamas County
1 acre or more of disturbance
(thru all phases)
  • 1200-C permit from DEQ

    (Check with DEQ)

WES Erosion Prevention and Sediment Control Permit

WES EPSC Permit is required if the development activity disturbs 800-sq. ft. or more. In order to obtain a WES EPSC Permit, please complete the WES EPSC Permit Application and plans as specified in the application. Typically this permit is issued for residential construction and small commercial/industrial additions and improvements.

Erosion Control 1200-CN Permit

For those sites that are 1 acre to less than 5 acres of disturbance and are located inside of Gladstone, Rivergrove, SWMACC or CCSD#1 (excluding the City of Happy Valley), a Department of Environmental Quality (DEQ) 1200-CN Construction Stormwater (Erosion Control) Permit will be issued by WES along with the WES EPSC permit. To obtain a 1200-CN permit the applicants must submit the required WES EPSC Permit application and 1200-CN template style erosion control plans to WES for review and approval. Click on You can download the WES EPSC Application or 1200-CN Templates to download from our website. Typically the 1200-CN permit is issued for small subdivisions, partitions, multi-family, commercial and industrial projects.

Erosion Control 1200-C Permit

For those sites that are 5 acres or more of disturbance within CCSD#1, SWMACC or Gladstone, or are 1 acre or more of disturbance outside of CCSD#1, SWMACC or Gladstone, a Department of Environmental Quality (DEQ) 1200-C Construction Stormwater (Erosion Control) Permit is required. To obtain a 1200-C permit the applicant must submit the required 1200-C application and template style erosion control plans to DEQ for review and approval. The DEQ 1200-C Templates are available from DEQ's 1200-C Construction Stormwater General Permit webpage. Typically the 1200-C permit is issued for large subdivisions, multi-family, commercial and industrial projects.

Erosion Control Resources

Erosion Prevention and Sediment Control Planning and Design Manual

The purpose of the Erosion Prevention and Sediment Control Planning and Design Manual is to provide a comprehensive and detailed approach towards controlling erosion on construction sites. It includes information regarding materials and installation practices. This manual was created in partnership with the cities of Gladstone, Happy Valley, Lake Oswego, Milwaukie, Oregon City, West Linn, Wilsonville and Oak Lodge Sanitary District and Clean Water Services.

Erosion Prevention and Sediment Control Training

Training in proper selection, installation and maintenance of EPSC measures is available from private sources.  While WES does not approve or recommend any private training companies, the banner at the top of this page has training opportunities that WES has been notified of. 

Erosion Control Inspections

An Initial Erosion Control inspection is required as part of the construction of a single family home, and shall be completed and approved prior to the contractor pouring the foundation or footings. All non-single family projects such as a commercial, industrial or multi-family shall have the Initial inspection completed and approved prior to any soil disturbance except for the installation of erosion control devices.  Permittees must call WES to schedule the Initial Inspection.  Monitoring inspections will occur periodically throughout the construction. A Final Erosion Control inspection must be requested by the permittee once the site has been permanently stabilized.

Erosion Control Vendors and Plant Resources Vendors list

Water Environment Services

Development Services Building

Water Environment Services

Phone number 503-742-4567
Email wescustomerservice@clackamas.us
Address 150 Beavercreek Road
Oregon City, OR 97045
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Hours Monday to Thursday
7:30 a.m. to 5:30 p.m.

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