The environmental regulations that are administered by Clean Water Services are detailed in Chapter 3 of the Design and Construction Standards (PDF). These rules apply throughout unincorporated urban Washington County, its cities, and small portions of unincorporated Clackamas and Multnomah counties.
The goal of the Environmental Review is to obtain the Service Provider Letter (SPL), which will lead to site development, erosion control, or building permits. The Environmental Review includes a Sensitive Area prescreening process and, based on the results of this process, a Site Certification or Standard Site Assessment may be required.
More detailed information is available in our Environmental Review Process for a Service Provider Letter (PDF).
Sensitive Area Prescreening Requirements
- Site plan (if applicable)
- Prescreen Application Form
Site Certification Requirements
- Sensitive Areas Certification Form (PDF)
- Site plan
- Photos of the site/project area with photo locations on the site plan
- Service Provider Letter Fee*
- Vegetated Corridor Planting Table
*Check the current Review and Inspection Fees. Still have questions? Call our Permit Counter at 503.681.5100.
Site Assessment Requirements
- Sensitive Areas Certification Form (PDF)
- Submittal Fee*
- Delineation report
- Natural resource assessment report
- Existing condition figure
- Proposed development figure
- Service Provider Letter Fee* (dependent on the amount of encroachment, if any, into the Vegetated Corridor)
Amendment of Existing SPL Requirements
- Service Provider Letter Amendment Request (PDF)
- Memorandum detailing project modifications and how they continue to meet Chapter 3 standards.
- Updated figures illustrating the changes with Vegetated Corridor and Sensitive Areas included.
- Amendment Fee* (dependent on number of amendment requests made and encroachment amount)
*Check the current Review and Inspection Fees. Still have questions? Call our Permit Counter at 503.681.5100.