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The City of Portland, Oregon

Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

1120 SW 5th Ave, Suite 613, Portland, OR 97204

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Proposed rules governing System Development Charges

Environmental Services is updating the administrative rule governing System Development Charges. The current rule has not been substantively updated in more than 15 years. Updates to the rule were made in 2019 as part of a larger update related to administrative review. Over the past 15 years, there have been significant changes in the types of development subject to sewer and stormwater SDCs. This update seeks to create clarity and consistency for City staff and the community by formalizing and updating the SDC methodology and eliminating obsolete information.

The proposed rule revision:

  • Seeks to make the current rules relating to the application of the development-related sewer SDC calculation methodology consistent with staff practice.
  • Advances Environmental Services goals to improve business systems and strengthen community relations by clarifying how sanitary sewer and stormwater SDCs are calculated to ensure consistent and equitable application to development.
  • Ensures consistency between the written rules and implementation of the rules, promoting transparency and clarity, and potentially reducing requests for Administrative Review.

The most significant elements of the proposal include specifying Equivalent Dwelling Units (EDUs) and Plumbing Fixture Units (PFUs) per EDU for several residential and nonresidential occupancy types. The goal of the proposed revisions is to ensure consistent sewer and stormwater SDC calculations for certain development not previously addressed in rule.

How can I learn more?

The proposed ENB-4.05 rule and a fact sheet summarizing the changes are below.

Public hearing cancelled

Environmental Services received no requests for a public hearing, so the hearing has been cancelled. 

Public comment period is closed

Environmental Services accepted public comment on the proposed rule from Monday, June 15 through Tuesday, July 14, 2020. The public comment period is now closed.

For more information or questions

Contact Sherri Peterson at