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Water Services

Stormwater Management Manual

The 2021 Stormwater Management Manual revisions are approved and available for review. They will become effective on 9/18/21. For projects wishing to apply under the current regulations, the following deadlines must be met:

  • Grading Permit Application submitted to the Metro Water Services’ Development Review Section by: 9/17/21, and
  • Grading Permit Application passes review by: 3/17/22, and

Reminder: After Grading Permit approval, a site will have 6 months to attend a Pre-construction meeting and then 6 months from the date of the Pre-construction meeting to obtain a Grading Permit. Failure to meet those timeframes will result in the Grading Permit approval being “expired” (per Stormwater Management Manual Vol. 1 - Sections 4.3.4 & 4.3.6).

Please contact Rebecca Dohn ( with any questions or for additional information.

2021 Stormwater Management Manual

Once the new version of is live this Stormwater Management Manual page will include links to all volumes broken down into their respective chapters, sections and practices. We apologize for any inconvenience.

Former Stormwater Management Manual Volume 1

If a project has sufficient site limitations that preclude it from meeting the Low Impact Development requirement, they will need to submit a Low Impact Development Waiver Application electronically to Steve Mishu. (

You may be eligible for a reduction in your Stormwater User Fee! Please see the Stormwater User Fee Credit Manual for more information.