News Flash

Development & Permitting Services

Posted on: October 16, 2023

Wet Season Reminder!


Wet Season MonitoringWet Season Reminder!

As the days grow shorter, the temperature starts to drop, and rain begins, we would like to remind you that the wet season is quickly approaching. The wet season is the time of the year to conduct infiltration testing and groundwater monitoring for development projects triggering stormwater management (projects proposing 2,000SF or more of new plus replaced hard surfaces). The City of Puyallup has adopted the 2019 Department of Ecology manual which defines the wet season as running between December 21st and March 21st of each year. It is important to meet this project deadline as it may delay your project by a year. For more information regarding testing, see the DOE’s requirements here.

Is there any leniency to the Wet Season monitoring?

The City of Puyallup has created ENG Policy 22-01 to aid in the delay of Single Family, Duplex or Triplex projects. This policy allows these types of projects to conduct infiltration testing outside of the wet season. Additionally, this policy allows for a redundant stormwater system to be designed or a secondary design showing how stormwater will be designed for groundwater intrusion.


Any questions regarding this industry notice can be directed to


NOTE: When regulation updates, key policy changes and other important items are impending, an Industry Notice will be sent in advance of the effective date.  The intent is to increase communication with our customers and keep everyone more informed.  Please feel free to forward this email on to anyone who would like to be added to the Industry Notice email group; they should then reply to requesting to be added to the group.  To be removed from the group simply respond to this email with that request.


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