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The rest of our site is currently under construction. We will be expanding to include help, photos and contact pages over the next two weeks. Thanks! - 01/26/09

Whalen Designs is a company that has been designing residential and commercial septic systems for over 30 years. We are based out of Monroe, Washington but have completed projects for clients all over the state of Washington.

Whalen Designs is a trusted septic design firm. We are happy to provide for all you septic system needs including:


  • Site Evaluations
  • Drainfield Designs
  • New Construction
  • Repair/Alteration Designs
  • Multifamily
  • Commercial (up to 3500 gals/day)
  • Video diagnostic services including pipe inspection and pipe locating


An improperly designed septic system can have unnecessary installation cost. Don't hire just anyone to design your septic system. Our 30+ years experience gives us unequalled knowledge to handle difficult sites, while meeting the clients septic system needs. Whether it's a drip field, sand filter, or any other type of septic system, we can provide quality evaluations, cost estimates, and design consultation.



Ph: (360) 794-5506   |    (360) 568-8531   |    1-800-851-5180     Fx: (360) 794-6349      P.O. Box 262 Monroe, WA 98272