We’ve been providing quality,
cost-effective waterproofing, drainage, and sewer solutions in the Pacific Northwest for over 20 years.

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Since 1991, Allied Waterproofing & Drainage has earned a reputation for providing quality workmanship and cost-effective solutions for all types of drainage, waterproofing, sewer and water pipe replacement.

We continue to operate today with the same core values established in our humble beginnings: Quality, Honesty, Integrity, and Reliability. Learn more »

“In my 10 years living in Seattle, I have yet to meet a company with as strong a work ethic and commitment to a job well done as Allied Waterproofing.”
– Ken Mooney (Seattle, WA)

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