Gullywasher provides stormwater filtration maintenance and technical services with over 40 years of industry experience. We offer turnkey solutions as well as specific services and maintenance within the stormwater compliance process including design, implementation, maintenance and monitoring.

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Technical Services

Compliance is full of paperwork and technical data. That’s why we employ QISP certified engineers and highly trained personnel to help our customers with stormwater compliance and best practices. Our technical service offerings include site walks, feasibility studies, as well as, SWPPP and site map peer review.

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Maintenance Services

Maintaining your best manufacturing practices is key to compliance and it will save you money in the long run. Gullywasher offers cleaning services such as site surface sweeping, catch-basin and vault clean outs. We also offer maintenance services such as cleaning catch basin filter inserts and maintaining and cleaning your storm water treatment systems.

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We know compliance can be a headache. Reach out to us via phone, email or contact form and get started.

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About Gullywasher

Simple. Affordable. Compliant.

That's the Gullywasher method. For over 30 years we've taken a commonsense approach to controlling pollutants in stormwater by using high-quality media and innovative designs in our filtration systems. Our systems work and we've got the lab data to prove it.

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Case Studies

Stormwater compliance can be tricky. Gullywasher offers several solutions to control storm water contaminations at your site. Explore our insight, case studies and success stories!

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Portland Postal Distribution Center

It was the Facilities Manager of the Vehicle Maintenance Center of the US Postal Distribution Center who also had the environmental responsibility of achieving stormwater quality compliance for their entire 10-acre site. Being the central distribution for the State of Oregon and SW Washington, hundreds of long-range tractor-trailers, cube vans, cargo trucks, and postal trucks …


Evans Metal Steel Fabrication

It is the final price (sticker shock) that our competition proposed that led the purchasing manager who is also the Environmental, Health & Safety manager to contact Gullywasher to perform a peer review. Evans has 5 outfalls on their site with one 5-acre building, two 1/4-acre buildings, a 5-acre employee parking lot (with materials storage), …


All Metals Processing, Inc

Their environmental manager contacted Gullywasher for a site walk to see how she could utilize our biofilter technology.  Since the site was 3.5 acres – mostly consisting of manufacturing plant space; our initial recommendations were to use two pump n’ treat biofilter processes at the 2 entrances into the complex. Typically with a site this …


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