Retrofit Stormwater Filtration Systems

We will make your existing stormwater treatment system into an effective stormwater treatment system to hit your compliance benchmarks. Gullywasher has led the industry for 20 years.

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The Last Upgrade You'll Ever Need

Gullywasher has seen it all. Maybe you are flushing money down the drain because of exorbitant maintenance costs due to media failure or maybe your system will not be able to meet newer legislation requirements. Regardless of your reasons, we can help you save money and get your site compliant.

Improve Performance

Our extensive experience in the industry has allowed us to have design features and material selection far superior than our competitors. It is time to be in compliance with Gullywasher.

Address Relevant Pollutants

Different sites and operations will have different contaminants on their discharge, that is why Gullywasher has twelve product lines to address whatever issue your organization is facing.

Lower Maintenance Costs

We often see bad calculations in flow throughput or bad media choices that create recurring costs. Gullywasher eliminates unnecessary maintenance costs.

Talk to Someone Today

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

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Our Process

Our goal is to achieve consistent compliance without breaking the bank. Upgrading your current stormwater management process will allow you to save exorbitant maintenance fees and compliance issues. Allow one of our qualified technical personnel to visit your facility and assess the state of your filtration system. We can do a free assessment and propose a plan of action that can save you money and headaches.


Our qualified technical personnel can visit your site to inspect your facilities, paying close attention to common problem areas and along with compliance data assess potential equipment malfunctions and identify underperforming components.


Gullywasher has created and re-created hundreds of stormwater treatment systems across a wide range of industries. We'll take the existing system, address issues by integrating appropriate equipment with your existing filtration system.


We like to get our hands dirty. So after we've figured out what the issue is and how to address it, we will also source the material, bring it down to your facility, install it and make sure it works. We strive for excellence in customer service.

case study

AutoGator Recycling Back to Baseline Status!

AutoGator sure does stir up the imagination. It is an auto/truck salvage yard established on the outskirts of Sacramento. What I imagine is a huge gator just ripping apart the junk vehicles. However, that is really farther from the truth. With careful thought, Ron Dumas has redesigned his company’s work environment in order to meet …


Proven to Remove up to 99.7% of Metals

Explore our case study of a major semiconductor manufacturer and review the third-party lab results.

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Connect for Retrofitting

You have questions, we have answers. Drop us a line about our retrofitting services and we'll get back to you within 24 hours.

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