Stormwater Management System

Stormwater Management System

Custom Plastic Fabrications, LLC. (CPF) is proud to partner with civil engineers and stormwater management companies. Whether you are looking for a custom stormwater management system component or a stormwater tank, CPF will manufacture to your specifications. Together, we can design and create environmentally-friendly alternative solutions to replace fiberglass, steel, and concrete stormwater tanks, liners, and components for your stormwater management system.  


As a result of working with stormwater management companies and their designs, CPF has manufactured hydrodynamic devices for stormwater detention, such as a groundwater barrier and a hydrodynamic separator. A groundwater barrier prevents contaminants from entering the environment and groundwater sources. The primary purpose of a hydrodynamic separator is to remove sediments and pollutants. Hydrodynamic separators are flow-through structures that include a sediment settling or separation unit. For treating and pretreating stormwater runoff, hydrodynamic separators are an effective best management practice (BMP).  


In addition to stormwater management system components, CPF offers custom stormwater and rainwater collection tanks. These custom tanks can be above or below ground. Tank sizes range from 500 to 10,000 gallons. Modular designs are available for tanks greater than 10,000 gallons.  As rainwater management regulations become more prevalent in the United States, CPF can be part of an engineered solution to your project. You can find out more information here: Is it Illegal to Collect Rainwater: 2021 Complete State Guide | World Water Reserve 


A stormwater management system’s primary function is to retain stormwater and remove pollutants before discharging water to the environment. Stormwater systems manage runoff from rainfall or snowfall. As our world became more advanced with roads and parking lots, and other impervious surfaces, it became difficult to allow for natural stormwater runoff. Manufactured stormwater systems mimic biological processes and come in various shapes, sizes, and configurations. 


According to the United States Environmental Protection Agency (EPA), stormwater management is the effort to reduce rainwater or melted snow runoff into streets, lawns, and other sites, improving domestic water quality. 


When stormwater soaks into the soil, it is filtered and flows into streams, rivers, lakes, and wetlands. However, the wet ground from heavy rain, creates excess water that runs into storm sewers and road ditches. This water often carries debris and pollutants. 


Pavement and roofs prevent precipitation from naturally penetrating the ground in developed areas. Water instead runs rapidly into storm drains, sewer systems, and drainage ditches, resulting in: 


  • Overflow to storm and sewer systems 
  • Damage to infrastructure 
  • Flooding downstream  
  • Destruction to habitats 
  • Erosion of stream banks 
  • Stirred up sediment 
  • Streams, rivers, lakes, wetlands, and coastal water contamination 


Surface water runoff, or stormwater, and any sewer inflow, or sewer infiltration, becomes part of a municipal wastewater process.  To read more about CPF’s wastewater products click here. 


Poly Tanks Are Much Easier to Clean than Fiberglass, Steel, or Concrete.

Poly has excellent chemical resistance. Because polypropylene is a homogeneous material, it protects itself against any biohazards. Thus, there will be less contamination in your projects. Its chemical resistance protects the material from many organic solvents, acids, and alkali.

Easy Installation Process.

Unlike concrete tanks, installing a stormwater tank made out of polypropylene is effortless. Concrete tanks require a crane but poly tanks do not require one, making the installation process easier and faster using a backhoe or excavator resulting in a less costly installation. Polypropylene tanks also offer weight advantages for transportation to and on the construction site.

Poly Stormwater Structures Are More Durable than Fiberglass Tanks

Poly tanks require less support than fiberglass tanks. Unlike fiberglass tanks, poly tanks are tough and flexible. As a result, they don’t dent. Poly’s flexibility endures ground shifting better than all other materials. In addition, fiberglass tanks break down over time and need to be replaced.

More Friendly to the Environment

CPF engages in a wide range of green initiatives that demonstrate our commitment to doing business in an environmentally responsible manner. Learn more about our Green and Lean Initiatives.

Poly Tanks will not Decay and Rust

Poly tanks are leak-resistant and corrosion-free. Therefore, our tanks are not going to rust over the years, unlike steel tanks.

We Offer Product Support

A team of technicians are available Nationwide for any repair or modification to your product. Each technician is a full-time CPF employee that receives regular training. Our product support includes warranty claims, aftermarket modification product support, and post-warranty product support. Learn more about how our product support team can help you.

CPF Reclaims Material

Following our environmental responsibilities, we reclaim cut material in our factories and weld together to form additional sheets for more work. Thus, significantly reducing unnecessary waste. Also, the scrap material is reground with the supplier and recycled for future use.

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Why Custom Fabrication of Your Stormwater Management System Component? 

CPF allows you to design any size, shape, and other preferences you may have for your stormwater management system polytank or component. As well, our engineers and designers can work with you to create a design that will ensure the success of your next stormwater management system project. All tanks and components are designed to meet your specific requirements. To avoid material waste, engineers design their products to keep scrap to a minimum. We will begin manufacturing your hydrodynamic separator component, groundwater barrier, or stormwater tank once you approve the drawing.

Additionally, outsourcing to us will help you free up manpower and floor space if you are still building your own tanks. Due to the high cost of labor, this will allow you to concentrate on your core business. Polytanks are also more economical than stainless steel tanks. Here are a few more reasons why a poly stormwater management system components should be custom fabricated with CPF:

You pick the size

Custom fabrication lets you decide the specific size and any other preferences that you may have. It allows you to choose more creative designs, applications, and solutions for your storm water management system components and tanks.

Internal or integrated structure

Polytanks and components are built with an integrated design that is almost impossible to do with other types of tanks. The only method for the production of other types of tanks is from the tiring process of molding. On the other hand, in CPF tanks, we can build into the design all the compartments, work surfaces, mounting locations without any mold.

Your specifications

Each polytank or component for your system is designed to your specifications and/or drawing submittal. After approving the drawing, we’ll start the production of your product.
Our engineers and designers use CAD/CAM automation. Also, our CNC routers allow skilled fabricators to make a two-dimensional shape to fulfill nearly any requirement you may have.
If you are looking for specific measures and customizing your storm water management system CPF is your solution.

More economical

Poly is more economical and lighter weight than steel, concrete or fiberglass. CPF stormwater management system components are hand welded from cut sheet and do not require an expensive mold.

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