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Septic Tanks

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Septic tanks are formed from a wide variety of materials, of which concrete and plastic are the most common, although steel is available as a much less popular option. Read More…

Septic Tanks Septic tanks are on-site sewage treatment systems that are often used when a connection to sewage pipes cannot be made. They store substances that are utilized in sewage industrial processes.
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Leading Manufacturers

Mobile, AL  |  800-226-1134

With over 100 years combined experience, All Plastics and Fiberglass has the experience to handle all your plastic and fiberglass needs.

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All Plastics and Fiberglass, Inc. $$$

Fort Wayne, IN  |  800-228-7716

Specializing in fabricated plastic tanks such as water tanks, polypropylene tanks, polyethylene tanks and storage tanks, Park Plastic Products is capable of making your plastic tank in any size or dimension.

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Park Plastic Products $$$

Orange, CA  |  877-768-6585

Roto Dynamics Inc., custom rotational molders serving rotomolding and plastic tank needs nationwide. We are dedicated to our customers manufacturing needs. Building customer relationships based on integrity and communication assists us in developing a competitive advantage within the industry.

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Roto Dynamics Inc. $$$

Lake City, PA  |  814-774-2500

Sterling is a leader in the design and fabrication of plastic tanks. We set ourselves apart from the competition because of our ability to manufacture your product quickly and deliver it on time. With more than 30 molding arms constantly in use, we can manufacture your product quickly, and our products are nothing short of the best quality. Contact Sterling today!

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Sterling Technologies, Inc. $$$

Hospers, IA  |  712-752-8432

In business since 1976, Den Hartog provides tank installation, tank removal and the best new or pre-owned equipment all with quality personal attention. Consider our large line of used fiberglass, steel, stainless steel and plastic tanks--every size tank. Poly tanks are light and durable, perfect as water or chemical holding tanks. We also distribute new tanks by Chem Tainer and RMI.

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Den Hartog Industries $$$

Pearland, TX  |  281-648-0909

Sherman Roto Tank specializes in tanks that are manufactured to be suitable to store and process chemicals. Our tanks are a great choice for any industry. All our products go through extensive testing in order to surpass the industry standards.

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Sherman Roto Tank $$$
placeholder image All Plastics and Fiberglass, Inc. Park Plastic Products Roto Dynamics Inc. Sterling Technologies, Inc. Den Hartog Industries Sherman Roto Tank

Offering many advantages over both concrete and steel, plastic septic tanks feature high resistance to cracking, zero rust, light-weight, high corrosion resistance, water-tightness and low costs. Of the plastic materials, polyethylene (PE), a light, chemical-resistant thermoplastic, is the most commonly used plastic resin used for plastic septic tanks.

Polyethylene resins can be linear high-density (HDLPE), cross-linked high-density (XLPE), or linear low-density (LLDPE) resins. Following are polypropylene, polyvinyl chloride and polyvinylidene fluoride. In comparison to polyethylene, polypropylene (PP) is a light, durable thermoplastic that is denser, stiffer, and stronger than polyethylene and has a much higher melting point of 320ºF.

Polyvinyl chloride (PVC) is a durable, transparent thermoplastic that is resistant to non-essential oils but cannot be exposed to some solvents. Polyvinylidene fluoride (PVDF) is another durable thermoplastic that has high resistance to chemicals and abrasion.

Septic systems consist of two major parts: a drainfield and a septic tank. The drainfield functions to remove contaminants and impurities from the liquid that emerges from the septic tank, and can also be referred to as either a leach field or a leach drain. The septic tank itself allows wastewater to enter in the first chamber of the tank.

After solids have settled and scum starts to float they are anaerobically digested, thus reducing the volume of solids within the septic tank. Next, the liquid component flows through the dividing wall into the tank's second chamber. In this chamber further settlement occurs, with the excess liquid then draining into the drain field. The majority of plastic septic tanks are formed using either a molding or welding process.

Plastic tank molding, including rotational, blow, and injection molding, involves using a model shape to form the tank. Plastic tank welding is a process in which two pieces of heat-softened plastic are joined through the application of pressure. Examples of this process are hot air and extrusion welding. Septic tanks differ in size and capacity, ranging from small tanks holding a few gallons to tanks exceeding 35 feet in length, with a storage capacity of 50,000 gallons or more.

Septic Tank Informational Video