Septic Tanks


Tank-Logo.jpgA.J. Foss manufactures durable, watertight, easy to install precast concrete septic tanks that provide a dependable and environmentally-friendly, “green” component to your septic system. Each customizable septic tank is crafted with high-quality 5,000 psi concrete that we regularly test using ASTM C31 and C39 quality testing guidelines. Our Type III high early strength cement is tested each month to ensure that it complies with ASTM Standard C 150 and AASHTO M 85 requirements. Each precast concrete tank also meets the pertinent requirements of ASTM C 1227 for concrete strength, reinforcement, size, capacity, water-tightness, and identification with the A.J. Foss logo.

We offer the option to install a plastic riser and aesthetically-pleasing dark green cover to bring the tank to grade level to create a watertight connection from the top of the tank to ground level, thus mitigating any ground water infiltration.

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Large In-stock Selection of Precast Concrete Septic Tanks

A.J. Foss is your go-to resource for precast concrete septic tanks, with 20 acres of in-stock products ready for rapid delivery throughout New Hampshire, Maine and northern Massachusetts. We offer the area’s largest selection of in-stock residential septic tanks up to 3,500 gallons, and can often deliver on the same day you order -- with our renowned service of providing you with a one-hour delivery window -- to support your project sequencing and maximize your productivity.

Septic Tank Sizes

Our non-traffic rated precast concrete septic tank sizes range from to 300 to 3,500 gallons. Our traffic-rated precast concrete septic tank sizes range from 600 to 8,000 gallons. Single Compartment, Two Compartment, and Three Compartment tanks as well as custom tanks are also available.  Click here for our Quick reference tank dimension sheet.

Septic Tank Sizing Tools for Builders, Designers and Contractors

To ensure that builders, designers, and contractors specify the proper tank size and install to the proper dimensions, we provide these professionals with our proprietary in-house designed A.J. Foss Septic Tank Size Guide. This unique and valuable tool enables a user to slide up or down on the size-chart to locate the values that correspond to a particular A.J. Foss tank size. This weather-resistant chart is designed to be easy for contractors to leave in their trucks and equipment, so when they need to dig a hole, the dimension chart is right in front of them.

Delivering More than Products

Our team believes in providing clients with detailed information about the design, installation and care of our A.J. Foss-crafted precast concrete septic tank systems.

With every delivery, we supply clients with a colored folder that includes:

Clients can also be assured that we maintain internal records for each size of traffic-rated tank that we sell, including in-depth drawings that detail rebar placement, calculated stress loads, and more.

Traffic-Rated Tanks

Often a precast concrete septic tank or grease interceptor must be installed below a vehicular traffic area, requiring an H-20 or HS-20 traffic-rated loading. A.J. Foss manufactures precast concrete septic tanks, grease interceptors and oil-water separators designed to handle H-20 and HS-20 loading.

Each traffic-rated precast concrete tank is manufactured with our high-quality 5,000 psi concrete using Type III cement, as well as thicker side walls, bottom and top slabs to meet loading requirements.

For each traffic-rated precast concrete tank that A.J. Foss builds, we provide our clients with a diagram and documentation of the tank’s design and testing to verify that the structure can withstand HS-20 loading. This assures clients that our precast concrete tanks are designed and built to exact specifications, using the proper rebar size, grade, lengths, bends, and placement to ensure successful performance.

About Traffic-Rated H-20 and HS-20 Loading

Septic tanks designed to handle traffic-rated loads have thicker side walls and bottom and top slabs, and require specialized equipment to handle their additional weight.

H-20 Loading is defined by the American Association of Highway and Transportation Officials (AASHTO) as a vehicle load with an 8,000 pound front axle and one rear axle weighing 32,000 pounds representing a 16,000 pound wheel load.

HS-20 loading is defined as a vehicle load with an 8,000 pound front axle and two rear axles weighing 32,000 pounds each representing two 16,000 pound wheel loads.

Support for Designers

A.J. Foss supports design professionals by providing these tools for all precast products:

Custom Cisterns up to 15,000 Gallons

A.J. Foss also manufactures cisterns for water storage in sizes up to 15,000 gallons for many applications, including irrigation cisterns, fire cisterns, and sprinkler cisterns. Our durable, watertight cisterns are a long-lasting alternative to wells and other non-watertight receptacles.

Check out our Cistern Product Page for Updates!

Contact us to discuss your projects throughout New Hampshire, Maine and northern Massachusetts that require precast concrete septic tanks, custom tanks and cisterns, and discover the A.J. Foss difference for yourself.