Oil-Water Separators

Great customer service, knowledgeable and honest. Thank you.
The best precast products around
Always willing to work with you. Good products at a fair price.
Delivery driver for the septic tank was awesome!!
Good business. Great service. Very prompt on delivery and a well-made product. Thanks
Great service fast delivery
Great family run and operated business. Helpful with questions and the delivery, product and service is the best in the state.
Great service!
They consistently deliver quality products on time. I use them every time I install a septic system, Great Job!
Very nice people.
Helpful , locally owned , friendly. I had a great experience with them.
I was looking for a new Presby septic system and I found Andrew J Foss. This company is great, awesome customer service, honest people, and really helpful. Thank you Andrew.
I have been a customer of AJ Foss for 18 years, they go out of there way to make my jobs successful. They are always prompt and courteous, I will continue to use them in the future
Andrew J Foss has everything I need as an excavation contractor. Their service is prompt and their prices are very competitive.
I called them to buy a septic tank and distribution box and they were very helpful and reasonably priced. I would buy from them again!!!!!!
I have had the opportunity to cross paths with AJ Foss many times over the past 10 years, and I have been consistently impressed with the quality of this organization. The number of contractors that trust AJ Foss for their precast concrete needs tells the story. Contractors don't want to insecurity, and the trust they put in AJ Foss speaks volumns. A quality family-run operation that has served southern NH for decades. If you are a contractor and you are NOT using AJ Foss, you owe it to yourself to check them out.

Precast Concrete Oil-Water Separator Tanks

The job of concrete oil-water separator tanks is to remove oil from waste or water streams before water is discharged into a septic or drainage system. Our team at A.J. Foss can manufacture any precast concrete oil-water interceptor as traffic or non-traffic rated, depending on your needs and application.  Our service area spans New Hampshire, Maine and Northern Massachusetts.

Plumbing drains and pipes at a home or commercial property must be maintained to protect personal property and the environment from oil and grease in the wastewater system. Drains that receive area waste water discharge processed by an oil water separator will introduce less grease and oil to a septic system.

Advantages of Precast Oil-Water Separator Tanks

Strength: The strength of precast concrete gradually increases over time. Plumbers and plumbing system designers know that the load-carrying capacity of precast concrete is derived from its own structural qualities and does not rely on the strength or quality of the surrounding backfill materials. Also, precast concrete oil-water separators can easily support heavy vehicular loads typically found near food service establishments, allowing for convenient placement under parking lots.

Quality: Since precast concrete products are manufactured in a controlled plant environment, they exhibit high quality and uniformity. Installed with high-quality sealants, precast concrete provides a superior, watertight solution.

Easy to Maintain: Adding a water and oil separator tank monitoring system records information such as oil and solid levels, liquid levels and temperature.  This allows people to develop an optimized maintenance schedule. Monitoring systems can be specified and installed, which adds to overall project cost savings.

Water Buoyancy Resistance: With a specific gravity of 2.40, precast concrete products resist the buoyant forces associated with underground construction. In comparison, fiberglass has a specific gravity of 1.86 and high-density polyethylene (HDPE) has a specific gravity of 0.97.

Environmentally Friendly: Precast concrete is non-toxic, environmentally safe and made from all-natural materials, making it an ideal material for underground use. Concrete has no proven ill effects on groundwater and surface water quality. Specially-designed sealants and rubber gaskets ensure that all pollutants are contained within the interceptor.

The A.J. Foss team can manufacture any precast concrete oil-water separator as traffic or non-traffic rated, depending on your needs and application.

Traffic-Rated Oil-Water Separator 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.

Delivering More than Products

Our team strives to provide our customers 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 customers with a colored folder that includes:

  • A diagram of their new precast concrete septic tank, including the size, structural load design (H-10, H-15, H-20, or HS-20) and the access-cover size and its location on the tank. This information is important for the long term, so if the tank ever needs to be pumped out or if a pump inside the tank ever fails, these details will help to streamline servicing and maintenance.
  • A Septic Smart brochure - A homeowner’s guide to use and care of their septic system.
  • Information about the benefits of concrete, and our A.J. Foss contact information for reference.

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.


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.



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