1500 Gallon Septic Tanks: Precast Monolithic

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
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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!
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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 1500 Gallon Concrete Septic Tank Overview

Monolithic 1500 gallon septic tanks are designed to hold 1500 gallons of liquid.

For 5 bedroom home waste water applications and pump tank stations, this size of septic tank is the optimal choice.

Our team at A.J. Foss has the experience and expertise to create precast concrete tanks with robust structural integrity.  For each job, every size and style of septic tank we manufacture meets all health code requirements and best-practice requirements of ASTM C 1227 & NPCA.

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    New HampshireVermontMaineMassachusetts


    Choose the Inlet and Outlet Option You Need

    For many local area residential septic applications, the monolithic, top-seam style concrete septic tank is ideal.

    Plumbers can run pipes that aggregate waste water from home drains to inlet areas on the side or middle of this type of tank. This plumbing option is also available for outlet pipes that connect from either side or center outlet fittings and outlet connection sizes to a leach field.

    Polylok IV closed end plumbing boots are used for the tank’s penetrations. They do a great job of providing water tightness with flexible connection to the pipes coming into and going out of the precast structure.

    A Residential Waste Management System

    Underground Septic Tank

    A.J. Foss is a trusted area leader in septic tank manufacturing. Our team of septic tank experts know all types of septic systems and can access each product type, including tank ready septic tank accessories and customizable options.

    We also provide area home owners and business customers with an outstanding tank warranty and peace of mind that every robust, one-piece tank from A.J. Foss is designed to prevent tank failures and deliver lasting, low-maintenance use.

    1500 Gallon Monolithic Septic Tank Details
    Tank dimensions10’10” x 5'7” x 5’8”
    Number of bedrooms supported5
    Ideal for high water tableYes
    Average retail cost$1705.00
    Number of covers (lids)2
    Can come in traffic rated (H20) capacityYes
    Concrete strength5,000 PSI
    What are its gallons per vertical inch31
    Weight12,500 lbs.
    Fiber reinforcedYes
    Number of inlets boots (Up to schedule 40 pipe can slide through)3
    Height of Inlet from bottom of tank to bottom of pipe56”
    Number of outlets boots (Up to schedule 40 pipe can slide through)3
    Height of outlet from bottom of tank to bottom of pipe53”
    Required height of inlet baffle (20% of liquid level)10”
    Required height of outlet baffle (40% of liquid level)20”

    Frequently Asked Questions

    How much does a 1500 gallon capacity precast concrete septic tank cost?

    Answer:  The average retail septic tank cost for a 1500 gallon precast concrete septic tank size is $1,590.

    How many bedrooms does a 1500 gallon septic tank support?

    Answer:  In New Hampshire a 1500 gallon septic tank can service a home with up to 5 bedrooms.

    Are one compartment tanks ideal for properties with high water tables?

    Yes.  Ideally you want a monolithic septic tank which is a one compartment septic tank with the seam at the very top of the septic tank in high water table situations.  This is a common choice for properties with high water tables, since the liquid is below the lid so nothing can leak in or out.

    How much does a 1500 gallon concrete septic tank weigh?

    The shipping weight of our 1500 gallon tanks is approximately 12,500 lbs., but weight varies slightly with precast manufacturers depending on the dimensions, wall thickness, floor & top thickness, & rebar reinforcement.

    H-10 Loading Precast Septic Tanks

    A 1500 H-10 Loading Precast Septic Tank Ready for Delivery

    Can you drive over a 1500 gallon concrete septic tank?

    It depends on the septic tank design rating.  We manufacture to 3 variations of tank description and design ratings: H-10 loading precast septic tanks are suitable for pedestrian traffic with 300 lbs. of live load per square foot plus 3’ of burial depth.  HD is suitable for burial depth up to 5’.  H-20 is suitable for drive over traffic and up to 6’ of burial depth.

    Can you install a 1500 gallon concrete one compartment septic tank in one piece?

    Yes, we can install 1500 gallon low profile septic tanks in one piece. Our septic tank delivery trucks and cranes are capable of setting even larger tank sizes (up to a 1750 gallon tank) in one piece.  Because these concrete precast tanks are in one piece, the installation time for your concrete septic tank delivery is reduced to a shorter period of time.

    When is septic tank installation of a tank above ground appropriate?

    Installation of a concrete tank above ground is appropriate for a sand mound septic system.  This system is recommended when site conditions for your tank location do not allow for installation of concrete tanks such as proven conventional sometimes called old-fashioned concrete septic tanks.

    1500 gallon precast monolithic septic tank drawing.Features/Details*

    • 1500 gallon septic tank is used in 5 bedroom systems.
    • Also used as a pump station
    • Common size for grease traps
    • Is delivered pre-assembled for ease of installation
    • Top seam tank for use in high water table areas or where preventing water infiltration is critical

    * Details shown are NH-specific; for details of other states’ specifications.

    You may also be interested in these popular precast concrete septic tanks.

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