Shoaf Precast Septic Tanks

Shoaf Precast is a third generation family business, founded in 1966, located in Lexington, NC. Shoaf manufactures our quality precast concrete products.  Their commitment to quality, service and customer satisfaction is what sets them apart from the competition.  


non-Traffic tank

Marlin offers 240 gallon to 3,500 gallon non-traffic rated tanks for the onsite, sanitary and sewer industry.   From standard residential septic tanks to special design pretreatment tanks, Marlin has a solution to meet your needs. Non-traffic rated tanks are designed for residential and light duty commercial applications where vehicular traffic patterns do not exist and for a maximum coverage depth of three feet.


Traffic rated tank 

Often it is necessary to install a precast concrete grease interceptor or septic tank in a vehicular traffic area.   We have a full line of traffic rated products including a 6,000-20,000 gallon Septic, Pump and Grease Tanks designed and approved to handle H-20 and HS-20 loading! Each tank is reinforced with grade 60 domestic rebar, which is cut, bent and placed per engineering specifications to ensure a true traffic design.



Marlin offers different size concrete risers available in either round or square shaped depending on your preference and/or need.  We have H/20 (traffic rated) or non-traffic concrete risers in which are edged and finished to create an appeasing curbside like finish. We also offer EZset and Polylok plastic round risers (non-traffic).  Risers are very beneficial as they allow for easy location, inspection and pumping of your tank.