Underground Supply Inc.

About Us

Underground Supply has been family owned and operated since 1991. Serving Western Massachusetts and surrounding areas with quality precast concrete septic tanks, distribution boxes, basement entryways and related construction products.

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USI’s State Of The Art Batch Plant

Our manufacturing facility, located on RTE 5 in Whately, houses a Mixer Systems computer controlled concrete batch plant yielding precise component control, producing a consistent high quality mix every batch.

Efficiency & Safety on the Job Site

Delivering 1500 gallon septic tanks in one piece provides added safety on the job site, eliminating in-the-hole seam alignment. Preassembly of tanks allows testing tank integrity at our shop without disturbing the seam for delivery.

  • Traditional Mid-Seam
  • Monolithic Top-Seam
  • Precast Products
  • Septic System Materials

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Underground Supply, Inc.

Underground Supply, Inc.
  • Manufacturer of Precast Concrete Products
  • Distributor of Water, Sewer, and Drainage Piping and Accessories

Based in Whately, Massachusetts, Underground Supply Inc. is your leading Western Massachusetts source for precast concrete basement entrances, concrete septic tanks, septic accessories, piping and contractor supplies.

Our goal is and will always be to provide our customers with the highest quality concrete title 5 compliant products and accessories with friendly knowledgeable service.

Come by and visit our yard at

82 State Road Whately, MA 01093.

Or call (413) 397 3412