Engineered Concrete Products
Septic Tanks - Manholes - Inlets and More!!!

Precast Concrete Products

Septic Tanks - Cisterns - Separators

1,000 and 3,000 Gallon Septic Tanks

1,200 and 3,500 Cisterns 

1,000, and 1,500 Oil-Water-Sand Separators


Heavy Duty Vaults


Pump and Valve 

Storm Water Inlets and Junction Boxes - Standard DOT and Custom Sizes

Larger Engineer Tanks for Septic, Cisterns, or Oil-Water-Sand Separators.

Box Culverts

Custom Sizing

Flared End Sections

Three Sided


Projects & Drawings

Precast Concrete Building Panels

Insulated and Non-Insulated

4' to 32' in Height

4' to 14' in Width

Projects & Drawings

Inlets and Junction Boxes

Type B

Type C

Type S

Junction Boxes

Covers and Adjustment Rings

Projects and Drawings

About Us


  Become an industry leader in the precast concrete products market through customer satisfaction and owner loyalty.  

Mission Statement

Manufacture precast concrete products that provide engineering solutions, improved constructability, at a competitive price.

Leadership Team

David Hoffman

David has spent 18 years in the concrete industry.  The last 10 years has been in precast concrete market developing and managing processes to build awarding precast products.  David has a B.S., Mechanical Engineering, SD School of Mines and Technology.  

William Huber

William has been in and around the construction industry for the past 31 years, managing and developing construction processes and products.  William has a B.S., Civil Engineering, SD School of Mines and Technology.   

Contact Us

Engineered Concrete Products, LLC.

3335 Seger Drive, Rapid City, South Dakota 57701, United States

Sales - William S Huber
(605) 415-8877
Production - David Hoffman
(605) 430-8449