Norwesco Septic Tanks

Norwesco, Inc. is North America's third largest manufacturer of rotational molded tanks. The company produces a large line of FDA approved polyethylene tanks for agricultural, water, closed-top industrial, and below ground septic and cistern needs.

Company History

Founded in 1939, Norwesco, Inc. began as Northwest Plastics, Inc. in St. Paul, Minnesota. In 1973, the company was ranked number one of the oldest and largest plastic manufacturers in the United States. At that time, it changed its name to Norwesco.

Norwesco was a publicly traded company until January 1988, when private management acquired the company. Today, Olympus Partners is Norwesco's financial partner.

Norwesco operates 17 plants in the United States and Canada and is ranked one of the top ten rotational molders in North America by Plastic News.

Special Features

Norwesco has three lines of polyethylene tanks, the standard line, the bruiser tanks, and the Rochester line.The Bruiser Tank is a multi-purpose tanks that can function as a septic tank, holding tank, pump chamber, or as a cistern tank. These tanks are pre-plumbed, come with a water tight lid and can hold from 1,000 to 1,500 gallons.

The Rochester line has a strong structure and is designed to limit manhole, sidewall, and bottom deformation. These tanks are made with single, double, or heavy duty compartments. Single and double compartments range from 900 - 1,500 gallon capacities while the heavy duty compartments can hold 1,050 to 1,500 gallons.


Norwesco provides a full three-year warranty on all septic tanks.

Contact Information

Norwesco Inc.
P. O. Box 439
4365 Steiner Street
St. Bonifacius, MN 55375-0439

800-328-3420 (Customer Service)