The following producers are approved to furnish 1500 D (75D) through 3750 D (175D) concrete pipe on the basis of certification:
SUPPLIER PLANT LOCATION
American Concrete Products Omaha, NE
County Materials Corporation* Holmen, WI
County Materials Corporation Marathon, WI
County Materials Corporation Iowa City, IA
Cretex Concrete Products Midwest, Inc. Cedar Rapids, IA
Cretex Concrete Products Midwest, Inc. Humboldt, IA
Cretex Concrete Products Midwest, Inc. Iowa Falls, IA
Cretex Concrete Products Midwest, Inc. Marshalltown, IA
Cretex Concrete Products Midwest, Inc. Plattsmouth, IA
Cretex Concrete Products Midwest, Inc Des Moines, IA
Hancock Concrete Products Canon Falls, MN
Hancock Concrete Products Courtland, MN
Hancock Concrete Products Company Hancock, MN
Hancock Concrete Products Lake View, IA
County Materials Corporation Buffalo, IA
Rinkers Materials Concrete Pipe Division Valley, NE
*Limited to bell and spigot reinforced concrete pipe.