Poly Processing Company manufactures vertical (upright) plastic tanks that meet or exceed ASTM D 1998 standards. We have thre ... e strategically located manufacturing facilities to provide our customers with consistent and reliable service throughout North America. We have the production capability to mold plastic tanks with capacities as large as 13,650 gallons. Our Company Headquarters is located in Monroe, Louisiana with additional facilities in French Camp, California and Winchester, Virginia. read more