Septic Systems Products ST800LP ST1000LP ST1200LP ST1500LP Traffic Rates & Sizes Available ST800LP ST1000LP ST1200LP ST1500LP Larger Sizes Also Available ST2000LP ST2500LP ST3000LP ST3750LP ST4500LP ST5000LP ST6000LP Accessories Infiltrator, Seal-R Risers, Grade Rings & Covers Understanding and Care of Your Septic System Mid-State Concrete Products, Inc., is a leading manufacturer of precast concrete septic systems. All septic systems are delivered and set into the excavated hole.  Septic systems are growing in complexity with increasing concerns for human welfare and environmental safety. Mid-State Concrete keeps abreast of these changes and requirements and offers a full range of specialty products to meet the needs of municipal and private uses. All of Mid-State Concrete's septic systems are manufactured in accordance with the requirements of ASTM and IAPMO specifications.  Full ranges of tank sizes are available at all times. We also inventory a complete line of accessories for the septic systems, such as risers, pumps, filters and leaching systems.