The US EPA Underground Injection Control Program governs certain systems that drain liquid waste into the ground. Class V Injection Wells are of specific interest to Minnesota's SSTS Professionals, especially rules governing Large Capacity Septic Systems (LCSS).
US EPA Class V web page >>
A number of disposal wells such motor vehicle waste disposal wells, large capacity cesspools, and stormwater drainage wells were previously allowed. They have been discovered to be significant sources of pollution, and their use has subsequently been prohibited.
Class V Well Types >>
This page is designed to give owners and operators of Large Capacity Septic Systems (LCSS) an overview of the Underground Injection Control Program and help them learn how to comply with Class V regulations. Class V Large Capacity Septic Systems >>
A septic system is considered a LCSS if it receives solely sanitary waste either from multiple dwellings, or from a non-residential establishment, where the system has the total capacity to serve 20 or more people per day. All LCSS owners or operators must complete an
inventory form >>
and submit it to Region 5 EPA offices >>.
This page also describes EPA's approach to improving the management and performance of onsite and decentralized systems nationwide.
More about Class V Large Capacity Septic Systems >> (.pdf)
The MPCA regulates and provides guidance for Commercial and Clustered SSTS.
Regulatory and Other Considerations >>
Commercial Systems are septic systems serving restaurants, resorts and other businesses, known as "Other Establishments" according to MN State Rule. Section 5, pages 5-10 of the Manual for Septic System Professionals in Minnesota suggests a number of design considerations for many common other establishments.
Designing a SSTS for a system serving a non-dwelling requires special attention to flow and waste strength issues.
Cluster Systems typically provide treatment to a group of homes.