The University of Minnesota Onsite Sewage Treatment Program provides septic system owners with best management practices and basic information on how your particular system works. The webpage is a great tool and can be found at the below link:
University of Minnesota Septic System Owners
If you need a compliance inspection, the Minnesota Pollution Control Agency (MPCA) keeps an active list of licenses businesses available at the following link:
Minnesota Pollution Control Agency SSTS Search
The MPCA also provides an vast array of resources at the following link:
MPCA Subsurface Sewage Treatment Systems