Which of the following systems is not covered by a Class I certificate?

A Class I certificate typically covers conventional onsite sewage disposal systems, which include several types of waste management technologies. However, the systems that fall under a Class I certificate generally pertain to conventional septic systems and their components.

Composting toilets, which convert human waste into compost through a controlled aerobic process, are unique in their operational processes and regulatory considerations. They do not function in the same manner as typical septic systems and often require a different certification because they manage waste in a fundamentally different way compared to systems like absorption beds or holding tanks.

Absorption beds, holding tanks, and greywater absorption systems are designed for the treatment and management of wastewater and can be regulated under the Class I criteria. Thus, these systems align more closely with the traditional understanding of septic systems, while composting toilets represent a separate category of technology requiring distinct regulatory oversight. This distinction is important for understanding the classification and certification of various sewage disposal methods.