IA HSB736

Owners of private sewage disposal systems must enter a monitoring and maintenance contract with a manufacturer-certified technician before installation, with the contract required for the system's lifetime and a copy provided to the county sanitarian.

Class A proprietary treatment systems (passive media-based filters like peat moss biofilters or textile filters) require annual inspections, while Class B systems (mechanical aeration or fixed film) require inspections at least twice per year.

All monitoring and maintenance must be performed by certified technicians who report results to both the system owner and county sanitarian; inspections must be performed by the county sanitarian.

Class B systems cannot be used for vacation homes, churches, event facilities, or other infrequent-use facilities, and may only be installed when sites are unsuitable for soil absorption systems, sand filters, or Class A systems.

Private sewage disposal systems are defined as those serving four or fewer dwelling units or fewer than 16 individuals, including septic tanks, holding tanks, chemical toilets, and portable toilets.