The purpose of regulating the design, installation, and maintenance of septic systems (onsite wastewater treatment systems) is to prevent public health nuisance and ensure compliance. ​

The Department's goals are:

• Ensure that these systems can operate in all weather conditions with minimal maintenance
• Prevent the contamination of groundwater from improperly designed onsite systems
• Prevent the contamination of surface water from improperly designed onsite systems
• Prevent premature failure of onsite wastewater treatment systems