What does Tier 3 have the authority to do regarding onsite wastewater systems?

Tier 3 classification is essential within the framework of onsite wastewater management, specifically regarding the capabilities and privileges granted to those certified in this tier. The authority to install all Tier 1 and 2 systems signifies a broader scope of responsibility and skill set that includes both basic and more advanced onsite wastewater systems.

Tier 1 systems are typically the simplest forms of onsite wastewater treatment, often involving conventional septic systems. Tier 2 systems can involve more complex designs or treatments, such as aerobic treatment units or other innovative technologies that require more specialized knowledge and skills to install correctly. By allowing Tier 3 professionals to install both Tier 1 and Tier 2 systems, it ensures that these systems are handled by individuals with a higher level of training and experience, which is crucial for compliance with the state's regulatory requirements and for ensuring public health and environmental protection.

This classification also indicates that Tier 3 authorities are equipped not just for installation but also have the necessary expertise to manage and implement more intricate solutions that vary according to site-specific conditions. Thus, the correct response reflects Tier 3's comprehensive capability in onsite wastewater management, as opposed to limited functions like merely conducting repairs or restricting installations to only commercial systems or Tier 1 systems.