Alternative Treatment Technologies (ATTs)

Overview

Alternative Treatment Technologies (ATT) are treatment systems that do not conform to DEQ standard system guidelines. Commonly, ATT’s incorporate an aerobic treatment process and discharge to a smaller than average absorption facility. ATT’s are required when a standard septic system will not sufficiently mitigate environmental and/or health hazards for a specific site or use. The DEQ maintains a list of approved technologies allowed for use in the state of Oregon.

Operation and Maintenance

The DEQ requires that a certified maintenance provider maintain each installed ATT system. The owner of this type of system must submit an initial operation and maintenance contract when applying for an ATT Installation permit and maintain a current contract at all times throughout the life of the system.

Your maintenance provider will provide Deschutes County a copy of your current service contract, an annual inspection report, and the required annual report evaluation fee on your behalf. However, it is ultimately up to the property owner to assure the onsite wastewater system is properly maintained and the operation and maintenance requirements are met.

Nitrogen Reducing ATT Requirement in South Deschutes County

Extensive groundwater studies have demonstrated that standard septic systems in the greater La Pine region have been and continue to pollute the shallow unconfined aquifer underlying the area, which is the primary source of drinking water for south county residents and a contributing source to the Deschutes River system. In order to prevent further pollution, Deschutes County in partnership with Oregon DEQ requires the maximum nitrogen reducing ATT system available for all new onsite wastewater treatment system installations, alterations, or major repairs in the La Pine sub-basin of the upper Deschutes River watershed.

Learn more about the South County Groundwater Protection Program.

Financial Assistance

Financial Assistance programs are currently available to help offset the costs of ATT installations. Retrofitting an existing onsite system with a nitrogen reducing ATT may also qualify for the Nitrogen Reducing Onsite Wastewater Treatment Rebate Program.