Deschutes County Septic Guide: Permits & Rules (2026)

Updated October 11, 2026. This guide is general information, not legal or engineering advice. Rules change, so confirm with the agency listed before you start work.

Quick reference

Topic	What to know	Source
Who regulates	Deschutes County Community Development runs the onsite septic program under contract with Oregon DEQ.	DEQ; Deschutes County
Repair permits	Minor repair: tank, effluent line or distribution box. Major repair: drain field, sand filter or treatment unit. Applied for through Oregon ePermitting.	Deschutes County
O&M program	All ATTs, plus sand filter and pressure distribution systems permitted since early 2014: service contract with a DEQ-certified provider and inspection at least once a year.	Deschutes County
South County	Advanced nitrogen-reducing systems required for new homes, major repairs and major alterations. Maximum available nitrogen reduction in the La Pine sub-basin.	Deschutes County
Licensing	Pumping and installing require a DEQ sewage disposal service license.	Oregon DEQ
Pumping	When sludge and scum exceed about 35% of the tank, typically every 3–8 years.	Oregon DEQ
Home sales	Evaluation recommended, not required. If done, it must use DEQ's form.	Oregon DEQ
Bend	New septic systems prohibited inside the city. Septic-to-sewer program applications due each year by September 1.	City of Bend

Who handles septic permits in Deschutes County?

Oregon DEQ sets the state's onsite wastewater rules, and Deschutes County Community Development administers them locally as a DEQ contract county. That means the county takes applications, issues permits, does inspections and enforces the rules. Applications for both repairs and new systems go through Oregon ePermitting.

Which repairs need a permit?

The county separates repairs into minor and major. Repairing or replacing a tank, effluent line or distribution box is a minor repair. Repairing or replacing a drain field, sand filter or treatment unit is a major repair. Replacing a tank also requires a tank abandonment form for the old one.

What is the O&M program?

Deschutes County's operation and maintenance program applies to all ATT systems and to sand filter and pressure distribution systems permitted since early 2014. Owners must keep a service contract with a DEQ-certified maintenance provider for the life of the system, with a first contract of at least 2 years. The system must be inspected at least once a year, and the provider submits an annual report and the county's evaluation fee. Providers must respond within 48 hours, and a new owner must sign a transfer agreement or new contract at sale. ATT providers must also be certified by the manufacturer.

What's the history of South County groundwater rules?

1982: DEQ found high nitrate in groundwater under the La Pine core area, which was put on sewer in 1986.
1999–2005: A $5.5 million EPA grant funded the La Pine National Demonstration Project, which field-tested nitrogen-reducing septic systems. USGS completed a groundwater and nitrate model in 2005, and DEQ revised its rules to allow ATTs.
2008: The county adopted ordinances requiring advanced systems for new development and upgrades of existing systems by 2022.
2009: Voters overturned the upgrade requirement (Measure 9-70). The new-development rule was repealed in 2011.
2016: A state land use ruling blocked the county's plan to allow new sewer systems in the area.
2022–2024: DEQ sampling found rising nitrate in some wells north of Burgess Road and in La Pine.

Today, the county requires advanced nitrogen-reducing treatment for new homes, major repairs and major alterations in southern Deschutes County, with DEQ helping set the treatment level for each site. The county reports about 10,300 lots in the area, roughly 6,900 developed, with about 1,200 already on ATTs.

Why do Central Oregon soils matter?

USGS describes the La Pine area's soils as sandy, pumice-derived and low in organic matter, allowing rapid infiltration of septic effluent, with a water table usually less than 20 feet down that rises to within 2 feet in low areas. DEQ notes that a seasonal high water table is the most common reason site evaluations are denied there. Pressure distribution systems are used on small lots and fast-draining soils to improve treatment.

Who can pump or install a septic system?

Any business that builds septic systems or pumps and hauls septage, or advertises those services, needs a DEQ sewage disposal service license (installer, pumper, or pumper/installer). Installer businesses need at least one DEQ-certified installer, and people who maintain ATTs and sand filters must be DEQ-certified maintenance providers. Check a company on DEQ's onsite license search.

How often should I pump and inspect?

Oregon DEQ recommends pumping when sludge and scum fill more than about 35 percent of the tank, typically every 3 to 8 years. The EPA recommends inspections at least every 3 years, and every year for systems with pumps, floats or other mechanical parts.

What about Bend?

About 2,800 Bend households were still on septic as of 2018, mostly in southeast Bend. City code prohibits new septic systems inside the city, and the septic-to-sewer program created in 2018 helps neighborhoods connect, with a 50 percent connection fee discount for owners who sign on and connect within 2 years.

Common questions

Who issues septic permits in Deschutes County?

Deschutes County Community Development, acting as Oregon DEQ's contract agent. Applications go through Oregon ePermitting.

Do I need a maintenance contract for my septic system?

If you have an ATT, or a sand filter or pressure distribution system permitted in Deschutes County since early 2014, yes. Annual inspection by a DEQ-certified provider is required.

Is a septic inspection required to sell a house in Oregon?

No, but DEQ recommends one, and any evaluation must use DEQ's approved form.

Deschutes County septic guide (2026)