Septic System Regulations in Oregon

In Oregon, onsite wastewater (septic) systems are regulated by Oregon Department of Environmental Quality (DEQ), Onsite Wastewater Management Program, which sets the statewide code; some counties are delegated to issue permits and inspect locally, others are handled directly by the state agency. Installing, replacing or repairing a septic system here means, in sequence: a site and soil evaluation, a design, a permit application, an inspection while the system is open, and a final as-built record once it is approved.

Who regulates septic systems in Oregon

The state-level regulator is Oregon Department of Environmental Quality (DEQ), Onsite Wastewater Management Program (official program page). DEQ directly permits residential and small business septic systems in Curry, Jackson, and Josephine counties (through its Medford office); in Oregon's other 33 counties, DEQ contracts with local jurisdictions to administer residential and small business septic permitting.

The statewide onsite-wastewater code is cited as OAR Chapter 340, Divisions 071 and 073 - Onsite Wastewater Treatment System Rules. We link the agency's own page above rather than restating specific numeric requirements from it, since those change by rule revision and by local amendment.

The permit sequence

The order of operations is broadly consistent across the country, even though the specific numbers in each step vary by state and often by county. None of the figures below are specific to Oregon; treat this as the shape of the process, and get the actual numbers from the agency linked above or from the county office.

1. Site and soil evaluation. A qualified evaluator (see licensing below) digs test pits or runs a percolation test, and records the soil profile, depth to seasonal water table, depth to any restrictive layer, and slope. This determines whether the lot can support a conventional system or needs an alternative design.
2. Design. Under most state codes, daily design flow is set from bedroom count, not square footage. That flow drives tank capacity, and the soil evaluation sets the drainfield application rate and therefore its size. The designer also lays out setbacks to wells, property lines, surface water, foundations and a reserve/replacement area.
3. Permit application. Submitted to whichever office issues permits here (state agency or county/district health office, per the delegation model above), along with the design and soil work.
4. Installation and open inspection. The installer builds the system, and it is inspected before backfill while it is still open to view.
5. As-built and approval. A final drawing of what was actually built is filed once the system is approved. That as-built is the document a future owner, pumper or inspector needs, and it is what ends up in the county record.

Who can design and install a septic system

Getting septic records in Oregon

Septic records in Oregon are generally held by the county or local health jurisdiction that issued the permit, not by the state agency, and are released under the state's public records law. We have not logged the specific statute name and response deadline for Oregon yet; check with the county office listed on its records page below, or with Oregon Department of Environmental Quality (DEQ), Onsite Wastewater Management Program.

Counties in Oregon we hold records for

We hold 82,471 septic records across 25 of 36 Oregon counties. Each county page below shows exactly where its records are kept and how many we hold.

Full Oregon county-by-county index · Open the parcel map

Common questions

Who regulates septic systems in Oregon?

Oregon Department of Environmental Quality (DEQ), Onsite Wastewater Management Program. DEQ directly permits residential and small business septic systems in Curry, Jackson, and Josephine counties (through its Medford office); in Oregon's other 33 counties, DEQ contracts with local jurisdictions to administer residential and small business septic permitting.

What is the septic permit process in Oregon?

The sequence is a site and soil evaluation, a design sized from the evaluation and (under most state codes) bedroom count, a permit application, an inspection before backfill, and a final as-built filed once the system is approved. Exact numeric requirements are set by the agency's own code, not restated here.

Who can install a septic system in Oregon?

DEQ Sewage Disposal Service License (installer/pumper/maintenance-provider categories), requiring at least one individual certified under OAR 340-071-0650 (Training and Certification Requirements for System Installers and Maintenance Providers); training available via Chemeketa Community College.

How do I get septic records for a property in Oregon?

Septic records are generally held by the county or district health office that issued the permit. See our county-by-county Oregon index for the specific office and portal in each county.

Sources

• https://www.oregon.gov/deq/residential/pages/onsite.aspx
• https://www.oregon.gov/deq/residential/pages/residentialseptic.aspx
• https://www.oregon.gov/deq/residential/pages/onsite-certification.aspx
• https://www.oregon.gov/deq/Residential/Documents/OAR340-071-073.pdf

Regulatory information on this page was researched against official state agency sources and last verified 2026-08-31. It is informational only: the agency linked above is authoritative, and requirements can change. We are not lawyers, not a government body, and not affiliated with, licensed or certified by any agency named on this page.