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Water Quality

Underground Injection Control (UIC) Program

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Underground Injection Control Water Pollution Control Facilities Permits

Oregon’s UIC program regulates fluid discharges to the subsurface by issuing permits or authorizations to ensure that injection does not contaminate underground sources of drinking water. The UIC program has developed discharge permits for the following: Class II Oil & Natural Gas Permits, Class V Stormwater Permits, and Class V Geothermal Permits. Because the permits authorize a subsurface discharge to ground (i.e., no discharge to navigable waters), they are known as Water Pollution Control Facilities permits.

Class II Oil & Natural Gas Permits

Class II UICs inject fluids that are associated with oil and natural gas production and recovery. Most of the injected fluid is brine produced when oil and gas are extracted from the earth.

One Class II UIC permit has been issued in Oregon (permit number 101690). The permit authorizes injection of formation salt water produced at the Mist Gas Field in Mist, Oregon. A copy of this permit is available from DEQ’s online permit repository.

Class V Stormwater Permits

Class V stormwater UICs inject stormwater runoff from roofs, streets, and parking lots. Most Class V stormwater UICs are authorized by rule when they meet the eligibility criteria established under Oregon’s Administrative Rules for UICs. However, some UICs are authorized by permit if the UICs do not meet the conditions for authorization by rule, or if authorization by rule is cost-prohibitive.

DEQ only authorizes UICs by permit if the permittee can demonstrate that the UICs do not endanger existing or future underground sources of drinking water (see 40 CFR 144.82), and do not allow movement of fluid containing contaminants into underground sources of drinking water, if the presence of that contaminant may cause violation of a Maximum Contaminant Level or otherwise adversely affect the health of persons (see 40 CFR 144.12).

DEQ’s Class V stormwater permits allow area permit coverage, meaning that the permits authorize all UICs that are owned by the permittee. There are two options for authorizing UICs by permit: individual permit or general permit.

  • Individual Permit
  • General Permit
    DEQ now offers a general permit for entities that own or operate less than 50 UICs. DEQ staff will help new applicants and current permit holders determine whether their UIC system should be covered by an individual or general permit.
    For more information about this permit, please visit the UIC Contacts page.

Class V Geothermal Permits

Class V Geothermal UICs inject fluids produced during geothermal exploration or production into the same or comparable geothermal reservoir. Short-term geothermal exploration operations require authorization under the 1900B general permit, and long-term geothermal reservoir production requires authorization under an individual UIC permit.

One Class V Geothermal individual UIC permit has been issued in Oregon (permit number 119576). The permit authorizes injection of spent geothermal fluids at the Neal Hot Springs Geothermal Project. A copy of this permit is available from DEQ’s online permit repository.

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For more information about DEQ's Underground Injection Control Program, please see the UIC Contacts page.

Oregon Department of Environmental Quality
Headquarters: 811 SW Sixth Ave., Portland, OR 97204-1390
Phone: 503-229-5696 or toll free in Oregon 1-800-452-4011
Oregon Telecommunications Relay Service: 1-800-735-2900  FAX: 503-229-6124

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