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Regulatory and Permitting Information Desktop Toolkit

Idaho Underground Storage Tank Permit (18-ID-a)

The Idaho Department of Environmental Quality (DEQ) requires notification under IDAPA 58.01.07 if the developer intends to use underground storage tanks (USTs). The notification serves as a measure to protect against ground water contamination.


Underground Storage Tank Permit Process

18-ID-a.1 - Notification Form

The developer must provide written notice on forms supplied by the DEQ 30 days prior to the installation of a new system and 24 hours before installing a replacement system.

The notice must include whether the new or replacement installation is within one thousand feet of an existing public water system or potable drinking well. If the owner and installer certify that the installation is not within one thousand feet of an existing public water system or potable drinking water well, the owner, operator, of designee thereof, must provide and maintain documentation showing that the party conducted a reasonable investigation of the water systems and drinking water wells. A reasonable investigation must include a search of the records of:

  • The public or private water service provider in the area which the new or replacement installation is

located (if any);

  • The city or county in which the new or replacement installation is located;
  • The Idaho Department of Water Resources; and
  • The Idaho Department of Environmental Quality.


Requirements for Petroleum UST Systems

Owners, operators, and installers of a new or replacement ust system must comply with the following requirements:

  • Each new petroleum underground storage tank, or piping connected to any such new tank, installed after February 23, 2007, or any existing petroleum underground storage tank, or existing piping connected to such existing tank, that is replaced after February 23, 2007, must have secondary containment and be monitored for leaks if the new or replaced petroleum underground storage tank or piping is within one thousand feet of any existing public water system or any existing potable drinking water well. At a minimum, secondary containment systems must be designed, constructed, and installed to contain regulated substances released from the tank system until they are detected and removed, prevent the release of regulated substances to the environment at any time during the operational life of the petroleum underground storage tank system, and be checked for evidence of a release at least every thirty days. The following conditions are excluded:
i. Suction piping that meets the requirements of 40 CFR 280.41(b)(2)(i) through (v);
ii. Piping that manifolds two or more petroleum underground storage tanks together;
iii. Existing piping to which new piping is connected to install a dispenser; and
iv. Tanks identified in 40 CFR 280.10(b).


  • If within one year the owner installs a potable drinking water well at the new facility that is within one thousand feet of the petroleum underground tanks, piping, or motor fuel dispenser system as part of the new UST installation, secondary containment and under-dispernser containment is required, regardless if the well is installed before or after the tanks, piping, or dispenser.
  • Each installation of a new motor fuel dispenser system must include under-dispenser spill containment if the new dispenser is within one thousand feet of an existing public water system or potable drinking water well.

In the case of a replacement of an existing petroleum UST or piping connected to a UST, the above rules and regulations from IDAPA 58.01.07.100.03 apply only to the specific petroleum UST or piping being replaced and not to other petroleum USTs and connected piping.




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Edit Idaho Department of Environmental Quality
Underground Storage Tank and Hazardous Waste Permitting Contact
208.373.0547
robertabbazabbabullock@deqabbazabbaidahoabbazabbagov
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