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U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

FY 2024 User Fee Assessments - Underground Natural Gas Storage (UNGS) Facilities

This notice announces that the Fiscal Year 2024 user fee assessments for underground natural gas storage facility operators were e-mailed on April 16, 2024.

Assessments must be paid in full, either by check (payable to U.S. Department of Transportation-PHMSA) or via the website at Please follow the website instructions to make your UNGS facility user fee payment online.

To ensure proper crediting when paying by check, please include the entire bill number on your check or return a copy of the bill with your payment. For late payments, you will be charged 4% annual interest, 6% annual penalty charge, and a $12.00 per month administrative fee. (See §3717, Title 31, U.S. Code).

Mail Payments to:

PO BOX 25770

For further information please contact the User Fee Manager.

User fees for underground natural gas storage facility operators are based on the total number of wells for all of your gas storage facilities as reported to PHMSA on form 7100.4-1. Operators at tier 1/2, tier 2/3, tier 4/5, and tier 6/7 boundaries were randomly selected for inclusion in the lower tier.


Total Number of Wells Rate Per Operator
4 or less $ 10,769
4 to 5 $ 21,538
5 to 9 $ 26,923
10 to 16 $ 32,308
16 to 23 $ 43,077
24 to 40 $ 53,846
40 to 66 $ 64,615
67 to 106 $ 70,000
107 to 350 $ 87,500
more than 350 $ 145,834


The Department of Transportation's Pipeline and Hazardous Materials Safety Administration (PHMSA) under Section 12 of the Protecting our Infrastructure of Pipelines and Enhancing Safety (PIPES) Act of 2016 was mandated to issue regulations for underground natural gas storage facilities, impose user fees on operators of these facilities, and prescribe procedures to collect those fees for the newly established Underground Natural Gas Storage Facility Safety Account in the Pipeline Safety Fund.

Note: User fees will be due 60 days after the date of the assessment. Interest, penalties, and administrative charges will be assessed on delinquent debts in accordance with 31 U.S.C. 3717.