EPA Greenlights Missouri's Tweaked Petroleum Emission Controls
Published Date: 4/23/2026
Proposed Rule
Summary
The EPA is proposing to approve updates to Missouri’s rules for controlling pollution from storing, loading, and transferring petroleum liquids in the St. Louis area. These changes simplify rules, clarify language, and align with Kansas City’s standards without adding extra costs or delays. Businesses must note that comments on this proposal are due by May 26, 2026.
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Analyzed Economic Effects
4 provisions identified: 4 benefits, 0 costs, 0 mixed.
Permit Removed for Vapor-Recovery Modifications
The revision adds a streamlined process for modifications to vapor recovery systems at gasoline dispensing facilities and eliminates the associated permitting requirement. Gas stations in the St. Louis area making such modifications would follow the new streamlined procedure instead of obtaining the prior permit.
Small-tank Applicability Raised to 550 gal
The rule changes the smaller tank applicability from 500–1,000 gallon tanks to 550–1,000 gallon tanks for petroleum liquid storage in the St. Louis metropolitan area. That means tanks in the 500–549 gallon range are no longer covered by this provision of 10 CSR 10-5.220.
St. Louis Rule Aligned with Kansas City
The revisions make the St. Louis rule consistent with a similar rule applicable to the Kansas City area that regulates the same types of facilities. Operators subject to rules in both areas will see the St. Louis provision harmonized with the Kansas City standard.
EPA: No Significant Economic Impact Found
EPA states that approving these state rule revisions does not impose additional federal requirements beyond state law and is certified as not having a significant economic impact on a substantial number of small entities under the Regulatory Flexibility Act. EPA also proposes the revisions do not interfere with the State's ability to attain or maintain the National Ambient Air Quality Standards (NAAQS).
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