EPA Hands Missouri Reins on Ammonia Safety Oversight
Published Date: 4/29/2026
Rule
Summary
The EPA just gave Missouri the green light to manage safety rules for agricultural anhydrous ammonia at certain facilities starting May 29, 2026. This means Missouri will handle some chemical accident prevention, while EPA keeps control over other chemicals and facilities. This change helps Missouri take charge locally without extra costs or delays for businesses.
Analyzed Economic Effects
4 provisions identified: 3 benefits, 0 costs, 1 mixed.
Missouri Takes Over RMP Enforcement
If you operate an agricultural anhydrous ammonia facility in Missouri, the Missouri Department of Natural Resources (MoDNR) will have primary authority to implement and enforce parts of the Risk Management Program (RMP) starting May 29, 2026. MoDNR will handle on-site inspections, recordkeeping reviews, audits, compliance assistance, outreach, and enforcement for those agricultural ammonia facilities.
Which Facilities Must Comply
A stationary source in Missouri that uses, stores, or sells agricultural anhydrous ammonia and meets the threshold quantity of 10,000 pounds must comply with Missouri regulation 10 CSR 10-6.255 (Chemical Accident Prevention for Agricultural Anhydrous Ammonia). Those state regulations took effect February 28, 2025 and have been incorporated by reference into federal regulations.
EPA Retains Authority for Other Chemicals
The EPA keeps authority over any anhydrous ammonia that does not meet the State's definition of agricultural anhydrous ammonia and over the RMP for any other regulated chemicals at these facilities. The EPA also retains certain authorities such as petitions under 40 CFR 68.120 and may continue outreach, enforcement, investigations, and information gathering.
No New Small-Business Burden Certified
The EPA certified that this delegation merely allows the State to implement requirements already in the federal RMP and that it does not have a significant economic impact on a substantial number of small entities under the Regulatory Flexibility Act. The action also does not add new information collection burdens or unfunded mandates.
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