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Nustar NH3 Pipeline 2022

Site Contact:
Adam Adams
On Scene Coordinator


Site Location:
33.0875 N 92.5250 W
El Dorado, AR 71730
NRC#: 1329850

EPA was notified (NRC #1329850) at approximately 1830 hours on February 27, 2022 of an Anhydrous Ammonia release near El Dorado, AR from an underground pipeline, owned and operated by Nustar Energy, the Potentially Responsible Party (PRP). The PRP received an indication of loss of pressure on the pipeline and upon further investigation determined there was a release of anhydrous ammonia into the ground and into a nearby creek. Most of the release material evaporated into the air. The cause of the release is currently unknown. The PRP shut down the pipeline and have located the potential release point. Ten homes were evacuated between midnight and 2 am by the Union County Sheriff’s Department. One homeowner relocated approximately 20 horses. Nustar mobilized to respond to the incident and secure the pipeline release. NuStar is conducting air monitoring at the pipeline repair location and in the surrounding vicinity.

Following the morning update of the voluntary evacuations, OSC Adam Adams and EPA START contractors were activated at 1100 on February 28, 2022 to respond.