Region 10 Settles with Silverhawk Aviation Services, LLC, for Clean Water Act (CWA) Violations
(Caldwell, ID)
On January 7, 2022, EPA Region 10 filed an industrial non-filer expedited settlement agreement
resolving CWA NPDES violations by Silverhawk Aviation Services, LLC for their operation at the City
of Caldwell's Industrial Airport in Caldwell, Idaho. EPA Region 10 determined Silverhawk Aviation
Services, LLC required coverage under the EPA Stormwater Multi Sector General Permit (MSGP).
EPA Region 10 made this determination following an October 2019, inspection conducted by Idaho
Department of Environmental Quality (IDEQ) on behalf of EPA, which also resulted in EPA Region 10
issuing an administrative compliance order on consent with the City of Caldwell. EPA Region 10
alleged that Silverhawk Aviation Services, LLC violated the NPDES program of the CWA at the
Airport by failing to obtain coverage under EPA?s MSGP. Silverhawk Aviation Services, LLC has
obtained coverage under IDEQ's industrial stormwater permit and began implementing its
requirements. The estimated cost of injunctive relief is $600. Actions taken by the facility should
reduce discharged pollutants from industrial activities associated with airports into receiving waters.
Respondent also agreed to pay a penalty of $2,500.