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ICIS-AIR SD0000004600501031

HMMI, LLC (FORMERLY HORIZONTAL MACHINING & MANUFACTURING, INC.), Huron, SD: Clean Air Act compliance record, inspections, violations, penalties

HMMI, LLC (FORMERLY HORIZONTAL MACHINING & MANUFACTURING, INC.) is on EPA’s ICIS-AIR register at 640 ARIZONA NORTHWEST, Huron in Beadle County, South Dakota: operating status operating, emissions classification synthetic minor source, current violation status “No Violation Identified”.

What stands out

  • The newest of the 5 events on file is a compliance evaluation dated May 28, 2026.
  • Its events on file run from August 14, 2018 through May 28, 2026.
  • All 4 of its compliance evaluations on file are full compliance evaluations.
  • The register holds 12 air-emissions sources in Beadle County, South Dakota.

Every line is computed by formula from the record’s stored figures; nothing is estimated.

Identity

Facility as filedHMMI, LLC (FORMERLY HORIZONTAL MACHINING & MANUFACTURING, INC.)
ICIS-AIR IDSD0000004600501031
EPA facility registry ID110070156271
Operating statusOperating
Emissions classificationSynthetic minor source
Current violation status (HPV field)No Violation Identified
Address640 ARIZONA NORTHWEST, Huron, SD 57350
CountyBeadle County
In a nonattainment countyNo (EPA Green Book)
Industry (NAICS)Machinery manufacturing (NAICS 3339)
EPA region08

Programs and pollutants

The program, pollutant and Title V files are not loaded: what this page covers.

Compliance evaluations

DateWhat EPA recordedAgencyPrograms
May 28, 2026FCE On-SiteStateFederally-Enforceable State Operating Permit - Non Title V
August 20, 2024FCE On-SiteStateState Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
September 20, 2022FCE On-SiteStateState Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
August 14, 2018FCE On-SiteStateMACT Standards (40 CFR Part 63)

Violations

What high-priority and federally reportable violations mean.

DateWhat EPA recordedAgencyPrograms
August 20, 2024Earliest FRV determinationStateState Implementation Plan for National Primary and Secondary Ambient Air Quality Standards

Enforcement and penalties

0 of the formal enforcement actions carry a penalty filed above zero. How a penalty is shown.

Informal enforcement

EPA’s informal action file holds no notice or warning for ICIS-AIR SD0000004600501031 since January 1, 2017.

Stack tests

EPA’s stack test file holds no test at ICIS-AIR SD0000004600501031 since January 1, 2017.

Watch HMMI, LLC (FORMERLY HORIZONTAL MACHINING & MANUFACTURING, INC.)

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Billing

Privacy

Free from EPA: Detailed Facility Report, ECHO Notify (registry ID 110070156271).

Other air sources in South Dakota beside HMMI, LLC (FORMERLY HORIZONTAL MACHINING & MANUFACTURING, INC.)

EPA ICIS-AIR download, loaded September 14, 2026.