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Clean Air Act stationary source · ICIS-AIR AZMCA004013X004400

SUMCO SOUTHWEST CORPORATION, Maricopa County, AZ: Clean Air Act compliance record, inspections, violations, penalties

SUMCO SOUTHWEST CORPORATION, at 19801 N TATUM BLVD, Maricopa County in Maricopa County, Arizona, is an operating synthetic minor source of air pollution on EPA’s ICIS-AIR register. EPA’s file records its current violation status (ICIS-AIR’s high-priority violation field) as “Violation w/in 1 Year”. Maricopa County is on EPA’s Green Book list of areas that do not meet a national air quality standard. The status and classification are as EPA’s facility file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the source’s current standing, quarter by quarter.

Identity

Facility as filedSUMCO SOUTHWEST CORPORATION
ICIS-AIR IDAZMCA004013X004400
EPA facility registry ID110000470455
Operating statusOperating
Emissions classificationSynthetic minor source
Current violation status (ICIS-AIR high-priority violation field)Violation w/in 1 Year
Address19801 N TATUM BLVD, Maricopa County, AZ 85050
CountyMaricopa County
In a nonattainment countyYes (EPA Green Book)
Industry (NAICS)Computer and electronic product manufacturing (NAICS 3344)
SIC code3674
EPA region09
Local air agencyMaricopa County Air Pollution Control Agency (Grantee)

Cited to the EPA ICIS-AIR facility file (ECHO download).

Programs and pollutants

Velarion’s copy of EPA’s ICIS-AIR download does not include its program, pollutant and Title V certification files, so this page does not list the Clean Air Act programs SUMCO SOUTHWEST CORPORATION is under or the pollutants it is permitted for. The programs each evaluation and violation below was recorded under are shown with it. EPA’s free Detailed Facility Report lists both.

Compliance evaluations

DateWhat EPA recordedAgencyPrograms
July 20, 2026PCE Off-SiteLocalFederally-Enforceable State Operating Permit - Non Title V; 40 CFR Part 63 Area Sources; New Source Performance Standards (Non-Major); State or Local rule or regulation that is not federally-enforceable
February 26, 2026FCE On-SiteLocalFederally-Enforceable State Operating Permit - Non Title V; 40 CFR Part 63 Area Sources; New Source Performance Standards (Non-Major); State or Local rule or regulation that is not federally-enforceable
January 9, 2026PCE Off-SiteLocalFederally-Enforceable State Operating Permit - Non Title V; 40 CFR Part 63 Area Sources; New Source Performance Standards (Non-Major); State or Local rule or regulation that is not federally-enforceable
August 13, 2025PCE Off-SiteLocalFederally-Enforceable State Operating Permit - Non Title V; MACT Standards (40 CFR Part 63); New Source Performance Standards; State or Local rule or regulation that is not federally-enforceable
February 14, 2025PCE Off-SiteLocalFederally-Enforceable State Operating Permit - Non Title V; MACT Standards (40 CFR Part 63); New Source Performance Standards; State or Local rule or regulation that is not federally-enforceable
November 14, 2024FCE On-SiteLocalFederally-Enforceable State Operating Permit - Non Title V; MACT Standards (40 CFR Part 63); New Source Performance Standards; State or Local rule or regulation that is not federally-enforceable
August 22, 2024PCE On-SiteLocalFederally-Enforceable State Operating Permit - Non Title V; New Source Performance Standards
October 11, 2022FCE On-SiteLocalFederally-Enforceable State Operating Permit - Non Title V; MACT Standards (40 CFR Part 63); New Source Performance Standards
October 11, 2022FCE On-SiteLocalFederally-Enforceable State Operating Permit - Non Title V; MACT Standards (40 CFR Part 63); New Source Performance Standards; State or Local rule or regulation that is not federally-enforceable
November 19, 2020PCE On-SiteLocalMACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
November 19, 2020FCE On-SiteLocalMACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
December 5, 2018PCE On-SiteLocalMACT Standards (40 CFR Part 63); New Source Performance Standards
December 5, 2018FCE On-SiteLocalMACT Standards (40 CFR Part 63); New Source Performance Standards
March 28, 2018PCE On-SiteLocalMACT Standards (40 CFR Part 63); New Source Performance Standards
March 28, 2018FCE On-SiteLocalMACT Standards (40 CFR Part 63); New Source Performance Standards
July 10, 2017PCE On-SiteLocalMACT Standards (40 CFR Part 63); New Source Performance Standards
July 10, 2017FCE On-SiteLocalMACT Standards (40 CFR Part 63); New Source Performance Standards

Violations

A high-priority violation (HPV) is the most serious class of Clean Air Act non-compliance an agency records; a federally reportable violation (FRV) is the next step down. Each row is one determination as EPA’s violation history files it.

DateWhat EPA recordedAgencyPrograms
May 13, 2026Earliest FRV determinationLocalFederally-Enforceable State Operating Permit - Non Title V
July 12, 2024Earliest FRV determinationLocalFederally-Enforceable State Operating Permit - Non Title V

Enforcement and penalties

0 formal enforcement actions since January 1, 2017, 0 of them with a penalty filed above zero. Each penalty is shown as EPA’s formal action file states it; “Not stated” means the file gives no figure, and $0 is a disclosed zero.

Informal enforcement

DateWhat EPA recordedAgency
June 12, 2026Warning LetterLocal
July 12, 2024Warning LetterLocal

Stack tests

DateWhat EPA recordedAgency
October 7, 2025PassLocal
August 20, 2024PassLocal
April 16, 2024FailLocal
March 23, 2023PassLocal
March 22, 2023PassLocal
March 21, 2023PassLocal
May 5, 2022PassLocal
May 2, 2017PassLocal

Cited to the EPA ICIS-AIR evaluation, violation, stack test and enforcement files (ECHO download), events dated January 1, 2017 or later as loaded; up to 50 rows of each shown, newest first.

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How we handle your data → Privacy

EPA publishes a free Detailed Facility Report for every source on ECHO: its compliance status quarter by quarter, its evaluations, and its violations, enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter EPA facility registry ID 110000470455 there.

Nearby on the register

Figures from EPA’s ICIS-AIR download, loaded September 14, 2026.