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Clean Air Act stationary source · ICIS-AIR PA000254888

HEIDELBERG MTLS NORTHEAST PA /GLEN MILLS QUARRY, Glen Mills, PA: Clean Air Act compliance record, inspections, violations, penalties

HEIDELBERG MTLS NORTHEAST PA /GLEN MILLS QUARRY, at 523 FORGE RD, Glen Mills in Delaware County, Pennsylvania, 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”. Delaware 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 filedHEIDELBERG MTLS NORTHEAST PA /GLEN MILLS QUARRY
ICIS-AIR IDPA000254888
EPA facility registry ID110001061225
Operating statusOperating
Emissions classificationSynthetic minor source
Current violation status (ICIS-AIR high-priority violation field)Violation w/in 1 Year
Address523 FORGE RD, Glen Mills, PA 19342-8831
CountyDelaware County
In a nonattainment countyYes (EPA Green Book)
Industry (NAICS)Mining and quarrying (NAICS 2123)
SIC code1423
EPA region03

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

Programs and pollutants

Velarion’s copy of EPA’s ICIS-AIR download does not yet include its program, pollutant and Title V certification files, so this page does not list the Clean Air Act programs HEIDELBERG MTLS NORTHEAST PA /GLEN MILLS QUARRY 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
June 29, 2026FCE On-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
June 16, 2026PCE On-Site Monitoring/SamplingStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
May 14, 2026PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
May 19, 2025PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
December 13, 2024PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
October 25, 2024PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
April 23, 2024PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
April 12, 2024PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
April 1, 2024PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
March 4, 2024PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
January 29, 2024FCE On-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
January 8, 2024PCE On-Site Monitoring/SamplingStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
April 26, 2023PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
August 29, 2022FCE On-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
April 6, 2022PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
March 22, 2022PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
December 29, 2021PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
December 1, 2021PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
June 21, 2021PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
June 14, 2021PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
April 22, 2020PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
April 20, 2020PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
October 30, 2019PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
October 25, 2019PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
October 17, 2019PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
October 11, 2019PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
July 24, 2019PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
July 10, 2019PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
May 3, 2019PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
May 2, 2019PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
April 11, 2019PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
March 6, 2019PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
January 24, 2019PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
October 24, 2018FCE On-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
August 2, 2018PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
March 29, 2018PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
December 27, 2017PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
November 3, 2017PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
September 21, 2017PCE On-Site Monitoring/SamplingStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
September 12, 2017PCE On-Site Monitoring/SamplingStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
August 9, 2017FCE On-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
March 29, 2017PCE Off-SiteStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality 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
June 16, 2026Earliest FRV determinationStateState Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
December 13, 2024Earliest FRV determinationStateState Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
October 25, 2024Earliest FRV determinationStateState Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
January 29, 2024Earliest FRV determinationStateState Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
June 21, 2021Earliest FRV determinationStateState Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
July 10, 2019Earliest FRV determinationStateState Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
April 11, 2019Earliest FRV determinationStateState Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
September 21, 2017Earliest FRV determinationStateState Implementation Plan for National Primary and Secondary Ambient Air Quality Standards

Enforcement and penalties

3 formal enforcement actions since January 1, 2017, 3 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.

DateWhat EPA recordedAgencyPenalty, as filed
December 6, 2024Administrative OrderState$59,558
May 23, 2022Administrative OrderState$2,400
December 20, 2019Administrative OrderState$9,175

Informal enforcement

DateWhat EPA recordedAgency
July 7, 2026Notice of ViolationState
December 18, 2024Notice of ViolationState
February 12, 2024Notice of ViolationState
June 25, 2021Notice of ViolationState
April 18, 2019Notice of ViolationState
October 5, 2017Notice of ViolationState

Stack tests

DateWhat EPA recordedAgency
August 3, 2017PassState

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 110001061225 there.

Nearby on the register

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