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Clean Water Act discharge permit · NPDES NCG020187

CENTRAL ROCK QUARRY, Greensboro, NC: NPDES NCG020187 discharge permit, effluent exceedances, inspections, penalties

CENTRAL ROCK QUARRY, held by Martin Marietta Materials Inc, holds NPDES permit NCG020187. EPA’s file records it issued July 1, 2021 and expiring June 30, 2025.

CENTRAL ROCK QUARRY, Greensboro, North Carolina: Coverage under a general permit NCG020187, held by Martin Marietta Materials Inc; Industrial stormwater; Administratively continued (past its expiration date and still in force until reissued); issued July 1, 2021, term to June 30, 2025.

North Carolina holds 3,311 Industrial stormwater coverages of this permit type in EPA’s file; 1,428 were issued before NCG020187. Martin Marietta Materials Inc holds 56 permits in North Carolina.

Other permits held by Martin Marietta Materials Inc

Coverages issued nearest NCG020187

CENTRAL ROCK QUARRY among its neighbors

EPA’s permit file holds 1 discharge permits in the Rock Creek subwatershed (HUC 030300020307), NCG020187 among them. Its county holds 175, 0 of them major permits; NCG020187 is a minor permit.

What the register holds for CENTRAL ROCK QUARRY: its NPDES ID, its permit type and status, its dates, its address in Greensboro, North Carolina. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES NCG020187.

Identity

Facility as filedCENTRAL ROCK QUARRY
Permittee as filedMartin Marietta Materials Inc
NPDES IDNCG020187
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeCoverage under a general permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
ProgramIndustrial stormwater
IssuedJuly 1, 2021
Expiration dateJune 30, 2025
AddressGreensboro, NC 27406
Receiving water impaired303(D) Listed
SubwatershedRock Creek (HUC 030300020307)
SIC1423 – Crushed And Broken Granite
Other EPA IDs (FRS)RCRA handler NCD986204675; ICIS-AIR source NC0000003704100406

Effluent limits and exceedances

EPA’s limits and effluent violation files hold no pollutant row for NPDES NCG020187.

Inspections, violations and enforcement

EPA’s single-event violation file, as loaded, holds no violation for NPDES NCG020187.

Inspections

EPA’s inspection file holds no inspection for NPDES NCG020187.

Formal enforcement and penalties

0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.

Informal enforcement

EPA’s informal enforcement file holds no action for NPDES NCG020187.

Watch this permit

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Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

What this page shows

CENTRAL ROCK QUARRY is one of 124 storm water industrial permits on EPA's NPDES register in Guilford County, and it is the only NPDES permit in the Rock Creek subwatershed (HUC 030300020307). Of those 124 Guilford County storm water industrial permits, 46.0% were issued earlier than this one, and 0.0% carry a violation on file, which matches this permit's record of zero pollutants with an effluent exceedance.