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Clean Water Act discharge permit · NPDES MAR05CU81

ONYX SPECIALTY PAPERS LLC, South Lee, MA: NPDES MAR05CU81 discharge permit, effluent exceedances, inspections, penalties

ONYX SPECIALTY PAPERS LLC, held by MW CUSTOM PAPERS LLC, holds NPDES permit MAR05CU81. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

What the register holds for ONYX SPECIALTY PAPERS LLC: its NPDES ID, its permit type and status, its its address in South Lee, Massachusetts. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES MAR05CU81.

Identity

Facility as filedONYX SPECIALTY PAPERS LLC
Permittee as filedMW CUSTOM PAPERS LLC
NPDES IDMAR05CU81
Permit statusPending
Permit typeCoverage under a general permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
AddressSouth Lee, MA 01260
Receiving water impaired303(D) Listed
SubwatershedKonkapot Brook-Housatonic River (HUC 011000050107)
Other EPA IDs (FRS)RCRA handler MAD002079556; ICIS-AIR source MA0000002511700015

Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.

Effluent limits and exceedances

EPA’s limits and effluent violation files hold no pollutant row for NPDES MAR05CU81.

Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.

Inspections, violations and enforcement

EPA’s single-event violation file, as loaded, holds no violation for NPDES MAR05CU81.

Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.

Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.

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One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, MAR05CU81.

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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID MAR05CU81 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.

What this page shows

Among the 18 general permit coverages in Berkshire County on EPA's NPDES register, ONYX SPECIALTY PAPERS LLC is one of 11 NPDES permits in the Konkapot Brook-Housatonic River subwatershed, and 38.9% of the county's general permit coverages carry a violation on file. This permit, filed under MW CUSTOM PAPERS LLC and currently pending, has no pollutants under a numeric limit and no pollutants with an effluent exceedance.