Clean Water Act discharge permit · NPDES MAR1005ZI

WESTLAKE ROYAL BUILDING PRODUCTS - WESTFIELD, Westfield, MA: NPDES MAR1005ZI discharge permit, effluent exceedances, inspections, penalties

EffectivePermit status
MinorDischarger class
0Pollutants under a numeric limit
0Pollutants with an effluent exceedance

WESTLAKE ROYAL BUILDING PRODUCTS - WESTFIELD, held by Westlake Royal Building Products - Westfiled, holds NPDES permit MAR1005ZI. EPA’s file records it issued December 16, 2025 and expiring February 16, 2027. 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 WESTLAKE ROYAL BUILDING PRODUCTS - WESTFIELD: its NPDES ID, its permit type and status, its dates, its address in Westfield, Massachusetts. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES MAR1005ZI.

Identity

Facility as filed	WESTLAKE ROYAL BUILDING PRODUCTS - WESTFIELD
Permittee as filed	Westlake Royal Building Products - Westfiled
NPDES ID	MAR1005ZI
Permit status	Effective
Permit type	Coverage under a general permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Program	Construction stormwater
Issued	December 16, 2025
Expiration date	February 16, 2027
Issuing agency	U.S. EPA
Address	Westfield, MA 01085
Subwatershed	Powerdmill Brook-Westfield River (HUC 010802060305)

Cited to the EPA ICIS-NPDES permit file (ECHO download).

Effluent limits and exceedances

0Pollutants on file
0Under a numeric limit
0With a violation of any kind
0With an effluent exceedance

EPA’s limits and effluent violation files hold no pollutant row for NPDES MAR1005ZI.

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

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES MAR1005ZI.

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.

Watch this permit

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, MAR1005ZI.

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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 MAR1005ZI there.

Nearby on the register

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

The WESTLAKE ROYAL BUILDING PRODUCTS - WESTFIELD storm water construction permit, MAR1005ZI, is one of 24 such permits in Westfield on EPA's NPDES register, and 0.0% of those 24 carry a violation on file. Within the Powerdmill Brook-Westfield River subwatershed, it is one of 35 NPDES permits, and 78.3% of the 23 storm water construction permits in Westfield, this one included, were issued earlier than its December 16, 2025 issue date.