Clean Water Act discharge permit · NPDES COR900321

BEST BLOCK, Pueblo, CO: NPDES COR900321 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
2Pollutants under a numeric limit
0Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

BEST BLOCK, held by Best Block LLC, holds NPDES permit COR900321, which discharges to Unnamed Tributary - Arkansas River. EPA’s file records it issued May 18, 2012 and expiring June 30, 2017.

BEST BLOCK, Pueblo, Colorado: Coverage under a general permit COR900321, held by Best Block LLC; Industrial stormwater; Administratively continued (past its expiration date and still in force until reissued); issued May 18, 2012, term to June 30, 2017; discharges to Unnamed tributary - Arkansas River.

Solids, total suspended: 1 limit, 2 violations of any kind, 0 effluent exceedances.
Iron, total [as Fe]: 1 limit, 2 violations of any kind, 0 effluent exceedances.

Colorado holds 1,020 Industrial stormwater coverages of this permit type in EPA’s file; 105 were issued before COR900321. Best Block LLC holds 2 permits in Colorado.

Other permits held by Best Block LLC

BEST BLOCK NORTH PLANT LITTLETON, City Of Littleton: COR900270, issued May 18, 2012

Coverages issued nearest COR900321

May 18, 2012: PORTABLE CONCRETE BATCH PLANT 73-6002(STORAGE FACILITY), Statewide, COR900295, held by W W Clyde & Co
May 18, 2012: V-15 PORTABLE ASPHALT PLANT, Statewide, COR900297, held by Elam Construction Inc
May 18, 2012: FRONTIER AIRLINES MAINTENANCE HANGAR, Denver, COR900303, held by Frontier Airlines Inc
May 18, 2012: COORS TEK MCINTYRE GOLDEN, Golden, COR900314, held by CoorsTek Inc
May 18, 2012: IHC CONCRETE BATCH PLANT 73-6003, Statewide, COR900315, held by W W Clyde & Co
May 18, 2012: DELTA PLANT, Colorado Springs, COR900322, held by Schmidt Construction Co
May 18, 2012: ENCON COLORADO, Denver, COR900324, held by Encon Colorado Co LLC
May 18, 2012: PERLITE FILTERAID PLANT, Antonito, COR900325, held by Dicaperl Minerals Corp
May 18, 2012: COORS TEK CLEAR CREEK VALLEY PLANT, Golden, COR900331, held by CoorsTek Inc
May 18, 2012: V-755 PORTABLE ASPHALT PLANT, Statewide, COR900335, held by Elam Construction Inc

BEST BLOCK among its neighbors

EPA’s permit file holds 24 discharge permits in the Outlet Fountain Creek subwatershed (HUC 110200030407), COR900321 among them. Its county holds 205, 5 of them major permits; COR900321 is a minor permit.

Other permits in the Outlet Fountain Creek subwatershed (HUC 110200030407)

00842-543,00842-254 WM FUEL STATION & REMODEL, PUEBLO, CO, Pueblo: COR426551, minor permit, permit term to March 31, 2029
C&L WATER SOLUTIONS, Englewood: COR430405, minor permit, permit term to March 31, 2029
COLORADO DEPT OF HUMAN SERVICES MS4, Pueblo: COR070095, minor permit, discharging to Fountain Creek to Arkansas River, permit term to March 9, 2013
COLORADO STATE UNIVERSITY PUEBLO MS4, Pueblo: COR070223, minor permit, discharging to Arkansas River, permit term to September 30, 2021
DILLON NORTH MAIN, Pueblo: COG081283, minor permit, discharging to Fountain Creek, permit term to May 31, 2028
E SPANISH PEAKS, Las Animas County: CO0047767, minor permit, discharging to Purgatoire River via multiple Canyons, permit term to January 31, 2015
ESA PREMIER SUITES, Pueblo: COR417660, minor permit, permit term to March 31, 2024
FOUNTAIN CREEK WATERSHED, Pueblo: COR425648, minor permit, permit term to March 31, 2029
LONGHORN STEAKHOUSE - PUEBLO CO, Pueblo: COR428818, minor permit, permit term to March 31, 2029
MURPHY USA (PUEBLO/HIGHWAY 47 & DILLON), Pueblo: COR431071, minor permit, permit term to March 31, 2029

Identity

Facility as filed	BEST BLOCK
Permittee as filed	Best Block LLC
NPDES ID	COR900321
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Coverage under a general permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Program	Industrial stormwater
Issued	May 18, 2012
Expiration date	June 30, 2017
Address	Pueblo, CO 81003
Receiving water	Unnamed tributary - Arkansas River
Receiving water impaired	303(D) Listed
Subwatershed	Outlet Fountain Creek (HUC 110200030407)

Effluent limits and exceedances

2Pollutants on file
2Under a numeric limit
2With a violation of any kind
0With an effluent exceedance

An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.

Pollutant or measure	Limits	Violations, any kind	Effluent exceedances	Latest exceedance	Largest exceedance, as filed
Solids, total suspended	1	2	0
Iron, total [as Fe]	1	2	0

EPA’s effluent violation file records no exceedance of a numeric limit for NPDES COR900321.

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES COR900321.

Inspections

EPA’s inspection file holds no inspection for NPDES COR900321.

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 COR900321.

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

This public-records page covers the Clean Water Act discharge permit NPDES COR900321 held by Best Block LLC for the BEST BLOCK facility in Pueblo, CO, which discharges to an unnamed tributary of the Arkansas River. The page lists the permit as administratively continued and a minor discharger, with 2 pollutants on file, 2 under a numeric limit, and 2 with a violation.