Clean Water Act discharge permit · NPDES 09R10I01A

P2301 HSC-25 HANGAR COMPLEX, Andersen Air Force Base, GU: NPDES 09R10I01A discharge permit, effluent exceedances, inspections, penalties

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

P2301 HSC-25 HANGAR COMPLEX, held by Environmental Chemical Corporation, holds NPDES permit 09R10I01A. EPA’s file records it issued February 3, 2026 and expiring February 16, 2027.

P2301 HSC-25 HANGAR COMPLEX, Andersen Air Force Base, Guam: Coverage under a general permit 09R10I01A, held by Environmental Chemical Corporation; Construction stormwater; Effective; issued February 3, 2026, term to February 16, 2027, by U.S. EPA.

Guam holds 190 Construction stormwater coverages of this permit type in EPA’s file; 150 were issued before 09R10I01A. Environmental Chemical Corporation holds 3 permits in Guam.

Other permits held by Environmental Chemical Corporation

P103 WATER WELL FIELD, Yigo: GUR10004B, issued April 26, 2022
POL OPERATIONS FACILITY BUILDING 26203, Yigo: GUR100080, issued March 11, 2025

Coverages issued nearest 09R10I01A

January 20, 2026: FY25 MDA 694-1 PDI: GUAM DEFENSE SYSTEM EIAMD, Yigo, 09R10I00V, held by Black Constuction Corporation
January 20, 2026: NEW EVIDENCE STORAGE FOR GPD AT YIGO (DESIGN-BUILD), Yigo, 09R10I013, held by Mega United Corp. Ltd.
January 20, 2026: P-614 JOINT CONSOLIDATED COMMUNICATIONS CENTER, Yigo, 09R10I016, held by Nan Inc.
January 20, 2026: FY 2025 MILCON PROJECT P-411 YOUTH CENTER, Yigo, 09R10I019, held by SLSCO
January 29, 2026: UKUDU WORKFORCE HOUSING, Dededo, 09R10I00Z, held by Core Tech International Corporation
February 6, 2026: PROPOSED TIRE RECYCLING, METAL STORAGE AND PROCESSING, Mangilao, 09R10I015, held by Wenefredo E. Gallega
February 9, 2026: TIRE RECYCLING, METAL STORAGE AND PROCESSING, Barrigada, GUR10006X, held by Mr. CY Leung
February 17, 2026: FY24 PROJECT APRA HARBOR WATERFRONT REPAIRS: POLARIS POINT, Santa Rita, 09R10I01D, held by TPC-NAN a Joint Venture
February 24, 2026: OKA SUBDIVISION, Tamuning, GUR100083, held by JMC Equipment
February 24, 2026: MSW LANDFILL CELLS 1&2 REPAIR ANDERSEN AIR FORCE BASE, Yigo, GUR100084, held by CMS Corporation

P2301 HSC-25 HANGAR COMPLEX among its neighbors

EPA’s permit file holds 106 discharge permits in the Mataguac Spring-Frontal Pacific Ocean subwatershed (HUC 220100000100), 09R10I01A among them.

Other permits in the Mataguac Spring-Frontal Pacific Ocean subwatershed (HUC 220100000100)

ACHO LATTE, Dededo: GUR10006Z, minor permit, permit term to February 16, 2027
B31GS AISR-DT MET LARGE FIXED ANTENNA (LFA) PROJECT, Dededo: GUR10006L, minor permit, permit term to February 16, 2027
BANK OF GUAM NORTHERN (FULL SERVICE) BRANCH, Dededo: 09R10I007, minor permit, permit term to February 16, 2027
BEQ J-031 & J-033, Yigo: GUR10002B, minor permit, permit term to February 15, 2022
CLEARING AND GRADING OF LOT 5040-3, Dededo: GUR10008M, minor permit, permit term to February 16, 2027
CLEARING AND TEMPORARY STOCKPILING AT LOT 5316-R3NEW-3, ROUTE 3 DEDEDO GUAM, Dededo: GUR100052, minor permit, permit term to February 16, 2027
COAST 360 FCU UPPER TUMON BRANCH, Upper Tumon: GUR10004E, minor permit, permit term to February 16, 2027
CONSTRUCT READY-MIX CONCRETE BATCH PLANT, LOT 5035-R8, Dededo: GUR10005G, minor permit, permit term to February 16, 2027
CONTRACT N62742-21-D-1325, J-008 FIRE STATION, MARINE CORPS BASE, GUAM, Dededo: GUR10003O, minor permit, permit term to February 15, 2022
FY 2025 MILCON PROJECT P-411 YOUTH CENTER, Yigo: 09R10I019, minor permit, permit term to February 16, 2027

What the register holds for P2301 HSC-25 HANGAR COMPLEX: its NPDES ID, its permit type and status, its dates, its address in Andersen Air Force Base, Guam. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES 09R10I01A.

Identity

Facility as filed	P2301 HSC-25 HANGAR COMPLEX
Permittee as filed	Environmental Chemical Corporation
NPDES ID	09R10I01A
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	February 3, 2026
Expiration date	February 16, 2027
Issuing agency	U.S. EPA
Address	Andersen Air Force Base, GU 96929
Receiving water impaired	303(D) Listed
Subwatershed	Mataguac Spring-Frontal Pacific Ocean (HUC 220100000100)

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 09R10I01A.

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES 09R10I01A.

Inspections

EPA’s inspection file holds no inspection for NPDES 09R10I01A.

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 09R10I01A.

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Nearby on the register

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

The P2301 HSC-25 HANGAR COMPLEX is one of 2 storm water construction permits on EPA's NPDES register in Andersen Air Force Base, Guam. It also sits among 106 NPDES permits in the Mataguac Spring-Frontal Pacific Ocean subwatershed, and it has no pollutants under a numeric limit and no effluent exceedances recorded.