Clean Water Act discharge permit · NPDES IDR10C011

AZEK CO WESTING FACILITY RAIL SIDING ADDITION, Boise, ID: NPDES IDR10C011 discharge permit, effluent exceedances, inspections, penalties

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

AZEK CO WESTING FACILITY RAIL SIDING ADDITION, held by Knife River Corporation - Mountain West, holds NPDES permit IDR10C011, which discharges to Fivemile Creek. EPA’s file records it issued September 21, 2021 and expiring February 16, 2022.

AZEK CO WESTING FACILITY RAIL SIDING ADDITION, Boise, Idaho: Coverage under a general permit IDR10C011, held by Knife River Corporation - Mountain West; Construction stormwater; Administratively continued (past its expiration date and still in force until reissued); issued September 21, 2021, term to February 16, 2022; discharges to Fivemile Creek.

Idaho holds 3,630 Construction stormwater coverages of this permit type in EPA’s file; 401 were issued before IDR10C011. Knife River Corporation - Mountain West holds 56 permits in Idaho.

Other permits held by Knife River Corporation - Mountain West

CASCADE PIT, Cascade: IDR05J01R, issued June 22, 2021
US-30, E 4000 NORTH ROAD, Filer: IDR10016Q
SH-51, MOUNTAIN HOME SOUTH RESTORATION, Mountain Home: IDR10017K
GREENHURST RD. AND ELIJAH DRAIN CULVERT REPAIR, Nampa: IDR10017L
LANCASTER TERRACES/N. MOUNTAIN PIPING UPGRADES, Boise: IDR1001A0
BLACKS CREEK HILLSIDE DEVELOPMENT PROJECT, Boise: IDR1001B7
ENCORE SUBDIVISION, Boise: IDR1001D6
ADA COUNTY GLENWOOD EMS PARKING LOT RECONSTRUCTION AND DRAINAGE, Garden City: IDR1001E2
QUAIL HOLLOW GOLF COURSE PATH DEVELOPMENT, Boise: IDR1001F5
SEWER LINE REPLACEMENT AT GREGORY LIFT STATION, Meridian: IDR1001KK

Coverages issued nearest IDR10C011

September 10, 2021: WINCO FOODS DISTRIBUTION CENTER, Boise, IDR10C00S, held by Engineered Structures, Inc.
September 13, 2021: MICKELSEN CONSTRUCTION, INC., Blackfoot, IDR10L00P, held by Mickelsen Construction, Inc.
September 16, 2021: ELEVATE ACADEMY NAMPA, Nampa, IDR10C00X, held by Engineered Structures, Inc.
September 16, 2021: IDAHO OUTDOOR FIELD HOUSE, Boise, IDR10C00Y, held by Engineered Structures, Inc.
September 17, 2021: LEWISTON - NEZ PERCE COUNTY AIRPORT, Lewiston, IDR10C010, held by Knife River Corporation - Mountain West
September 21, 2021: LAKE VISTA ESTATES SUBDIVISION, Nampa, IDR10C012, held by Subdivision Maker LLC
September 22, 2021: INTERMOUNTAIN HOSPITAL ADA UPGRADES, Boise, IDR10L00Q, held by Erin Hoobing
September 23, 2021: MILE HIGH PINES, Meridian, IDR10C014, held by CBH Homes
September 24, 2021: CANYON ST. & SMITH AVE. WATER IMPROVEMENTS, Nampa, IDR10L00R, held by City of Nampa
September 27, 2021: COUGAR BAY NATURE PRESERVE, Couer D'Alene, IDR10C015, held by USDI - BLM

AZEK CO WESTING FACILITY RAIL SIDING ADDITION among its neighbors

EPA’s permit file holds 184 discharge permits in the Fivemile Creek subwatershed (HUC 170501140202), IDR10C011 among them.

Other permits in the Fivemile Creek subwatershed (HUC 170501140202)

2018 ROADWAY AND PEDESTRIAN IMPROVMENTS, Boise: IDR100146, not classed
2370 S MAPLE GROVE, Boise: IDR10C08U, minor permit, discharging to Fivemile Creek, permit term to February 9, 2027
2406 LIBERTY STREET, BOISE, IDAHO 83709, Boise: IDR1002DQ, not classed
9100 S. EISENMAN DEMOLITION, Boise: IDR1001WO, not classed
ABF FREIGHT SYSTEM, INC., Boise: IDNOEJ00U, minor permit, permit term to March 10, 2025
ACHD APPLE - MAINTENANCE AND OPERATIONS FACILITY, Boise: IDR10C1CR, minor permit, discharging to Fivemile, Eightmile & Ninemile Creeks, permit term to February 9, 2027
AIR PLANE HANGER, Boise: IDNOEJ01G, not classed
ALBERTSONS COMPANIES INC. (ACI) BOISE AIR TERMINAL, Boise: IDR05J01B, minor permit, discharging to Fivemile, Eightmile, and Ninemile Creeks, permit term to February 28, 2026
AMAZON.COM SERVICES LLC- BOI5, Boise: IDR05J101, minor permit, discharging to Fivemile Creek, permit term to February 28, 2026
B28, Boise: IDR10C1XL, minor permit, discharging to Fivemile Creek, permit term to February 9, 2027

What the register holds for AZEK CO WESTING FACILITY RAIL SIDING ADDITION: its NPDES ID, its permit type and status, its dates, its address in Boise, Idaho, its receiving water. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES IDR10C011.

Identity

Facility as filed	AZEK CO WESTING FACILITY RAIL SIDING ADDITION
Permittee as filed	Knife River Corporation - Mountain West
NPDES ID	IDR10C011
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	Construction stormwater
Issued	September 21, 2021
Expiration date	February 16, 2022
Address	Boise, ID 83709
Receiving water	Fivemile Creek
Subwatershed	Fivemile Creek (HUC 170501140202)

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 IDR10C011.

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES IDR10C011.

Inspections

EPA’s inspection file holds no inspection for NPDES IDR10C011.

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 IDR10C011.

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Nearby on the register

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

AZEK CO WESTING FACILITY RAIL SIDING ADDITION sits among 314 storm water construction permits on EPA's NPDES register in Boise, and 0.0% of them carry a violation on file. Of the 100 storm water construction permits in Boise, counting this record, 44.0% were issued before it. Within the Fivemile Creek subwatershed (HUC 170501140202), 184 NPDES permits are listed.