Clean Water Act discharge permit · NPDES IDR10C1C6

450 WOOD RIVER, Ketchum, ID: NPDES IDR10C1C6 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

450 WOOD RIVER, held by Conrad Brothers Construction, holds NPDES permit IDR10C1C6, which discharges to Big Wood River. EPA’s file records it issued January 10, 2022 and expiring February 9, 2027.

450 WOOD RIVER, Ketchum, Idaho: Coverage under a general permit IDR10C1C6, held by Conrad Brothers Construction; Construction stormwater; Effective; issued January 10, 2022, term to February 9, 2027; discharges to Big Wood River; New Single-Family Housing Construction [except For-Sale Builders].

Idaho holds 3,630 Construction stormwater coverages of this permit type in EPA’s file; 576 were issued before IDR10C1C6. Conrad Brothers Construction holds 3 permits in Idaho.

Other permits held by Conrad Brothers Construction

DURANT RESIDENCE, Ketchum: IDR10C0D8, issued May 18, 2022
BADGER RESIDENCE, Ketchum: IDR10C1QX, issued January 10, 2022

Coverages issued nearest IDR10C1C6

January 10, 2022: DRY CREEK VILLAGE - PHASE 4, Boise, IDR10C1BZ, held by Brookside Developers, Inc.
January 10, 2022: WILLOW BRUSH SUBDIVISION (2), Eagle, IDR10C1C0, held by Matthew Swenson
January 10, 2022: KWS SEEDS FACILITY, Kimberly, IDR10C1C2, held by KWS Seeds - Breanne Stowell
January 10, 2022: I-15 NORTHGATE TO FORT HALL - SOUTH, Chubbuck, IDR10C1C3, held by Idaho Transportation Department
January 10, 2022: MIDDLEBURY NORTH SUBDIVISION NO. 2, Nampa, IDR10C1C5, held by Trilogy Development, Inc.
January 10, 2022: JACK'S PLACE SUBDIVISION NO. 2, Nampa, IDR10C1C7, held by Trilogy Development, Inc.
January 10, 2022: WESTFIELD ESTATES DIV. 5, Pocatello, IDR10C1CA, held by Ryan Holm Construction LLC
January 10, 2022: MOUNTAINSIDE VILLAGE, Victor, IDR10C1CB, held by Powers Excavating
January 10, 2022: FRANKLIN VILLAGE NORTH NO 3, Nampa, IDR10C1CC, held by Hubble Homes, LLC
January 10, 2022: O'BRADY SUBDIVISION, Boise, IDR10C1CD, held by O'Brady Development, LLC

450 WOOD RIVER among its neighbors

EPA’s permit file holds 15 discharge permits in the Elkhorn Gulch-Big Wood River subwatershed (HUC 170402190305), IDR10C1C6 among them.

Other permits in the Elkhorn Gulch-Big Wood River subwatershed (HUC 170402190305)

1ST AVE. REHABILITATION, 5TH STREET TO SUN VALLEY ROAD, Ketchum: IDR10L0LV, not classed
BADGER RESIDENCE, Ketchum: IDR10C1QX, minor permit, discharging to Wetlands Adjoining Big Wood River, permit term to February 9, 2027
CASE RESIDENCE, Hailey: IDR10C1PE, minor permit, discharging to Big Wood River, permit term to February 9, 2027
CHRISTMAS CHAIR LIFT, Ketchum: IDR10C227, minor permit, discharging to Big Wood River, permit term to February 9, 2027
DURANT RESIDENCE, Ketchum: IDR10C0D8, minor permit, discharging to big wood river, permit term to February 9, 2027
KETCHUM SUN VALLEY WWTP, Ketchum: IDR10L0CL, not classed
KETCHUM, CITY OF - KETCHUM/SUN VALLEY WWTP, Ketchum: ID0020281, major permit, discharging to BIG WOOD RIVER, permit term to June 12, 2006
LOOKOUT EXPRESS CHAIR LIFT, Ketchum: IDR10C228, minor permit, discharging to Big Wood River, permit term to February 9, 2027
NEW SINGLE FAMILY RESIDENCE FOR BRUCE THOMPSON, Sun Valley: IDR10C1GL, minor permit, discharging to Elkhorn Gulch, permit term to February 9, 2027
RIVER BEND APARTMENTS, Ketchum: IDR10C27P, minor permit, discharging to Big Wood River, permit term to February 9, 2027

What the register holds for 450 WOOD RIVER: its NPDES ID, its permit type and status, its dates, its address in Ketchum, Idaho, its receiving water. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES IDR10C1C6.

Identity

Facility as filed	450 WOOD RIVER
Permittee as filed	Conrad Brothers Construction
NPDES ID	IDR10C1C6
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	January 10, 2022
Expiration date	February 9, 2027
Address	Ketchum, ID 83340
Receiving water	Big Wood River
Subwatershed	Elkhorn Gulch-Big Wood River (HUC 170402190305)
NAICS	236115 – New Single-Family Housing Construction [except For-Sale Builders]
SIC	1521 – Single-Family Housing Construction

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 IDR10C1C6.

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES IDR10C1C6.

Inspections

EPA’s inspection file holds no inspection for NPDES IDR10C1C6.

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 IDR10C1C6.

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, IDR10C1C6.

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Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

Of the 11 storm water construction permits in Ketchum, 0.0% carry a violation on file, and 450 WOOD RIVER is among them. The Elkhorn Gulch-Big Wood River subwatershed holds 15 NPDES permits, including this filing from Conrad Brothers Construction. Of the 8 storm water construction permits in Ketchum, 0.0% were issued before this filing.