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Clean Water Act discharge permit · NPDES WAR314017

TROWBRIDGE LLC, Seattle, WA: NPDES WAR314017 discharge permit, effluent exceedances, inspections, penalties

TROWBRIDGE LLC, held by Ecco Design Inc., holds NPDES permit WAR314017. EPA’s file records it issued November 20, 2019 and expiring December 31, 2024.

TROWBRIDGE LLC, Seattle, Washington: Coverage under a general permit WAR314017, held by Ecco Design Inc.; Administratively continued (past its expiration date and still in force until reissued); issued November 20, 2019, term to December 31, 2024, by State.

  • pH: 0 limits, 2 violations of any kind, 0 effluent exceedances.
  • Turbidity: 0 limits, 1 violation of any kind, 0 effluent exceedances.
  • Copper, total [as Cu]: 0 limits, 1 violation of any kind, 0 effluent exceedances.
  • Zinc, total [as Zn]: 0 limits, 1 violation of any kind, 0 effluent exceedances.
  • E. coli: 0 limits, 1 violation of any kind, 0 effluent exceedances.
  • Oil and grease visual: 0 limits, 1 violation of any kind, 0 effluent exceedances.

TROWBRIDGE LLC among its neighbors

EPA’s permit file holds 475 discharge permits in the Lake Washington-Sammamish River subwatershed (HUC 171100120400), WAR314017 among them. Its county holds 1,319, 8 of them major permits; WAR314017 is a minor permit.

Other permits in the Lake Washington-Sammamish River subwatershed (HUC 171100120400)

Identity

Facility as filedTROWBRIDGE LLC
Permittee as filedEcco Design Inc.
NPDES IDWAR314017
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeCoverage under a general permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
IssuedNovember 20, 2019
Expiration dateDecember 31, 2024
Issuing agencyState
AddressSeattle, WA 98107
Receiving water impaired303(D) Listed
SubwatershedLake Washington-Sammamish River (HUC 171100120400)

Effluent limits and exceedances

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 measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
pH020
Turbidity010
Copper, total [as Cu]010
Zinc, total [as Zn]010
E. coli010
Oil and grease visual010

EPA’s effluent violation file records no exceedance of a numeric limit for NPDES WAR314017.

Inspections, violations and enforcement

EPA’s single-event violation file, as loaded, holds no violation for NPDES WAR314017.

Inspections

EPA’s inspection file holds no inspection for NPDES WAR314017.

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 WAR314017.

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Nearby on the register

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

What this page shows

TROWBRIDGE LLC, a general permit coverage in Seattle, King County, Washington, is one of 470 such coverages on EPA's NPDES register for King County and one of 472 NPDES permits in the Lake Washington-Sammamish River subwatershed. Among the 470 King County general permit coverages, 17.4% carry an earlier issue date than this one, and the permit records no pollutants under a numeric limit or with an effluent exceedance (both 0).