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Clean Water Act discharge permit · NPDES WAR313100

MERCER ISLAND MIXED USE, Mercer Island, WA: NPDES WAR313100 discharge permit, effluent exceedances, inspections, penalties

MERCER ISLAND MIXED USE, held by Xing Hua Group Ltd, holds NPDES permit WAR313100. EPA’s file records it issued November 18, 2020 and expiring December 31, 2025.

MERCER ISLAND MIXED USE, Mercer Island, Washington: Coverage under a general permit WAR313100, held by Xing Hua Group Ltd; Construction stormwater; Administratively continued (past its expiration date and still in force until reissued); issued November 18, 2020, term to December 31, 2025, by State.

  • Total Petroleum Hydrocarbons - Diesel: 1 limit, 2 violations of any kind, 2 effluent exceedances, latest February 28, 2025, largest 312% over the limit.
  • Turbidity: 1 limit, 1 violation of any kind, 1 effluent exceedance, latest August 31, 2024.
  • Transparency: 1 limit, 7 violations of any kind, 0 effluent exceedances.
  • pH: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • Tetrachloroethylene: 1 limit, 0 violations of any kind, 0 effluent exceedances.
  • cis-1,2-Dichloroethylene: 1 limit, 0 violations of any kind, 0 effluent exceedances.
  • Trichloroethene: 1 limit, 0 violations of any kind, 0 effluent exceedances.

Washington holds 4,744 Construction stormwater coverages of this permit type in EPA’s file; 1,658 were issued before WAR313100.

Coverages issued nearest WAR313100

  • November 18, 2020: CASCADE COURT, Silverdale, WAR313092, held by Red Rock Equities
  • November 18, 2020: MARINE LUMBER, Seattle, WAR313093, held by Mountain Construction
  • November 18, 2020: THE COVE, Redmond, WAR313097, held by Murray Franklyn
  • November 18, 2020: THE RESERVE AT PHANTOM LAKE STORMWATER VAULT, Bellevue, WAR313098, held by Murray Franklyn Homes, LLC
  • November 18, 2020: 5022 MLK JR WAY S APARTMENTS, Seattle, WAR313099, held by Habitat for Humanity Seattle-King County
  • November 18, 2020: UW HAGGETT HALL, Seattle, WAR313101, held by University of Washington
  • November 18, 2020: MATEO MEADOWS, Everson, WAR313103, held by Habitat for Humanity Whatcom County
  • November 18, 2020: COLUMBIA SHORES PASCO, Pasco, WAR313106, held by P & R Construction LLC
  • November 18, 2020: IVISTA ALDERWOOD, Lynnwood, WAR313107, held by Alderwood Investments LLC
  • November 18, 2020: GOAT HILL, Kirkland, WAR313114, held by OMA Construction, Inc.

MERCER ISLAND MIXED USE among its neighbors

EPA’s permit file holds 475 discharge permits in the Lake Washington-Sammamish River subwatershed (HUC 171100120400), WAR313100 among them. Its county holds 1,319, 8 of them major permits; WAR313100 is a minor permit.

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

Identity

Facility as filedMERCER ISLAND MIXED USE
Permittee as filedXing Hua Group Ltd
NPDES IDWAR313100
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
ProgramConstruction stormwater
IssuedNovember 18, 2020
Expiration dateDecember 31, 2025
Issuing agencyState
AddressMercer Island, WA 98040
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
Total Petroleum Hydrocarbons - Diesel122February 28, 2025312% over the limit
Turbidity111August 31, 2024
Transparency170
pH200
Tetrachloroethylene100
cis-1,2-Dichloroethylene100
Trichloroethene100

Inspections, violations and enforcement

EPA’s single-event violation file, as loaded, holds no violation for NPDES WAR313100.

Inspections

EPA’s inspection file holds no inspection for NPDES WAR313100.

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 WAR313100.

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Nearby on the register

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

What this page shows

The page is a public-records entry for NPDES permit WAR313100, held by Xing Hua Group Ltd for the MERCER ISLAND MIXED USE facility in Mercer Island, WA, and lists it as administratively continued under a construction stormwater program. The facts show 7 pollutants on file, 2 of which are under a numeric limit and 2 of which had an effluent exceedance, within the Lake Washington-Sammamish River subwatershed (HUC 171100120400).