Washington / Reports /

Sanitary sewer overflow (SSO) reported — Seattle CSO, Aug 20, 2026

Ended (as reported) · Washington State Department of Ecology (sewage spill list, RCW 90.48.636)

Source: Washington State Department of Ecology (sewage spill list, RCW 90.48.636) via Washington Ecology Sewage Spills list (RCW 90.48.636 public website), record 37883e01-1b1b-4d7e-822c-82fb0634948f, the source gives no report time, retrieved 2026-11-06 06:01 UTC · Read the original notice

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1. Reported wastewater outlet

Operator named in the record: Seattle CSO (federal wastewater discharge permit, NPDES, WA0031682). Outlet: “800 Block of 5th Avenue, Seattle”. Location: not given in the report or in the outlet records.

Outfall: a pipe or outlet where wastewater enters a water body.

2. Waters named in the notice

The notice names no water. No receiving water: the report names no water, only 'Street and Private Utility Vaults'. The report is kept here but is not placed on a water and colours none on the map.

3. Estimated downstream stretch

We estimate routes only on rivers before they become tidal. We do not estimate routes through tidal water or lakes.

When it happened and when it was reported

Event and notice times use Eastern Time (EST or EDT). Retrieval times use Coordinated Universal Time (UTC).

Started

Aug 20, 2026, 7:33 PM EDT

Ended

Aug 20, 2026, 11:20 PM EDT

Detail provided by the source

Times known to the minute

Reported to the source

not given

Published

not given

Source last updated

not given

Last retrieved by DirtyWaterWatch

2026-11-06 06:01 UTC

What and how much

Type

Sanitary sewer overflow (SSO): sewage spills from a sewer meant to carry sewage separately from rainwater.

Status in the record

Ended (as reported)

Material

“None (Raw Sewage)”

Volume

650 gallons (not stated whether estimated or measured)

Volume as reported

“650 Gallons”

Advice from Washington State Department of Ecology (sewage spill list, RCW 90.48.636)

This report includes no advice. Check current local health notices.

Advice period

This report does not state a period. See the rule DirtyWaterWatch applies and its source.

Basis

not stated

Source and versions

Source

Washington Ecology Sewage Spills list (RCW 90.48.636 public website)

Source record number

37883e01-1b1b-4d7e-822c-82fb0634948f

Original notice

Read the original notice

Earlier version

None: this is the first record

Later versions

None

{
  "row": {
    "objectid": 56,
    "globalid": "{37883E01-1B1B-4D7E-822C-82FB0634948F}",
    "ecology_region": "Northwest",
    "start_date_and_time": 1787268780000,
    "permitee": "Seattle CSO",
    "location": "800 Block of 5th Avenue, Seattle",
    "county": "King",
    "initial_estimated_amount": "650",
    "level_of_treatment": "None (Raw Sewage)",
    "potentially_impacted_area": "Street and Private Utility Vaults",
    "end_event_timedate": 1787282400000,
    "final_event_duration_hours": "3.78 hours",
    "final_total_event_volume": "650 Gallons",
    "link_to_5_day_report": "https://apps.ecology.wa.gov/paris/DownloadDocument.aspx?id=646157",
    "event_type": "Sanitary Sewer Overflow_",
    "event_type_other": null,
    "erts_number": "749316",
    "was_the_spill_continuous": "Continuous"
  },
  "potentially_impacted_area": "Street and Private Utility Vaults",
  "reached_water": false,
  "report_url": "https://apps.ecology.wa.gov/paris/DownloadDocument.aspx?id=646157",
  "erts_number": "749316",
  "county": "King",
  "duration_text": "3.78 hours",
  "continuous": "Continuous"
}