Washington / Reports /

Sanitary sewer overflow (SSO) reported — Seattle CSO, Sep 26, 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 63dd7ad0-4d02-4b73-80f1-d7ee2e238e89, 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: “8700 Block of Sandpoint Way NE, 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: “Lake Washington”. DirtyWaterWatch links this report to Lake Washington, WA. Match basis: the water named in the report.

3. Estimated downstream stretch

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

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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

Sep 26, 2026, 7:31 PM EDT

Ended

Sep 27, 2026, 2:22 AM 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

18,100 gallons (not stated whether estimated or measured)

Volume as reported

“18,100 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

Status history from this report

• Discharge or advisory reported Lake Washington: Discharge reported ongoing, Sep 26, 2026, 7:31 PM EDT to Sep 27, 2026, 2:22 AM EDT
• Caution Lake Washington: Within the caution period after the reported end, Sep 27, 2026, 2:22 AM EDT to Oct 1, 2026, 2:22 AM EDT

Source: DirtyWaterWatch calculations using this report and the published status rules. Updated 2026-11-06 06:13 UTC.

Source and versions

Source

Washington Ecology Sewage Spills list (RCW 90.48.636 public website)

Source record number

63dd7ad0-4d02-4b73-80f1-d7ee2e238e89

Original notice

Read the original notice

Earlier version

None: this is the first record

Later versions

None

{
  "row": {
    "objectid": 81,
    "globalid": "{63DD7AD0-4D02-4B73-80F1-D7EE2E238E89}",
    "ecology_region": "Northwest",
    "start_date_and_time": 1790465460000,
    "permitee": "Seattle CSO",
    "location": "8700 Block of Sandpoint Way NE, Seattle",
    "county": "King",
    "initial_estimated_amount": "50 Gallons per Minute",
    "level_of_treatment": "None (Raw Sewage)",
    "potentially_impacted_area": "Lake Washington",
    "end_event_timedate": 1790490120000,
    "final_event_duration_hours": "6.85 Hours",
    "final_total_event_volume": "18,100 Gallons",
    "link_to_5_day_report": "https://apps.ecology.wa.gov/paris/DownloadDocument.aspx?id=649876",
    "event_type": "Sanitary Sewer Overflow_",
    "event_type_other": null,
    "erts_number": "750415",
    "was_the_spill_continuous": "Continuous"
  },
  "potentially_impacted_area": "Lake Washington",
  "reached_water": true,
  "report_url": "https://apps.ecology.wa.gov/paris/DownloadDocument.aspx?id=649876",
  "erts_number": "750415",
  "county": "King",
  "duration_text": "6.85 Hours",
  "continuous": "Continuous"
}