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Sanitary sewer overflow (SSO) reported — Los Angeles Cnty Sanitation Districts, Aug 29, 2026

Ended (as reported) · California State Water Resources Control Board (CIWQS Sanitary Sewer System Database)

Source: California State Water Resources Control Board (CIWQS Sanitary Sewer System Database) via State Water Board CIWQS Sanitary Sewer System spill data: Cat1-2-3-Spills.txt (nightly flat file), record 907966, reported Aug 29, 2026, 3:02 PM PDT, retrieved 2026-11-05 15:08 UTC · Read the original notice

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1. Reported wastewater outlet

Operator named in the record: Los Angeles Cnty Sanitation Districts (federal wastewater discharge permit, NPDES, 4SSO11388). Outlet: “Wilder Avenue Pumping Plant Force Main”. Location: 33.84575, -118.05978; location source: given in the source record.

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

2. Waters named in the notice

The notice names: “Coyote Creek, San Gabriel River, Pacific Ocean”. DirtyWaterWatch links this report to Coyote Creek, CA, Pacific Ocean, CA, San Gabriel River, CA. Match basis: the water named in the report.

3. Estimated downstream stretch

No downstream estimate is available for this report.

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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

Aug 29, 2026, 11:23 AM PDT

Ended

Aug 29, 2026, 1:04 PM PDT

Detail provided by the source

Times known to the minute

Reported to the source

Aug 29, 2026, 3:02 PM PDT

Published

not given

Source last updated

Sep 11, 2026, 12:00 AM PDT

Last retrieved by DirtyWaterWatch

2026-11-05 15:08 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

“untreated sewage”

Volume

505 gallons (estimated)

Volume as reported

“505 gallons spilled (estimated total leaving the sewer system); 101 gallons reached surface water; 404 gallons recovered”

Advice from California State Water Resources Control Board (CIWQS Sanitary Sewer System Database)

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 Coyote Creek: Discharge reported ongoing, Aug 29, 2026, 11:23 AM PDT to Aug 29, 2026, 1:04 PM PDT
• Caution Coyote Creek: Within the caution period after the reported end, Aug 29, 2026, 1:04 PM PDT to Sep 1, 2026, 1:04 PM PDT
• Discharge or advisory reported Pacific Ocean: Discharge reported ongoing, Aug 29, 2026, 11:23 AM PDT to Aug 29, 2026, 1:04 PM PDT
• Caution Pacific Ocean: Within the caution period after the reported end, Aug 29, 2026, 1:04 PM PDT to Sep 1, 2026, 1:04 PM PDT
• Discharge or advisory reported San Gabriel River: Discharge reported ongoing, Aug 29, 2026, 11:23 AM PDT to Aug 29, 2026, 1:04 PM PDT
• Caution San Gabriel River: Within the caution period after the reported end, Aug 29, 2026, 1:04 PM PDT to Sep 1, 2026, 1:04 PM PDT

Source: DirtyWaterWatch calculations using this report and the published status rules. Updated 2026-11-06 09:03 UTC.

Source and versions

Source

State Water Board CIWQS Sanitary Sewer System spill data: Cat1-2-3-Spills.txt (nightly flat file)

Source record number

907966

Original notice

Read the original notice

Earlier version

None: this is the first record

Later versions

None

{
  "region": "4",
  "wdid": "4SSO11388",
  "enrollee_status": "Active",
  "system_name": "County Sanitation District Joint Outfall CS",
  "agency_name": "Los Angeles Cnty Sanitation Districts",
  "spill_event_id": "907966",
  "version": "1.2",
  "spill_status": "Certified",
  "draft_submitted_on": "02-SEP-26",
  "first_certified_on": "11-SEP-26",
  "final_certified_on": "11-SEP-26",
  "spill_type": "Category 1 Spill",
  "location_name": "Wilder Avenue Pumping Plant Force Main",
  "enrollee_notified_at": "08/29/2026 11:23",
  "crew_arrival_at": "08/29/2026 12:52",
  "start_at": "08/29/2026 11:23",
  "caloes_notified_at": "08/29/2026 15:02",
  "caloes_control_number": "26-4429",
  "technical_report_on": null,
  "lat": "33.845748",
  "lon": "-118.059777",
  "appearance_points": "Force Main; Other (specify below)",
  "volume_total_gal": "505",
  "reached_drainage_system": "Y",
  "volume_recovered_from_drainage_gal": "105",
  "volume_left_in_drainage_gal": "0",
  "volume_to_surface_water_gal": "101",
  "volume_recovered_gal": "404",
  "destinations": "Drainage Conveyance System that discharges to surface water; Paved Surface; Street/Curb and Gutter (2 3); Surface Water",
  "destination_points_given": "Y",
  "end_at": "08/29/2026 13:04",
  "causes": "Other (specify below)",
  "failure_location": "Force Main",
  "storm_event": "N",
  "response_completed_at": "08/29/2026 18:55",
  "receiving_water": "Coyote Creek, San Gabriel River, Pacific Ocean",
  "receiving_water_type": "Ocean; Other (specify below); River",
  "public_access_impact": "Other (specify below)",
  "closing_entity": "N/A",
  "days_closed_or_restricted": "0",
  "within_1000_ft_of_intake": "N",
  "samples_collected": "Y",
  "spill_category": "1",
  "reached_water": true,
  "destination_points": [
    {
      "lat": 33.846,
      "lon": -118.06
    },
    {
      "lat": 33.846,
      "lon": -118.06
    },
    {
      "lat": 33.844,
      "lon": -118.06
    }
  ]
}