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Sanitary sewer overflow (SSO) reported — Irwindale City, Aug 27, 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 907943, reported Aug 27, 2026, 5:39 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: Irwindale City (federal wastewater discharge permit, NPDES, 4SSO10396). Outlet: “2168-0314 ([house number removed] Rivergrade Road, Irwindale, CA 91706)”. Location: 34.10162, -117.97799; 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: “San Gabriel River”. DirtyWaterWatch links this report to 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 27, 2026, 3:52 PM PDT

Ended

Aug 27, 2026, 4:36 PM PDT

Detail provided by the source

Times known to the minute

Reported to the source

Aug 27, 2026, 5:39 PM PDT

Published

not given

Source last updated

Sep 10, 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

500 gallons (estimated)

Volume as reported

“500 gallons spilled (estimated total leaving the sewer system); 500 gallons reached surface water; 0 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 San Gabriel River: Discharge reported ongoing, Aug 27, 2026, 3:52 PM PDT to Aug 27, 2026, 4:36 PM PDT
• Caution San Gabriel River: Within the caution period after the reported end, Aug 27, 2026, 4:36 PM PDT to Aug 30, 2026, 4:36 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

907943

Original notice

Read the original notice

Earlier version

None: this is the first record

Later versions

None

{
  "region": "4",
  "wdid": "4SSO10396",
  "enrollee_status": "Active",
  "system_name": "Irwindale City CS",
  "agency_name": "Irwindale City",
  "spill_event_id": "907943",
  "version": "1.3",
  "spill_status": "Certified",
  "draft_submitted_on": "01-SEP-26",
  "first_certified_on": "10-SEP-26",
  "final_certified_on": "10-SEP-26",
  "spill_type": "Category 1 Spill",
  "location_name": "2168-0314 ([house number removed] Rivergrade Road, Irwindale, CA 91706)",
  "enrollee_notified_at": "08/27/2026 15:58",
  "crew_arrival_at": "08/27/2026 16:15",
  "start_at": "08/27/2026 15:52",
  "caloes_notified_at": "08/27/2026 17:39",
  "caloes_control_number": "26-4396",
  "technical_report_on": null,
  "lat": "34.10162",
  "lon": "-117.97799",
  "appearance_points": "Manhole",
  "volume_total_gal": "500",
  "reached_drainage_system": "Y",
  "volume_recovered_from_drainage_gal": "0",
  "volume_left_in_drainage_gal": "500",
  "volume_to_surface_water_gal": "500",
  "volume_recovered_gal": "0",
  "destinations": "Drainage Conveyance System that discharges to surface water; Street/Curb and Gutter (2 3)",
  "destination_points_given": "Y",
  "end_at": "08/27/2026 16:36",
  "causes": "Root Intrusion",
  "failure_location": "Gravity Mainline",
  "storm_event": "N",
  "response_completed_at": "08/27/2026 17:20",
  "receiving_water": "San Gabriel River",
  "receiving_water_type": "River",
  "public_access_impact": "Other (specify below)",
  "closing_entity": "N/A",
  "days_closed_or_restricted": "0",
  "within_1000_ft_of_intake": "N",
  "samples_collected": "N",
  "spill_category": "1",
  "reached_water": true,
  "destination_points": [
    {
      "lat": 34.1,
      "lon": -117.983
    }
  ]
}