California / Reports /

Sanitary sewer overflow (SSO) reported — Lomita City, Oct 20, 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 908724, reported Oct 27, 2026, 12:00 AM 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: Lomita City (federal wastewater discharge permit, NPDES, 4SSO10404). Outlet: “1652 ([house number removed] Appian Way, Lomita, CA 90717)”. Location: 33.78700, -118.31300; location source: given in the source record, accurate to about 150 metres.

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

2. Waters named in the notice

The notice names: “Machado Lake”. Not linked to a mapped water.

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

Oct 20, 2026, 8:00 PM PDT

Ended

Oct 20, 2026, 10:00 PM PDT

Detail provided by the source

Times known to the minute

Reported to the source

Oct 27, 2026, 12:00 AM PDT

Published

not given

Source last updated

Nov 3, 2026, 12:00 AM PST

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

900 gallons (estimated)

Volume as reported

“900 gallons spilled (estimated total leaving the sewer system); 800 gallons reached surface water; 100 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

Source and versions

Source

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

Source record number

908724

Original notice

Read the original notice

Earlier version

None: this is the first record

Later versions

None

{
  "region": "4",
  "wdid": "4SSO10404",
  "enrollee_status": "Active",
  "system_name": "Lomita City CS",
  "agency_name": "Lomita City",
  "spill_event_id": "908724",
  "version": "1.3",
  "spill_status": "Certified",
  "draft_submitted_on": "27-OCT-26",
  "first_certified_on": "03-NOV-26",
  "final_certified_on": "03-NOV-26",
  "spill_type": "Category 1 Spill",
  "location_name": "1652 ([house number removed] Appian Way, Lomita, CA 90717)",
  "enrollee_notified_at": "10/20/2026 20:35",
  "crew_arrival_at": "10/20/2026 21:40",
  "start_at": "10/20/2026 20:00",
  "caloes_notified_at": null,
  "caloes_control_number": null,
  "technical_report_on": null,
  "lat": "33.78667",
  "lon": "-118.31301",
  "appearance_points": "Inside Building or Structure; Lateral Clean Out (Private)",
  "volume_total_gal": "900",
  "reached_drainage_system": "Y",
  "volume_recovered_from_drainage_gal": "0",
  "volume_left_in_drainage_gal": "800",
  "volume_to_surface_water_gal": "800",
  "volume_recovered_gal": "100",
  "destinations": "Building or Structure; Drainage Conveyance System that discharges to surface water; Street/Curb and Gutter (2 3)",
  "destination_points_given": "Y",
  "end_at": "10/20/2026 22:00",
  "causes": "Root Intrusion",
  "failure_location": "Gravity Mainline",
  "storm_event": "N",
  "response_completed_at": "10/20/2026 22:30",
  "receiving_water": "Machado Lake",
  "receiving_water_type": "Lake",
  "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": 33.786,
      "lon": -118.314
    },
    {
      "lat": 33.788,
      "lon": -118.311
    }
  ]
}