California / Reports /

Sanitary sewer overflow (SSO) reported — Town Of Hillsborough, Oct 26, 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 908786, the source gives no report time, retrieved 2026-11-05 15:08 UTC · Read the original notice

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1. Reported wastewater outlet

Operator named in the record: Town Of Hillsborough (federal wastewater discharge permit, NPDES, 2SSO10142). Outlet: “[house number removed] Severn Ln”. Location: 37.56640, -122.33697; 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 no water. No receiving water: the report says the discharge did not reach a water. 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.

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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 26, 2026, 10:10 AM PDT

Ended

Oct 26, 2026, 11:03 AM PDT

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

2026-11-05 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

165 gallons (estimated)

Volume as reported

“165 gallons spilled (estimated total leaving the sewer system); 165 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

908786

Original notice

Read the original notice

Earlier version

None: this is the first record

Later versions

None

{
  "region": "2",
  "wdid": "2SSO10142",
  "enrollee_status": "Active",
  "system_name": "Town Of Hillsborough CS",
  "agency_name": "Town Of Hillsborough",
  "spill_event_id": "908786",
  "version": "1.1",
  "spill_status": "Ready to Certify",
  "draft_submitted_on": null,
  "first_certified_on": null,
  "final_certified_on": null,
  "spill_type": "Monthly Category 3 Spill",
  "location_name": "[house number removed] Severn Ln",
  "enrollee_notified_at": "10/26/2026 10:25",
  "crew_arrival_at": "10/26/2026 10:45",
  "start_at": "10/26/2026 10:10",
  "caloes_notified_at": null,
  "caloes_control_number": null,
  "technical_report_on": null,
  "lat": "37.5664",
  "lon": "-122.33697",
  "appearance_points": "Manhole",
  "volume_total_gal": "165",
  "reached_drainage_system": "Y",
  "volume_recovered_from_drainage_gal": "165",
  "volume_left_in_drainage_gal": null,
  "volume_to_surface_water_gal": null,
  "volume_recovered_gal": "165",
  "destinations": "Drainage Conveyance System; Unpaved Surface",
  "destination_points_given": "Y",
  "end_at": "10/26/2026 11:03",
  "causes": "Debris-Rags; Root Intrusion",
  "failure_location": "Gravity Mainline",
  "storm_event": "N",
  "response_completed_at": "10/26/2026 12:30",
  "receiving_water": null,
  "receiving_water_type": null,
  "public_access_impact": null,
  "closing_entity": null,
  "days_closed_or_restricted": null,
  "within_1000_ft_of_intake": null,
  "samples_collected": null,
  "spill_category": "3",
  "reached_water": false,
  "destination_points": [
    {
      "lat": 37.566,
      "lon": -122.337
    }
  ]
}