Sanitary sewer overflow (SSO) reported — ALEXIS STP SSCS, Aug 16, 2026

Ended (as reported) · EPA ECHO Sewer Overflow and Bypass Event report (reported to regulators)

Source: EPA ECHO Sewer Overflow and Bypass Event report (reported to regulators), record IL0021211:1:1, reported Aug 31, 2026, 12:00 AM CDT, retrieved 2026-11-06 08:38 UTC · Read the original notice

Current status from this report

This report does not set a map status as of Nov 6, 2026, 3:03 AM CST. Check its dates and the status rules.

A report is not a test of the water. See how we assign statuses.

Read the original notice · Report an error

1. Reported wastewater outlet

Operator named in the record: ALEXIS STP SSCS (federal wastewater discharge permit, NPDES, IL0021211). Outlet: not stated. Location: 41.05790, -90.56549; 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: “middle henderson creek”. DirtyWaterWatch links this report to Middle Henderson Creek, IL. Match basis: the water named in the report.

3. Estimated downstream stretch

No downstream estimate is available for this report.

Map sources: water outlines and launches from OpenBoatLaunch and OpenStreetMap contributors (Open Database License); wastewater outlets from EPA and state records; downstream estimates by DirtyWaterWatch using U.S. Geological Survey maps and flow data. Base map: OpenFreeMap and OpenMapTiles.

Open on the main map

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 16, 2026, 6:00 PM CDT
Ended: Aug 17, 2026, 6:00 PM CDT
Detail provided by the source: Times known to the minute
Reported to the source: Aug 31, 2026, 12:00 AM CDT
Published: Nov 4, 2026, 12:00 AM CST
Source last updated: Nov 4, 2026, 6:21 AM CST
Last retrieved by DirtyWaterWatch: 2026-11-06 08:38 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: 10,000 gallons (not stated whether estimated or measured)
Volume as reported: “10,000 gallons (Other)”

Advice from EPA ECHO Sewer Overflow and Bypass Event report (reported to regulators)

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 Middle Henderson Creek: Discharge reported ongoing, Aug 16, 2026, 6:00 PM CDT to Aug 17, 2026, 6:00 PM CDT
Caution Middle Henderson Creek: Within the caution period after the reported end, Aug 17, 2026, 6:00 PM CDT to Aug 20, 2026, 6:00 PM CDT

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

Source and versions

Source: Public source
Source record number: IL0021211:1:1
Original notice: Read the original notice
Earlier version: None: this is the first record
Later versions: None

Record details

Record details
Record identifier	echo-sewer-overflow:IL0021211:1:1
Source identifier	echo-sewer-overflow
Source record number	IL0021211:1:1
Earlier version	Not provided
Type	Sanitary sewer overflow (SSO)
Status in the report	Ended (as reported)
Sewer operator identifier	Not provided
Sewer operator	ALEXIS STP SSCS
Federal wastewater discharge permit (NPDES)	IL0021211
Outlet number	Not provided
Outlet name	Not provided
Water named in the report	middle henderson creek
Linked waters	middle-henderson-creek-il
How this report was linked to the water	the water named in the report
Latitude	41.058
Longitude	-90.565
Location source	given in the source record
Location accuracy, in metres	Not provided
Started	Aug 16, 2026, 6:00 PM CDT (2026-08-16T18:00:00-05:00)
Ended	Aug 17, 2026, 6:00 PM CDT (2026-08-17T18:00:00-05:00)
Detail provided by the source	to the minute
Reported to the source	Aug 31, 2026, 12:00 AM CDT (2026-08-31)
Published	Nov 4, 2026, 12:00 AM CST (2026-11-04)
Source last updated	Nov 4, 2026, 6:21 AM CST (2026-11-04T12:21:15Z)
Last retrieved by DirtyWaterWatch	Nov 6, 2026, 2:38 AM CST (2026-11-06T08:38:59Z)
Material	untreated sewage
Volume, in gallons	10,000
Volume as reported	10,000 gallons (Other)
How volume was determined	not stated whether estimated or measured
Authority	EPA ECHO Sewer Overflow and Bypass Event report (reported to regulators)
Advice	Not provided
Advice period, in hours	Not provided
Basis of the advice period	Not provided
Original notice	https://echo.epa.gov/detailed-facility-report?fid=IL0021211&sys=ICP

Original source data

{
  "permit_identifier": "IL0021211",
  "program_report_form_set_id": "1",
  "program_report_form_id": "1",
  "sewer_overflow_bypass_event_key": "27265",
  "sewer_overflow_bypass_event_id_ext": "1",
  "sewer_overflow_bypass_description_text": "manhole at the plant",
  "sewer_overflow_bypass_reporting_requirement_code": "1",
  "sewer_overflow_reporting_requirement_desc": "5-day reporting for noncompliance that may endanger health or the environment",
  "wet_weather_occurance_indicator": "Y",
  "sewer_overflow_structure_type_code": "MAN",
  "sewer_overflow_structure_type_desc": "Manhole",
  "collection_system_identifier": "001",
  "latitude_measure": "41.057901",
  "longitude_measure": "-90.565487",
  "sewer_overflow_bypass_duration_hours": "24.00",
  "sewer_overflow_bypass_start_datetime": "2026-08-16 18:00:00",
  "sewer_overflow_bypass_end_datetime": "2026-08-17 18:00:00",
  "discharge_quantification_method_code": "OTH",
  "discharge_quantification_method_desc": "Other",
  "sewer_overflow_bypass_discharge_volume_gallons": "10000.00",
  "payload_id": "317956735",
  "event_transaction_type": "N",
  "program_report_received_date": "2026-08-31",
  "program_report_start_date": "2026-08-16",
  "program_report_end_date": "2026-08-17",
  "electronic_submission_type_code": "ES1",
  "electr_submission_type_desc": "EPA electronic reporting system",
  "program_report_npdes_data_group_number_code": "G9A",
  "transaction_type": "N",
  "collection_system_owner_type_code": "CTG",
  "collection_system_owner_type_desc": "Municipality",
  "collection_system_population": "793",
  "types": [
    "Sanitary Sewer Overflow Event"
  ],
  "receiving_waters": [
    " middle henderson creek"
  ],
  "impacts": [
    {
      "code": "NOI",
      "desc": "No observable impacts",
      "other": null
    }
  ],
  "causes": [
    {
      "code": "HLI",
      "desc": "High Levels of Inflow and/or Infiltration",
      "other": null
    }
  ],
  "corrective_actions": [
    {
      "code": "NOA",
      "desc": "None Available",
      "other": null
    }
  ],
  "treatment": [],
  "collection_system_name": "ALEXIS STP SSCS",
  "percent_collection_system_css": "0",
  "reached_water_rule": "receiving water named",
  "timezone_note": "ECHO gives event times without a timezone; read as America/Chicago, the permit's state's zone (a fall-back hour that happens twice is read as the first)",
  "report_version": "1"
}

Staff names, email addresses and phone numbers are removed from source data before it is stored.