Combined sewer overflow (CSO) reported — PEKIN STP #1, Aug 15, 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 IL0034495:32:1, reported Aug 17, 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: PEKIN STP #1 (federal wastewater discharge permit, NPDES, IL0034495). Outlet: 003. Location: 40.57528, -89.65028; location source: given in the source record.

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

Source: EPA ECHO wastewater outlet records, permit IL0034495, outlet 003. Location linked by DirtyWaterWatch.

2. Waters named in the notice

The notice names: “Illinois River”. DirtyWaterWatch links this report to Illinois River, IL. Match basis: the outlet's permit and number in EPA and state records.

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.

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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 15, 2026, 6:00 AM CDT
Ended: Aug 15, 2026, 11:00 AM CDT
Detail provided by the source: Times known to the minute
Reported to the source: Aug 17, 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: Combined sewer overflow (CSO): sewage mixed with rainwater spills from a shared sewer system.
Status in the record: Ended (as reported)
Material: “combined sewage and stormwater”
Volume: 4 million gallons (estimated)
Volume as reported: “4,000,000 gallons (Best Professional Judgement)”

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 Illinois River: Discharge reported ongoing, Aug 15, 2026, 6:00 AM CDT to Aug 15, 2026, 11:00 AM CDT
Caution Illinois River: Within the caution period after the reported end, Aug 15, 2026, 11:00 AM CDT to Aug 18, 2026, 11:00 AM 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: IL0034495:32:1
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:IL0034495:32:1
Source identifier	echo-sewer-overflow
Source record number	IL0034495:32:1
Earlier version	Not provided
Type	Combined sewer overflow (CSO)
Status in the report	Ended (as reported)
Sewer operator identifier	il-pekin-stp-1
Sewer operator	PEKIN STP #1
Federal wastewater discharge permit (NPDES)	IL0034495
Outlet number	003
Outlet name	Not provided
Water named in the report	Illinois River
Linked waters	illinois-river-il
How this report was linked to the water	the outlet's permit and number in EPA and state records
Latitude	40.575
Longitude	-89.65
Location source	given in the source record
Location accuracy, in metres	Not provided
Started	Aug 15, 2026, 6:00 AM CDT (2026-08-15T06:00:00-05:00)
Ended	Aug 15, 2026, 11:00 AM CDT (2026-08-15T11:00:00-05:00)
Detail provided by the source	to the minute
Reported to the source	Aug 17, 2026, 12:00 AM CDT (2026-08-17)
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	combined sewage and stormwater
Volume, in gallons	4,000,000
Volume as reported	4,000,000 gallons (Best Professional Judgement)
How volume was determined	estimated
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=IL0034495&sys=ICP

Original source data

{
  "permit_identifier": "IL0034495",
  "program_report_form_set_id": "32",
  "program_report_form_id": "1",
  "sewer_overflow_bypass_event_key": "27107",
  "sewer_overflow_bypass_event_id_ext": "1",
  "sewer_overflow_bypass_reporting_requirement_code": "3",
  "sewer_overflow_reporting_requirement_desc": "Wet-weather CSO reporting requirement not related to noncompliance reporting",
  "wet_weather_occurance_indicator": "Y",
  "sewer_overflow_structure_type_code": "CSO",
  "sewer_overflow_structure_type_desc": "CSO Outfall",
  "collection_system_identifier": "001",
  "permitted_feature_identifier": "003",
  "latitude_measure": "40.575278",
  "longitude_measure": "-89.650278",
  "sewer_overflow_bypass_duration_hours": "5.00",
  "sewer_overflow_bypass_start_datetime": "2026-08-15 06:00:00",
  "sewer_overflow_bypass_end_datetime": "2026-08-15 11:00:00",
  "discharge_quantification_method_code": "BPJ",
  "discharge_quantification_method_desc": "Best Professional Judgement",
  "sewer_overflow_bypass_discharge_volume_gallons": "4000000.00",
  "payload_id": "316740458",
  "event_transaction_type": "N",
  "program_report_received_date": "2026-08-17",
  "program_report_start_date": "2026-08-15",
  "program_report_end_date": "2026-08-15",
  "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": "31731",
  "types": [
    "Combined Sewer Overflow Event"
  ],
  "receiving_waters": [
    "Illinois River"
  ],
  "impacts": [
    {
      "code": "AHI",
      "desc": "Aquatic habitat impairment",
      "other": null
    }
  ],
  "causes": [
    {
      "code": "PSI",
      "desc": "Pump Station - Inadequate Capacity",
      "other": null
    }
  ],
  "corrective_actions": [
    {
      "code": "UPS",
      "desc": "Upgrade Pump Station Capacity",
      "other": null
    }
  ],
  "treatment": [],
  "collection_system_name": "PEKIN STP #1 SSCS",
  "percent_collection_system_css": "50",
  "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.