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Illinois / Sewer operators /

Illinois American Water (Rosiclare WWTP)

Sewer utility · Illinois

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.

Ringed dots mark treatment plant outfalls. Small hollow diamonds mark places named in its overflow reports (provisional). Square boat markers mark boat launches listed by OpenBoatLaunch.

Federal wastewater discharge permit (NPDES)
IL0034207
Wastewater outlets
1 treatment plant outfall listed by EPA or state agencies; 1 place named in its own overflow reports (provisional locations) · List
Waters listed as receiving wastewater
Unnamed tributary to Ohio River; Willow Creek
Tracked waters
Ohio River, IL
Discharge records counted
17 records · latest
Total reported volume in these records
217,192 gallons across the 17 records that give a volume

These totals reflect the records we track. Missing volumes and gaps in reporting limit comparisons between operators.

Sources: EPA ECHO and the operator and state sources linked below. Counts use the discharge records on this page. Updated 2026-11-06 09:03 UTC.

Public notices and alerts

We do not list an alert service for this operator yet. Check its website.

Source: Illinois American Water (Rosiclare WWTP)'s public notice and alert pages and the state's notification records.

Report a missing notice or error

Wastewater outlets

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

1 treatment plant outfall listed by EPA or state agencies; 1 place named in its own overflow reports (provisional locations).

Treatment plant outfalls

1 outfall

Source: U.S. Environmental Protection Agency (EPA) permit records (ICIS-NPDES permitted features): where a treatment plant’s permitted discharge leaves. No national source says whether a plant outfall is open or closed.

Places named in overflow reports (provisional)

1 place

Provisional location from overflow reports. Where the operator's own reports put an overflow: a manhole, pump station or plant. Not an outfall listed in a permit.

  • Reported place · 17 overflow reports, latest Jul 27, 2026 · confidence high · no water record yet

Source: the operator's own overflow reports to the state. DirtyWaterWatch groups reports within 50 metres into one place and finds the water below it with U.S. Geological Survey river maps (NLDI, NHDPlus). Not a permitted outfall; provisional until an official outfall record exists.

Reports and advisories

Sanitary sewer overflow (SSO): sewage spills from a sewer meant to carry sewage separately from rainwater.

Reports linked to Illinois American Water (Rosiclare WWTP), newest first
WhenReportStatus
to 10:32 AM CDT“Willow Creek” · SSO · 4,800 gallons report · notice · mapended
to 2:40 PM CDTOhio River · SSO · 23,000 gallons report · notice · mapended
to 10:14 AM CDT“Willow Creek” · SSO · 4,200 gallons report · notice · mapended
to 3:00 PM CSTOhio River · SSO · 2,400 gallons report · notice · mapended
to 1:02 PM CSTOhio River · SSO · 5,467 gallons report · notice · mapended
to 12:00 PM CSTOhio River · SSO · 20,000 gallons report · notice · mapended
to 1:24 PM CDT“Willow Creek” · SSO · 2,000 gallons report · notice · mapended
to 10:00 PM CDT“Willow Creek” · SSO · 2,600 gallons report · notice · mapended
to 4:12 AM CDT“Willow Creek” · SSO · 4,650 gallons report · notice · mapended
to 10:02 PM CDT“Willow Creek” · SSO · 2,750 gallons report · notice · mapended
to 10:18 AM CDT“Willow Creek” · SSO · 7,200 gallons report · notice · mapended
to 10:18 PM CDT“Willow Creek” · SSO · 2,125 gallons report · notice · mapended
to Apr 7 ’25, 4:48 AM CDT“Willow Creek” · SSO · 97,500 gallons report · notice · mapended
to 5:22 PM CDT“Willow Creek” · SSO · 17,500 gallons report · notice · mapended
to 7:10 AM CDT“Willow Creek” · SSO · 13,000 gallons report · notice · mapended
to 4:12 AM CDT“Willow Creek” · SSO · 4,000 gallons report · notice · mapended
to 9:52 AM CDT“Willow Creek” · SSO · 4,000 gallons report · notice · mapended

Sources: EPA ECHO Sewer Overflow and Bypass Event report (reported to regulators), retrieved 2026-11-06 08:38 UTC. A report's record id and times show when you hover or focus its "report" link.

Download these reports as CSV

All reports in Illinois by year: 2026 (6 from Illinois American Water (Rosiclare WWTP)) · 2025 (11 from Illinois American Water (Rosiclare WWTP))

Other sewer operators on these waters

The last 90 days

Last 90 days, hour by hour. Red: discharge or advisory reported. Amber: caution. Hatched amber: end not confirmed. Plum: algal bloom advisory. Red or amber with a light line inside: beach advisory or caution. Dotted: monthly report (days with discharge, dates not given). Grey: no current status on the water outline. Purple hatching: a status resting on a source that could not be checked on schedule.

No discharge, advisory or caution periods are shown for the waters this sewer operator's reports were placed on in this time span. Check downstream stretches and source coverage.

Source: DirtyWaterWatch calculations using the reports named above and the published status rules. Updated 2026-11-06 09:03 UTC.

Reported discharges over time

  • Discharges reported by Illinois American Water (Rosiclare WWTP), last 12 months6December 2025 to November 2026Verified reports where available, else notices; revisions and duplicates counted once.
  • Days with a discharge reported by Illinois American Water (Rosiclare WWTP), last 12 months5December 2025 to November 2026A day counts once however many discharges were under way on it.
  • Hours with a discharge or advisory status from Illinois American Water (Rosiclare WWTP)'s reports, last 12 months30December 2025 to November 2026Red hours by the map's rules: each discharge to its reported end plus the state's post-discharge period; overlapping hours count once.

Combined sewer overflow (CSO): sewage mixed with rainwater spills from a shared sewer system. Treatment bypass: wastewater skips one or more treatment steps. Blended discharge: wastewater that skipped some treatment is mixed with treated wastewater.

Reported discharges per month

17 reported discharges, January 2022 to November 2026.

  • Combined sewer overflow
  • Sanitary sewer overflow
  • Treatment bypass, blended or other
  • No tracked source for this period
  • Incomplete source coverage
Limited records

No tracked source covers January 2022 to April 2022. The U.S. Environmental Protection Agency's sewer overflow records are limited: they hold only what operators file with the agency.

Source: U.S. Environmental Protection Agency sewer overflow records. Records cover May 3, 2022 to November 6, 2026.

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Hours with a discharge or advisory status per month

Hours when a water had a discharge or advisory status from this sewer operator's reports, under DirtyWaterWatch rules.

  • Discharge or advisory reported
  • No tracked source for this period
  • Incomplete source coverage
Limited records

No tracked source covers January 2022 to April 2022. Official beach and cyanobacteria (harmful blue-green algae) advisories are counted on water pages only. The U.S. Environmental Protection Agency's sewer overflow records are limited: they hold only what operators file with the agency.

Source: U.S. Environmental Protection Agency sewer overflow records. Records cover May 3, 2022 to November 6, 2026.

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Days with a reported discharge per month

A day counts when any counted discharge was under way on it, from its start to its reported end in Eastern Time; a report with no end counts its start day.

  • No tracked source for this period
  • Incomplete source coverage
Limited records

No tracked source covers January 2022 to April 2022.

Source: U.S. Environmental Protection Agency sewer overflow records. Records cover May 3, 2022 to November 6, 2026.

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Reported volume per year

Gallons (axis: K thousand, M million), summed from the 17 reports that gave a volume as a number.

  • Incomplete source coverage
Limited records

Source: U.S. Environmental Protection Agency sewer overflow records. Records cover May 3, 2022 to November 6, 2026.

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Hours with a discharge or advisory status per year

Hours with a discharge or advisory status each year under DirtyWaterWatch rules; 2026 to date.

  • Discharge or advisory reported
  • Incomplete source coverage
Limited records

Official beach and cyanobacteria (harmful blue-green algae) advisories are counted on water pages only.

Source: U.S. Environmental Protection Agency sewer overflow records. Records cover May 3, 2022 to November 6, 2026.

Show table

Reported discharges by calendar month, all years

Every counted discharge report, by the calendar month it began.

Months are summed over every year a tracked source covers; the table gives the number of years behind each month.

Source: U.S. Environmental Protection Agency sewer overflow records. Records cover May 3, 2022 to November 6, 2026.

Show table
How these charts are counted

We count each discharge once. Where a source publishes notices and confirmed reports, we use confirmed reports for an operator's month when available; otherwise we use notices. We combine revisions and exclude duplicate state reports copied by the U.S. Environmental Protection Agency (EPA). Monthly and yearly totals appear separately. Status hours follow this site's rules. Shaded gaps mean missing coverage, not zero discharges.

  • U.S. Environmental Protection Agency sewer overflow records: records from May 3, 2022 to the latest update (limited records)