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Illinois / Waters /

McCullom Lake

Lake in Illinois, near McHenry

Current status

Discharge or advisory reported

A discharge is reported as ongoing, a post-discharge period applies, or an official advisory is listed. Open the report for its source, dates and advice. This status since . Why this status, and its source

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.

Square boat markers mark boat launches listed by OpenBoatLaunch.

Bookmark this water page and check it before each trip · Report a missing notice or error

About this status

Discharge or advisory reported: official advisory listed; shown while the authority keeps it in place

Source: McHenry County Health Department (Illinois BeachGuard System) via Illinois BeachGuard System (IDPH): advisories and closures, E. coli results, record 84-20260803T…, updated by the source Nov 6, 2026, 2:41 AM CST, retrieved 2026-11-06 08:41 UTC · Original notice · Updated

Reports behind this status

Reports behind the status of McCullom Lake, newest first
WhenReportStatus
McHenry County Health Department (Illinois BeachGuard System) · Beach closure · volume not reported report · notice · mapto Nov 20, 2:41 AM CST

Sources: Illinois BeachGuard System (IDPH): advisories and closures, E. coli results, retrieved 2026-11-06 08:41 UTC. A report's record id and times show when you hover or focus its "report" link.

Advice in the reports

McHenry County Health Department (Illinois BeachGuard System) · Aug 3, 2026 · Current status: sets this water's status now

“Beach Closed by Operator: Petersen Park Beach”

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.

Beach advisories: 1 period

  • Beach advisory: to the latest update
    1 report: McHenry County Health Department (Illinois BeachGuard System) 1
    Show records

    The records are also in the report table on this page.

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

Reported discharges over time

  • Hours with a discharge or advisory status on McCullom Lake in Illinois, last 12 months2,276Reported on McCullom Lake in Illinois: 0 · Arriving from outfalls upstream, estimated: 0 · Official advisories (beach, algal bloom): 2,276December 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.
  • 2026 season with a discharge or advisory status on McCullom Lake in Illinois49%May to October 2026Share of May 1 to October 31 hours with red status by the map's rules, of the hours a source covered.
  • Records behind the last-90-days strip for McCullom Lake in Illinois1Reported on McCullom Lake in Illinois: 1 · Arriving from outfalls upstream, estimated: 0last 90 daysEvery distinct record the strip lists for its red, yellow and unresolved hours, notices and unresolved reports included; counted as the strip counts them.

Hours with a discharge or advisory status per month

Hours when this water had a discharge or advisory status under DirtyWaterWatch rules.

  • Discharge or advisory reported

Source: il-idph-beachguard. Records cover May 22, 2014 to November 6, 2026.

Show table

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

Source: il-idph-beachguard. Records cover May 22, 2014 to November 6, 2026.

Show table

Share of the May to October season with a discharge or advisory status

Share of the hours from May 1 to October 31 with a discharge or advisory status under DirtyWaterWatch rules.

  • Discharge or advisory reported
  • Season with incomplete source coverage

Seasons with incomplete source coverage: 2014. The share is of the hours a source covered.

Source: il-idph-beachguard. Records cover May 22, 2014 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.

  • il-idph-beachguard: records from May 22, 2014 to the latest update

Reports linked to McCullom Lake

Reports linked to McCullom Lake, newest first
WhenReportStatus
McHenry County Health Department (Illinois BeachGuard System) · Beach closure · volume not reported report · notice · mapto Nov 20, 2:41 AM CST

Download these reports as CSV

All reports in Illinois by year: 2026 (1 here)

Wastewater outlets on this water

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

No wastewater outlet in our records is linked to this water.

Boat launches

Source: OpenBoatLaunch launch records (public agency data and OpenStreetMap, Open Database License).

Nearby waters

Sources covering this water

1 record linked to this water. Updated .