DirtyWaterWatch Public waters. Public record.

Michigan / Waters /

Lake Saint Clair

Lake in Michigan, near Algonac, Anchor Bay Shores, Copeland Corner, Grosse Pointe Farms, Grosse Pointe Park, Grosse Pointe Shores, Harrison Charter Township, Lakeside, New Baltimore, North Island and Pearl Beach

Current status

Discharge possible: heavy rain, no report received

Radar shows that recent rain at a combined sewer system's outlets has reached the amount set for that system, and its operator has not reported a discharge. It reads "discharge likely" where the amount is the one at which that system has discharged before, or a rain trigger its state publishes, and "discharge possible" where only this site's default of 0.1 inch applies. This is an estimate, not a report. 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. Dashed river stretches are estimates.

Check GROSSE POINTE FARMS's notices · Bookmark this water page and check it before each trip · Report a missing notice or error

About this status

Discharge possible: heavy rain, no report received: heavy rain at a sewer operator's outlets reached this site's default amount, and no report received; shown for 48 hours after the rain (site rule). 5.2 in of rain fell in the 24 hours to Nov 5, 2026, 1:00 AM EST at Macomb County Public Works Office (MARTIN RTB)'s outfalls (NOAA radar estimate).

Source: NOAA National Weather Service, MRMS radar-only rainfall estimate, valid Nov 5, 2026, 1:00 AM EST, retrieved 2026-11-05 06:22 UTC; threshold: site default; rule: How it works, discharge likely or possible. · Updated

Estimated downstream stretches on Lake Saint Clair

none from a report; 12 routes below outlets with a status

No stretch below a reported discharge has a current status here as of Nov 5, 2026, 1:27 AM EST. The routes below wastewater outlets carry the status shown on each.

Estimated routes below wastewater outlets

12 routes below outlets
  • Caution Permit MI0025453, outlet 001 · 40 kilometres estimated · Estimate stops here
  • Caution Permit MI0026077, outlet 001 · 31.122 kilometres estimated · Estimate stops here
  • Caution Permit MI0026077, outlet 002 · 31.122 kilometres estimated · Estimate stops here
  • Caution Permit MI0026077, outlet 003 · 31.122 kilometres estimated · Estimate stops here
  • Caution Permit MI0026077, outlet 004 · 31.122 kilometres estimated · Estimate stops here
  • Caution Permit MI0026077, outlet 005 · 31.122 kilometres estimated · Estimate stops here
  • Caution Permit MI0026077, outlet 006 · 31.122 kilometres estimated · Estimate stops here
  • Caution Permit MI0026077, outlet 007 · 31.122 kilometres estimated · Estimate stops here
  • Caution Permit MI0026085, outlet 001 · 33.072 kilometres estimated · Estimate stops here
  • Caution Permit MI0026085, outlet 002 · 33.072 kilometres estimated · Estimate stops here
  • Caution Permit MI0026085, outlet 003 · 33.072 kilometres estimated · Estimate stops here
  • Caution Permit MI0026085, outlet 004 · 33.072 kilometres estimated · Estimate stops here

Source: DirtyWaterWatch estimates using U.S. Geological Survey river maps and flow measurements. The estimate stops at tidal water, the first lake or the distance limit.

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: source update overdue.

Source: DirtyWaterWatch calculations using the reports named above and the published status rules. Updated 2026-11-05 06:27 UTC.

Reported discharges over time

  • Discharges affecting Lake Saint Clair in Michigan, last 12 months88 affecting this lake: 8 reported on Lake Saint Clair; none arriving from upstreamDecember 2025 to November 2026Verified reports where available, else notices; revisions and duplicates counted once. Arriving discharges are estimated from modeled downstream reaches.
  • Days with a discharge affecting Lake Saint Clair in Michigan, last 12 months9Reported on Lake Saint Clair in Michigan: 9 · Arriving from outfalls upstream, estimated: 0 (counted apart; together they need not equal the total)December 2025 to November 2026A day counts once however many discharges were under way on it.
  • Hours with a discharge or advisory status on Lake Saint Clair in Michigan, last 12 months94Reported on Lake Saint Clair in Michigan: 94 · Arriving from outfalls upstream, estimated: 0December 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 Lake Saint Clair in Michigan0.5%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 Lake Saint Clair in Michigan6Reported on Lake Saint Clair in Michigan: 3 · Arriving from outfalls upstream, estimated: 0 · Other records (rain-likely and similar): 3last 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.

Combined sewer overflow (CSO): sewage mixed with rainwater spills from a shared sewer system. Sanitary sewer overflow (SSO): sewage spills from a sewer meant to carry sewage separately from rainwater. Treatment bypass: wastewater skips one or more treatment steps. Blended discharge: wastewater that skipped some treatment is mixed with treated wastewater. Outfall: a pipe or outlet where wastewater enters a water body.

Reported discharges per month

71 reported discharges, January 2022 to November 2026.

  • Combined sewer overflow
  • Sanitary sewer overflow
  • Treatment bypass, blended or other

Source: mi-egle-mienviro-cso-sso-list. Records cover January 1, 2022 to November 5, 2026.

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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

8 discharge reports have no end time and are not marked ongoing; under DirtyWaterWatch rules they show caution, not a discharge or advisory status, and add no hours here. 1 discharge reported to last more than 31 days is counted as 31 days.

Source: mi-egle-mienviro-cso-sso-list. Records cover January 1, 2001 to November 5, 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.

Source: mi-egle-mienviro-cso-sso-list. Records cover January 1, 2022 to November 5, 2026.

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Reported discharges per year, 2001 to 2026

415 reported discharges, 2001 to 2026.

  • Combined sewer overflow
  • Sanitary sewer overflow
  • Treatment bypass, blended or other

Source: mi-egle-mienviro-cso-sso-list. Records cover January 1, 2001 to November 5, 2026.

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Reported volume per year

Gallons (axis: K thousand, M million), summed from the 411 reports that gave a volume as a number (4 did not).

4 of 415 discharge reports gave no volume as a number; only numbers are summed.

Source: mi-egle-mienviro-cso-sso-list. Records cover January 1, 2001 to November 5, 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

8 discharge reports have no end time and are not marked ongoing; under DirtyWaterWatch rules they show caution, not a discharge or advisory status, and add no hours here. 1 discharge reported to last more than 31 days is counted as 31 days.

Source: mi-egle-mienviro-cso-sso-list. Records cover January 1, 2001 to November 5, 2026.

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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

8 discharge reports have no end time and are not marked ongoing; under DirtyWaterWatch rules they show caution, not a discharge or advisory status, and add no hours here. 1 discharge reported to last more than 31 days is counted as 31 days.

Source: mi-egle-mienviro-cso-sso-list. Records cover January 1, 2001 to November 5, 2026.

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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: mi-egle-mienviro-cso-sso-list. Records cover January 1, 2001 to November 5, 2026.

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Reported discharges by wastewater outlet

Wastewater outlets with the most tracked discharge records: 10 of 22, all years. Counts depend on reporting coverage and do not measure legal compliance or harm.

Source: mi-egle-mienviro-cso-sso-list. Records cover January 1, 2001 to November 5, 2026.

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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)
  • mi-egle-mienviro-cso-sso-list: records from January 1, 2001 to the latest update

Reports linked to Lake Saint Clair

Reports linked to Lake Saint Clair, newest first
WhenReportStatus
Macomb County Public Works Office · CSO · 6.3 million gallons report · notice · mapended
to Sep 4, 12:10 AMMacomb County Public Works Office · 001 001 · CSO · 35.6 million gallons report · notice · mapended
to 6:26 PMMilk River Intercounty Drain Drainage District · 001 Milk River · CSO · 33.4 million gallons report · notice · mapended
to Apr 17, 8:05 AMMilk River Intercounty Drain Drainage District · 001 Milk River · CSO · 27.5 million gallons report · notice · mapended
to Apr 17, 3:18 AMMacomb County Public Works Office · 001 Retention Treatment Basin monitoring point · CSO · 30.66 million gallons report · notice · mapended
to 8:35 PMMacomb County Public Works Office · 001 Retention Treatment Basin monitoring point · CSO · 7.6 million gallons report · notice · mapended
to Mar 7, 11:43 AMMilk River Intercounty Drain Drainage District · 001 Milk River · CSO · 36.4 million gallons report · notice · mapended
to Mar 6, 1:30 AMMacomb County Public Works Office · 001 Retention Treatment Basin monitoring point · CSO · 7 million gallons report · notice · mapended
to 9:45 PMMacomb County Public Works Office · 001 001 · CSO · 7.91 million gallons report · notice · mapended
to Jul 29 ’25, 4:50 AMMacomb County Public Works Office · 001 Retention Treatment Basin monitoring point · CSO · 26.2 million gallons report · notice · mapended
to 7:17 PMMilk River Intercounty Drain Drainage District · 001 Milk River · CSO · 27.6 million gallons report · notice · mapended
to Jun 19 ’25, 5:10 AMMacomb County Public Works Office · 001 Retention Treatment Basin monitoring point · CSO · 12 million gallons report · notice · mapended
to Jun 19 ’25, 2:20 AMMacomb County Public Works Office · 001 001 · CSO · 18.96 million gallons report · notice · mapended
to Jun 20 ’25, 12:28 AMMilk River Intercounty Drain Drainage District · 001 Milk River · CSO · 18.4 million gallons report · notice · mapended
to 11:40 AMMacomb County Public Works Office · 001 001 · CSO · 66.9 million gallons in all mapended
to 7:26 AMVillage of Grosse Pointe Shores · Cook Road Lift Station - Cook Road Lift Station Relief Outfal · SSO · 766,000 gallons report · notice · mapended
to Apr 3 ’25, 8:15 AMMilk River Intercounty Drain Drainage District · 001 Milk River · CSO · 82.5 million gallons report · notice · mapended
to Apr 3 ’25, 11:58 PMMacomb County Public Works Office · 001 Retention Treatment Basin monitoring point · CSO · 77.5 million gallons report · notice · mapended
to Dec 30 ’24, 7:55 AMMacomb County Public Works Office · 001 001 · CSO · 22.1 million gallons report · notice · mapended
to Dec 30 ’24, 3:35 PMMacomb County Public Works Office · 001 Retention Treatment Basin monitoring point · CSO · 45.7 million gallons report · notice · mapended
to Dec 30 ’24, 7:12 AMMilk River Intercounty Drain Drainage District · 001 Milk River · CSO · 45.8 million gallons report · notice · mapended
to 9:00 AMMilk River Intercounty Drain Drainage District · 001 Milk River · CSO · 21.7 million gallons report · notice · mapended
to 9:35 PMMacomb County Public Works Office · 001 001 · CSO · 13 million gallons report · notice · mapended
to Aug 7 ’24, 5:55 AMMacomb County Public Works Office · 001 Retention Treatment Basin monitoring point · CSO · 37.2 million gallons report · notice · mapended

Sources: EGLE MiEnviro CSO/SSO List, retrieved 2026-11-05 06:11 UTC. A report's record id and times show when you hover or focus its "report" link.

Download these reports as CSV

Showing the latest 25 records of 415 records.See them all with filters.

All reports in Michigan by year: 2026 (8 here) · 2025 (11 here) · 2024 (30 here) · 2023 (16 here) · 2022 (6 here) · 2021 (31 here) · 2020 (26 here) · 2019 (21 here) · 2018 (20 here) · 2017 (12 here) · 2016 (18 here) · 2015 (13 here) · 2014 (17 here) · 2013 (14 here) · 2012 (5 here) · 2011 (30 here) · 2010 (9 here) · 2009 (20 here) · 2008 (17 here) · 2007 (14 here) · 2006 (20 here) · 2005 (8 here) · 2004 (5 here) · 2003 (8 here) · 2002 (11 here) · 2001 (25 here)

Wastewater outlets on this water

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

Sewer operators listed for this water: GROSSE POINTE FARMS, GROSSE POINTE SHORES CSO, Macomb County Public Works Office (MARTIN RTB), Macomb County Public Works Office (CHAPATON RTB), Milk River Intercounty Drain Drainage District (MILK RIVER CSO RTB), Village of Grosse Pointe Shores.

Boat launches

Source: OpenBoatLaunch launch records (public agency data and OpenStreetMap, Open Database License). · Lake Saint Clair on OpenBoatLaunch

Nearby waters

Sources covering this water

415 records linked to this water. Updated .