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Michigan / Sewer operators /

City of Flint

Sewer operator · Michigan · Flint

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)
MI0022926, 3112a-0395
Wastewater outlets
2 treatment plant outfalls listed by EPA or state agencies; 2 places named in its own overflow reports (provisional locations) · List
Waters listed as receiving wastewater
Flint River
Tracked waters
Flint River, MI, Park Lake, MI
Discharge records counted
241 records · latest
Total reported volume in these records
2,999,535,121 gallons across the 233 records that give a volume (8 without one)

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 2026-11-05 01:25 UTC.

Public notices and alerts

Pages where City of Flint or the state publishes its notices (check them for an alert sign-up):

Its public-notice channels

Source: City of Flint's public notice and alert pages and the state's notification records; DirtyWaterWatch register of public-notice channels and its page monitor.

Report a missing notice or error

Wastewater outlets

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

2 treatment plant outfalls listed by EPA or state agencies; 2 places named in its own overflow reports (provisional locations).

Treatment plant outfalls

2 outfalls

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)

2 places · 1 not on the map (reports say the sewage reached no water)

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 · 1 overflow report, latest Oct 25, 2021 · confidence medium · no water record yet
  • Reported place · 1 overflow report, latest Mar 5, 2011 · confidence medium · no water record yet · not on the map: its reports say the sewage did not reach a water

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. Treatment bypass: wastewater skips one or more treatment steps.

Reports linked to City of Flint, newest first
WhenReportStatus
Flint River · SSO · volume not reported report · notice · mapto Nov 22, 10:00 AM
to 10:20 AMFlint River · Northwest Pumping Station - Flint River · SSO · 1,000 gallons report · notice · mapended
to 12:30 PMWater not mapped · Flint river flint mi - Lexington and fenton rd flint mi · SSO · 10 gallons report · noticeended
to 11:50 PMFlint River · Third Avenue Pumping Station overflow outfall - Third Avenue Pumping Station overflow outfall; East bank of the Flint River · SSO · 500,000 gallons report · notice · mapended
Water not mapped · flint river flint mi - university ave and n grand traverse · SSO · 10 gallons report · noticeended
to Apr 19, 7:22 AMFlint River · 003 Flint River · Bypass · 82.75 million gallons report · notice · mapended
to 10:00 PMFlint River · Third Avenue Pumping Station overflow outfall - Third Avenue Pumping Station overflow outfall; East bank of the Flint River · SSO · 14.4 million gallons report · notice · mapended
to Apr 11, 7:01 AMFlint River · 003 Flint River · Bypass · 188.92 million gallons report · notice · mapended
to Apr 7, 4:30 AMFlint River · Third Avenue Pumping Station overflow outfall - Third Avenue Pumping Station overflow outfall; East bank of the Flint River · SSO · 68.3 million gallons report · notice · mapended
to 3:30 PMFlint River · Third Avenue Pumping Station overflow outfall - Third Avenue Pumping Station overflow outfall; East bank of the Flint River · SSO · 12.83 million gallons report · notice · mapended
to 6:30 PMWater not mapped · flint river flint mi - paterson and mason flint mi · SSO · 20 gallons report · noticeended
to 12:15 PMWater not mapped · flint river flint mi - edgemont ave and sunset dr flint mi · SSO · 10 gallons report · noticeended
to Mar 8, 5:10 PMFlint River · 003 Flint River · Bypass · 11.01 million gallons report · notice · mapended
to Mar 7, 4:30 PMFlint River · Third Avenue Pump Station (University Avenue) - Outfall along the East bank of the Flint River · SSO · 13.73 million gallons report · notice · mapended
to Mar 7, 12:00 AMFlint River · Storm Sewer Outfall #5 - The storm sewer outfall just East of the Linden Road bridge, along the South bank of the Flint River. · SSO · 250 gallons report · notice · mapended
to 1:00 PMFlint River · Flint River · SSO · 200 gallons report · notice · mapended
to 2:45 PMWater not mapped · flint river flint mi - [house number removed] Greenbrook ln · SSO · 20 gallons report · noticeended
to Feb 4, 1:00 AMWater not mapped · Flint river flint mi - [house number removed] lapeer rd flint · SSO · 40 gallons report · noticeended
to Dec 30 ’25, 1:08 AMFlint River · 003 Flint River · Bypass · 19.98 million gallons report · notice · mapended
Water not mapped · Flint river flint mi - 1 hurley plaza flint mi · SSO · 5 gallons report · noticeended
to 8:45 AMWater not mapped · flint river flint mi · SSO · 5 gallons report · noticeended
Water not mapped · flint river flint mi - [house number removed] e first st flint mi · SSO · 5 gallons report · noticeended
to 5:30 PMWater not mapped · flint river flint mi - [house number removed] n dort hwy flint mi · SSO · 20 gallons report · noticeended
to Jun 22 ’25, 11:34 PMFlint River · 003 Flint River · Bypass · 24.79 million gallons report · notice · mapended
to 2:40 PMWater not mapped · Flint river flint mi - Albert T Horrigan/E Court st flint mi · SSO · 5 gallons report · noticeended

Sources: EGLE MiEnviro CSO/SSO List, retrieved 2026-11-05 01:07 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 241 records.See them all with filters.

All reports in Michigan by year: 2026 (18 from City of Flint) · 2025 (20 from City of Flint) · 2024 (25 from City of Flint) · 2023 (26 from City of Flint) · 2022 (33 from City of Flint) · 2021 (24 from City of Flint) · 2020 (7 from City of Flint) · 2019 (2 from City of Flint) · 2018 (11 from City of Flint) · 2017 (7 from City of Flint) · 2016 (4 from City of Flint) · 2015 (1 from City of Flint) · 2014 (4 from City of Flint) · 2013 (5 from City of Flint) · 2012 (2 from City of Flint) · 2011 (8 from City of Flint) · 2010 (3 from City of Flint) · 2009 (7 from City of Flint) · 2008 (5 from City of Flint) · 2007 (1 from City of Flint) · 2006 (3 from City of Flint) · 2005 (1 from City of Flint) · 2004 (8 from City of Flint) · 2003 (5 from City of Flint) · 2002 (3 from City of Flint) · 2001 (8 from City of Flint)

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: source update overdue.
  • End not confirmed: to the latest update
    1 report: Flint River 1
    Show records

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

  • Discharge or advisory reported: to
    1 report: Flint River 1
    Show records

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

  • Caution: to
    1 report: Flint River 1
    Show records

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

  • Discharge or advisory reported: to
    1 report: Flint River 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 2026-11-05 01:25 UTC.

Reported discharges over time

  • Discharges reported by City of Flint, last 12 months20December 2025 to November 2026Verified reports where available, else notices; revisions and duplicates counted once.
  • Days with a discharge reported by City of Flint, last 12 months31December 2025 to November 2026A day counts once however many discharges were under way on it.
  • Hours with a discharge or advisory status from City of Flint's reports, last 12 months548December 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 (City of Flint)3.8%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.

Combined sewer overflow (CSO): sewage mixed with rainwater spills from a shared sewer system. Blended discharge: wastewater that skipped some treatment is mixed with treated wastewater.

Reported discharges per month

122 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 4, 2026.

Show table

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

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

Source: mi-egle-mienviro-cso-sso-list. Records cover January 1, 2001 to November 4, 2026.

Show table

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 4, 2026.

Show table

Reported discharges per year, 2001 to 2026

241 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 4, 2026.

Show table

Reported volume per year

Gallons (axis: K thousand, M million), summed from the 233 reports that gave a volume as a number (8 did not).

8 of 241 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 4, 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

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

Source: mi-egle-mienviro-cso-sso-list. Records cover January 1, 2001 to November 4, 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

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

Source: mi-egle-mienviro-cso-sso-list. Records cover January 1, 2001 to November 4, 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: mi-egle-mienviro-cso-sso-list. Records cover January 1, 2001 to November 4, 2026.

Show table

Reported discharges by wastewater outlet

Wastewater outlets with the most tracked discharge records: 10 of 149, 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 4, 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.

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