DirtyWaterWatch Public waters. Public record.

Michigan / Sewer operators /

Lenawee County Drain Commission

Sewer operator · Michigan · Brooklyn, Clayton, Hudson, Jasper, Onsted, Weston

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. Square boat markers mark boat launches listed by OpenBoatLaunch.

Federal wastewater discharge permit (NPDES)
MI0053848, MIG580014, MIG580321, MIG580323, MIG580392, MIG580319
Wastewater outlets
13 treatment plant outfalls listed by EPA or state agencies; no combined sewer outfall is listed · List
Waters listed as receiving wastewater
Wolf Creek; Posey Lake Drain; Black Creek; Evans Creek; South Branch Raisin River
Tracked waters
Evans Creek, MI, Posey Lake, MI, South Branch River Raisin, MI, Unnamed tributary to Garrison Drain, MI, Unnamed tributary to River Raisin, MI, Unnamed tributary to River Raisin, MI, Wolf Creek, MI, Wamplers Lake, MI
Discharge records counted
16 records · latest
Total reported volume in these records
42,950 gallons across the 16 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 2026-11-05 01:25 UTC.

Public notices and alerts

Pages where Lenawee County Drain Commission or the state publishes its notices (check them for an alert sign-up):

Its public-notice channels

Source: Lenawee County Drain Commission'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.

13 treatment plant outfalls listed by EPA or state agencies; no combined sewer outfall is listed.

Treatment plant outfalls

13 outfalls

Showing 12 of 13.

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.

Reports and advisories

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

Reports linked to Lenawee County Drain Commission, newest first
WhenReportStatus
Evans Creek · SSO · 5,000 gallons report · notice · mapended
to 4:00 PM“Loch Erin” · Embankment near shoulder of road at [house number removed] Kingsley Drive, Onsted MI 49265 · SSO · 5,000 gallons report · noticeended
to 2:15 PMWamplers Lake · Private Residence Address - Residential grinder tank under deck at above address. · SSO (earlier version) · 6,000 gallons in all mapended
to 2:30 PM“Evans Lake” · Private Residence Address - Shoulder of Rd near listed address, and small groundwater drain pipe to Evans Lake · SSO · 14,000 gallons in all ended
to 10:00 PMWater not mapped · Private Residence Address - Cleanout manhole, next to private drive · SSO · 1,000 gallons report · noticeended
to 8:45 AMWamplers Lake · Private Residence Address - Manhole clean out structure in road right of way. · SSO · 1,000 gallons report · notice · mapended
to 12:00 PM“Loch Erin” · Private Residence Address - Road way ditch. · SSO · 200 gallons report · noticeended
to 3:45 PMWater not mapped · Vacant wood lot of [name removed] - Vacant wood lot. · SSO · 5,000 gallons report · noticeended
to 4:00 PMWater not mapped · Vacant wood lot behind house # [house number removed] Evans Trail - Vacant wooded lot. · SSO · 3,000 gallons report · noticeended
to 3:20 PMWater not mapped · US 12 Right of way. - US 12 Road side. · SSO · 5,000 gallons report · noticeended
to 10:15 PMWater not mapped · Private Residence Address - Manhole in road right of way in front of [house number removed] Cedar St, Brooklyn Mi 49230 · SSO · 1,000 gallons report · noticeended
to 2:30 PMWamplers Lake · Private Residence Address - Dead end manhole clean out structure. · SSO · 1,000 gallons report · notice · mapended
to Sep 5 ’19, 9:30 AM“No water impact” · Private Residence Address - Grinder Pump discharge line · SSO · 250 gallons report · noticeended
to Jul 28 ’19, 9:15 AM“NA” · Private Residence Address - Man hole structure clean out. · SSO · 1,000 gallons report · noticeended
to 3:41 PM“Loch Erin Lake” · Private Residence Address - Drain tile going to Loch Erin Lake. · SSO · 4,000 gallons report · noticeended
to 5:00 PM“Loch Erin” · Private Residence Address - Clean out structure · SSO · 500 gallons report · noticeended

Sources: EGLE MiEnviro CSO/SSO List, retrieved 2026-11-04 15:09 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 Michigan by year: 2026 (1 from Lenawee County Drain Commission) · 2025 (1 from Lenawee County Drain Commission) · 2023 (4 from Lenawee County Drain Commission) · 2022 (1 from Lenawee County Drain Commission) · 2020 (7 from Lenawee County Drain Commission) · 2019 (4 from Lenawee County Drain Commission)

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.

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 2026-11-05 01:25 UTC.

Reported discharges over time

  • Discharges reported by Lenawee County Drain Commission, last 12 months1December 2025 to November 2026Verified reports where available, else notices; revisions and duplicates counted once.
  • Days with a discharge reported by Lenawee County Drain Commission, last 12 months1December 2025 to November 2026A day counts once however many discharges were under way on it.
  • Hours with a discharge or advisory status from Lenawee County Drain Commission's reports, last 12 months0December 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 (Lenawee County Drain Commission)0.0%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. 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

5 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

1 discharge report has no end time and is not marked ongoing; under DirtyWaterWatch rules it shows caution, not a discharge or advisory status, and adds 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

16 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 16 reports that gave a volume as a number.

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

1 discharge report has no end time and is not marked ongoing; under DirtyWaterWatch rules it shows caution, not a discharge or advisory status, and adds 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

1 discharge report has no end time and is not marked ongoing; under DirtyWaterWatch rules it shows caution, not a discharge or advisory status, and adds 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 15, 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