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Michigan / Sewer operators /

South Huron Valley Utility Authority

Sewer operator · Michigan · Rockwood

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)
MI0043800
Wastewater outlets
2 treatment plant outfalls listed by EPA or state agencies; no combined sewer outfall is listed · List
Waters listed as receiving wastewater
Detroit River
Tracked waters
Detroit River, MI
Discharge records counted
50 records · latest
Total reported volume in these records
108,330,717,370 gallons across the 50 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 South Huron Valley Utility Authority or the state publishes its notices (check them for an alert sign-up):

Its public-notice channels

Source: South Huron Valley Utility Authority'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; no combined sewer outfall is listed.

Treatment plant outfalls

2 outfalls
  • Outfall 001 · receiving water in the permit: Detroit River · Detroit River, MI · status not published
  • Outfall SLD · receiving water in the permit: Detroit River · no water record yet · status not published

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

Treatment bypass: wastewater skips one or more treatment steps. Sanitary sewer overflow (SSO): sewage spills from a sewer meant to carry sewage separately from rainwater.

Reports linked to South Huron Valley Utility Authority, newest first
WhenReportStatus
to Apr 4 ’25, 5:30 AMDetroit River · Outfall A - Detroit River · Bypass · 8.94 million gallons report · notice · mapended
to Apr 13 ’24, 12:17 AMDetroit River · 001 a · Bypass · 6.6 million gallons report · notice · mapended
to Jan 27 ’24, 12:30 AMDetroit River · 001 Outfall 001 discharge to Detroit River · Bypass · 15.17 million gallons report · notice · mapended
to Aug 25 ’23, 12:56 AM“Huron River via unnamed ditch” · Unnamed ditch West of facility pump house. - Unnamed ditch West of facility pump house · SSO · 625,000 gallons report · noticeended
to Aug 26 ’23, 5:27 PMDetroit River · 001 Detroit River at Latitude 42.05250, Longitude -83.16388 · Bypass · 82 million gallons report · notice · mapended
to Aug 25 ’23, 10:23 AM“Huron River” · SHVUA Interceptor Sewer - Swallow Drive downstream/North of Rockwood WWTP in Rockwood, MI South of [house number removed] Swallow Drive · SSO · 38,075 gallons report · noticeended
to 4:21 PMWater not mapped · Odette Lift Station - Manhole leading into Odette Lift Station · SSO · 45,300 gallons report · noticeended
to 6:24 AMDetroit River · Detroit River · Bypass · 2.63 million gallons report · notice · mapended
to 11:44 AMDetroit River · Detroit River · Bypass · 6.46 million gallons report · notice · mapended
to Feb 24 ’23, 2:16 AMDetroit River · Detroit River · Bypass · 18.5 million gallons report · notice · mapended
to 10:00 AMWater not mapped · Odette lift station - Area around the Odette Lift station which is currently under construction · SSO · 1,389 gallons report · noticeended
to 1:19 AM“Unnamed ditch to the West of the WWTP. ~ 190' long by ~20' wide for ~170' of the length and ~30' wide for ~20' of the length.” · Unnamed Ditch - Unnamed ditch to the West of the WWTP. ~ 190' long by ~20' wide for ~170' of the length and ~30' wide for ~20' of the length. · Bypass · 14,960 gallons in all ended
to Mar 29 ’20, 1:35 PMDetroit River · Bypass around Secondary Treatment Units, blending with final effluent - SHVUA WWTP Outfall 001 to the Detroit River · Bypass · 8.92 million gallons report · notice · mapended
to Jan 12 ’20, 6:45 AMDetroit River · 001 Outfall 001 discharges to the Detroit River at Latitude 42.05250, Longitude -83.16388 · Bypass · 910,000 gallons report · notice · mapended
to Oct 27 ’19, 12:24 AMDetroit River · 001A SHVUA WWTP Outfall 001 to the Detroit River. · Bypass · 340,000 gallons report · notice · mapended
to 8:40 AMDetroit River · 001A Outfall 001 discharges to the Detroit River at Latitude 42.05250, Longitude -83.16388 · Bypass · 6.43 million gallons report · notice · mapended
to 3:00 PMWater not mapped · W. Jefferson, 100 yds. South of Middle Gibralta Rd. - Close to an air release valve · SSO · 2,750 gallons report · noticeended
to Apr 16 ’18, 8:38 PMDetroit River · WWTP Sec. Bypass - Bypass around secondary treatment units · Bypass · 23.43 million gallons report · notice · mapended
to Feb 22 ’18, 7:24 AMDetroit River · WWTP Sec. Bypass - Bypass around secondary treatment units · Bypass · 24.3 million gallons report · notice · mapended
to Jan 21 ’18, 3:15 PM“Huron River” · Odette Pump Station - Pump Station · SSO · 5,800 gallons report · noticeended
to 8:35 AM“Huron River” · Odette Pump Station - Pump Station · SSO · 2,400 gallons report · noticeended
to 11:31 PMDetroit River · WWTP Sec. Bypass - Bypass around secondary treatment units · Bypass · 71,250 gallons report · notice · mapended
to 10:04 AMDetroit River · WWTP Sec. Bypass - Bypass around secondary treatment units · Bypass · 3.27 million gallons report · notice · mapended
to Jun 1 ’15, 1:47 AMDetroit River · WWTP Sec. Bypass - Bypass around secondary treatment units · SSO · 2.93 million gallons report · notice · mapended

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

Showing the latest 25 records of 50 records.See them all with filters.

All reports in Michigan by year: 2025 (1 from South Huron Valley Utility Authority) · 2024 (2 from South Huron Valley Utility Authority) · 2023 (7 from South Huron Valley Utility Authority) · 2022 (3 from South Huron Valley Utility Authority) · 2020 (2 from South Huron Valley Utility Authority) · 2019 (2 from South Huron Valley Utility Authority) · 2018 (4 from South Huron Valley Utility Authority) · 2017 (3 from South Huron Valley Utility Authority) · 2015 (1 from South Huron Valley Utility Authority) · 2014 (1 from South Huron Valley Utility Authority) · 2013 (1 from South Huron Valley Utility Authority) · 2011 (3 from South Huron Valley Utility Authority) · 2009 (2 from South Huron Valley Utility Authority) · 2008 (2 from South Huron Valley Utility Authority) · 2007 (3 from South Huron Valley Utility Authority) · 2006 (1 from South Huron Valley Utility Authority) · 2005 (5 from South Huron Valley Utility Authority) · 2004 (2 from South Huron Valley Utility Authority) · 2003 (3 from South Huron Valley Utility Authority) · 2001 (2 from South Huron Valley Utility Authority)

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 South Huron Valley Utility Authority, last 12 months0December 2025 to November 2026Verified reports where available, else notices; revisions and duplicates counted once.
  • Days with a discharge reported by South Huron Valley Utility Authority, last 12 months0December 2025 to November 2026A day counts once however many discharges were under way on it.
  • Hours with a discharge or advisory status from South Huron Valley Utility Authority'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 (South Huron Valley Utility Authority)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. Blended discharge: wastewater that skipped some treatment is mixed with treated wastewater.

Reported discharges per month

13 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.

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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 4, 2026.

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Reported discharges per year, 2001 to 2026

50 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 49 reports that gave a volume as a number (1 did not).

1 of 50 discharge reports gave no volume as a number; only numbers are summed. 1 report gives more than 5 billion gallons for a single discharge, which looks like an entry error; it is not summed.

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

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.

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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

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.

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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 4, 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.

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