NPDES MI0043800 · Clean Water Act
SOUTH HURON VALLEY UTILITY AUTHORITY WWTP, Rockwood, MI: NPDES MI0043800 discharge permit, effluent exceedances, inspections, penalties
SOUTH HURON VALLEY UTILITY AUTHORITY WWTP, Rockwood, Michigan: Individual permit MI0043800, held by South Huron Valley Utility Authority; Publicly owned treatment works; Administratively continued; issued November 7, 2018, term to October 1, 2022, by State; discharges to Detroit River; Sewage Treatment Facilities.
15 of the 30 pollutants listed for NPDES MI0043800 have no violation or effluent exceedance.
- Solids, total suspended: 4 limits, 30 violations of any kind, 14 effluent exceedances, latest November 30, 2024, largest 320% over the limit.
- Mercury, total [as Hg]: 6 limits, 24 violations of any kind, 14 effluent exceedances, latest December 31, 2017, largest 7,567% over the limit.
- Phosphorus, total [as P]: 4 limits, 16 violations of any kind, 10 effluent exceedances, latest December 31, 2018, largest 70% over the limit.
- Solids, suspended percent removal: 2 limits, 8 violations of any kind, 4 effluent exceedances, latest April 30, 2009, largest 220% over the limit.
- pH: 2 limits, 11 violations of any kind, 3 effluent exceedances, latest July 31, 2026.
- TU Static 24 Hr Acute Pimephales promelas: 1 limit, 3 violations of any kind, 3 effluent exceedances, latest February 28, 2021, largest 50% over the limit.
- Coliform, fecal general: 2 limits, 10 violations of any kind, 2 effluent exceedances, latest July 31, 2026, largest 205% over the limit.
- BOD, carbonaceous [5 day, 20 C]: 4 limits, 17 violations of any kind, 1 effluent exceedance, latest April 30, 2009, largest 10% over the limit.
- Flow, in conduit or thru treatment plant: 2 limits, 8 violations of any kind.
- Copper, total [as Cu]: 0 limits, 7 violations of any kind.
- Nitrogen, ammonia total [as N]: 4 limits, 4 violations of any kind.
- BOD, carb-5 day, 20 deg C, percent removal: 2 limits, 4 violations of any kind.
- Oxygen, dissolved [DO]: 1 limit, 4 violations of any kind.
- Chlorine, total residual: 1 limit, 4 violations of any kind.
- Zinc, total [as Zn]: 0 limits, 4 violations of any kind.
- Solids, total: 3 limits.
- Arsenic, dry weight: 3 limits.
- Selenium, dry weight: 3 limits.
- Copper, dry weight: 3 limits.
- Cadmium, dry weight: 3 limits.
- Nitrogen, total Kjeldahl: 3 limits.
- Molybdenum, sludge, total, dry weight [as Mo]: 3 limits.
- Zinc, sludge, total, dry weight [as Zn]: 3 limits.
- Lead, sludge, total, dry weight [as Pb]: 3 limits.
- Nickel, sludge, total, dry weight [as Ni]: 3 limits.
- Nitrogen, sludge, total, dry weight [as N]: 3 limits.
- Mercury, sludge, total, dry weight [as Hg]: 3 limits.
- Potassium, sludge, total, dry weight [as K]: 3 limits.
- Phosphorus, sludge, total, dry weight [as P]: 3 limits.
- Cyanide [A]: 2 limits.
- October 6, 2026: Evaluation (S).
- September 2, 2026: Notice of Violation (State).
- April 3, 2026: Letter of Violation/ Warning Letter (State).
- March 3, 2026: Sampling (S).
- June 23, 2025: Monitoring Violations - Improper Analysis or Lab Error (ST6).
- June 23, 2025: Monitoring Violations - Invalid/Unrepresentative Sample (ST6).
- January 1, 2024: Failure to enforce standards, local limits, and reporting requirements (>15% SNC SIU) (Level II) (ST6).
- November 21, 2022: Reporting Violations - Late Submittal of DMRs (ST6).
- July 22, 2022: Reporting Violations - Failure to Notify (ST6).
- April 5, 2021: WW SSO - Discharge to Waters (ST6).
- April 5, 2021: Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment (ST6).
- March 28, 2020: WW SSO - Discharge to Waters (ST6).
- March 28, 2020: Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment (ST6).
- January 11, 2020: WW SSO - Discharge to Waters (ST6).
- January 11, 2020: Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment (ST6).
- July 20, 2019: WW SSO - Discharge to Waters (ST6).
- July 20, 2019: Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment (ST6).
- March 4, 2019: Effluent Violations - Numeric effluent violation (ST6).
- May 21, 2018: Reporting Violations - Late Submittal of DMRs (ST6).
- January 20, 2018: WW SSO - Discharge to Waters (ST6).
- January 20, 2018: Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment (ST6).
- November 27, 2017: Permit Violations - Discharge Without a Valid Permit (ST6).
- May 5, 2017: Reporting Violations - Failure to Notify (ST6).
- March 31, 2017: Reporting Violations - Failure to Notify (ST6).
- March 31, 2017: WW SSO - Discharge to Waters (ST6).
- March 31, 2017: Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment (ST6).
Michigan holds 200 Publicly owned treatment works coverages of this permit type in EPA’s file; 109 were issued before MI0043800.
Coverages issued nearest MI0043800
- 2018-09-28: LOCH ALPINE SA-SCIO-WEB WWTP, Ann Arbor: MI0024066, held by Loch Alpine Sanitary Authority
- 2018-10-15: MASON WWTP, Mason: MI0020435, held by City of Mason
- 2018-10-23: DIMONDALE/WINDSOR WWTP, Dimondale: MI0053562, held by Village of Dimondale
- 2018-10-23: GLADSTONE WWTP, Gladstone: MI0057676, held by City of Gladstone
- 2018-11-02: LEONI TWP WWTP, Jackson: MI0045942, held by Leoni Township
- 2018-11-27: GRANT WWTP, Grant: MI0023035, held by City of Grant
- 2018-11-29: WILLIAMSTON WWTP, Williamston: MI0021717, held by City of Williamston
- 2018-11-29: ROLLIN-WOODSTOCK WWTP, Addison: MI0027669, held by Lenawee County Drain Commission, as Agent for Rollin-Woodstock Sanitary Drain Dr
- 2018-11-30: FOWLERVILLE WWTP, Fowlerville: MI0020664, held by Village of Fowlerville
- 2018-12-17: HANDY TWP WWTP, Fowlerville: MI0056839, held by Handy Township
SOUTH HURON VALLEY UTILITY AUTHORITY WWTP among its neighbors
Its county: 179, 8 major; MI0043800 is major permit.
Other permits in the county
- ABC CHEMICAL CORP., Detroit: MIP000126
- ADIENT ROMULUS, Romulus: MIS310801, minor, term to 2028-04-01
- AJAX MATERIALS-PLT 5, Romulus: MIS210300, minor, term to 2027-03-31
- ALLIED-SIGNAL, INC., Detroit: MIP000047
- AMAZON.COM SERVICES LLC - DTW8, Plymouth: MIS211198, minor, term to 2022-04-01
- AMAZON.COM SERVICES LLC-DTW3, Romulus: MIS310775, minor, term to 2023-04-01
- AMAZON.COM SERVICES LLC-DTW9, Romulus: MIS310776, minor, term to 2023-04-01
- AMAZON.COM SERVICES, LLC - DDT2, Romulus: MIS211170, minor, term to 2022-04-01
- ANCOTECH, INC., Dearborn: MIP000101
- APPLIED TECHNOLGIES, INC, Romulus: MIP000112
Identity
| Facility | SOUTH HURON VALLEY UTILITY AUTHORITY WWTP |
|---|---|
| Permittee | South Huron Valley Utility Authority |
| NPDES ID | MI0043800 |
| Status | Administratively continued |
| Type | Individual permit |
| Class | Major |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | November 7, 2018 |
| Expires | October 1, 2022 |
| Agency | State |
| Address | Rockwood, MI 48173 |
| Receiving water | Detroit River |
| Receiving water impaired | 303(D) Listed |
| Program components on file | Biosolids, POTW, Pretreatment |
| NAICS | 221320 – Sewage Treatment Facilities |
| SIC | 4952 – Sewerage Systems |
NPDES MI0043800: effluent limits and exceedances
SOUTH HURON VALLEY UTILITY AUTHORITY WWTP (NPDES MI0043800): 30 pollutants on file, 28 limited; 15 with a violation of any kind, 8 with an exceedance.
| Pollutant | Limits | Violations | Exceedances | Latest | Largest, as filed |
|---|---|---|---|---|---|
| Solids, total suspended | 4 | 30 | 14 | November 30, 2024 | 320% over the limit |
| Mercury, total [as Hg] | 6 | 24 | 14 | December 31, 2017 | 7,567% over the limit |
| Phosphorus, total [as P] | 4 | 16 | 10 | December 31, 2018 | 70% over the limit |
| Solids, suspended percent removal | 2 | 8 | 4 | April 30, 2009 | 220% over the limit |
| pH | 2 | 11 | 3 | July 31, 2026 | |
| TU Static 24 Hr Acute Pimephales promelas | 1 | 3 | 3 | February 28, 2021 | 50% over the limit |
| Coliform, fecal general | 2 | 10 | 2 | July 31, 2026 | 205% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 4 | 17 | 1 | April 30, 2009 | 10% over the limit |
| Flow, in conduit or thru treatment plant | 2 | 8 | 0 | ||
| Copper, total [as Cu] | 0 | 7 | 0 | ||
| Nitrogen, ammonia total [as N] | 4 | 4 | 0 | ||
| BOD, carb-5 day, 20 deg C, percent removal | 2 | 4 | 0 | ||
| Oxygen, dissolved [DO] | 1 | 4 | 0 | ||
| Chlorine, total residual | 1 | 4 | 0 | ||
| Zinc, total [as Zn] | 0 | 4 | 0 | ||
| Solids, total | 3 | 0 | 0 | ||
| Arsenic, dry weight | 3 | 0 | 0 | ||
| Selenium, dry weight | 3 | 0 | 0 | ||
| Copper, dry weight | 3 | 0 | 0 | ||
| Cadmium, dry weight | 3 | 0 | 0 | ||
| Nitrogen, total Kjeldahl | 3 | 0 | 0 | ||
| Molybdenum, sludge, total, dry weight [as Mo] | 3 | 0 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 3 | 0 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 3 | 0 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 3 | 0 | 0 | ||
| Nitrogen, sludge, total, dry weight [as N] | 3 | 0 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 3 | 0 | 0 | ||
| Potassium, sludge, total, dry weight [as K] | 3 | 0 | 0 | ||
| Phosphorus, sludge, total, dry weight [as P] | 3 | 0 | 0 | ||
| Cyanide [A] | 2 | 0 | 0 |
NPDES MI0043800: inspections, violations and enforcement
NPDES MI0043800: 22 single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| June 23, 2025 | Monitoring Violations - Improper Analysis or Lab Error | ST6 |
| June 23, 2025 | Monitoring Violations - Invalid/Unrepresentative Sample | ST6 |
| January 1, 2024 | Failure to enforce standards, local limits, and reporting requirements (>15% SNC SIU) (Level II) | ST6 |
| November 21, 2022 | Reporting Violations - Late Submittal of DMRs | ST6 |
| July 22, 2022 | Reporting Violations - Failure to Notify | ST6 |
| April 5, 2021 | WW SSO - Discharge to Waters | ST6 |
| April 5, 2021 | Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment | ST6 |
| March 28, 2020 | WW SSO - Discharge to Waters | ST6 |
| March 28, 2020 | Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment | ST6 |
| January 11, 2020 | WW SSO - Discharge to Waters | ST6 |
| January 11, 2020 | Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment | ST6 |
| July 20, 2019 | WW SSO - Discharge to Waters | ST6 |
| July 20, 2019 | Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment | ST6 |
| March 4, 2019 | Effluent Violations - Numeric effluent violation | ST6 |
| May 21, 2018 | Reporting Violations - Late Submittal of DMRs | ST6 |
| January 20, 2018 | WW SSO - Discharge to Waters | ST6 |
| January 20, 2018 | Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment | ST6 |
| November 27, 2017 | Permit Violations - Discharge Without a Valid Permit | ST6 |
| May 5, 2017 | Reporting Violations - Failure to Notify | ST6 |
| March 31, 2017 | Reporting Violations - Failure to Notify | ST6 |
| March 31, 2017 | WW SSO - Discharge to Waters | ST6 |
| March 31, 2017 | Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment | ST6 |
NPDES MI0043800: 2 inspections
| Date | What EPA recorded | Agency |
|---|---|---|
| October 6, 2026 | Evaluation | S |
| March 3, 2026 | Sampling | S |
NPDES MI0043800: 2 informal enforcement actions
| Date | What EPA recorded | Agency |
|---|---|---|
| September 2, 2026 | Notice of Violation | State |
| April 3, 2026 | Letter of Violation/ Warning Letter | State |
NPDES MI0043800 (SOUTH HURON VALLEY UTILITY AUTHORITY WWTP): no formal enforcement action on file.
Watch NPDES MI0043800
NPDES MI0043800: one email when its EPA record changes — $99/month.
Permits near NPDES MI0043800
NPDES MI0043800: 30 pollutant rows, 26 dated events; ICIS-NPDES download, loaded October 14, 2026.