Clean Water Act discharge permit · NPDES MI0022217
ANN ARBOR WWTP, Ann Arbor, MI: NPDES MI0022217 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MajorDischarger class
- 30Pollutants under a numeric limit
- 4Pollutants with an effluent exceedance
- 2Inspections on file
- 0Formal enforcement actions
ANN ARBOR WWTP, held by City of Ann Arbor, holds NPDES permit MI0022217, which discharges to Huron River. EPA’s file records it issued September 27, 2018 and expiring October 1, 2022. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | ANN ARBOR WWTP |
|---|---|
| Permittee as filed | City of Ann Arbor |
| NPDES ID | MI0022217 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | September 27, 2018 |
| Expiration date | October 1, 2022 |
| Issuing agency | State |
| Address | Ann Arbor, MI 48105 |
| Receiving water | Huron River |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Swift Drain-Huron River (HUC 040900050402) |
| Other EPA IDs (FRS) | RCRA handler MID000772392 |
Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 32Pollutants on file
- 30Under a numeric limit
- 30With a violation of any kind
- 4With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Phosphorus, total [as P] | 21 | 62 | 11 | January 31, 2019 | 122% over the limit |
| Nitrogen, ammonia total [as N] | 13 | 41 | 11 | October 31, 2024 | 80% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 24 | 21 | 9 | July 31, 2024 | 99,999% over the limit |
| Coliform, fecal general | 2 | 8 | 2 | January 31, 2023 | 76% over the limit |
| Mercury, total [as Hg] | 12 | 200 | 0 | ||
| Cyanide [A] | 2 | 24 | 0 | ||
| Toxicity, choice of species | 4 | 23 | 0 | ||
| Static 48 Hr Chronic Pimphales Promelas | 4 | 23 | 0 | ||
| Toxicity [acute], Ceriodaphnia dubia | 2 | 13 | 0 | ||
| TU Static 24 Hr Acute Pimephales promelas | 2 | 13 | 0 | ||
| pH | 2 | 6 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 6 | 0 | ||
| Perfluorooctanoic acid (PFOA) | 0 | 4 | 0 | ||
| Perfluorooctanesulfonate | 0 | 4 | 0 | ||
| Solids, total | 3 | 3 | 0 | ||
| Arsenic, dry weight | 3 | 3 | 0 | ||
| Selenium, dry weight | 3 | 3 | 0 | ||
| Copper, dry weight | 3 | 3 | 0 | ||
| Cadmium, dry weight | 3 | 3 | 0 | ||
| Nitrogen, total Kjeldahl | 3 | 3 | 0 | ||
| Molybdenum, sludge, total, dry weight [as Mo] | 3 | 3 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 3 | 3 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 3 | 3 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 3 | 3 | 0 | ||
| Nitrogen, sludge, total, dry weight [as N] | 3 | 3 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 3 | 3 | 0 | ||
| Potassium, sludge, total, dry weight [as K] | 3 | 3 | 0 | ||
| Phosphorus, sludge, total, dry weight [as P] | 3 | 3 | 0 | ||
| Oxygen, dissolved [DO] | 1 | 3 | 0 | ||
| Selenium, total [as Se] | 2 | 2 | 0 | ||
| Solids, total suspended | 16 | 0 | 0 | ||
| Solids, suspended percent removal | 2 | 0 | 0 |
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 10Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| October 4, 2022 | WW SSO - Discharge to Waters | ST6 |
| October 4, 2022 | Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment | ST6 |
| May 19, 2020 | WW SSO - Discharge to Waters | ST6 |
| May 19, 2020 | Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment | ST6 |
| November 2, 2018 | Effluent Violations - Narrative Effluent Violation | ST6 |
| June 25, 2017 | Monitoring Violations - Improper Analysis or Lab Error | ST6 |
| May 9, 2017 | Monitoring Violations - Improper Analysis or Lab Error | ST6 |
| May 8, 2017 | Monitoring Violations - Improper Analysis or Lab Error | ST6 |
| May 7, 2017 | Monitoring Violations - Improper Analysis or Lab Error | ST6 |
| May 3, 2017 | Monitoring Violations - Improper Analysis or Lab Error | ST6 |
Inspections
| Date | What EPA recorded | Agency |
|---|---|---|
| October 20, 2026 | Evaluation | S |
| January 6, 2026 | Evaluation | S |
Formal enforcement and penalties
0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.
Informal enforcement
| Date | What EPA recorded | Agency |
|---|---|---|
| October 23, 2026 | Letter of Violation/ Warning Letter | State |
| February 2, 2026 | Letter of Violation/ Warning Letter | State |
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
Watch this permit
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How we handle your data → Privacy
EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID MI0022217 there.
ANN ARBOR WWTP, Ann Arbor, Michigan: Individual permit MI0022217, held by City of Ann Arbor; Publicly owned treatment works; Effective; issued September 27, 2018, term to October 1, 2022, by State; discharges to Huron River.
- Phosphorus, total [as P]: 21 limits, 62 violations of any kind, 11 effluent exceedances, latest January 31, 2019, largest 122% over the limit.
- Nitrogen, ammonia total [as N]: 13 limits, 41 violations of any kind, 11 effluent exceedances, latest October 31, 2024, largest 80% over the limit.
- BOD, carbonaceous [5 day, 20 C]: 24 limits, 21 violations of any kind, 9 effluent exceedances, latest July 31, 2024, largest 99,999% over the limit.
- Coliform, fecal general: 2 limits, 8 violations of any kind, 2 effluent exceedances, latest January 31, 2023, largest 76% over the limit.
- Mercury, total [as Hg]: 12 limits, 200 violations of any kind, 0 effluent exceedances.
- Cyanide [A]: 2 limits, 24 violations of any kind, 0 effluent exceedances.
- Toxicity, choice of species: 4 limits, 23 violations of any kind, 0 effluent exceedances.
- Static 48 Hr Chronic Pimphales Promelas: 4 limits, 23 violations of any kind, 0 effluent exceedances.
- Toxicity [acute], Ceriodaphnia dubia: 2 limits, 13 violations of any kind, 0 effluent exceedances.
- TU Static 24 Hr Acute Pimephales promelas: 2 limits, 13 violations of any kind, 0 effluent exceedances.
- pH: 2 limits, 6 violations of any kind, 0 effluent exceedances.
- Flow, in conduit or thru treatment plant: 2 limits, 6 violations of any kind, 0 effluent exceedances.
- Perfluorooctanoic acid (PFOA): 0 limits, 4 violations of any kind, 0 effluent exceedances.
- Perfluorooctanesulfonate: 0 limits, 4 violations of any kind, 0 effluent exceedances.
- Solids, total: 3 limits, 3 violations of any kind, 0 effluent exceedances.
- Arsenic, dry weight: 3 limits, 3 violations of any kind, 0 effluent exceedances.
- Selenium, dry weight: 3 limits, 3 violations of any kind, 0 effluent exceedances.
- Copper, dry weight: 3 limits, 3 violations of any kind, 0 effluent exceedances.
- Cadmium, dry weight: 3 limits, 3 violations of any kind, 0 effluent exceedances.
- Nitrogen, total Kjeldahl: 3 limits, 3 violations of any kind, 0 effluent exceedances.
- Molybdenum, sludge, total, dry weight [as Mo]: 3 limits, 3 violations of any kind, 0 effluent exceedances.
- Zinc, sludge, total, dry weight [as Zn]: 3 limits, 3 violations of any kind, 0 effluent exceedances.
- Lead, sludge, total, dry weight [as Pb]: 3 limits, 3 violations of any kind, 0 effluent exceedances.
- Nickel, sludge, total, dry weight [as Ni]: 3 limits, 3 violations of any kind, 0 effluent exceedances.
- Nitrogen, sludge, total, dry weight [as N]: 3 limits, 3 violations of any kind, 0 effluent exceedances.
- Mercury, sludge, total, dry weight [as Hg]: 3 limits, 3 violations of any kind, 0 effluent exceedances.
- Potassium, sludge, total, dry weight [as K]: 3 limits, 3 violations of any kind, 0 effluent exceedances.
- Phosphorus, sludge, total, dry weight [as P]: 3 limits, 3 violations of any kind, 0 effluent exceedances.
- Oxygen, dissolved [DO]: 1 limit, 3 violations of any kind, 0 effluent exceedances.
- Selenium, total [as Se]: 2 limits, 2 violations of any kind, 0 effluent exceedances.
- Solids, total suspended: 16 limits, 0 violations of any kind, 0 effluent exceedances.
- Solids, suspended percent removal: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- October 23, 2026: Letter of Violation/ Warning Letter (State).
- October 20, 2026: Evaluation (S).
- February 2, 2026: Letter of Violation/ Warning Letter (State).
- January 6, 2026: Evaluation (S).
- October 4, 2022: WW SSO - Discharge to Waters (ST6).
- October 4, 2022: Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment (ST6).
- May 19, 2020: WW SSO - Discharge to Waters (ST6).
- May 19, 2020: Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment (ST6).
- November 2, 2018: Effluent Violations - Narrative Effluent Violation (ST6).
- June 25, 2017: Monitoring Violations - Improper Analysis or Lab Error (ST6).
- May 9, 2017: Monitoring Violations - Improper Analysis or Lab Error (ST6).
- May 8, 2017: Monitoring Violations - Improper Analysis or Lab Error (ST6).
- May 7, 2017: Monitoring Violations - Improper Analysis or Lab Error (ST6).
- May 3, 2017: Monitoring Violations - Improper Analysis or Lab Error (ST6).
Michigan holds 200 Publicly owned treatment works coverages of this permit type in EPA’s file; 99 were issued before MI0022217. City of Ann Arbor holds 4 permits in Michigan.
Other permits held by City of Ann Arbor
- HIGH-LEVEL TRUNKLINE-ANN ARBOR, Ann Arbor: MIG081310, issued May 19, 2026
- ANN ARBOR WFP, Ann Arbor: MIG640207, issued May 24, 2017
- BICENTENNIAL PARK - ANN ARBOR, Ann Arbor: MIG760088, issued October 22, 2024
Coverages issued nearest MI0022217
- September 18, 2018: STANDISH WWTP, Standish, MI0024139, held by City of Standish
- September 24, 2018: OWOSSO/MID SHIAWASSEE CO WWTP, Owosso, MI0023752, held by City of Owosso
- September 26, 2018: REED CITY WWTP, Reed City, MI0020036, held by City of Reed City
- September 26, 2018: PAW PAW LAKE AREA WWTP, Coloma, MI0023779, held by Paw Paw Lake Area Joint Sewage Disposal Board
- September 26, 2018: ALLENDALE TWP WRRF, Allendale, MI0057679, held by Allendale Charter Township
- September 27, 2018: MARTIN RTB, Saint Clair Shores, MI0025453, held by Southeast Macomb Sanitary District
- September 27, 2018: CHAPATON RTB, Saint Clair Shores, MI0025585, held by 8 1/2 Mile Relief Drain Drainage District
- September 28, 2018: CHELSEA WWTP, Chelsea, MI0020737, held by City of Chelsea
- September 28, 2018: DEXTER WWTP, Dexter, MI0022829, held by Daniel Schlaff, City of Dexter
- September 28, 2018: LOCH ALPINE SA-SCIO-WEB WWTP, Ann Arbor, MI0024066, held by Loch Alpine Sanitary Authority
ANN ARBOR WWTP among its neighbors
EPA’s permit file holds 26 discharge permits in the Swift Drain-Huron River subwatershed (HUC 040900050402), MI0022217 among them. Its county holds 38, 5 of them major permits; MI0022217 is a major permit.
Other permits in the Swift Drain-Huron River subwatershed (HUC 040900050402)
- ANN ARBOR PS MS4-WASHTENAW, Ann Arbor: MI0060234, minor permit, permit term to October 1, 2028
- ANN ARBOR PS MS4-WASHTENAW, Ann Arbor: MIS040016, minor permit, permit term to April 1, 2008
- BICENTENNIAL PARK - ANN ARBOR, Ann Arbor: MIG760088, minor permit, discharging to Swift Drain, permit term to April 1, 2025
- BIG BLUE SWIM SCHOOL - ANN ARBOR, Ann Arbor: MIG760073, minor permit, discharging to Mallets Creek, permit term to April 1, 2025
- DURHAM SCHOOL SERVICES - ANN ARBOR, Ann Arbor: MIS410771, minor permit, discharging to Malletts Creek, permit term to April 1, 2024
- FEDERAL MOGUL CORP-SEALING SYS, Ann Arbor: MIG250421, minor permit, discharging to HURON RIVER VIA SEWER & PITTSFIELD, permit term to April 1, 2013
- FORESTBROOKE ATHLETIC CLUB, Ann Arbor: MIG760101, minor permit, discharging to Swift Run Drain, permit term to April 1, 2030
- HILTON GARDEN INN - ANN ARBOR, Ann Arbor: MIG760020, minor permit, discharging to Malletts Creek, permit term to April 1, 2025
- HOLIDAY INN EXPRESS & SUITES POOL - ANN ARBOR, Ann Arbor: MIG760054, minor permit, discharging to Mallets Creek, permit term to April 1, 2025
- HOME 2 SUITES ANN ARBOR, Ann Arbor: MIG760092, minor permit, discharging to Malletts Creek, permit term to April 1, 2030
Nearby on the register
- Discharge permits in Ann Arbor
- Every permit record in Ann Arbor, A to Z
- Discharge permits in Michigan
- Every permit record in Michigan, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.