Clean Water Act discharge permit · NPDES MI0022136
HILLSDALE WWTP, Hillsdale, MI: NPDES MI0022136 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 31Pollutants under a numeric limit
- 14Pollutants with an effluent exceedance
HILLSDALE WWTP, held by Hillsdale Board of Public Utilities, holds NPDES permit MI0022136, which discharges to St. Joseph River. EPA’s file records it issued July 14, 2017 and expiring October 1, 2021. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | HILLSDALE WWTP |
|---|---|
| Permittee as filed | Hillsdale Board of Public Utilities |
| NPDES ID | MI0022136 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Not a publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | July 14, 2017 |
| Expiration date | October 1, 2021 |
| Issuing agency | State |
| Address | Hillsdale, MI 49242 |
| Receiving water | St. Joseph River |
| Subwatershed | Mill Pond-Saint Joseph River (HUC 040500010203) |
| Program components on file | Biosolids, POTW |
| NAICS | 221320 – Sewage Treatment Facilities |
| SIC | 4952 – Sewerage Systems |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.
Effluent limits and exceedances
- 36Pollutants on file
- 31Under a numeric limit
- 34With a violation of any kind
- 14With 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 |
|---|---|---|---|---|---|
| Mercury, total [as Hg] | 6 | 83 | 53 | October 31, 2016 | 873,553% over the limit |
| Nitrogen, ammonia total [as N] | 12 | 145 | 13 | May 31, 2025 | 627% over the limit |
| Oxygen, dissolved [DO] | 2 | 24 | 7 | December 31, 2016 | 20% over the limit |
| Phosphorus, total [as P] | 4 | 69 | 3 | January 31, 2017 | 90% over the limit |
| Coliform, fecal general | 2 | 41 | 3 | February 28, 2026 | 165% over the limit |
| Chlorine, total residual | 1 | 20 | 3 | January 31, 2017 | 1,061% over the limit |
| Cyanide [A] | 4 | 3 | 3 | August 31, 2015 | 100% over the limit |
| Toxicity, choice of species | 1 | 3 | 3 | February 28, 2019 | 409% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 12 | 134 | 2 | September 30, 2011 | 350% over the limit |
| Solids, total suspended | 8 | 130 | 2 | February 28, 2017 | 40% over the limit |
| Solids, suspended percent removal | 2 | 9 | 2 | March 31, 2023 | 313% over the limit |
| Selenium, total [as Se] | 4 | 2 | 2 | May 31, 2017 | 11% over the limit |
| Static 48 Hr Chronic Pimphales Promelas | 1 | 2 | 2 | April 30, 2018 | 155% over the limit |
| pH | 2 | 35 | 1 | February 28, 2013 | |
| Copper, total [as Cu] | 0 | 45 | 0 | ||
| Cadmium, total [as Cd] | 0 | 42 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 36 | 0 | ||
| Beryllium, total [as Be] | 0 | 22 | 0 | ||
| Selenium, dry weight | 3 | 6 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 3 | 6 | 0 | ||
| Arsenic, dry weight | 3 | 5 | 0 | ||
| Copper, dry weight | 3 | 5 | 0 | ||
| Cadmium, dry weight | 3 | 5 | 0 | ||
| Nitrogen, total Kjeldahl | 3 | 5 | 0 | ||
| Molybdenum, sludge, total, dry weight [as Mo] | 3 | 5 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 3 | 5 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 3 | 5 | 0 | ||
| Nitrogen, sludge, total, dry weight [as N] | 3 | 5 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 3 | 5 | 0 | ||
| Potassium, sludge, total, dry weight [as K] | 3 | 5 | 0 | ||
| Phosphorus, sludge, total, dry weight [as P] | 3 | 5 | 0 | ||
| Solids, total | 3 | 3 | 0 | ||
| Chloride [as Cl] | 0 | 2 | 0 | ||
| Sulfate, total [as SO4] | 0 | 2 | 0 | ||
| Toxicity [acute], Ceriodaphnia dubia | 1 | 0 | 0 | ||
| TU Static 24 Hr Acute Pimephales promelas | 1 | 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
- 12Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| August 20, 2024 | Failure to enforce standards, local limits, and reporting requirements (>15% SNC SIU) (Level II) | ST6 |
| February 8, 2024 | Monitoring Violations - Invalid/Unrepresentative Sample | ST6 |
| February 8, 2024 | Monitoring Violations - Analysis not Conducted | ST6 |
| January 21, 2024 | Reporting Violations - Late Submittal of DMRs | ST6 |
| September 15, 2022 | Pretreatment - Failure to Develop/Enforce Standards | ST6 |
| September 15, 2022 | Failure to enforce standards, local limits, and reporting requirements (>15% SNC SIU) (Level II) | ST6 |
| August 21, 2022 | Reporting Violations - Late Submittal of DMRs | ST6 |
| May 21, 2022 | Reporting Violations - Late Submittal of DMRs | ST6 |
| January 3, 2020 | Monitoring Violations - Improper Analysis or Lab Error | ST6 |
| February 6, 2018 | Pretreatment - Failure to Develop/Enforce Standards | ST6 |
| February 6, 2018 | Failure to enforce standards, local limits, and reporting requirements (>15% SNC SIU) (Level II) | ST6 |
| May 21, 2017 | Permit Violations - Discharge Without a Valid Permit | ST6 |
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.