Clean Water Act discharge permit · NPDES MI0021083
CROSWELL WWTP, Croswell, MI: NPDES MI0021083 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 26Pollutants under a numeric limit
- 9Pollutants with an effluent exceedance
CROSWELL WWTP, held by City of Croswell, holds NPDES permit MI0021083, which discharges to Black River. EPA’s file records it issued November 19, 2021 and expiring October 1, 2025. 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 | CROSWELL WWTP |
|---|---|
| Permittee as filed | City of Croswell |
| NPDES ID | MI0021083 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | November 19, 2021 |
| Expiration date | October 1, 2025 |
| Issuing agency | State |
| Address | Croswell, MI 48422 |
| Receiving water | Black River |
| Subwatershed | Mills Creek-Black River (HUC 040900010114) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 29Pollutants on file
- 26Under a numeric limit
- 29With a violation of any kind
- 9With 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 |
|---|---|---|---|---|---|
| Solids, total suspended | 4 | 291 | 127 | April 30, 2026 | 360% over the limit |
| Nitrogen, ammonia total [as N] | 10 | 237 | 123 | May 31, 2026 | 3,280% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 8 | 332 | 47 | April 30, 2026 | 313% over the limit |
| Phosphorus, total [as P] | 4 | 111 | 11 | September 30, 2024 | 100% over the limit |
| Coliform, fecal general | 2 | 88 | 9 | April 30, 2025 | 99,999% over the limit |
| Oxygen, dissolved [DO] | 2 | 83 | 8 | July 31, 2024 | 99% over the limit |
| Mercury, total [as Hg] | 6 | 283 | 3 | March 31, 2006 | 99,999% over the limit |
| pH | 2 | 81 | 1 | June 30, 2012 | |
| Molybdenum, sludge, total, dry weight [as Mo] | 3 | 7 | 1 | September 30, 2018 | 13% over the limit |
| Flow, in conduit or thru treatment plant | 2 | 102 | 0 | ||
| Chlorine, total residual | 1 | 46 | 0 | ||
| BOD, 5-day, 20 deg. C | 0 | 44 | 0 | ||
| Toxicity [acute], Ceriodaphnia dubia | 0 | 11 | 0 | ||
| Toxicity [chronic], Ceriodaphnia dubia | 0 | 11 | 0 | ||
| Solids, total | 3 | 6 | 0 | ||
| Arsenic, dry weight | 3 | 6 | 0 | ||
| Selenium, dry weight | 3 | 6 | 0 | ||
| Copper, dry weight | 3 | 6 | 0 | ||
| Cadmium, dry weight | 3 | 6 | 0 | ||
| Nitrogen, total Kjeldahl | 3 | 6 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 3 | 6 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 3 | 6 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 3 | 6 | 0 | ||
| Nitrogen, sludge, total, dry weight [as N] | 3 | 6 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 3 | 6 | 0 | ||
| Potassium, sludge, total, dry weight [as K] | 3 | 6 | 0 | ||
| Phosphorus, sludge, total, dry weight [as P] | 3 | 6 | 0 | ||
| Chloride [as Cl] | 2 | 2 | 0 | ||
| Sulfate, total [as SO4] | 2 | 2 | 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 |
|---|---|---|
| August 15, 2022 | Monitoring Violations - Failure to Monitor for Non-Toxicity Requirements | ST6 |
| December 13, 2021 | WW SSO - Failure to report violation that may endanger public health 122.41(l)(7) | ST6 |
| December 13, 2021 | PR: Failure to submit noncompliance report - CSO, SSO, or Bypass [40 CFR 122.41(l)(6) & (m)(3)(ii)] | ST6 |
| October 31, 2020 | Reporting Violations - Late Submittal of DMRs | ST6 |
| October 8, 2020 | Pretreatment - Failure to Enforce Against I/U | ST6 |
| October 8, 2020 | Failure to enforce standards, local limits, and reporting requirements (>15% SNC SIU) (Level II) | ST6 |
| August 19, 2018 | Permit Violations - Discharge Without a Valid Permit | ST6 |
| November 1, 2017 | Effluent Violations - Numeric effluent violation | ST6 |
| June 7, 2017 | Permit Violations - Discharge Without a Valid Permit | ST6 |
| April 7, 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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Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.