Clean Water Act discharge permit · NPDES MT0027430
ROCKER WWTP, Rocker, MT: NPDES MT0027430 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 33Pollutants under a numeric limit
- 10Pollutants with an effluent exceedance
ROCKER WWTP, held by COUNTY SEWER AND WATER DIST OF ROCKER, holds NPDES permit MT0027430, which discharges to Silver Bow Creek. EPA’s file records it issued August 31, 2006 and expiring September 30, 2011. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | ROCKER WWTP |
|---|---|
| Permittee as filed | COUNTY SEWER AND WATER DIST OF ROCKER |
| NPDES ID | MT0027430 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | August 31, 2006 |
| Expiration date | September 30, 2011 |
| Issuing agency | MONTANA DEQ |
| Address | Rocker, MT 59701 |
| Receiving water | SILVER BOW CREEK |
| Subwatershed | Silver Bow Creek-Butte (HUC 170102010204) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 34Pollutants on file
- 33Under a numeric limit
- 12With a violation of any kind
- 10With 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 |
|---|---|---|---|---|---|
| Copper, total recoverable | 1 | 78 | 78 | February 28, 2023 | 345% over the limit |
| Solids, total suspended | 13 | 37 | 37 | July 31, 2020 | 90% over the limit |
| Zinc, total recoverable | 1 | 35 | 35 | February 28, 2023 | 165% over the limit |
| pH | 4 | 23 | 23 | April 30, 2023 | |
| E. coli, MTEC-MF | 14 | 19 | 19 | October 31, 2020 | 3,749% over the limit |
| Chlorine, total residual | 4 | 17 | 13 | September 30, 2008 | 42% over the limit |
| Solids, suspended percent removal | 2 | 11 | 11 | July 31, 2020 | 101% over the limit |
| BOD, 5-day, 20 deg. C | 9 | 8 | 8 | May 31, 2020 | 116% over the limit |
| Nitrogen, total [as N] | 2 | 1 | 1 | June 30, 2020 | 22% over the limit |
| Coliform, fecal general | 0 | 1 | 1 | October 31, 1996 | 38% over the limit |
| Oxygen, dissolved [DO] | 1 | 27 | 0 | ||
| Flow rate | 3 | 1 | 0 | ||
| Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubia | 3 | 0 | 0 | ||
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | 3 | 0 | 0 | ||
| Temperature, water deg. centigrade | 2 | 0 | 0 | ||
| Phosphorus, total [as P] | 2 | 0 | 0 | ||
| BOD, 5-day, percent removal | 2 | 0 | 0 | ||
| Nitrogen, ammonia total [as N] | 1 | 0 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 1 | 0 | 0 | ||
| Nitrite + Nitrate total [as N] | 1 | 0 | 0 | ||
| Cyanide, total [as CN] | 1 | 0 | 0 | ||
| Hardness, total [as CaCO3] | 1 | 0 | 0 | ||
| Arsenic, total recoverable | 1 | 0 | 0 | ||
| Selenium, total recoverable | 1 | 0 | 0 | ||
| Thallium, total recoverable | 1 | 0 | 0 | ||
| Beryllium, total recoverable [as Be] | 1 | 0 | 0 | ||
| Nickel, total recoverable | 1 | 0 | 0 | ||
| Silver total recoverable | 1 | 0 | 0 | ||
| Cadmium, total recoverable | 1 | 0 | 0 | ||
| Lead, total recoverable | 1 | 0 | 0 | ||
| Chromium, total recoverable | 1 | 0 | 0 | ||
| Antimony, total recoverable | 1 | 0 | 0 | ||
| Total phenols | 1 | 0 | 0 | ||
| Mercury, total recoverable | 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
- 5Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| August 18, 2020 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
| August 18, 2020 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| August 18, 2020 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
| August 18, 2020 | Monitoring Violations - Invalid/Unrepresentative Sample | ST6 |
| August 18, 2020 | Effluent Violations - Unapproved Bypass | 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 September 14, 2026.