Clean Water Act discharge permit · NPDES MT0021474
RONAN- CITY OF WWTF, Ronan, MT: NPDES MT0021474 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 16Pollutants under a numeric limit
- 6Pollutants with an effluent exceedance
RONAN- CITY OF WWTF, held by RONAN- CITY OF, holds NPDES permit MT0021474, which discharges to Crow Creek. EPA’s file records it issued June 6, 2013 and expiring June 30, 2018. 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 | RONAN- CITY OF WWTF |
|---|---|
| Permittee as filed | RONAN- CITY OF |
| NPDES ID | MT0021474 |
| 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 | June 6, 2013 |
| Expiration date | June 30, 2018 |
| Issuing agency | U.S. EPA Region 8 |
| Address | Ronan, MT 59864 |
| Receiving water | CROW CREEK |
| Subwatershed | Upper Crow Creek (HUC 170102120601) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 26Pollutants on file
- 16Under a numeric limit
- 26With a violation of any kind
- 6With 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 |
|---|---|---|---|---|---|
| Nitrogen, ammonia total [as N] | 4 | 375 | 218 | June 30, 2026 | 6,116% over the limit |
| Coliform, fecal general | 0 | 293 | 39 | December 31, 2023 | 99,999% over the limit |
| E. coli | 2 | 54 | 8 | January 31, 2024 | 99,999% over the limit |
| E. coli, MTEC-MF | 0 | 19 | 5 | October 31, 2008 | 287% over the limit |
| Solids, total suspended | 4 | 353 | 2 | October 31, 2013 | 227% over the limit |
| BOD, 5-day, 20 deg. C | 4 | 386 | 1 | January 31, 2010 | 33% over the limit |
| pH | 2 | 331 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 153 | 0 | ||
| Temperature, water deg. centigrade | 0 | 110 | 0 | ||
| Oil and grease visual | 1 | 107 | 0 | ||
| Oxygen, dissolved [DO] | 0 | 76 | 0 | ||
| Chlorine, total residual | 0 | 44 | 0 | ||
| BOD, 5-day, percent removal | 1 | 43 | 0 | ||
| Oil & Grease | 1 | 38 | 0 | ||
| Nitrogen, nitrate total [as N] | 0 | 36 | 0 | ||
| BOD, carbonaceous [5 day, 20 C] | 0 | 36 | 0 | ||
| Floating solids, waste or visible foam-visual | 1 | 30 | 0 | ||
| Solids, suspended percent removal | 1 | 25 | 0 | ||
| Nitrogen, Kjeldahl Total | 1 | 15 | 0 | ||
| Nitrogen, total [as N] | 1 | 14 | 0 | ||
| Phosphorus, total [as P] | 1 | 13 | 0 | ||
| Nitrite Plus Nitrate Total | 0 | 12 | 0 | ||
| Alkalinity, total [as CaCO3] | 0 | 10 | 0 | ||
| Solids, total dissolved [TDS] | 0 | 4 | 0 | ||
| Nitrogen, Nitrite Total | 1 | 1 | 0 | ||
| Nitrogen, Nitrate Total | 1 | 1 | 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
- 3Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| July 30, 2019 | Permit Violations - Discharge Without a Valid Permit | EP6 |
| October 29, 2018 | Permit Violations - Application Incomplete | EP6 |
| October 17, 2018 | Permit Violations - Failure to Submit Timely Permit Renewal Application | EP6 |
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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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 MT0021474 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.