Clean Water Act discharge permit · NPDES MT0022586
CITY OF BILLINGS WWTP, Billings, MT: NPDES MT0022586 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 37Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
CITY OF BILLINGS WWTP, held by CITY OF BILLINGS, holds NPDES permit MT0022586, which discharges to Yellowstone River. EPA’s file records it issued September 28, 2006 and expiring October 31, 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 | CITY OF BILLINGS WWTP |
|---|---|
| Permittee as filed | CITY OF BILLINGS |
| NPDES ID | MT0022586 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | September 28, 2006 |
| Expiration date | October 31, 2011 |
| Issuing agency | MONTANA DEQ |
| Address | Billings, MT 59101 |
| Receiving water | YELLOWSTONE RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Yellowstone River-Billings (HUC 100700041006) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 38Pollutants on file
- 37Under a numeric limit
- 21With a violation of any kind
- 7With 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 | 6 | 23 | 17 | July 31, 2020 | 344% over the limit |
| Nitrogen, ammonia total [as N] | 2 | 9 | 7 | November 30, 2020 | 153% over the limit |
| Solids, suspended percent removal | 1 | 6 | 5 | February 29, 2020 | 353% over the limit |
| Coliform, fecal general | 0 | 4 | 4 | September 30, 2003 | 99,999% over the limit |
| E. coli, MTEC-MF | 8 | 5 | 3 | July 31, 2020 | 99,999% over the limit |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | 2 | 2 | 2 | June 30, 2014 | |
| BOD, carbonaceous, percent removal | 1 | 2 | 1 | January 31, 2020 | 20% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 6 | 6 | 0 | ||
| Nitrogen, total [as N] | 4 | 4 | 0 | ||
| Phosphorus, total [as P] | 4 | 4 | 0 | ||
| Oxygen, dissolved [DO] | 3 | 3 | 0 | ||
| Flow, in conduit or thru treatment plant | 3 | 3 | 0 | ||
| Temperature, water deg. centigrade | 2 | 2 | 0 | ||
| pH | 2 | 2 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 2 | 2 | 0 | ||
| Nitrite + Nitrate total [as N] | 2 | 2 | 0 | ||
| Chlorine, total residual | 2 | 1 | 0 | ||
| Oil & Grease | 1 | 1 | 0 | ||
| Petrol hydrocarbons, total recoverable | 1 | 1 | 0 | ||
| Solids, total dissolved [TDS] | 1 | 1 | 0 | ||
| Oil and grease visual | 1 | 1 | 0 | ||
| Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubia | 2 | 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 | ||
| Zinc, total recoverable | 1 | 0 | 0 | ||
| Cadmium, total recoverable | 1 | 0 | 0 | ||
| Lead, total recoverable | 1 | 0 | 0 | ||
| Chromium, total recoverable | 1 | 0 | 0 | ||
| Copper, 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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES MT0022586.
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 MT0022586 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.