Clean Water Act discharge permit · NPDES MT0030759
HARDIN WASTEWATER TREATMENT PLANT, Hardin, MT: NPDES MT0030759 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 36Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
HARDIN WASTEWATER TREATMENT PLANT, held by HARDIN, CITY OF, holds NPDES permit MT0030759, which discharges to Big Horn River. EPA’s file records it issued March 14, 2018 and expiring June 30, 2023. 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 | HARDIN WASTEWATER TREATMENT PLANT |
|---|---|
| Permittee as filed | HARDIN, CITY OF |
| NPDES ID | MT0030759 |
| 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 | March 14, 2018 |
| Expiration date | June 30, 2023 |
| Issuing agency | U.S. EPA Region 8 |
| Address | Hardin, MT 59034 |
| Receiving water | BIG HORN RIVER |
| Subwatershed | Bighorn River-Hardin (HUC 100800150704) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 82Pollutants on file
- 36Under a numeric limit
- 79With 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; the 60 with the most exceedances of 82 are shown.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| E. coli | 4 | 19 | 11 | October 31, 2025 | 654% over the limit |
| Coliform, fecal general | 0 | 15 | 8 | September 30, 2009 | 1,900% over the limit |
| BOD, 5-day, 20 deg. C | 4 | 31 | 4 | July 31, 2008 | 223% over the limit |
| Solids, total suspended | 4 | 34 | 3 | April 30, 2023 | 223% over the limit |
| BOD, 5-day, percent removal | 1 | 6 | 3 | April 30, 2023 | 93% over the limit |
| Solids, suspended percent removal | 1 | 6 | 3 | April 30, 2023 | 380% over the limit |
| Chlorine, total residual | 1 | 6 | 1 | June 30, 2009 | 9,500% over the limit |
| pH | 2 | 10 | 0 | ||
| Flow, in conduit or thru treatment plant | 0 | 10 | 0 | ||
| Oil & Grease | 1 | 5 | 0 | ||
| Oil and grease visual | 1 | 5 | 0 | ||
| Cyanide, total [as CN] | 1 | 3 | 0 | ||
| Arsenic, total [as As] | 1 | 3 | 0 | ||
| Cadmium, total [as Cd] | 1 | 3 | 0 | ||
| Chromium, total [as Cr] | 1 | 3 | 0 | ||
| Copper, total [as Cu] | 1 | 3 | 0 | ||
| Lead, total [as Pb] | 1 | 3 | 0 | ||
| Molybdenum, total [as Mo] | 1 | 3 | 0 | ||
| Nickel, total [as Ni] | 1 | 3 | 0 | ||
| Silver, total [as Ag] | 1 | 3 | 0 | ||
| Zinc, total [as Zn] | 1 | 3 | 0 | ||
| Selenium, total [as Se] | 1 | 3 | 0 | ||
| Volatile Organic Compound [VOC] | 1 | 3 | 0 | ||
| Floating solids, waste or visible foam-visual | 0 | 3 | 0 | ||
| Phenols | 0 | 3 | 0 | ||
| Mercury, total [as Hg] | 1 | 2 | 0 | ||
| Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubia | 0 | 2 | 0 | ||
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | 0 | 2 | 0 | ||
| Oxygen, dissolved [DO] | 1 | 1 | 0 | ||
| Nitrogen, total [as N] | 1 | 1 | 0 | ||
| Nitrogen, ammonia total [as N] | 1 | 1 | 0 | ||
| Nitrogen, nitrite total [as N] | 1 | 1 | 0 | ||
| Nitrogen, nitrate total [as N] | 1 | 1 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 1 | 1 | 0 | ||
| Phosphorus, total [as P] | 1 | 1 | 0 | ||
| Beryllium, total [as Be] | 1 | 1 | 0 | ||
| Antimony, total [as Sb] | 1 | 1 | 0 | ||
| Tetrachloroethylene | 1 | 1 | 0 | ||
| Base neutrals & acid [Method 625], efflnt | 1 | 1 | 0 | ||
| Perfluorooctanoic acid (PFOA) | 0 | 1 | 0 | ||
| Perfluorobutanoic acid (PFBA) | 0 | 1 | 0 | ||
| Perfluorooctanesulfonamide (PFOSA) | 0 | 1 | 0 | ||
| Perfluoropentanoic acid (PFPeA) | 0 | 1 | 0 | ||
| Perfluorohexanoic acid (PFHxA) | 0 | 1 | 0 | ||
| Perfluoroheptanoic acid (PFHpA) | 0 | 1 | 0 | ||
| Perfluorononanoic acid (PFNA) | 0 | 1 | 0 | ||
| Perfluorodecanoic acid (PFDA) | 0 | 1 | 0 | ||
| Perfluoroundecanoic acid (PFUnA) | 0 | 1 | 0 | ||
| Perfluorododecanoic acid (PFDoA) | 0 | 1 | 0 | ||
| Perfluorotridecanoic acid (PFTrDA) | 0 | 1 | 0 | ||
| Perfluorotetradecanoic acid (PFTeDA) | 0 | 1 | 0 | ||
| N-ethyl perfluorooctanesulfonamidoethanol (NEtFOSE) | 0 | 1 | 0 | ||
| N-methyl perfluorooctanesulfonamidoethanol (NMeFOSE) | 0 | 1 | 0 | ||
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | 0 | 1 | 0 | ||
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | 0 | 1 | 0 | ||
| Perfluorobutanesulfonic acid (PFBS) | 0 | 1 | 0 | ||
| Perfluorodecanesulfonic acid (PFDS) | 0 | 1 | 0 | ||
| Perfluoroheptanesulfonic acid (PFHpS) | 0 | 1 | 0 | ||
| Perfluorohexanesulfonic acid (PFHxS) | 0 | 1 | 0 | ||
| Perfluorooctanesulfonic acid (PFOS) | 0 | 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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES MT0030759.
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 15, 2026.