Clean Water Act discharge permit · NPDES MT0031437
SWEET GRASS WWTF, Sweet Grass, MT: NPDES MT0031437 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 14Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
SWEET GRASS WWTF, held by SWEETGRASS COMM CO WATER SEWER DIST, holds NPDES permit MT0031437, which discharges to Unnamed Dry Lake. EPA’s file records it issued October 15, 2010 and expiring October 31, 2015. 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 | SWEET GRASS WWTF |
|---|---|
| Permittee as filed | SWEETGRASS COMM CO WATER SEWER DIST |
| NPDES ID | MT0031437 |
| 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 | October 15, 2010 |
| Expiration date | October 31, 2015 |
| Issuing agency | MONTANA DEQ |
| Address | Sweet Grass, MT 59484 |
| Receiving water | UNNAMED DRY LAKE |
| Subwatershed | Sweetgrass (HUC 100500020200) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 18Pollutants on file
- 14Under a numeric limit
- 18With a violation of any kind
- 0With 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 |
|---|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | 5 | 38 | 0 | ||
| Solids, total suspended | 5 | 38 | 0 | ||
| Nitrogen, total [as N] | 2 | 20 | 0 | ||
| Phosphorus, total [as P] | 2 | 20 | 0 | ||
| Temperature, water deg. centigrade | 2 | 18 | 0 | ||
| pH | 2 | 14 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 1 | 10 | 0 | ||
| Nitrite + Nitrate total [as N] | 1 | 10 | 0 | ||
| Flow rate | 0 | 8 | 0 | ||
| Oil & Grease | 0 | 8 | 0 | ||
| Coliform, fecal general | 0 | 8 | 0 | ||
| Nitrogen, ammonia total [as N] | 1 | 7 | 0 | ||
| E. coli, MTEC-MF | 4 | 6 | 0 | ||
| Flow rate | 2 | 6 | 0 | ||
| Duration of discharge | 0 | 4 | 0 | ||
| Duration | 1 | 3 | 0 | ||
| BOD, 5-day, percent removal | 1 | 3 | 0 | ||
| Solids, suspended percent removal | 1 | 3 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES MT0031437.
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 MT0031437.
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.
Watch this permit
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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 MT0031437 there.
Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.