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Miscellaneous Nonmetallic Minerals, Dillon, Montana. NPDES permit MT0029891 expired May 31, 2019; its limits still apply. Last 12 months: over a limit once (last January 2026), 11 of 38 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| January 2026 | Solids, total suspended, 30-day average | 29 mg/L | ≤ 25 mg/L | 16% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Flow rate | monthly average | report only (MGD) | all year | 001 |
| Flow rate | daily maximum | report only (MGD) | all year | 001 |
| Turbidity | value | report only (NTU) | Apr–Dec | 001 |
| Turbidity | value | report only (NTU) | Apr–Dec | 001 |
| Turbidity | value | report only (NTU) | Apr–Dec | 001 |
| pH | minimum | ≥ 7 SU | all year | 001 |
| pH | maximum | ≤ 8.5 SU | all year | 001 |
| Solids, total suspended | single grab sample | report only (mg/L) | all year | 001 |
| Oil and grease, hexane extr method | single grab sample | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Jul–Sep | 001 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | Jul–Sep | 001 |
| Nitrogen, total [as N] | monthly average | ≤ 38 lb/d | Jul–Sep | 001 |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | Jul–Sep | 001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | Jul–Sep | 001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | Jul–Sep | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | Jul–Sep | 001 |
| Fluoride, total [as F] | single grab sample | report only (mg/L) | all year | 001 |
| Iron, total [as Fe] | single grab sample | report only (mg/L) | all year | 001 |
| Selenium, total [as Se] | single grab sample | report only (mg/L) | all year | 001 |
| Oil and grease visual | value | report only (abst=0;prst=1) | all year | 001 |
| Flow rate | monthly average | report only (MGD) | all year | 002 |
| Flow rate | daily maximum | report only (MGD) | all year | 002 |
| pH | instantaneous minimum | ≥ 7 SU | all year | 002 |
| pH | instantaneous maximum | ≤ 8.5 SU | all year | 002 |
| Solids, total suspended | 30-day average | ≤ 25 mg/L | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 45 mg/L | all year | 002 |
| Oil and grease, hexane extr method | single grab sample | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Jul–Sep | 002 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | Jul–Sep | 002 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | Jul–Sep | 002 |
| Nitrogen, total [as N] | daily maximum | ≤ 18 lb/d | Jul–Sep | 002 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | Jul–Sep | 002 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrite + Nitrate total [as N] | daily maximum | ≤ 10 mg/L | all year | 002 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 002 |
| Fluoride, total [as F] | single grab sample | report only (mg/L) | all year | 002 |
| Iron, total [as Fe] | single grab sample | report only (mg/L) | all year | 002 |
| Selenium, total [as Se] | single grab sample | report only (mg/L) | all year | 002 |
| Oil and grease visual | value | report only (abst=0;prst=1) | all year | 002 |
| Temperature, water deg. centigrade | value | report only (deg C) | Apr–Dec | UPA |
| Flow rate | value | report only (MGD) | Apr–Dec | UPA |
| Turbidity | value | report only (NTU) | Apr–Dec | UPA |
| pH | value | report only (SU) | Apr–Dec | UPA |
| Solids, total suspended | single grab sample | report only (mg/L) | Apr–Dec | UPA |
| Fluoride, total [as F] | value | report only (mg/L) | Apr–Dec | UPA |
| Iron, total [as Fe] | value | report only (mg/L) | Apr–Dec | UPA |
| Selenium, total [as Se] | value | report only (mg/L) | Apr–Dec | UPA |
| Time, starting [hhmmusing 24-hour clock] | value | report only (time) | Apr–Dec | UPA |
| Temperature, water deg. centigrade | value | report only (deg C) | Apr–Dec | UPB |
| Flow rate | value | report only (MGD) | Apr–Dec | UPB |
| Turbidity | value | report only (NTU) | Apr–Dec | UPB |
| pH | value | report only (SU) | Apr–Dec | UPB |
| Solids, total suspended | single grab sample | report only (mg/L) | Apr–Dec | UPB |
| Fluoride, total [as F] | value | report only (mg/L) | Apr–Dec | UPB |
| Iron, total [as Fe] | value | report only (mg/L) | Apr–Dec | UPB |
| Selenium, total [as Se] | value | report only (mg/L) | Apr–Dec | UPB |
| Time, starting [hhmmusing 24-hour clock] | value | report only (time) | Apr–Dec | UPB |
| Temperature, water deg. centigrade | value | report only (deg C) | Apr–Dec | UPC |
| Flow rate | value | report only (MGD) | Apr–Dec | UPC |
| Turbidity | value | report only (NTU) | Apr–Dec | UPC |
| pH | value | report only (SU) | Apr–Dec | UPC |
| Solids, total suspended | single grab sample | report only (mg/L) | Apr–Dec | UPC |
| Fluoride, total [as F] | value | report only (mg/L) | Apr–Dec | UPC |
| Iron, total [as Fe] | value | report only (mg/L) | Apr–Dec | UPC |
| Selenium, total [as Se] | value | report only (mg/L) | Apr–Dec | UPC |
| Time, starting [hhmmusing 24-hour clock] | value | report only (time) | Apr–Dec | UPC |
Cited limits by parameter: Montana's rules and the federal ones.
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