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Sewage treatment plant, Gardiner, Montana. NPDES permit MT0022705, in force until Sep 30, 2027. Last 12 months: over a limit 2 times (last April 2026), 6 required values missing, 17 of 50 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| April 2026 | Solids, total suspended, monthly average | 82 mg/L | ≤ 45 mg/L | 82% |
| April 2026 | Solids, total suspended, maximum weekly average | 82 mg/L | ≤ 65 mg/L | 26% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year | 001 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 001 |
| Flow rate | monthly average | report only (MGD) | all year | 001 |
| Flow rate | daily maximum | report only (MGD) | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 45 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (lb/d) | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | report only (lb/d) | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 001 |
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 65 mg/L | all year | 001 |
| Solids, total suspended | monthly average | report only (lb/d) | all year | 001 |
| Solids, total suspended | maximum weekly average | report only (lb/d) | all year | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 001 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 001 |
| Arsenic, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Cadmium, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Copper, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| E. coli, MTEC-MF | monthly geometric mean | ≤ 630 #/100mL | Jan, Feb, Mar, Nov, Dec | 001 |
| E. coli, MTEC-MF | monthly geometric mean | ≤ 126 #/100mL | Apr–Oct | 001 |
| E. coli, MTEC-MF | maximum weekly average | ≤ 1260 #/100mL | Jan, Feb, Mar, Nov, Dec | 001 |
| E. coli, MTEC-MF | maximum weekly average | ≤ 252 #/100mL | Apr–Oct | 001 |
| BOD, 5-day, percent removal | minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | minimum | ≥ 65 % | all year | 001 |
| Oil and grease visual | value | report only (N=0;Y=1) | all year | 001 |
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year | 002 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 002 |
| Flow rate | monthly average | report only (MGD) | all year | 002 |
| Flow rate | daily maximum | report only (MGD) | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 002 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 45 mg/L | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | report only (lb/d) | all year | 002 |
| BOD, 5-day, 20 deg. C | maximum weekly average | report only (lb/d) | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 002 |
| pH | daily minimum | ≥ 6 SU | all year | 002 |
| pH | daily maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | monthly average | ≤ 45 mg/L | all year | 002 |
| Solids, total suspended | maximum weekly average | ≤ 65 mg/L | all year | 002 |
| Solids, total suspended | monthly average | report only (lb/d) | all year | 002 |
| Solids, total suspended | maximum weekly average | report only (lb/d) | all year | 002 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 002 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | all year | 002 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year | 002 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 002 |
| Arsenic, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Cadmium, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Copper, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| E. coli, MTEC-MF | monthly geometric mean | ≤ 630 #/100mL | Jan, Feb, Mar, Nov, Dec | 002 |
| E. coli, MTEC-MF | monthly geometric mean | ≤ 126 #/100mL | Apr–Oct | 002 |
| E. coli, MTEC-MF | maximum weekly average | ≤ 1260 #/100mL | Jan, Feb, Mar, Nov, Dec | 002 |
| E. coli, MTEC-MF | maximum weekly average | ≤ 252 #/100mL | Apr–Oct | 002 |
| BOD, 5-day, percent removal | minimum | ≥ 85 % | all year | 002 |
| Solids, suspended percent removal | minimum | ≥ 65 % | all year | 002 |
| Oil and grease visual | value | report only (N=0;Y=1) | all year | 002 |
| Temperature, water deg. centigrade | minimum | report only (deg C) | all year | RIV |
| Temperature, water deg. centigrade | maximum | report only (deg C) | all year | RIV |
| pH | minimum | report only (SU) | all year | RIV |
| pH | maximum | report only (SU) | all year | RIV |
| Nitrogen, total [as N] | single sample | report only (mg/L) | Jul–Sep | RIV |
| Nitrogen, ammonia total [as N] | single sample | report only (mg/L) | all year | RIV |
| Nitrogen, Kjeldahl, total [as N] | single sample | report only (mg/L) | Jul–Sep | RIV |
| Nitrite + Nitrate total [as N] | single sample | report only (mg/L) | Jul–Sep | RIV |
| Phosphorus, total [as P] | single sample | report only (mg/L) | Jul–Sep | RIV |
| Hardness, total [as CaCO3] | single sample | report only (mg/L) | all year | RIV |
| Arsenic, total recoverable | single sample | report only (ug/L) | all year | RIV |
| Cadmium, total recoverable | single sample | report only (ug/L) | all year | RIV |
| Copper, total recoverable | single sample | report only (ug/L) | all year | RIV |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 117 lb/d | all year | SUM |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 176 lb/d | all year | SUM |
| Solids, total suspended | monthly average | ≤ 176 lb/d | all year | SUM |
| Solids, total suspended | maximum weekly average | ≤ 254 lb/d | all year | SUM |
Cited limits by parameter: Montana's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/MT0022705 · MCP: https://passage-data.com/mcp