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Fish Hatcheries And Preserves, Arlee, Montana. NPDES permit MT0030546, in force until Jun 30, 2028. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | 30-day average | report only (deg C) | all year | 001 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 001 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | all year | 001 |
| Oxygen, dissolved [DO] | 30-day average | report only (mg/L) | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 8.5 SU | all year | 001 |
| Solids, total suspended | 30-day average | report only (mg/L) | all year | 001 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 001 |
| Oil & Grease | daily maximum | ≤ 10 mg/L | all year | 001 |
| Nitrogen, total [as N] | 30-day average | report only (mg/L) | Jul–Sep | 001 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | Jul–Sep | 001 |
| Nitrogen, ammonia total [as N] | 30-day 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] | 30-day average | report only (mg/L) | Jul–Sep | 001 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | Jul–Sep | 001 |
| Nitrite + Nitrate total [as N] | 30-day average | report only (mg/L) | Jul–Sep | 001 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | Jul–Sep | 001 |
| Phosphorus, total [as P] | 30-day average | report only (mg/L) | Jul–Sep | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jul–Sep | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Oil and grease visual | instantaneous maximum | report only (abst=0;prst=1) | all year | 001 |
| Temperature, water deg. centigrade | 30-day average | report only (deg C) | all year | 001U |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 001U |
| pH | minimum | report only (SU) | all year | 001U |
| pH | maximum | report only (SU) | all year | 001U |
| Nitrogen, total [as N] | 30-day average | report only (mg/L) | Jul–Sep | 001U |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | Jul–Sep | 001U |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | report only (mg/L) | Jul–Sep | 001U |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | Jul–Sep | 001U |
| Nitrite + Nitrate total [as N] | 30-day average | report only (mg/L) | Jul–Sep | 001U |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | Jul–Sep | 001U |
| Phosphorus, total [as P] | 30-day average | report only (mg/L) | Jul–Sep | 001U |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jul–Sep | 001U |
| Nitrogen, total [as N] | 30-day average | report only (mg/L) | Aug | IM01 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | Aug | IM01 |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | report only (mg/L) | Aug | IM01 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | Aug | IM01 |
| Nitrite + Nitrate total [as N] | 30-day average | report only (mg/L) | Aug | IM01 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | Aug | IM01 |
| Nitrogen, total [as N] | 30-day average | report only (mg/L) | Aug | IM02 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | Aug | IM02 |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | report only (mg/L) | Aug | IM02 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | Aug | IM02 |
| Nitrite + Nitrate total [as N] | 30-day average | report only (mg/L) | Aug | IM02 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | Aug | IM02 |
Cited limits by parameter: Montana's rules and the federal ones.
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Your permit document is the final word. As JSON: /api/v1/permits/MT0030546 · MCP: https://passage-data.com/mcp