EPA · Montana · discharge permits by parameter
Chromium, hexavalent [as Cr] in Montana
- 3Permits carrying a limit
- 1With a recorded exceedance
- 1,004Nationwide
Permits
Other parameters in Montana
- Solids, total suspended566
- pH350
- Nitrite + Nitrate total [as N]341
- Flow rate323
- Nitrogen, total [as N]270
- BOD, 5-day, 20 deg. C267
- Phosphorus, total [as P]263
- Nitrogen, ammonia total [as N]248
- Nitrogen, Kjeldahl, total [as N]234
- E. coli, MTEC-MF198
- Oil and grease visual190
- Oil and grease, hexane extr method161
- Oil & Grease147
- BOD, 5-day, percent removal118
- Chlorine, total residual109
- Temperature, water deg. centigrade102
- Solids, suspended percent removal97
- Water level at sample collection time91
- Turbidity86
- Specific conductance86
- Solids, total dissolved [TDS]85
- Copper, total recoverable82
- Chloride [as Cl]82
- Lead, total recoverable72
- Iron, total [as Fe]71
- Zinc, total recoverable69
- Flow rate64
- Chemical Oxygen Demand [COD]63
- Duration of discharge60
- Hardness, total [as CaCO3]57
- Outfall observation,visual, y/n response57
- Duration56
- Cadmium, total recoverable53
- Arsenic, total recoverable53
- Conductivity51
- Zinc, total [as Zn]45
- Temperature, water deg. fahrenheit43
- Coliform, fecal general42
- Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas42
- Iron, total recoverable41
- Oxygen, dissolved [DO]41
- Selenium, total recoverable41
- Aluminum, dissolved [as Al]41
- Mercury, total recoverable40
- Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubia39
- Chromium, total recoverable37
- Flow, in conduit or thru treatment plant37
- Lead, total [as Pb]33
- Nickel, total recoverable33
- Sulfate, total [as SO4]32
- Silver total recoverable31
- Copper, total [as Cu]30
- Arsenic, total [as As]29
- Report due [yrmoda]29
- Antimony, total recoverable26
- Cyanide, total [as CN]26
- Cadmium, total [as Cd]25
- Thallium, total recoverable23
- Nitrogen, nitrate total [as N]23
- Nickel, total [as Ni]22