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Crude Petroleum And Natural Gas, St. Xavier, Montana. NPDES permit MT0023183, in force until Dec 31, 2027. Last 12 months: over a limit 2 times (last January 2026), 2 of 37 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Sulfide-hydrogen sulfide [undissociated], 30-day average | 500 ug/L | ≤ 2 ug/L | 24900% |
| January 2026 | Sulfide-hydrogen sulfide [undissociated], 30-day average | 500 ug/L | ≤ 2 ug/L | 24900% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Conductivity | daily maximum | ≤ 8000 uS/cm | all year |
| pH | minimum | ≥ 6.5 SU | all year |
| pH | maximum | ≤ 9 SU | all year |
| Oil & Grease | daily maximum | ≤ 10 mg/L | all year |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year |
| Fluoride, total [as F] | daily maximum | ≤ 2 mg/L | all year |
| Arsenic, total [as As] | daily maximum | report only (ug/L) | all year |
| Beryllium, total [as Be] | daily maximum | report only (ug/L) | all year |
| Cadmium, total [as Cd] | daily maximum | report only (ug/L) | all year |
| Chromium, total [as Cr] | daily maximum | report only (ug/L) | all year |
| Copper, total [as Cu] | daily maximum | report only (ug/L) | all year |
| Lead, total [as Pb] | daily maximum | report only (ug/L) | all year |
| Thallium, total [as Tl] | daily maximum | report only (ug/L) | all year |
| Nickel, total [as Ni] | daily maximum | report only (ug/L) | all year |
| Silver, total [as Ag] | daily maximum | report only (ug/L) | all year |
| Zinc, total [as Zn] | daily maximum | report only (ug/L) | all year |
| Antimony, total [as Sb] | daily maximum | report only (ug/L) | all year |
| Selenium, total [as Se] | daily maximum | report only (ug/L) | all year |
| Total phenols | daily maximum | report only (ug/L) | all year |
| Radium 226, total | 30-day average | report only (pCi/L) | all year |
| Dichlorobromomethane | daily maximum | report only (ug/L) | all year |
| Carbon tetrachloride | daily maximum | report only (ug/L) | all year |
| 1,2-Dichloroethane | daily maximum | report only (ug/L) | all year |
| Bromoform | daily maximum | report only (ug/L) | all year |
| Chloroform | daily maximum | report only (ug/L) | all year |
| Toluene | daily maximum | report only (ug/L) | all year |
| Benzene | daily maximum | report only (ug/L) | all year |
| Acenaphthylene | daily maximum | report only (ug/L) | all year |
| Acenaphthene | daily maximum | report only (ug/L) | all year |
| Acrolein | daily maximum | report only (ug/L) | all year |
| Acrylonitrile | daily maximum | report only (ug/L) | all year |
| Anthracene | daily maximum | report only (ug/L) | all year |
| Benzo[b]fluoranthene | daily maximum | report only (ug/L) | all year |
| Benzo[k]fluoranthene | daily maximum | report only (ug/L) | all year |
| Benzo[a]pyrene | daily maximum | report only (ug/L) | all year |
| Bis[2-chloroethyl] ether | daily maximum | report only (ug/L) | all year |
| Bis[2-chloroethoxy]methane | daily maximum | report only (ug/L) | all year |
| Bis[2-chloroisopropyl] ether | daily maximum | report only (ug/L) | all year |
| Butyl benzyl phthalate | daily maximum | report only (ug/L) | all year |
| Chlorobenzene | daily maximum | report only (ug/L) | all year |
| Chlorodibromomethane | daily maximum | report only (ug/L) | all year |
| Chrysene | daily maximum | report only (ug/L) | all year |
| Diethyl phthalate | daily maximum | report only (ug/L) | all year |
| Dimethyl phthalate | daily maximum | report only (ug/L) | all year |
| 1,2-Diphenylhydrazine | daily maximum | report only (ug/L) | all year |
| Ethylbenzene | daily maximum | report only (ug/L) | all year |
| Fluoranthene | daily maximum | report only (ug/L) | all year |
| Fluorene | daily maximum | report only (ug/L) | all year |
| Hexachlorocyclopentadiene | daily maximum | report only (ug/L) | all year |
| Hexachlorobutadiene | daily maximum | report only (ug/L) | all year |
| Hexachloroethane | daily maximum | report only (ug/L) | all year |
| Indeno[1,2,3-cd]pyrene | daily maximum | report only (ug/L) | all year |
| Isophorone | daily maximum | report only (ug/L) | all year |
| Methyl bromide [Bromomethane] | daily maximum | report only (ug/L) | all year |
| Methyl chloride [Chloromethane] | daily maximum | report only (ug/L) | all year |
| Methylene chloride | daily maximum | report only (ug/L) | all year |
| N-Nitrosodi-N-propylamine | daily maximum | report only (ug/L) | all year |
| N-Nitrosodiphenylamine | daily maximum | report only (ug/L) | all year |
| N-Nitrosodimethylamine [NDMA] | daily maximum | report only (ug/L) | all year |
| Nitrobenzene | daily maximum | report only (ug/L) | all year |
| Phenanthrene | daily maximum | report only (ug/L) | all year |
| Pyrene | daily maximum | report only (ug/L) | all year |
| Tetrachloroethylene | daily maximum | report only (ug/L) | all year |
| 1,1-Dichloroethane | daily maximum | report only (ug/L) | all year |
| 1,1-Dichloroethylene | daily maximum | report only (ug/L) | all year |
| 1,1,1-Trichloroethane | daily maximum | report only (ug/L) | all year |
| 1,1,2-Trichloroethane | daily maximum | report only (ug/L) | all year |
| 1,1,2,2-Tetrachloroethane | daily maximum | report only (ug/L) | all year |
| Benzo[ghi]perylene | daily maximum | report only (ug/L) | all year |
| Benzo[a]anthracene | daily maximum | report only (ug/L) | all year |
| 1,2-Dichlorobenzene | daily maximum | report only (ug/L) | all year |
| 1,2-Dichloropropane | daily maximum | report only (ug/L) | all year |
| trans-1,2-Dichloroethylene | daily maximum | report only (ug/L) | all year |
| 1,2,4-Trichlorobenzene | daily maximum | report only (ug/L) | all year |
| Dibenz[a,h]anthracene | daily maximum | report only (ug/L) | all year |
| 1,3-Dichlorobenzene | daily maximum | report only (ug/L) | all year |
| 1,4-Dichlorobenzene | daily maximum | report only (ug/L) | all year |
| 2-Chloroethyl vinyl ether, [mixed] | daily maximum | report only (ug/L) | all year |
| 2-Chloronaphthalene | daily maximum | report only (ug/L) | all year |
| 2-Chlorophenol | daily maximum | report only (ug/L) | all year |
| 2-Nitrophenol | daily maximum | report only (ug/L) | all year |
| Di-n-octyl phthalate | daily maximum | report only (ug/L) | all year |
| 2,4-Dichlorophenol | daily maximum | report only (ug/L) | all year |
| 2,4-Dimethylphenol | daily maximum | report only (ug/L) | all year |
| 2,4-Dinitrotoluene | daily maximum | report only (ug/L) | all year |
| 2,4-Dinitrophenol | daily maximum | report only (ug/L) | all year |
| 2,4,6-Trichlorophenol | daily maximum | report only (ug/L) | all year |
| 2,6-Dinitrotoluene | daily maximum | report only (ug/L) | all year |
| 3,3'-Dichlorobenzidine | daily maximum | report only (ug/L) | all year |
| 4-Bromophenyl phenyl ether | daily maximum | report only (ug/L) | all year |
| 4-Chlorophenyl phenyl ether | daily maximum | report only (ug/L) | all year |
| 4-Nitrophenol | daily maximum | report only (ug/L) | all year |
| 4,6-Dinitro-o-cresol | daily maximum | report only (ug/L) | all year |
| Phenol | daily maximum | report only (ug/L) | all year |
| Naphthalene | daily maximum | report only (ug/L) | all year |
| Pentachlorophenol | daily maximum | report only (ug/L) | all year |
| Di[2-ethylhexyl] phthalate [DEHP] | daily maximum | report only (ug/L) | all year |
| Di-n-butyl phthalate | daily maximum | report only (ug/L) | all year |
| Benzidine | daily maximum | report only (ug/L) | all year |
| Vinyl chloride | daily maximum | report only (ug/L) | all year |
| Trichloroethylene | daily maximum | report only (ug/L) | all year |
| Hexachlorobenzene | daily maximum | report only (ug/L) | all year |
| Floating solids, waste or visible foam-visual | instantaneous maximum | report only (N=0;Y=1) | all year |
| Chloride | 30-day average | report only (mg/L) | all year |
| Chloride | daily maximum | report only (mg/L) | all year |
| Flow, in conduit or thru treatment plant | 30-day average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| 1,3-Dichloropropylene | daily maximum | report only (ug/L) | all year |
| Sulfide-hydrogen sulfide [undissociated] | 30-day average | ≤ 2 ug/L | all year |
| Perfluorooctanoic acid (PFOA) | daily maximum | report only (ng/L) | all year |
| Perfluorobutanoic acid (PFBA) | daily maximum | report only (ng/L) | all year |
| Perfluorooctanesulfonamide (PFOSA) | daily maximum | report only (ng/L) | all year |
| Perfluoropentanoic acid (PFPeA) | daily maximum | report only (ng/L) | all year |
| Perfluorohexanoic acid (PFHxA) | daily maximum | report only (ng/L) | all year |
| Perfluoroheptanoic acid (PFHpA) | daily maximum | report only (ng/L) | all year |
| Perfluorononanoic acid (PFNA) | daily maximum | report only (ng/L) | all year |
| Perfluorodecanoic acid (PFDA) | daily maximum | report only (ng/L) | all year |
| Perfluoroundecanoic acid (PFUnA) | daily maximum | report only (ng/L) | all year |
| Perfluorododecanoic acid (PFDoA) | daily maximum | report only (ng/L) | all year |
| Perfluorotridecanoic acid (PFTrDA) | daily maximum | report only (ng/L) | all year |
| Perfluorotetradecanoic acid (PFTeDA) | daily maximum | report only (ng/L) | all year |
| N-ethyl perfluorooctanesulfonamidoethanol (NEtFOSE) | daily maximum | report only (ng/L) | all year |
| N-methyl perfluorooctanesulfonamidoethanol (NMeFOSE) | daily maximum | report only (ng/L) | all year |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | daily maximum | report only (ng/L) | all year |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | daily maximum | report only (ng/L) | all year |
| Perfluorobutanesulfonic acid (PFBS) | daily maximum | report only (ng/L) | all year |
| Perfluorodecanesulfonic acid (PFDS) | daily maximum | report only (ng/L) | all year |
| Perfluoroheptanesulfonic acid (PFHpS) | daily maximum | report only (ng/L) | all year |
| Perfluorohexanesulfonic acid (PFHxS) | daily maximum | report only (ng/L) | all year |
| Perfluorooctanesulfonic acid (PFOS) | daily maximum | report only (ng/L) | all year |
| 1H,1H,2H,2H-Perfluorohexane sulfonic acid (4:2 FTS) | daily maximum | report only (ng/L) | all year |
| 1H,1H,2H,2H-Perfluorooctane sulfonic acid (6:2 FTS) | daily maximum | report only (ng/L) | all year |
| 1H,1H, 2H, 2H-Perfluorodecane sulfonic acid (8:2 FTS) | daily maximum | report only (ng/L) | all year |
| Perfluoropentanesulfonic acid (PFPeS) | daily maximum | report only (ng/L) | all year |
| Perfluorononanesulfonic acid (PFNS) | daily maximum | report only (ng/L) | all year |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) | daily maximum | report only (ng/L) | all year |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | daily maximum | report only (ng/L) | all year |
| Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA) | daily maximum | report only (ng/L) | all year |
| Perfluorododecanesulfonic acid (PFDoS) | daily maximum | report only (ng/L) | all year |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | daily maximum | report only (ng/L) | all year |
| N-methyl perfluorooctanesulfonamide (NMeFOSA) | daily maximum | report only (ng/L) | all year |
| N-ethyl perfluorooctanesulfonamide (NEtFOSA) | daily maximum | report only (ng/L) | all year |
| Solids, total dissolved | 30-day average | ≤ 1500 mg/L | all year |
| Solids, total dissolved | 7-day average | ≤ 2300 mg/L | all year |
| Mercury, total [as Hg] | daily maximum | report only (ug/L) | all year |
| Sulfate | 30-day average | ≤ 1000 mg/L | all year |
| Sulfate | daily maximum | ≤ 1800 mg/L | all year |
| p-Chloro-m-cresol | daily maximum | report only (ug/L) | all year |
| Oil and grease visual | instantaneous maximum | ≤ 0 N=0;Y=1 | all year |
| Chloroethane | daily maximum | report only (ug/L) | all year |
| 3-Perfluoropropyl propanoic acid (3:3 FTCA) | daily maximum | report only (ng/L) | all year |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | daily maximum | report only (ng/L) | all year |
| 9-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (9Cl-PF3ONS) | daily maximum | report only (ng/L) | all year |
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | daily maximum | report only (ng/L) | all year |
| 3-Perfluoroheptyl propanoic acid (7:3 FTCA) | daily maximum | report only (ng/L) | all year |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | daily maximum | report only (ng/L) | all year |
| 2H,2H,3H,3H-Perfluorooctanoic acid (5:3 FTCA) | daily maximum | report only (ng/L) | all year |
| Pass/Fail Static 4 Day Chronic Pimephales Promelas | daily maximum | report only (pass=0;fail=1) | all year |
| Pass/Fail Static 4 Day Chronic Pimephales Promelas | daily maximum | report only (pass=0;fail=1) | all year |
| Pass/Fail Static 4 Day Chronic Pimephales Promelas | daily maximum | report only (pass=0;fail=1) | all year |
| Pass/Fail Static 4 Day Chronic Pimephales Promelas | daily maximum | report only (pass=0;fail=1) | all year |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Daphnia magna | daily maximum | report only (pass=0;fail=1) | all year |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Daphnia magna | daily maximum | report only (pass=0;fail=1) | all year |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Daphnia magna | daily maximum | report only (pass=0;fail=1) | all year |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Daphnia magna | daily maximum | report only (pass=0;fail=1) | all year |
Cited limits by parameter: Montana's rules and the federal ones.
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