Climax Molybdenum Company — NPDES permit CO0000230: limits, due date and EPA's record

NPDES permit CO0000230 · Major NON-POTW · effective, expires 2030-03-31 · EPA's file as of 2026-09-19

EPA's record, 2025-09-01 to 2026-08-31

Last period with anything received: 2026-07-31. Most often over: Chlorine, total residual (1).

Reporting

Reports are due about 28 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (265)

Outfall	Parameter	Statistic	Limit	Months
007	Temperature, water deg. centigrade	MX WK AV	<= 38.6 deg C	Apr
007	Temperature, water deg. centigrade	MX WK AV	<= 20.4 deg C	May
007	Temperature, water deg. centigrade	MX WK AV	report only	Jun
007	Temperature, water deg. centigrade	MX WK AV	<= 22.4 deg C	Jul
007	Temperature, water deg. centigrade	MX WK AV	<= 24.1 deg C	Aug
007	Temperature, water deg. centigrade	MX WK AV	<= 47 deg C	Sep
007	Temperature, water deg. centigrade	MX WK AV	<= 9 deg C	Oct
007	Temperature, water deg. centigrade	MX WK AV	<= 57 deg C	Nov
007	Temperature, water deg. centigrade	MX WK AV	<= 57 deg C	Dec
007	Temperature, water deg. centigrade	MX WK AV	<= 57 deg C	Jan
007	Temperature, water deg. centigrade	MX WK AV	<= 57 deg C	Feb
007	Temperature, water deg. centigrade	MX WK AV	<= 57 deg C	Mar
007	Temperature, water deg. centigrade	DAILY MX	<= 13 deg C	Apr
007	Temperature, water deg. centigrade	DAILY MX	<= 18.5 deg C	May
007	Temperature, water deg. centigrade	DAILY MX	report only	Jun
007	Temperature, water deg. centigrade	DAILY MX	<= 21.7 deg C	Jul
007	Temperature, water deg. centigrade	DAILY MX	<= 21.7 deg C	Aug
007	Temperature, water deg. centigrade	DAILY MX	<= 50.4 deg C	Sep
007	Temperature, water deg. centigrade	DAILY MX	<= 13 deg C	Oct
007	Temperature, water deg. centigrade	DAILY MX	report only	Nov
007	Temperature, water deg. centigrade	DAILY MX	report only	Dec
007	Temperature, water deg. centigrade	DAILY MX	report only	Jan
007	Temperature, water deg. centigrade	DAILY MX	report only	Feb
007	Temperature, water deg. centigrade	DAILY MX	report only	Mar
007	Conductivity	30DA AVG	<= 14 dS/m	all year
007	pH	MINIMUM	>= 6.5 SU	all year
007	pH	MAXIMUM	<= 9 SU	all year
007	Bicarbonate ion- [as HCO3]	30DA AVG	report only	all year
007	Bicarbonate ion- [as HCO3]	DAILY MX	report only	all year
007	Solids, total suspended	30DA AVG	<= 20 mg/L	all year
007	Solids, total suspended	DAILY MX	<= 30 mg/L	all year
007	Nitrogen, ammonia total [as N]	30DA AVG	<= 44 mg/L	Jan
007	Nitrogen, ammonia total [as N]	30DA AVG	<= 39 mg/L	Feb
007	Nitrogen, ammonia total [as N]	30DA AVG	<= 43 mg/L	Mar
007	Nitrogen, ammonia total [as N]	30DA AVG	<= 51 mg/L	Apr
007	Nitrogen, ammonia total [as N]	30DA AVG	<= 65 mg/L	May
007	Nitrogen, ammonia total [as N]	30DA AVG	<= 65 mg/L	Jun
007	Nitrogen, ammonia total [as N]	30DA AVG	<= 65 mg/L	Jul
007	Nitrogen, ammonia total [as N]	30DA AVG	<= 65 mg/L	Aug
007	Nitrogen, ammonia total [as N]	30DA AVG	<= 29 mg/L	Sep
007	Nitrogen, ammonia total [as N]	30DA AVG	<= 46 mg/L	Oct
007	Nitrogen, ammonia total [as N]	30DA AVG	<= 65 mg/L	Nov
007	Nitrogen, ammonia total [as N]	30DA AVG	<= 56 mg/L	Dec
007	Nitrogen, ammonia total [as N]	DAILY MX	<= 65 mg/L	Jan
007	Nitrogen, ammonia total [as N]	DAILY MX	<= 65 mg/L	Feb
007	Nitrogen, ammonia total [as N]	DAILY MX	<= 65 mg/L	Mar
007	Nitrogen, ammonia total [as N]	DAILY MX	<= 65 mg/L	Apr
007	Nitrogen, ammonia total [as N]	DAILY MX	<= 65 mg/L	May
007	Nitrogen, ammonia total [as N]	DAILY MX	<= 65 mg/L	Jun
007	Nitrogen, ammonia total [as N]	DAILY MX	<= 65 mg/L	Jul
007	Nitrogen, ammonia total [as N]	DAILY MX	<= 65 mg/L	Aug
007	Nitrogen, ammonia total [as N]	DAILY MX	<= 58 mg/L	Sep
007	Nitrogen, ammonia total [as N]	DAILY MX	<= 65 mg/L	Oct
007	Nitrogen, ammonia total [as N]	DAILY MX	<= 65 mg/L	Nov
007	Nitrogen, ammonia total [as N]	DAILY MX	<= 65 mg/L	Dec
007	Nitrogen, inorganic total	DAILY MX	<= 109 mg/L	all year
007	Phosphorus, total [as P]	30DA AVG	<= 1.3 mg/L	all year
007	Cyanide, weak acid, dissociable	DAILY MX	<= 55 ug/L	all year
007	Calcium, total recoverable	30DA AVG	report only	all year
007	Calcium, total recoverable	DAILY MX	report only	all year
007	Magnesium, total recoverable	30DA AVG	report only	all year
007	Magnesium, total recoverable	DAILY MX	report only	all year
007	Sodium, total recoverable	30DA AVG	report only	all year
007	Sodium, total recoverable	DAILY MX	report only	all year
007	Sodium adsorption ratio	30DA AVG	report only	all year
007	Sodium adsorption ratio	DAILY MX	report only	all year
007	Sodium adsorption ratio	30DA AVG	report only	all year
007	Sodium adsorption ratio	DAILY MX	report only	all year
007	Chloride [as Cl]	30DA AVG	<= 2942 mg/L	all year
007	Arsenic, total recoverable	30DA AVG	<= 3 ug/L	all year
007	Arsenic, total recoverable	DAILY MX	<= 1000 ug/L	all year
007	Iron, total recoverable	30DA AVG	<= 9777 ug/L	all year
007	Beryllium, total recoverable [as Be]	30DA AVG	report only	all year
007	Beryllium, total recoverable [as Be]	ROLL AVG	report only	all year
007	Iron, dissolved [as Fe]	30DA AVG	<= 1625 ug/L	all year
007	Manganese, dissolved [as Mn]	30DA AVG	<= 415 ug/L	all year
007	Thallium, dissolved [as Tl]	30DA AVG	<= 2.8 ug/L	all year
007	Thallium, total [as Tl]	30DA AVG	<= 5.9 ug/L	all year
007	Nickel, total recoverable	30DA AVG	report only	all year
007	Zinc, total recoverable	30DA AVG	<= 500 ug/L	all year
007	Zinc, total recoverable	DAILY MX	<= 1000 ug/L	all year
007	Antimony, dissolved [as Sb]	30DA AVG	report only	all year
007	Antimony, total [as Sb]	30DA AVG	report only	all year
007	Aluminum, total recoverable	30DA AVG	<= 1024 ug/L	all year
007	Aluminum, total recoverable	DAILY MX	<= 7898 ug/L	all year
007	Cadmium, total recoverable	30DA AVG	<= 50 ug/L	all year
007	Cadmium, total recoverable	DAILY MX	<= 55 ug/L	all year
007	Lead, total recoverable	30DA AVG	<= 300 ug/L	all year
007	Lead, total recoverable	DAILY MX	<= 549 ug/L	all year
007	Chromium, total recoverable	DAILY MX	report only	all year
007	Copper, total recoverable	30DA AVG	<= 150 ug/L	all year
007	Copper, total recoverable	DAILY MX	<= 300 ug/L	all year
007	Molybdenum, total recoverable	30DA AVG	<= 2236 ug/L	all year
007	Chromium, hexavalent dissolved [as Cr]	30DA AVG	report only	all year
007	Chromium, hexavalent dissolved [as Cr]	DAILY MX	report only	all year
007	Zinc, potentially dissolved	30DA AVG	<= 446 ug/L	all year
007	Zinc, potentially dissolved	DAILY MX	<= 571 ug/L	all year
007	Silver, potentially dissolved	30DA AVG	<= .13 ug/L	all year
007	Silver, potentially dissolved	DAILY MX	<= 3.2 ug/L	all year
007	Copper, potentially dissolved	30DA AVG	<= 29 ug/L	all year
007	Copper, potentially dissolved	DAILY MX	<= 41 ug/L	all year
007	Cadmium, potentially dissolvd	30DA AVG	<= 3.5 ug/L	all year
007	Cadmium, potentially dissolvd	DAILY MX	<= 6.8 ug/L	all year
007	Chromium, trivalent, potentially dissolvd	30DA AVG	report only	all year
007	Lead, potentially dissolvd	30DA AVG	<= 7.3 ug/L	all year
007	Lead, potentially dissolvd	DAILY MX	<= 197 ug/L	all year
007	Manganese, potentially dissolvd	30DA AVG	<= 13115 ug/L	all year
007	Manganese, potentially dissolvd	DAILY MX	<= 22313 ug/L	all year
007	Nickel, potentially dissolvd	30DA AVG	report only	all year
007	Nickel, potentially dissolvd	DAILY MX	report only	all year
007	Selenium, potentially dissolvd	30DA AVG	report only	all year
007	Selenium, potentially dissolvd	DAILY MX	report only	all year
007	Uranium, potentially dissolvd	30DA AVG	report only	all year
007	Uranium, potentially dissolvd	DAILY MX	report only	all year
007	Oil and grease	INST MAX	<= 10 mg/L	all year
007	Chromium, trivalent total recoverable	DAILY MX	report only	all year
007	Radium 226 + radium 228, total	30DA AVG	report only	all year
007	Uranium, total	30DA AVG	report only	all year
007	Benzo[b]fluoranthene	30DA AVG	<= .06 ug/L	all year
007	Benzo[k]fluoranthene	30DA AVG	<= .6 ug/L	all year
007	Benzo[a]pyrene	30DA AVG	<= .006 ug/L	all year
007	Chrysene	30DA AVG	<= 6 ug/L	all year
007	Fluoranthene	30DA AVG	<= 1530 ug/L	all year
007	Indeno[1,2,3-cd]pyrene	30DA AVG	<= .06 ug/L	all year
007	Pyrene	30DA AVG	<= 2472 ug/L	all year
007	Benzo[a]anthracene	30DA AVG	<= .06 ug/L	all year
007	Dibenz[a,h]anthracene	30DA AVG	<= .006 ug/L	all year
007	Flow, in conduit or thru treatment plant	30DA AVG	<= .864 MGD	all year
007	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
007	Chlorine, total residual	30DA AVG	<= .13 mg/L	all year
007	Chlorine, total residual	DAILY MX	<= .21 mg/L	all year
007	Mercury, total [low level]	30DA AVG	<= .11 ug/L	all year
007	Mercury, total [low level]	DAILY MX	<= 2 ug/L	all year
007	Acrylamide	30DA AVG	<= .26 ug/L	all year
007	E. coli	30DA AVG	<= 1472 #/100mL	all year
007	E. coli	DAILY MX	<= 2944 #/100mL	all year
007	Sulfide-hydrogen sulfide [undissociated]	30DA AVG	<= .024 mg/L	all year
007	Perfluorooctanoic acid (PFOA)	30DA AVG	report only	all year
007	Perfluorooctanoic acid (PFOA)	DAILY MX	report only	all year
007	Perfluorobutanoic acid (PFBA)	30DA AVG	report only	all year
007	Perfluorobutanoic acid (PFBA)	DAILY MX	report only	all year
007	Perfluorooctanesulfonamide (PFOSA)	30DA AVG	report only	all year
007	Perfluorooctanesulfonamide (PFOSA)	DAILY MX	report only	all year
007	Sodium Absorption Ratio	INST MAX	report only	all year
007	Perfluoropentanoic acid (PFPeA)	30DA AVG	report only	all year
007	Perfluoropentanoic acid (PFPeA)	DAILY MX	report only	all year
007	Perfluorohexanoic acid (PFHxA)	30DA AVG	report only	all year
007	Perfluorohexanoic acid (PFHxA)	DAILY MX	report only	all year
007	Perfluoroheptanoic acid (PFHpA)	30DA AVG	report only	all year
007	Perfluoroheptanoic acid (PFHpA)	DAILY MX	report only	all year
007	Perfluorononanoic acid (PFNA)	30DA AVG	report only	all year
007	Perfluorononanoic acid (PFNA)	DAILY MX	report only	all year
007	Perfluorodecanoic acid (PFDA)	30DA AVG	report only	all year
007	Perfluorodecanoic acid (PFDA)	DAILY MX	report only	all year
007	Perfluoroundecanoic acid (PFUnA)	30DA AVG	report only	all year
007	Perfluoroundecanoic acid (PFUnA)	DAILY MX	report only	all year
007	Perfluorododecanoic acid (PFDoA)	30DA AVG	report only	all year
007	Perfluorododecanoic acid (PFDoA)	DAILY MX	report only	all year
007	Perfluorotridecanoic acid (PFTrDA)	30DA AVG	report only	all year
007	Perfluorotridecanoic acid (PFTrDA)	DAILY MX	report only	all year
007	Perfluorotetradecanoic acid (PFTeDA)	30DA AVG	report only	all year
007	Perfluorotetradecanoic acid (PFTeDA)	DAILY MX	report only	all year
007	N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)	30DA AVG	report only	all year
007	N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)	DAILY MX	report only	all year
007	N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)	30DA AVG	report only	all year
007	N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)	DAILY MX	report only	all year
007	Perfluorobutanesulfonic acid (PFBS)	30DA AVG	<= 4707692 ng/L	all year
007	Perfluorobutanesulfonic acid (PFBS)	DAILY MX	report only	all year
007	Perfluorodecanesulfonic acid (PFDS)	30DA AVG	report only	all year
007	Perfluorodecanesulfonic acid (PFDS)	DAILY MX	report only	all year
007	Perfluoroheptanesulfonic acid (PFHpS)	30DA AVG	report only	all year
007	Perfluoroheptanesulfonic acid (PFHpS)	DAILY MX	report only	all year
007	Perfluorohexanesulfonic acid (PFHxS)	30DA AVG	report only	all year
007	Perfluorohexanesulfonic acid (PFHxS)	DAILY MX	<= 8238 ng/L	all year
007	Perfluorooctanesulfonic acid (PFOS)	30DA AVG	report only	all year
007	Perfluorooctanesulfonic acid (PFOS)	DAILY MX	report only	all year
007	1H,1H,2H,2H-Perfluorohexane sulfonic acid (4:2 FTS)	30DA AVG	report only	all year
007	1H,1H,2H,2H-Perfluorohexane sulfonic acid (4:2 FTS)	DAILY MX	report only	all year
007	1H,1H,2H,2H-Perfluorooctane sulfonic acid (6:2 FTS)	30DA AVG	report only	all year
007	1H,1H,2H,2H-Perfluorooctane sulfonic acid (6:2 FTS)	DAILY MX	report only	all year
007	1H,1H, 2H, 2H-Perfluorodecane sulfonic acid (8:2 FTS)	30DA AVG	report only	all year
007	1H,1H, 2H, 2H-Perfluorodecane sulfonic acid (8:2 FTS)	DAILY MX	report only	all year
007	Perfluoropentanesulfonic acid (PFPeS)	30DA AVG	report only	all year
007	Perfluoropentanesulfonic acid (PFPeS)	DAILY MX	report only	all year
007	Perfluorononanesulfonic acid (PFNS)	30DA AVG	report only	all year
007	Perfluorononanesulfonic acid (PFNS)	DAILY MX	report only	all year
007	Hexafluoropropylene oxide dimer acid (HFPO-DA)	30DA AVG	report only	all year
007	Hexafluoropropylene oxide dimer acid (HFPO-DA)	DAILY MX	report only	all year
007	Sulfate	30DA AVG	<= 2881 mg/L	all year
007	Boron, total	30DA AVG	report only	all year
007	Oil and grease visual	INST MAX	report only	all year
007	PFAS Sum	30DA AVG	<= 824 ng/L	all year
007	PFAS Sum	DAILY MX	<= 770 ng/L	all year
007	TU Static Renewal 7-Day Chronic Ceriodaphnia dubia	SINGSAMP	report only	all year
007	TU Static Renewal 7-Day Chronic Ceriodaphnia dubia	MN VALUE	report only	all year
007	TU Static Renewal 7-Day Chronic Ceriodaphnia dubia	MN VALUE	>= 8 tox chronic	all year
007	TU Static Renewal 7-Day Chronic Pimphales promelas	SINGSAMP	report only	all year
007	TU Static Renewal 7-Day Chronic Pimphales promelas	MN VALUE	report only	all year
007	TU Static Renewal 7-Day Chronic Pimphales promelas	MN VALUE	>= 8 tox chronic	all year
008	BOD, 5-day, 20 deg. C	30DA AVG	report only	all year
008	BOD, 5-day, 20 deg. C	30DA AVG	report only	all year
008	BOD, 5-day, 20 deg. C	MX 7D AV	report only	all year
008	BOD, 5-day, 20 deg. C	MX 7D AV	report only	all year
008	pH	MINIMUM	>= 5.3 SU	all year
008	pH	MAXIMUM	<= 9 SU	all year
008	Solids, total suspended	30DA AVG	report only	all year
008	Solids, total suspended	30DA AVG	report only	all year
008	Solids, total suspended	MX 7D AV	report only	all year
008	Solids, total suspended	MX 7D AV	report only	all year
008	Oil and grease	INST MAX	<= 10 mg/L	all year
008	Flow, in conduit or thru treatment plant	30DA AVG	<= .014 MGD	all year
008	Chlorine, total residual	INST MAX	<= 1.39 mg/L	all year
008	Oil and grease visual	INST MAX	report only	all year
009	Area inspection visual	INST MAX	report only	all year
009	Area inspection visual	INST MAX	report only	Dec
010	Area inspection visual	INST MAX	report only	all year
010	Area inspection visual	INST MAX	report only	Dec
011	Area inspection visual	INST MAX	report only	all year
011	Area inspection visual	INST MAX	report only	Dec
012	Area inspection visual	INST MAX	report only	all year
012	Area inspection visual	INST MAX	report only	Dec
013	Area inspection visual	INST MAX	report only	all year
013	Area inspection visual	INST MAX	report only	Dec
014	Area inspection visual	INST MAX	report only	all year
014	Area inspection visual	INST MAX	report only	Dec
015	Area inspection visual	INST MAX	report only	all year
015	Area inspection visual	INST MAX	report only	Dec
016	Area inspection visual	INST MAX	report only	all year
016	Area inspection visual	INST MAX	report only	Dec
017	Area inspection visual	INST MAX	report only	all year
017	Area inspection visual	INST MAX	report only	Dec
018	Area inspection visual	INST MAX	report only	all year
018	Area inspection visual	INST MAX	report only	Dec
019	Area inspection visual	INST MAX	report only	all year
019	Area inspection visual	INST MAX	report only	Dec
020	Area inspection visual	INST MAX	report only	all year
020	Area inspection visual	INST MAX	report only	Dec
021	Area inspection visual	INST MAX	report only	all year
021	Area inspection visual	INST MAX	report only	Dec
022	Area inspection visual	INST MAX	report only	all year
022	Area inspection visual	INST MAX	report only	Dec
023	Area inspection visual	INST MAX	report only	all year
023	Area inspection visual	INST MAX	report only	Dec
024	Area inspection visual	INST MAX	report only	all year
024	Area inspection visual	INST MAX	report only	Dec
025	Area inspection visual	INST MAX	report only	all year
025	Area inspection visual	INST MAX	report only	Dec
026	Area inspection visual	INST MAX	report only	all year
026	Area inspection visual	INST MAX	report only	Dec
027	Area inspection visual	INST MAX	report only	all year
027	Area inspection visual	INST MAX	report only	Dec
028	Area inspection visual	INST MAX	report only	all year
028	Area inspection visual	INST MAX	report only	Dec
029	Area inspection visual	INST MAX	report only	all year
029	Area inspection visual	INST MAX	report only	Dec
030	Area inspection visual	INST MAX	report only	all year
030	Area inspection visual	INST MAX	report only	Dec
031	Area inspection visual	INST MAX	report only	all year
031	Area inspection visual	INST MAX	report only	Dec
032	Area inspection visual	INST MAX	report only	all year
032	Area inspection visual	INST MAX	report only	Dec
DST1	Hardness, total [as CaCO3]	30DA AVG	report only	all year
DST1	Hardness, total [as CaCO3]	DAILY MX	report only	all year
UST1	Temperature, water deg. centigrade	MX WK AV	report only	all year
UST1	Temperature, water deg. centigrade	DAILY MX	report only	all year