Capstone Mining Corp- Pinto Valley Mine — NPDES permit AZ0020401: limits, due date and EPA's record

NPDES permit AZ0020401 · Major NON-POTW · effective, expires 2030-12-03 · 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: Solids, total suspended (2).

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 (224)

Outfall	Parameter	Statistic	Limit	Months
002	pH	MINIMUM	>= 6.5 SU	all year
002	pH	MAXIMUM	<= 9 SU	all year
002	Solids, total suspended	MO AVG	<= 20 mg/L	all year
002	Solids, total suspended	DAILY MX	<= 30 mg/L	all year
002	Cyanide, total [as CN]	MO AVG	report only	all year
002	Cyanide, total [as CN]	DAILY MX	report only	all year
002	Sulfide, total [as S]	MO AVG	report only	all year
002	Sulfide, total [as S]	DAILY MX	report only	all year
002	Hardness, total [as CaCO3]	MO AVG	report only	all year
002	Hardness, total [as CaCO3]	DAILY MX	report only	all year
002	Hardness, total [as CaCO3]	MO AVG	report only	all year
002	Hardness, total [as CaCO3]	DAILY MX	report only	all year
002	Arsenic, total recoverable	MO AVG	<= 30 ug/L	all year
002	Arsenic, total recoverable	DAILY MX	<= 60 ug/L	all year
002	Iron, total recoverable	MO AVG	report only	all year
002	Iron, total recoverable	DAILY MX	report only	all year
002	Selenium, total recoverable	MO AVG	<= 2 ug/L	all year
002	Selenium, total recoverable	DAILY MX	<= 3 ug/L	all year
002	Thallium, total recoverable	MO AVG	report only	all year
002	Thallium, total recoverable	DAILY MX	report only	all year
002	Beryllium, total recoverable [as Be]	MO AVG	report only	all year
002	Beryllium, total recoverable [as Be]	DAILY MX	report only	all year
002	Boron, total recoverable	MO AVG	report only	all year
002	Boron, total recoverable	DAILY MX	report only	all year
002	Chromium, total [as Cr]	MO AVG	report only	all year
002	Chromium, total [as Cr]	DAILY MX	report only	all year
002	Nickel, total recoverable	MO AVG	report only	all year
002	Nickel, total recoverable	DAILY MX	report only	all year
002	Silver total recoverable	MO AVG	report only	all year
002	Silver total recoverable	DAILY MX	report only	all year
002	Zinc, total recoverable	MO AVG	<= 190 ug/L	all year
002	Zinc, total recoverable	DAILY MX	<= 390 ug/L	all year
002	Cadmium, total recoverable	MO AVG	<= 6 ug/L	all year
002	Cadmium, total recoverable	DAILY MX	<= 12 ug/L	all year
002	Lead, total recoverable	MO AVG	<= 15 ug/L	all year
002	Lead, total recoverable	DAILY MX	<= 30 ug/L	all year
002	Copper, total recoverable	MO AVG	<= 26 ug/L	all year
002	Copper, total recoverable	DAILY MX	<= 52 ug/L	all year
002	Chromium, hexavalent dissolved [as Cr]	MO AVG	report only	all year
002	Chromium, hexavalent dissolved [as Cr]	DAILY MX	report only	all year
002	Antimony, total recoverable	MO AVG	report only	all year
002	Antimony, total recoverable	DAILY MX	report only	all year
002	Manganese, total recoverable	MO AVG	report only	all year
002	Manganese, total recoverable	DAILY MX	report only	all year
002	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
002	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
002	Hydrogen sulfide	MO AVG	report only	all year
002	Hydrogen sulfide	DAILY MX	report only	all year
002	Mercury, total recoverable	MO AVG	<= .01 ug/L	all year
002	Mercury, total recoverable	DAILY MX	<= .02 ug/L	all year
002	Pass/Fail Static 96Hr Acute Ceriodaphnia Dubia	MO MED	report only	all year
002	Pass/Fail Static 96Hr Acute Ceriodaphnia Dubia	DAILY MX	report only	all year
002	Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas	MO MED	report only	all year
002	Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas	DAILY MX	report only	all year
002	Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia	MO MED	report only	all year
002	Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia	DAILY MX	report only	all year
002	Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia	DAILY MX	report only	all year
002	Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d H costata	MO MED	report only	all year
002	Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d H costata	DAILY MX	report only	all year
002	Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d H costata	DAILY MX	report only	all year
002	Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas	MO MED	report only	all year
002	Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas	DAILY MX	report only	all year
002	Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas	DAILY MX	report only	all year
003	pH	MINIMUM	>= 6.5 SU	all year
003	pH	MAXIMUM	<= 9 SU	all year
003	Solids, total suspended	MO AVG	<= 20 mg/L	all year
003	Solids, total suspended	DAILY MX	<= 30 mg/L	all year
003	Cyanide, total [as CN]	MO AVG	report only	all year
003	Cyanide, total [as CN]	DAILY MX	report only	all year
003	Sulfide, total [as S]	MO AVG	report only	all year
003	Sulfide, total [as S]	DAILY MX	report only	all year
003	Hardness, total [as CaCO3]	MO AVG	report only	all year
003	Hardness, total [as CaCO3]	DAILY MX	report only	all year
003	Hardness, total [as CaCO3]	MO AVG	report only	all year
003	Hardness, total [as CaCO3]	DAILY MX	report only	all year
003	Arsenic, total recoverable	MO AVG	<= 30 ug/L	all year
003	Arsenic, total recoverable	DAILY MX	<= 60 ug/L	all year
003	Iron, total recoverable	MO AVG	report only	all year
003	Iron, total recoverable	DAILY MX	report only	all year
003	Selenium, total recoverable	MO AVG	<= 2 ug/L	all year
003	Selenium, total recoverable	DAILY MX	<= 3 ug/L	all year
003	Thallium, total recoverable	MO AVG	report only	all year
003	Thallium, total recoverable	DAILY MX	report only	all year
003	Beryllium, total recoverable [as Be]	MO AVG	report only	all year
003	Beryllium, total recoverable [as Be]	DAILY MX	report only	all year
003	Boron, total recoverable	MO AVG	report only	all year
003	Boron, total recoverable	DAILY MX	report only	all year
003	Chromium, total [as Cr]	MO AVG	report only	all year
003	Chromium, total [as Cr]	DAILY MX	report only	all year
003	Nickel, total recoverable	MO AVG	report only	all year
003	Nickel, total recoverable	DAILY MX	report only	all year
003	Silver total recoverable	MO AVG	report only	all year
003	Silver total recoverable	DAILY MX	report only	all year
003	Zinc, total recoverable	MO AVG	<= 190 ug/L	all year
003	Zinc, total recoverable	DAILY MX	<= 390 ug/L	all year
003	Cadmium, total recoverable	MO AVG	<= 6 ug/L	all year
003	Cadmium, total recoverable	DAILY MX	<= 12 ug/L	all year
003	Lead, total recoverable	MO AVG	<= 15 ug/L	all year
003	Lead, total recoverable	DAILY MX	<= 30 ug/L	all year
003	Copper, total recoverable	MO AVG	<= 26 ug/L	all year
003	Copper, total recoverable	DAILY MX	<= 52 ug/L	all year
003	Chromium, hexavalent dissolved [as Cr]	MO AVG	report only	all year
003	Chromium, hexavalent dissolved [as Cr]	DAILY MX	report only	all year
003	Antimony, total recoverable	MO AVG	report only	all year
003	Antimony, total recoverable	DAILY MX	report only	all year
003	Manganese, total recoverable	MO AVG	report only	all year
003	Manganese, total recoverable	DAILY MX	report only	all year
003	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
003	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
003	Hydrogen sulfide	MO AVG	report only	all year
003	Hydrogen sulfide	DAILY MX	report only	all year
003	Mercury, total recoverable	MO AVG	<= .01 ug/L	all year
003	Mercury, total recoverable	DAILY MX	<= .02 ug/L	all year
003	Pass/Fail Static 96Hr Acute Ceriodaphnia Dubia	MO MED	report only	all year
003	Pass/Fail Static 96Hr Acute Ceriodaphnia Dubia	DAILY MX	report only	all year
003	Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas	MO MED	report only	all year
003	Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas	DAILY MX	report only	all year
003	Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia	MO MED	report only	all year
003	Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia	DAILY MX	report only	all year
003	Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia	DAILY MX	report only	all year
003	Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d H costata	MO MED	report only	all year
003	Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d H costata	DAILY MX	report only	all year
003	Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d H costata	DAILY MX	report only	all year
003	Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas	MO MED	report only	all year
003	Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas	DAILY MX	report only	all year
003	Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas	DAILY MX	report only	all year
004	pH	MINIMUM	>= 6.5 SU	all year
004	pH	MAXIMUM	<= 9 SU	all year
004	Solids, total suspended	MO AVG	<= 20 mg/L	all year
004	Solids, total suspended	DAILY MX	<= 30 mg/L	all year
004	Cyanide, total [as CN]	MO AVG	report only	all year
004	Cyanide, total [as CN]	DAILY MX	report only	all year
004	Sulfide, total [as S]	MO AVG	report only	all year
004	Sulfide, total [as S]	DAILY MX	report only	all year
004	Hardness, total [as CaCO3]	MO AVG	report only	all year
004	Hardness, total [as CaCO3]	DAILY MX	report only	all year
004	Hardness, total [as CaCO3]	MO AVG	report only	all year
004	Hardness, total [as CaCO3]	DAILY MX	report only	all year
004	Arsenic, total recoverable	MO AVG	<= 30 ug/L	all year
004	Arsenic, total recoverable	DAILY MX	<= 60 ug/L	all year
004	Iron, total recoverable	MO AVG	report only	all year
004	Iron, total recoverable	DAILY MX	report only	all year
004	Selenium, total recoverable	MO AVG	<= 2 ug/L	all year
004	Selenium, total recoverable	DAILY MX	<= 3 ug/L	all year
004	Thallium, total recoverable	MO AVG	report only	all year
004	Thallium, total recoverable	DAILY MX	report only	all year
004	Beryllium, total recoverable [as Be]	MO AVG	report only	all year
004	Beryllium, total recoverable [as Be]	DAILY MX	report only	all year
004	Boron, total recoverable	MO AVG	report only	all year
004	Boron, total recoverable	DAILY MX	report only	all year
004	Chromium, total [as Cr]	MO AVG	report only	all year
004	Chromium, total [as Cr]	DAILY MX	report only	all year
004	Nickel, total recoverable	MO AVG	report only	all year
004	Nickel, total recoverable	DAILY MX	report only	all year
004	Silver total recoverable	MO AVG	report only	all year
004	Silver total recoverable	DAILY MX	report only	all year
004	Zinc, total recoverable	MO AVG	<= 190 ug/L	all year
004	Zinc, total recoverable	DAILY MX	<= 390 ug/L	all year
004	Cadmium, total recoverable	MO AVG	<= 6 ug/L	all year
004	Cadmium, total recoverable	DAILY MX	<= 12 ug/L	all year
004	Lead, total recoverable	MO AVG	<= 15 ug/L	all year
004	Lead, total recoverable	DAILY MX	<= 30 ug/L	all year
004	Copper, total recoverable	MO AVG	<= 26 ug/L	all year
004	Copper, total recoverable	DAILY MX	<= 52 ug/L	all year
004	Chromium, hexavalent dissolved [as Cr]	MO AVG	report only	all year
004	Chromium, hexavalent dissolved [as Cr]	DAILY MX	report only	all year
004	Antimony, total recoverable	MO AVG	report only	all year
004	Antimony, total recoverable	DAILY MX	report only	all year
004	Manganese, total recoverable	MO AVG	report only	all year
004	Manganese, total recoverable	DAILY MX	report only	all year
004	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
004	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
004	Hydrogen sulfide	MO AVG	report only	all year
004	Hydrogen sulfide	DAILY MX	report only	all year
004	Mercury, total recoverable	MO AVG	<= .01 ug/L	all year
004	Mercury, total recoverable	DAILY MX	<= .02 ug/L	all year
004	Pass/Fail Static 96Hr Acute Ceriodaphnia Dubia	MO MED	report only	all year
004	Pass/Fail Static 96Hr Acute Ceriodaphnia Dubia	DAILY MX	report only	all year
004	Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas	MO MED	report only	all year
004	Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas	DAILY MX	report only	all year
004	Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia	MO MED	report only	all year
004	Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia	DAILY MX	report only	all year
004	Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia	DAILY MX	report only	all year
004	Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d H costata	MO MED	report only	all year
004	Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d H costata	DAILY MX	report only	all year
004	Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d H costata	DAILY MX	report only	all year
004	Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas	MO MED	report only	all year
004	Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas	DAILY MX	report only	all year
004	Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas	DAILY MX	report only	all year
005	pH	MINIMUM	>= 6.5 SU	all year
005	pH	MAXIMUM	<= 9 SU	all year
005	Solids, total suspended	MO AVG	<= 20 mg/L	all year
005	Solids, total suspended	DAILY MX	<= 30 mg/L	all year
005	Sulfide, total [as S]	MO AVG	report only	all year
005	Sulfide, total [as S]	DAILY MX	report only	all year
005	Hardness, total [as CaCO3]	MO AVG	report only	all year
005	Hardness, total [as CaCO3]	DAILY MX	report only	all year
005	Hardness, total [as CaCO3]	MO AVG	report only	all year
005	Hardness, total [as CaCO3]	DAILY MX	report only	all year
005	Zinc, total recoverable	MO AVG	<= 500 ug/L	all year
005	Zinc, total recoverable	DAILY MX	<= 1000 ug/L	all year
005	Cadmium, total recoverable	MO AVG	<= 50 ug/L	all year
005	Cadmium, total recoverable	DAILY MX	<= 100 ug/L	all year
005	Lead, total recoverable	MO AVG	<= 300 ug/L	all year
005	Lead, total recoverable	DAILY MX	<= 600 ug/L	all year
005	Copper, total recoverable	MO AVG	<= 26 ug/L	all year
005	Copper, total recoverable	DAILY MX	<= 52 ug/L	all year
005	Copper, total recoverable	DAILY MX	<= .012 kg/d	all year
005	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
005	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
005	Hydrogen sulfide	MO AVG	report only	all year
005	Hydrogen sulfide	DAILY MX	report only	all year
005	Mercury, total recoverable	MO AVG	<= .01 ug/L	all year
005	Mercury, total recoverable	DAILY MX	<= .02 ug/L	all year
005	Pass/Fail Static Renewal 96Hr Acute Daphnia Magma	MO MED	report only	all year
005	Pass/Fail Static Renewal 96Hr Acute Daphnia Magma	DAILY MX	report only	all year
005	Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas	MO MED	report only	all year
005	Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas	DAILY MX	report only	all year
005	Daphnia magna survival 24 Hr Acute WET	MO MED	report only	all year
005	Daphnia magna survival 24 Hr Acute WET	DAILY MX	report only	all year
005	Daphnia Magna % Mortality 48 Hr Acute	DAILY MX	report only	all year
005	Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas	MO MED	report only	all year
005	Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas	DAILY MX	report only	all year
005	Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas	DAILY MX	report only	all year