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Capstone Mining Corp- Pinto Valley Mine

Copper Ores, major discharger, Miami, Arizona. NPDES permit AZ0020401, in force until Dec 3, 2030. Last 12 months: over a limit 2 times (last July 2026), 21 required values missing, 4 of 40 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 002 form A monthly (63 values), outfall 003 form A monthly (63 values), outfall 004 form A monthly (63 values), outfall 005 form A monthly (21 values), outfall 005 form Q quarterly, outfall 005 form Y yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 2 required values missing, 0 of 43 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
July 2026Solids, total suspended, daily maximum64 mg/L≤ 30 mg/L113%
July 2026Solids, total suspended, monthly average64 mg/L≤ 20 mg/L220%

Limits in force (224)

ParameterStatisticLimitMonthsOutfall
pHminimum≥ 6.5 SUall year002
pHmaximum≤ 9 SUall year002
Solids, total suspendedmonthly average≤ 20 mg/Lall year002
Solids, total suspendeddaily maximum≤ 30 mg/Lall year002
Cyanide, total [as CN]monthly averagereport only (ug/L)all year002
Cyanide, total [as CN]daily maximumreport only (ug/L)all year002
Sulfide, total [as S]monthly averagereport only (ug/L)all year002
Sulfide, total [as S]daily maximumreport only (ug/L)all year002
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year002
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year002
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year002
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year002
Arsenic, total recoverablemonthly average≤ 30 ug/Lall year002
Arsenic, total recoverabledaily maximum≤ 60 ug/Lall year002
Iron, total recoverablemonthly averagereport only (ug/L)all year002
Iron, total recoverabledaily maximumreport only (ug/L)all year002
Selenium, total recoverablemonthly average≤ 2 ug/Lall year002
Selenium, total recoverabledaily maximum≤ 3 ug/Lall year002
Thallium, total recoverablemonthly averagereport only (ug/L)all year002
Thallium, total recoverabledaily maximumreport only (ug/L)all year002
Beryllium, total recoverable [as Be]monthly averagereport only (ug/L)all year002
Beryllium, total recoverable [as Be]daily maximumreport only (ug/L)all year002
Boron, total recoverablemonthly averagereport only (ug/L)all year002
Boron, total recoverabledaily maximumreport only (ug/L)all year002
Chromium, total [as Cr]monthly averagereport only (ug/L)all year002
Chromium, total [as Cr]daily maximumreport only (ug/L)all year002
Nickel, total recoverablemonthly averagereport only (ug/L)all year002
Nickel, total recoverabledaily maximumreport only (ug/L)all year002
Silver total recoverablemonthly averagereport only (ug/L)all year002
Silver total recoverabledaily maximumreport only (ug/L)all year002
Zinc, total recoverablemonthly average≤ 190 ug/Lall year002
Zinc, total recoverabledaily maximum≤ 390 ug/Lall year002
Cadmium, total recoverablemonthly average≤ 6 ug/Lall year002
Cadmium, total recoverabledaily maximum≤ 12 ug/Lall year002
Lead, total recoverablemonthly average≤ 15 ug/Lall year002
Lead, total recoverabledaily maximum≤ 30 ug/Lall year002
Copper, total recoverablemonthly average≤ 26 ug/Lall year002
Copper, total recoverabledaily maximum≤ 52 ug/Lall year002
Chromium, hexavalent dissolved [as Cr]monthly averagereport only (ug/L)all year002
Chromium, hexavalent dissolved [as Cr]daily maximumreport only (ug/L)all year002
Antimony, total recoverablemonthly averagereport only (ug/L)all year002
Antimony, total recoverabledaily maximumreport only (ug/L)all year002
Manganese, total recoverablemonthly averagereport only (ug/L)all year002
Manganese, total recoverabledaily maximumreport only (ug/L)all year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Hydrogen sulfidemonthly averagereport only (ug/L)all year002
Hydrogen sulfidedaily maximumreport only (ug/L)all year002
Mercury, total recoverablemonthly average≤ .01 ug/Lall year002
Mercury, total recoverabledaily maximum≤ .02 ug/Lall year002
Pass/Fail Static 96Hr Acute Ceriodaphnia Dubiamonthly medianreport only (pass=0;fail=1)all year002
Pass/Fail Static 96Hr Acute Ceriodaphnia Dubiadaily maximumreport only (pass=0;fail=1)all year002
Pass/Fail Static Renewal 96Hr Acute Pimephales Promelasmonthly medianreport only (pass=0;fail=1)all year002
Pass/Fail Static Renewal 96Hr Acute Pimephales Promelasdaily maximumreport only (pass=0;fail=1)all year002
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiamonthly medianreport only (pass=0;fail=1)all year002
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiadaily maximumreport only (pass=0;fail=1)all year002
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiadaily maximumreport only (% effect)all year002
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d H costatamonthly medianreport only (pass=0;fail=1)all year002
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d H costatadaily maximumreport only (pass=0;fail=1)all year002
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d H costatadaily maximumreport only (% effect)all year002
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasmonthly medianreport only (pass=0;fail=1)all year002
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasdaily maximumreport only (pass=0;fail=1)all year002
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasdaily maximumreport only (% effect)all year002
pHminimum≥ 6.5 SUall year003
pHmaximum≤ 9 SUall year003
Solids, total suspendedmonthly average≤ 20 mg/Lall year003
Solids, total suspendeddaily maximum≤ 30 mg/Lall year003
Cyanide, total [as CN]monthly averagereport only (ug/L)all year003
Cyanide, total [as CN]daily maximumreport only (ug/L)all year003
Sulfide, total [as S]monthly averagereport only (ug/L)all year003
Sulfide, total [as S]daily maximumreport only (ug/L)all year003
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year003
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year003
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year003
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year003
Arsenic, total recoverablemonthly average≤ 30 ug/Lall year003
Arsenic, total recoverabledaily maximum≤ 60 ug/Lall year003
Iron, total recoverablemonthly averagereport only (ug/L)all year003
Iron, total recoverabledaily maximumreport only (ug/L)all year003
Selenium, total recoverablemonthly average≤ 2 ug/Lall year003
Selenium, total recoverabledaily maximum≤ 3 ug/Lall year003
Thallium, total recoverablemonthly averagereport only (ug/L)all year003
Thallium, total recoverabledaily maximumreport only (ug/L)all year003
Beryllium, total recoverable [as Be]monthly averagereport only (ug/L)all year003
Beryllium, total recoverable [as Be]daily maximumreport only (ug/L)all year003
Boron, total recoverablemonthly averagereport only (ug/L)all year003
Boron, total recoverabledaily maximumreport only (ug/L)all year003
Chromium, total [as Cr]monthly averagereport only (ug/L)all year003
Chromium, total [as Cr]daily maximumreport only (ug/L)all year003
Nickel, total recoverablemonthly averagereport only (ug/L)all year003
Nickel, total recoverabledaily maximumreport only (ug/L)all year003
Silver total recoverablemonthly averagereport only (ug/L)all year003
Silver total recoverabledaily maximumreport only (ug/L)all year003
Zinc, total recoverablemonthly average≤ 190 ug/Lall year003
Zinc, total recoverabledaily maximum≤ 390 ug/Lall year003
Cadmium, total recoverablemonthly average≤ 6 ug/Lall year003
Cadmium, total recoverabledaily maximum≤ 12 ug/Lall year003
Lead, total recoverablemonthly average≤ 15 ug/Lall year003
Lead, total recoverabledaily maximum≤ 30 ug/Lall year003
Copper, total recoverablemonthly average≤ 26 ug/Lall year003
Copper, total recoverabledaily maximum≤ 52 ug/Lall year003
Chromium, hexavalent dissolved [as Cr]monthly averagereport only (ug/L)all year003
Chromium, hexavalent dissolved [as Cr]daily maximumreport only (ug/L)all year003
Antimony, total recoverablemonthly averagereport only (ug/L)all year003
Antimony, total recoverabledaily maximumreport only (ug/L)all year003
Manganese, total recoverablemonthly averagereport only (ug/L)all year003
Manganese, total recoverabledaily maximumreport only (ug/L)all year003
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year003
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year003
Hydrogen sulfidemonthly averagereport only (ug/L)all year003
Hydrogen sulfidedaily maximumreport only (ug/L)all year003
Mercury, total recoverablemonthly average≤ .01 ug/Lall year003
Mercury, total recoverabledaily maximum≤ .02 ug/Lall year003
Pass/Fail Static 96Hr Acute Ceriodaphnia Dubiamonthly medianreport only (pass=0;fail=1)all year003
Pass/Fail Static 96Hr Acute Ceriodaphnia Dubiadaily maximumreport only (pass=0;fail=1)all year003
Pass/Fail Static Renewal 96Hr Acute Pimephales Promelasmonthly medianreport only (pass=0;fail=1)all year003
Pass/Fail Static Renewal 96Hr Acute Pimephales Promelasdaily maximumreport only (pass=0;fail=1)all year003
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiamonthly medianreport only (pass=0;fail=1)all year003
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiadaily maximumreport only (pass=0;fail=1)all year003
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiadaily maximumreport only (% effect)all year003
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d H costatamonthly medianreport only (pass=0;fail=1)all year003
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d H costatadaily maximumreport only (pass=0;fail=1)all year003
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d H costatadaily maximumreport only (% effect)all year003
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasmonthly medianreport only (pass=0;fail=1)all year003
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasdaily maximumreport only (pass=0;fail=1)all year003
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasdaily maximumreport only (% effect)all year003
pHminimum≥ 6.5 SUall year004
pHmaximum≤ 9 SUall year004
Solids, total suspendedmonthly average≤ 20 mg/Lall year004
Solids, total suspendeddaily maximum≤ 30 mg/Lall year004
Cyanide, total [as CN]monthly averagereport only (ug/L)all year004
Cyanide, total [as CN]daily maximumreport only (ug/L)all year004
Sulfide, total [as S]monthly averagereport only (ug/L)all year004
Sulfide, total [as S]daily maximumreport only (ug/L)all year004
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year004
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year004
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year004
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year004
Arsenic, total recoverablemonthly average≤ 30 ug/Lall year004
Arsenic, total recoverabledaily maximum≤ 60 ug/Lall year004
Iron, total recoverablemonthly averagereport only (ug/L)all year004
Iron, total recoverabledaily maximumreport only (ug/L)all year004
Selenium, total recoverablemonthly average≤ 2 ug/Lall year004
Selenium, total recoverabledaily maximum≤ 3 ug/Lall year004
Thallium, total recoverablemonthly averagereport only (ug/L)all year004
Thallium, total recoverabledaily maximumreport only (ug/L)all year004
Beryllium, total recoverable [as Be]monthly averagereport only (ug/L)all year004
Beryllium, total recoverable [as Be]daily maximumreport only (ug/L)all year004
Boron, total recoverablemonthly averagereport only (ug/L)all year004
Boron, total recoverabledaily maximumreport only (ug/L)all year004
Chromium, total [as Cr]monthly averagereport only (ug/L)all year004
Chromium, total [as Cr]daily maximumreport only (ug/L)all year004
Nickel, total recoverablemonthly averagereport only (ug/L)all year004
Nickel, total recoverabledaily maximumreport only (ug/L)all year004
Silver total recoverablemonthly averagereport only (ug/L)all year004
Silver total recoverabledaily maximumreport only (ug/L)all year004
Zinc, total recoverablemonthly average≤ 190 ug/Lall year004
Zinc, total recoverabledaily maximum≤ 390 ug/Lall year004
Cadmium, total recoverablemonthly average≤ 6 ug/Lall year004
Cadmium, total recoverabledaily maximum≤ 12 ug/Lall year004
Lead, total recoverablemonthly average≤ 15 ug/Lall year004
Lead, total recoverabledaily maximum≤ 30 ug/Lall year004
Copper, total recoverablemonthly average≤ 26 ug/Lall year004
Copper, total recoverabledaily maximum≤ 52 ug/Lall year004
Chromium, hexavalent dissolved [as Cr]monthly averagereport only (ug/L)all year004
Chromium, hexavalent dissolved [as Cr]daily maximumreport only (ug/L)all year004
Antimony, total recoverablemonthly averagereport only (ug/L)all year004
Antimony, total recoverabledaily maximumreport only (ug/L)all year004
Manganese, total recoverablemonthly averagereport only (ug/L)all year004
Manganese, total recoverabledaily maximumreport only (ug/L)all year004
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year004
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year004
Hydrogen sulfidemonthly averagereport only (ug/L)all year004
Hydrogen sulfidedaily maximumreport only (ug/L)all year004
Mercury, total recoverablemonthly average≤ .01 ug/Lall year004
Mercury, total recoverabledaily maximum≤ .02 ug/Lall year004
Pass/Fail Static 96Hr Acute Ceriodaphnia Dubiamonthly medianreport only (pass=0;fail=1)all year004
Pass/Fail Static 96Hr Acute Ceriodaphnia Dubiadaily maximumreport only (pass=0;fail=1)all year004
Pass/Fail Static Renewal 96Hr Acute Pimephales Promelasmonthly medianreport only (pass=0;fail=1)all year004
Pass/Fail Static Renewal 96Hr Acute Pimephales Promelasdaily maximumreport only (pass=0;fail=1)all year004
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiamonthly medianreport only (pass=0;fail=1)all year004
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiadaily maximumreport only (pass=0;fail=1)all year004
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiadaily maximumreport only (% effect)all year004
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d H costatamonthly medianreport only (pass=0;fail=1)all year004
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d H costatadaily maximumreport only (pass=0;fail=1)all year004
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d H costatadaily maximumreport only (% effect)all year004
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasmonthly medianreport only (pass=0;fail=1)all year004
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasdaily maximumreport only (pass=0;fail=1)all year004
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasdaily maximumreport only (% effect)all year004
pHminimum≥ 6.5 SUall year005
pHmaximum≤ 9 SUall year005
Solids, total suspendedmonthly average≤ 20 mg/Lall year005
Solids, total suspendeddaily maximum≤ 30 mg/Lall year005
Sulfide, total [as S]monthly averagereport only (ug/L)all year005
Sulfide, total [as S]daily maximumreport only (ug/L)all year005
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year005
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year005
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year005
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year005
Zinc, total recoverablemonthly average≤ 500 ug/Lall year005
Zinc, total recoverabledaily maximum≤ 1000 ug/Lall year005
Cadmium, total recoverablemonthly average≤ 50 ug/Lall year005
Cadmium, total recoverabledaily maximum≤ 100 ug/Lall year005
Lead, total recoverablemonthly average≤ 300 ug/Lall year005
Lead, total recoverabledaily maximum≤ 600 ug/Lall year005
Copper, total recoverablemonthly average≤ 26 ug/Lall year005
Copper, total recoverabledaily maximum≤ 52 ug/Lall year005
Copper, total recoverabledaily maximum≤ .012 kg/dall year005
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year005
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year005
Hydrogen sulfidemonthly averagereport only (ug/L)all year005
Hydrogen sulfidedaily maximumreport only (ug/L)all year005
Mercury, total recoverablemonthly average≤ .01 ug/Lall year005
Mercury, total recoverabledaily maximum≤ .02 ug/Lall year005
Pass/Fail Static Renewal 96Hr Acute Daphnia Magmamonthly medianreport only (pass=0;fail=1)all year005
Pass/Fail Static Renewal 96Hr Acute Daphnia Magmadaily maximumreport only (pass=0;fail=1)all year005
Pass/Fail Static Renewal 96Hr Acute Pimephales Promelasmonthly medianreport only (pass=0;fail=1)all year005
Pass/Fail Static Renewal 96Hr Acute Pimephales Promelasdaily maximumreport only (pass=0;fail=1)all year005
Daphnia magna survival 24 Hr Acute WETmonthly medianreport only (pass=0;fail=1)all year005
Daphnia magna survival 24 Hr Acute WETdaily maximumreport only (pass=0;fail=1)all year005
Daphnia Magna % Mortality 48 Hr Acutedaily maximumreport only (% effect)all year005
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasmonthly medianreport only (pass=0;fail=1)all year005
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasdaily maximumreport only (pass=0;fail=1)all year005
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasdaily maximumreport only (% effect)all year005

How strict are these limits?

Cited limits by parameter: Arizona's rules and the federal ones.

Same industry: the 8 Metal Mining permits in Arizona.

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Your permit document is the final word. As JSON: /api/v1/permits/AZ0020401 · MCP: https://passage-data.com/mcp