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Gold Ores, major discharger, Lead, South Dakota. NPDES permit SD0025852, in force until Aug 31, 2028. Last 12 months: over a limit once (last August 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| August 2026 | Selenium, total recoverable, 30-day average | 5.87 ug/L | ≤ 5 ug/L | 17% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | 30-day average | report only (deg F) | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Temperature, water deg. fahrenheit | 30-day average | report only (deg F) | Apr–Sep | 001 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | Apr–Sep | 001 |
| Flow rate | 30-day average | report only (MGD) | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Flow rate | 30-day average | report only (MGD) | Apr–Sep | 001 |
| Flow rate | daily maximum | report only (MGD) | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Flow rate | daily maximum | report only (MGD) | Apr–Sep | 001 |
| pH | daily minimum | ≥ 6.5 SU | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| pH | daily minimum | ≥ 6.5 SU | Apr–Sep | 001 |
| pH | daily maximum | ≤ 9 SU | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| pH | daily maximum | ≤ 9 SU | Apr–Sep | 001 |
| Solids, total suspended | 30-day average | ≤ 90 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Solids, total suspended | 30-day average | ≤ 90 mg/L | Apr–Sep | 001 |
| Solids, total suspended | daily maximum | ≤ 158 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Solids, total suspended | daily maximum | ≤ 158 mg/L | Apr–Sep | 001 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | all year | 001 |
| Nitrogen, nitrate total [as N] | 30-day average | ≤ 50 mg/L | all year | 001 |
| Nitrogen, nitrate total [as N] | daily maximum | ≤ 88 mg/L | all year | 001 |
| Cyanide, weak acid, dissociable | 30-day average | ≤ 5.2 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Cyanide, weak acid, dissociable | 30-day average | ≤ 5.2 ug/L | Apr–Sep | 001 |
| Cyanide, weak acid, dissociable | daily maximum | ≤ 22 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Cyanide, weak acid, dissociable | daily maximum | ≤ 22 ug/L | Apr–Sep | 001 |
| Hardness, total [as CaCO3] | 30-day average | report only (mg/L) | Apr–Sep | 001 |
| Hardness, total [as CaCO3] | 30-day average | report only (mg/L) | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | Apr–Sep | 001 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Arsenic, total recoverable | 30-day average | ≤ 150 ug/L | all year | 001 |
| Arsenic, total recoverable | daily maximum | ≤ 340 ug/L | all year | 001 |
| Selenium, total recoverable | 30-day average | ≤ 5 ug/L | Apr–Sep | 001 |
| Selenium, total recoverable | 30-day average | ≤ 5 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Zinc, total recoverable | 30-day average | ≤ 231 ug/L | Apr–Sep | 001 |
| Zinc, total recoverable | 30-day average | ≤ 231 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Zinc, total recoverable | daily maximum | ≤ 234 ug/L | Apr–Sep | 001 |
| Zinc, total recoverable | daily maximum | ≤ 234 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Aluminum, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Cadmium, total recoverable | 30-day average | ≤ .48 ug/L | Apr–Sep | 001 |
| Cadmium, total recoverable | 30-day average | ≤ .48 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Cadmium, total recoverable | daily maximum | ≤ 4.8 ug/L | Apr–Sep | 001 |
| Cadmium, total recoverable | daily maximum | ≤ 4.8 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Lead, total recoverable | 30-day average | ≤ 8.5 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Lead, total recoverable | 30-day average | ≤ 8.5 ug/L | Apr–Sep | 001 |
| Lead, total recoverable | daily maximum | ≤ 223 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Lead, total recoverable | daily maximum | ≤ 223 ug/L | Apr–Sep | 001 |
| Copper, total recoverable | 30-day average | ≤ 18.1 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Copper, total recoverable | 30-day average | ≤ 18.1 ug/L | Apr–Sep | 001 |
| Copper, total recoverable | daily maximum | ≤ 37.5 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Copper, total recoverable | daily maximum | ≤ 37.5 ug/L | Apr–Sep | 001 |
| Floating solids, waste or visible foam-visual | daily maximum | = 0 abst=0;prst=1 | Apr–Sep | 001 |
| Floating solids, waste or visible foam-visual | daily maximum | = 0 abst=0;prst=1 | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Selenate, Total Recoverable | daily maximum | ≤ 12.8 ug/L | Apr–Sep | 001 |
| Selenate, Total Recoverable | daily maximum | ≤ 12.8 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Mercury, total recoverable | 30-day average | ≤ .77 ug/L | Apr–Sep | 001 |
| Mercury, total recoverable | 30-day average | ≤ .77 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Mercury, total recoverable | daily maximum | ≤ 1.4 ug/L | Apr–Sep | 001 |
| Mercury, total recoverable | daily maximum | ≤ 1.4 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Oil and grease visual | daily maximum | = 0 abst=0;prst=1 | Apr–Sep | 001 |
| Oil and grease visual | daily maximum | = 0 abst=0;prst=1 | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Temperature, water deg. fahrenheit | 30-day average | report only (deg F) | Apr–Sep | 002 |
| Temperature, water deg. fahrenheit | 30-day average | report only (deg F) | Jan, Feb, Mar, Oct, Nov, Dec | 002 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | Apr–Sep | 002 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | Jan, Feb, Mar, Oct, Nov, Dec | 002 |
| Flow rate | 30-day average | report only (MGD) | Jan, Feb, Mar, Oct, Nov, Dec | 002 |
| Flow rate | 30-day average | report only (MGD) | Apr–Sep | 002 |
| Flow rate | daily maximum | report only (MGD) | Jan, Feb, Mar, Oct, Nov, Dec | 002 |
| Flow rate | daily maximum | report only (MGD) | Apr–Sep | 002 |
| pH | daily minimum | ≥ 6.5 SU | Apr–Sep | 002 |
| pH | daily minimum | ≥ 6.5 SU | Jan, Feb, Mar, Oct, Nov, Dec | 002 |
| pH | daily maximum | ≤ 9 SU | Apr–Sep | 002 |
| pH | daily maximum | ≤ 9 SU | Jan, Feb, Mar, Oct, Nov, Dec | 002 |
| Solids, total suspended | 30-day average | ≤ 90 mg/L | Apr–Sep | 002 |
| Solids, total suspended | 30-day average | ≤ 90 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 002 |
| Solids, total suspended | daily maximum | ≤ 158 mg/L | Apr–Sep | 002 |
| Solids, total suspended | daily maximum | ≤ 158 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 002 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | all year | 002 |
| Nitrogen, nitrate total [as N] | 30-day average | ≤ 50 mg/L | all year | 002 |
| Nitrogen, nitrate total [as N] | daily maximum | ≤ 88 mg/L | all year | 002 |
| Cyanide, weak acid, dissociable | 30-day average | ≤ 5.2 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 002 |
| Cyanide, weak acid, dissociable | 30-day average | ≤ 5.2 ug/L | Apr–Sep | 002 |
| Cyanide, weak acid, dissociable | daily maximum | ≤ 22 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 002 |
| Cyanide, weak acid, dissociable | daily maximum | ≤ 22 ug/L | Apr–Sep | 002 |
| Hardness, total [as CaCO3] | 30-day average | report only (mg/L) | Jan, Feb, Mar, Oct, Nov, Dec | 002 |
| Hardness, total [as CaCO3] | 30-day average | report only (mg/L) | Apr–Sep | 002 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Oct, Nov, Dec | 002 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | Apr–Sep | 002 |
| Arsenic, total recoverable | 30-day average | ≤ 150 ug/L | all year | 002 |
| Arsenic, total recoverable | daily maximum | ≤ 340 ug/L | all year | 002 |
| Selenium, total recoverable | 30-day average | ≤ 5 ug/L | Apr–Sep | 002 |
| Selenium, total recoverable | 30-day average | ≤ 5 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 002 |
| Zinc, total recoverable | 30-day average | ≤ 256 ug/L | Apr–Sep | 002 |
| Zinc, total recoverable | 30-day average | ≤ 256 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 002 |
| Zinc, total recoverable | daily maximum | ≤ 259 ug/L | Apr–Sep | 002 |
| Zinc, total recoverable | daily maximum | ≤ 259 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 002 |
| Aluminum, total recoverable | 30-day average | report only (ug/L) | all year | 002 |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Cadmium, total recoverable | 30-day average | ≤ .53 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 002 |
| Cadmium, total recoverable | 30-day average | ≤ .53 ug/L | Apr–Sep | 002 |
| Cadmium, total recoverable | daily maximum | ≤ 5.4 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 002 |
| Cadmium, total recoverable | daily maximum | ≤ 5.4 ug/L | Apr–Sep | 002 |
| Lead, total recoverable | 30-day average | ≤ 10 ug/L | Apr–Sep | 002 |
| Lead, total recoverable | 30-day average | ≤ 10 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 002 |
| Lead, total recoverable | daily maximum | ≤ 260 ug/L | Apr–Sep | 002 |
| Lead, total recoverable | daily maximum | ≤ 260 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 002 |
| Copper, total recoverable | 30-day average | ≤ 20 ug/L | Apr–Sep | 002 |
| Copper, total recoverable | 30-day average | ≤ 20 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 002 |
| Copper, total recoverable | daily maximum | ≤ 42 ug/L | Apr–Sep | 002 |
| Copper, total recoverable | daily maximum | ≤ 42 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 002 |
| Floating solids, waste or visible foam-visual | daily maximum | = 0 abst=0;prst=1 | Jan, Feb, Mar, Oct, Nov, Dec | 002 |
| Floating solids, waste or visible foam-visual | daily maximum | = 0 abst=0;prst=1 | Apr–Sep | 002 |
| Selenate, Total Recoverable | daily maximum | ≤ 12.8 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 002 |
| Selenate, Total Recoverable | daily maximum | ≤ 12.8 ug/L | Apr–Sep | 002 |
| Mercury, total recoverable | 30-day average | ≤ .77 ug/L | Apr–Sep | 002 |
| Mercury, total recoverable | 30-day average | ≤ .77 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 002 |
| Mercury, total recoverable | daily maximum | ≤ 1.4 ug/L | Apr–Sep | 002 |
| Mercury, total recoverable | daily maximum | ≤ 1.4 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 002 |
| Oil and grease visual | daily maximum | = 0 abst=0;prst=1 | Jan, Feb, Mar, Oct, Nov, Dec | 002 |
| Oil and grease visual | daily maximum | = 0 abst=0;prst=1 | Apr–Sep | 002 |
| Temperature, water deg. fahrenheit | 30-day average | report only (deg F) | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Temperature, water deg. fahrenheit | 30-day average | report only (deg F) | Apr–Sep | 004 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | Apr–Sep | 004 |
| Flow rate | 30-day average | report only (MGD) | Apr–Sep | 004 |
| Flow rate | 30-day average | report only (MGD) | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Flow rate | daily maximum | report only (MGD) | Apr–Sep | 004 |
| Flow rate | daily maximum | report only (MGD) | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| pH | daily minimum | ≥ 6.5 SU | Apr–Sep | 004 |
| pH | daily minimum | ≥ 6.5 SU | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| pH | daily maximum | ≤ 9 SU | Apr–Sep | 004 |
| pH | daily maximum | ≤ 9 SU | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Solids, total suspended | 30-day average | ≤ 90 mg/L | Apr–Sep | 004 |
| Solids, total suspended | 30-day average | ≤ 90 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Solids, total suspended | daily maximum | ≤ 158 mg/L | Apr–Sep | 004 |
| Solids, total suspended | daily maximum | ≤ 158 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | all year | 004 |
| Nitrogen, nitrate total [as N] | 30-day average | ≤ 50 mg/L | all year | 004 |
| Nitrogen, nitrate total [as N] | daily maximum | ≤ 88 mg/L | all year | 004 |
| Cyanide, weak acid, dissociable | 30-day average | ≤ 5.2 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Cyanide, weak acid, dissociable | 30-day average | ≤ 5.2 ug/L | Apr–Sep | 004 |
| Cyanide, weak acid, dissociable | daily maximum | ≤ 22 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Cyanide, weak acid, dissociable | daily maximum | ≤ 22 ug/L | Apr–Sep | 004 |
| Hardness, total [as CaCO3] | 30-day average | report only (mg/L) | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Hardness, total [as CaCO3] | 30-day average | report only (mg/L) | Apr–Sep | 004 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | Apr–Sep | 004 |
| Arsenic, total recoverable | 30-day average | ≤ 150 ug/L | all year | 004 |
| Arsenic, total recoverable | daily maximum | ≤ 340 ug/L | all year | 004 |
| Selenium, total recoverable | 30-day average | ≤ 5 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Selenium, total recoverable | 30-day average | ≤ 5 ug/L | Apr–Sep | 004 |
| Silver total recoverable | daily maximum | report only (ug/L) | all year | 004 |
| Zinc, total recoverable | 30-day average | ≤ 121 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Zinc, total recoverable | 30-day average | ≤ 121 ug/L | Apr–Sep | 004 |
| Zinc, total recoverable | daily maximum | ≤ 121 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Zinc, total recoverable | daily maximum | ≤ 121 ug/L | Apr–Sep | 004 |
| Aluminum, total recoverable | 30-day average | report only (ug/L) | all year | 004 |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | all year | 004 |
| Cadmium, total recoverable | 30-day average | ≤ .27 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Cadmium, total recoverable | 30-day average | ≤ .27 ug/L | Apr–Sep | 004 |
| Cadmium, total recoverable | daily maximum | ≤ 2.2 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Cadmium, total recoverable | daily maximum | ≤ 2.2 ug/L | Apr–Sep | 004 |
| Lead, total recoverable | 30-day average | ≤ 3.2 ug/L | Apr–Sep | 004 |
| Lead, total recoverable | 30-day average | ≤ 3.2 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Lead, total recoverable | daily maximum | ≤ 82.7 ug/L | Apr–Sep | 004 |
| Lead, total recoverable | daily maximum | ≤ 82.7 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Copper, total recoverable | 30-day average | ≤ 9.4 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Copper, total recoverable | 30-day average | ≤ 9.4 ug/L | Apr–Sep | 004 |
| Copper, total recoverable | daily maximum | ≤ 18 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Copper, total recoverable | daily maximum | ≤ 18 ug/L | Apr–Sep | 004 |
| Chromium, trivalent total recoverable | 30-day average | report only (ug/L) | all year | 004 |
| Chromium, trivalent total recoverable | daily maximum | report only (ug/L) | all year | 004 |
| Floating solids, waste or visible foam-visual | daily maximum | = 0 abst=0;prst=1 | Apr–Sep | 004 |
| Floating solids, waste or visible foam-visual | daily maximum | = 0 abst=0;prst=1 | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Selenate, Total Recoverable | daily maximum | ≤ 12.8 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Selenate, Total Recoverable | daily maximum | ≤ 12.8 ug/L | Apr–Sep | 004 |
| Mercury, total recoverable | 30-day average | ≤ .77 ug/L | Apr–Sep | 004 |
| Mercury, total recoverable | 30-day average | ≤ .77 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Mercury, total recoverable | daily maximum | ≤ 1.4 ug/L | Apr–Sep | 004 |
| Mercury, total recoverable | daily maximum | ≤ 1.4 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Chromium, hexavalent tot recoverable | 30-day average | report only (ug/L) | all year | 004 |
| Chromium, hexavalent tot recoverable | daily maximum | report only (ug/L) | all year | 004 |
| Oil and grease visual | daily maximum | = 0 abst=0;prst=1 | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Oil and grease visual | daily maximum | = 0 abst=0;prst=1 | Apr–Sep | 004 |
| Temperature, water deg. fahrenheit | 30-day average | report only (deg F) | Jan, Feb, Mar, Oct, Nov, Dec | 006 |
| Temperature, water deg. fahrenheit | 30-day average | report only (deg F) | Apr–Sep | 006 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | Jan, Feb, Mar, Oct, Nov, Dec | 006 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | Apr–Sep | 006 |
| Flow rate | 30-day average | report only (MGD) | Apr–Sep | 006 |
| Flow rate | 30-day average | report only (MGD) | Jan, Feb, Mar, Oct, Nov, Dec | 006 |
| Flow rate | daily maximum | report only (MGD) | Apr–Sep | 006 |
| Flow rate | daily maximum | report only (MGD) | Jan, Feb, Mar, Oct, Nov, Dec | 006 |
| pH | daily minimum | ≥ 6 SU | Apr–Sep | 006 |
| pH | daily minimum | ≥ 6 SU | Jan, Feb, Mar, Oct, Nov, Dec | 006 |
| pH | daily maximum | ≤ 9 SU | Apr–Sep | 006 |
| pH | daily maximum | ≤ 9 SU | Jan, Feb, Mar, Oct, Nov, Dec | 006 |
| Solids, total suspended | 30-day average | ≤ 20 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 006 |
| Solids, total suspended | 30-day average | ≤ 20 mg/L | Apr–Sep | 006 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 006 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | Apr–Sep | 006 |
| Cyanide, weak acid, dissociable | 30-day average | ≤ 5.2 ug/L | Apr–Sep | 006 |
| Cyanide, weak acid, dissociable | 30-day average | ≤ 5.2 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 006 |
| Cyanide, weak acid, dissociable | daily maximum | ≤ 22 ug/L | Apr–Sep | 006 |
| Cyanide, weak acid, dissociable | daily maximum | ≤ 22 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 006 |
| Hardness, total [as CaCO3] | 30-day average | report only (mg/L) | Jan, Feb, Mar, Oct, Nov, Dec | 006 |
| Hardness, total [as CaCO3] | 30-day average | report only (mg/L) | Apr–Sep | 006 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Oct, Nov, Dec | 006 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | Apr–Sep | 006 |
| Selenium, total recoverable | 30-day average | ≤ 5 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 006 |
| Selenium, total recoverable | 30-day average | ≤ 5 ug/L | Apr–Sep | 006 |
| Zinc, total recoverable | 30-day average | ≤ 750 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 006 |
| Zinc, total recoverable | 30-day average | ≤ 750 ug/L | Apr–Sep | 006 |
| Zinc, total recoverable | daily maximum | ≤ 1500 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 006 |
| Zinc, total recoverable | daily maximum | ≤ 1500 ug/L | Apr–Sep | 006 |
| Cadmium, total recoverable | 30-day average | ≤ 50 ug/L | Apr–Sep | 006 |
| Cadmium, total recoverable | 30-day average | ≤ 50 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 006 |
| Cadmium, total recoverable | daily maximum | ≤ 100 ug/L | Apr–Sep | 006 |
| Cadmium, total recoverable | daily maximum | ≤ 100 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 006 |
| Lead, total recoverable | 30-day average | ≤ 300 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 006 |
| Lead, total recoverable | 30-day average | ≤ 300 ug/L | Apr–Sep | 006 |
| Lead, total recoverable | daily maximum | ≤ 600 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 006 |
| Lead, total recoverable | daily maximum | ≤ 600 ug/L | Apr–Sep | 006 |
| Copper, total recoverable | 30-day average | ≤ 150 ug/L | Apr–Sep | 006 |
| Copper, total recoverable | 30-day average | ≤ 150 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 006 |
| Copper, total recoverable | daily maximum | ≤ 300 ug/L | Apr–Sep | 006 |
| Copper, total recoverable | daily maximum | ≤ 300 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 006 |
| Floating solids, waste or visible foam-visual | daily maximum | = 0 abst=0;prst=1 | Apr–Sep | 006 |
| Floating solids, waste or visible foam-visual | daily maximum | = 0 abst=0;prst=1 | Jan, Feb, Mar, Oct, Nov, Dec | 006 |
| Selenate, Total Recoverable | daily maximum | ≤ 12.8 ug/L | Apr–Sep | 006 |
| Selenate, Total Recoverable | daily maximum | ≤ 12.8 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 006 |
| Mercury, total recoverable | 30-day average | ≤ 1 ug/L | Apr–Sep | 006 |
| Mercury, total recoverable | 30-day average | ≤ 1 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 006 |
| Mercury, total recoverable | daily maximum | ≤ 2 ug/L | Apr–Sep | 006 |
| Mercury, total recoverable | daily maximum | ≤ 2 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 006 |
| Temperature, water deg. fahrenheit | 30-day average | report only (deg F) | Jan, Feb, Mar, Oct, Nov, Dec | 010 |
| Temperature, water deg. fahrenheit | 30-day average | report only (deg F) | Apr–Sep | 010 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | Jan, Feb, Mar, Oct, Nov, Dec | 010 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | Apr–Sep | 010 |
| Flow rate | 30-day average | report only (MGD) | Jan, Feb, Mar, Oct, Nov, Dec | 010 |
| Flow rate | 30-day average | report only (MGD) | Apr–Sep | 010 |
| Flow rate | daily maximum | report only (MGD) | Jan, Feb, Mar, Oct, Nov, Dec | 010 |
| Flow rate | daily maximum | report only (MGD) | Apr–Sep | 010 |
| pH | daily minimum | ≥ 6.5 SU | Jan, Feb, Mar, Oct, Nov, Dec | 010 |
| pH | daily minimum | ≥ 6.5 SU | Apr–Sep | 010 |
| pH | daily maximum | ≤ 9 SU | Jan, Feb, Mar, Oct, Nov, Dec | 010 |
| pH | daily maximum | ≤ 9 SU | Apr–Sep | 010 |
| Solids, total suspended | 30-day average | ≤ 90 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 010 |
| Solids, total suspended | 30-day average | ≤ 90 mg/L | Apr–Sep | 010 |
| Solids, total suspended | daily maximum | ≤ 158 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 010 |
| Solids, total suspended | daily maximum | ≤ 158 mg/L | Apr–Sep | 010 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | all year | 010 |
| Nitrogen, nitrate total [as N] | 30-day average | ≤ 50 mg/L | all year | 010 |
| Nitrogen, nitrate total [as N] | daily maximum | ≤ 88 mg/L | all year | 010 |
| Cyanide, weak acid, dissociable | 30-day average | ≤ 5.2 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 010 |
| Cyanide, weak acid, dissociable | 30-day average | ≤ 5.2 ug/L | Apr–Sep | 010 |
| Cyanide, weak acid, dissociable | daily maximum | ≤ 22 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 010 |
| Cyanide, weak acid, dissociable | daily maximum | ≤ 22 ug/L | Apr–Sep | 010 |
| Hardness, total [as CaCO3] | 30-day average | report only (mg/L) | Apr–Sep | 010 |
| Hardness, total [as CaCO3] | 30-day average | report only (mg/L) | Jan, Feb, Mar, Oct, Nov, Dec | 010 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | Apr–Sep | 010 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Oct, Nov, Dec | 010 |
| Arsenic, total recoverable | 30-day average | ≤ 150 ug/L | all year | 010 |
| Arsenic, total recoverable | daily maximum | ≤ 340 ug/L | all year | 010 |
| Selenium, total recoverable | 30-day average | ≤ 5 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 010 |
| Selenium, total recoverable | 30-day average | ≤ 5 ug/L | Apr–Sep | 010 |
| Silver total recoverable | daily maximum | report only (ug/L) | all year | 010 |
| Zinc, total recoverable | 30-day average | ≤ 121 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 010 |
| Zinc, total recoverable | 30-day average | ≤ 121 ug/L | Apr–Sep | 010 |
| Zinc, total recoverable | daily maximum | ≤ 121 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 010 |
| Zinc, total recoverable | daily maximum | ≤ 121 ug/L | Apr–Sep | 010 |
| Aluminum, total recoverable | 30-day average | report only (ug/L) | all year | 010 |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | all year | 010 |
| Cadmium, total recoverable | 30-day average | ≤ .27 ug/L | Apr–Sep | 010 |
| Cadmium, total recoverable | 30-day average | ≤ .27 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 010 |
| Cadmium, total recoverable | daily maximum | ≤ 2.2 ug/L | Apr–Sep | 010 |
| Cadmium, total recoverable | daily maximum | ≤ 2.2 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 010 |
| Lead, total recoverable | 30-day average | ≤ 3.2 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 010 |
| Lead, total recoverable | 30-day average | ≤ 3.2 ug/L | Apr–Sep | 010 |
| Lead, total recoverable | daily maximum | ≤ 82.7 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 010 |
| Lead, total recoverable | daily maximum | ≤ 82.7 ug/L | Apr–Sep | 010 |
| Copper, total recoverable | 30-day average | ≤ 9.4 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 010 |
| Copper, total recoverable | 30-day average | ≤ 9.4 ug/L | Apr–Sep | 010 |
| Copper, total recoverable | daily maximum | ≤ 18 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 010 |
| Copper, total recoverable | daily maximum | ≤ 18 ug/L | Apr–Sep | 010 |
| Chromium, trivalent total recoverable | 30-day average | report only (ug/L) | all year | 010 |
| Chromium, trivalent total recoverable | daily maximum | report only (ug/L) | all year | 010 |
| Floating solids, waste or visible foam-visual | daily maximum | = 0 abst=0;prst=1 | Apr–Sep | 010 |
| Floating solids, waste or visible foam-visual | daily maximum | = 0 abst=0;prst=1 | Jan, Feb, Mar, Oct, Nov, Dec | 010 |
| Selenate, Total Recoverable | daily maximum | ≤ 12.8 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 010 |
| Selenate, Total Recoverable | daily maximum | ≤ 12.8 ug/L | Apr–Sep | 010 |
| Mercury, total recoverable | 30-day average | ≤ .77 ug/L | Apr–Sep | 010 |
| Mercury, total recoverable | 30-day average | ≤ .77 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 010 |
| Mercury, total recoverable | daily maximum | ≤ 1.4 ug/L | Apr–Sep | 010 |
| Mercury, total recoverable | daily maximum | ≤ 1.4 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 010 |
| Chromium, hexavalent tot recoverable | 30-day average | report only (ug/L) | all year | 010 |
| Chromium, hexavalent tot recoverable | daily maximum | report only (ug/L) | all year | 010 |
| Oil and grease visual | daily maximum | = 0 abst=0;prst=1 | Apr–Sep | 010 |
| Oil and grease visual | daily maximum | = 0 abst=0;prst=1 | Jan, Feb, Mar, Oct, Nov, Dec | 010 |
| Temperature, water deg. fahrenheit | 30-day average | report only (deg F) | Jan, Feb, Mar, Oct, Nov, Dec | 011 |
| Temperature, water deg. fahrenheit | 30-day average | report only (deg F) | Apr–Sep | 011 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | Jan, Feb, Mar, Oct, Nov, Dec | 011 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | Apr–Sep | 011 |
| Flow rate | 30-day average | report only (MGD) | Jan, Feb, Mar, Oct, Nov, Dec | 011 |
| Flow rate | 30-day average | report only (MGD) | Apr–Sep | 011 |
| Flow rate | daily maximum | report only (MGD) | Jan, Feb, Mar, Oct, Nov, Dec | 011 |
| Flow rate | daily maximum | report only (MGD) | Apr–Sep | 011 |
| pH | daily minimum | ≥ 6.5 SU | Jan, Feb, Mar, Oct, Nov, Dec | 011 |
| pH | daily minimum | ≥ 6.5 SU | Apr–Sep | 011 |
| pH | daily maximum | ≤ 9 SU | Jan, Feb, Mar, Oct, Nov, Dec | 011 |
| pH | daily maximum | ≤ 9 SU | Apr–Sep | 011 |
| Solids, total suspended | 30-day average | ≤ 90 mg/L | Apr–Sep | 011 |
| Solids, total suspended | 30-day average | ≤ 90 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 011 |
| Solids, total suspended | daily maximum | ≤ 158 mg/L | Apr–Sep | 011 |
| Solids, total suspended | daily maximum | ≤ 158 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 011 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | all year | 011 |
| Nitrogen, nitrate total [as N] | 30-day average | ≤ 50 mg/L | all year | 011 |
| Nitrogen, nitrate total [as N] | daily maximum | ≤ 88 mg/L | all year | 011 |
| Cyanide, weak acid, dissociable | 30-day average | ≤ 5.2 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 011 |
| Cyanide, weak acid, dissociable | 30-day average | ≤ 5.2 ug/L | Apr–Sep | 011 |
| Cyanide, weak acid, dissociable | daily maximum | ≤ 22 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 011 |
| Cyanide, weak acid, dissociable | daily maximum | ≤ 22 ug/L | Apr–Sep | 011 |
| Hardness, total [as CaCO3] | 30-day average | report only (mg/L) | Apr–Sep | 011 |
| Hardness, total [as CaCO3] | 30-day average | report only (mg/L) | Jan, Feb, Mar, Oct, Nov, Dec | 011 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | Apr–Sep | 011 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Oct, Nov, Dec | 011 |
| Arsenic, total recoverable | 30-day average | ≤ 150 ug/L | all year | 011 |
| Arsenic, total recoverable | daily maximum | ≤ 340 ug/L | all year | 011 |
| Selenium, total recoverable | 30-day average | ≤ 5 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 011 |
| Selenium, total recoverable | 30-day average | ≤ 5 ug/L | Apr–Sep | 011 |
| Silver total recoverable | daily maximum | report only (ug/L) | all year | 011 |
| Zinc, total recoverable | 30-day average | ≤ 121 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 011 |
| Zinc, total recoverable | 30-day average | ≤ 121 ug/L | Apr–Sep | 011 |
| Zinc, total recoverable | daily maximum | ≤ 121 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 011 |
| Zinc, total recoverable | daily maximum | ≤ 121 ug/L | Apr–Sep | 011 |
| Aluminum, total recoverable | 30-day average | report only (ug/L) | all year | 011 |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | all year | 011 |
| Cadmium, total recoverable | 30-day average | ≤ .27 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 011 |
| Cadmium, total recoverable | 30-day average | ≤ .27 ug/L | Apr–Sep | 011 |
| Cadmium, total recoverable | daily maximum | ≤ 2.2 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 011 |
| Cadmium, total recoverable | daily maximum | ≤ 2.2 ug/L | Apr–Sep | 011 |
| Lead, total recoverable | 30-day average | ≤ 3.2 ug/L | Apr–Sep | 011 |
| Lead, total recoverable | 30-day average | ≤ 3.2 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 011 |
| Lead, total recoverable | daily maximum | ≤ 82.7 ug/L | Apr–Sep | 011 |
| Lead, total recoverable | daily maximum | ≤ 82.7 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 011 |
| Copper, total recoverable | 30-day average | ≤ 9.4 ug/L | Apr–Sep | 011 |
| Copper, total recoverable | 30-day average | ≤ 9.4 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 011 |
| Copper, total recoverable | daily maximum | ≤ 18 ug/L | Apr–Sep | 011 |
| Copper, total recoverable | daily maximum | ≤ 18 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 011 |
| Chromium, trivalent total recoverable | 30-day average | report only (ug/L) | all year | 011 |
| Chromium, trivalent total recoverable | daily maximum | report only (ug/L) | all year | 011 |
| Floating solids, waste or visible foam-visual | daily maximum | = 0 abst=0;prst=1 | Apr–Sep | 011 |
| Floating solids, waste or visible foam-visual | daily maximum | = 0 abst=0;prst=1 | Jan, Feb, Mar, Oct, Nov, Dec | 011 |
| Selenate, Total Recoverable | daily maximum | ≤ 12.8 ug/L | Apr–Sep | 011 |
| Selenate, Total Recoverable | daily maximum | ≤ 12.8 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 011 |
| Mercury, total recoverable | 30-day average | ≤ .77 ug/L | Apr–Sep | 011 |
| Mercury, total recoverable | 30-day average | ≤ .77 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 011 |
| Mercury, total recoverable | daily maximum | ≤ 1.4 ug/L | Apr–Sep | 011 |
| Mercury, total recoverable | daily maximum | ≤ 1.4 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 011 |
| Chromium, hexavalent tot recoverable | 30-day average | report only (ug/L) | all year | 011 |
| Chromium, hexavalent tot recoverable | daily maximum | report only (ug/L) | all year | 011 |
| Oil and grease visual | daily maximum | = 0 abst=0;prst=1 | Jan, Feb, Mar, Oct, Nov, Dec | 011 |
| Oil and grease visual | daily maximum | = 0 abst=0;prst=1 | Apr–Sep | 011 |
Cited limits by parameter: South Dakota's rules and the federal ones.
Same industry: the 5 Metal Mining permits in South Dakota.
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Your permit document is the final word. As JSON: /api/v1/permits/SD0025852 · MCP: https://passage-data.com/mcp