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Gold Ores, major discharger, Lead, South Dakota. NPDES permit SD0026883, in force until Dec 31, 2028. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | 30-day average | report only (deg C) | Apr–Sep | 001 |
| Temperature, water deg. centigrade | 30-day average | report only (deg C) | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | Apr–Sep | 001 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Flow rate | 30-day average | report only (MGD) | Apr–Sep | 001 |
| Flow rate | 30-day average | report only (MGD) | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Flow rate | daily maximum | report only (MGD) | Apr–Sep | 001 |
| Flow rate | daily maximum | report only (MGD) | Jan, Feb, Mar, Oct, Nov, Dec | 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 | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 53 mg/L | all year | 001 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | Apr–Sep | 001 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Hardness, total [as CaCO3] | daily minimum | report only (mg/L) | Apr–Sep | 001 |
| Hardness, total [as CaCO3] | daily minimum | report only (mg/L) | Jan, Feb, Mar, Oct, Nov, Dec | 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 |
| Sulfate, total [as SO4] | 30-day average | report only (mg/L) | all year | 001 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | all year | 001 |
| Arsenic, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Iron, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Selenium, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Selenium, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Nickel, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Nickel, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Zinc, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 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 | report only (ug/L) | Apr–Sep | 001 |
| Cadmium, total recoverable | 30-day average | report only (ug/L) | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | Apr–Sep | 001 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Lead, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Copper, total recoverable | 30-day average | report only (ug/L) | Apr–Sep | 001 |
| Copper, total recoverable | 30-day average | report only (ug/L) | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Copper, total recoverable | daily maximum | report only (ug/L) | Apr–Sep | 001 |
| Copper, total recoverable | daily maximum | report only (ug/L) | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Floating solids, waste or visible foam-visual | daily maximum | ≤ 0 N=0;Y=1 | Apr–Sep | 001 |
| Floating solids, waste or visible foam-visual | daily maximum | ≤ 0 N=0;Y=1 | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Solids, total dissolved | 30-day average | report only (mg/L) | all year | 001 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 001 |
| Mercury, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Mercury, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | Apr–Sep | 001 |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Temperature, water deg. centigrade | 30-day average | report only (deg C) | Apr–Sep | 004 |
| Temperature, water deg. centigrade | 30-day average | report only (deg C) | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | Apr–Sep | 004 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | Jan, Feb, Mar, Oct, Nov, Dec | 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 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | all year | 004 |
| Oxygen, dissolved [DO] | 30-day average | report only (mg/L) | all year | 004 |
| pH | daily minimum | ≥ 6.5 SU | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| pH | daily minimum | ≥ 6.5 SU | Apr–Sep | 004 |
| pH | daily maximum | ≤ 8.8 SU | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| pH | daily maximum | ≤ 8.8 SU | Apr–Sep | 004 |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year | 004 |
| Solids, total suspended | daily maximum | ≤ 53 mg/L | all year | 004 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | Apr–Sep | 004 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Hardness, total [as CaCO3] | daily minimum | report only (mg/L) | all year | 004 |
| Hardness, total [as CaCO3] | 30-day average | report only (mg/L) | all year | 004 |
| Iron, total recoverable | 30-day average | report only (ug/L) | all year | 004 |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | 004 |
| Selenium, total recoverable | 30-day average | ≤ 5 ug/L | Apr–Sep | 004 |
| Selenium, total recoverable | 30-day average | ≤ 5 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Selenium, total recoverable | daily maximum | ≤ 12.8 ug/L | Apr–Sep | 004 |
| Selenium, total recoverable | daily maximum | ≤ 12.8 ug/L | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Zinc, total recoverable | 30-day average | report only (ug/L) | all year | 004 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 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 |
| Lead, total recoverable | 30-day average | report only (ug/L) | all year | 004 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 004 |
| Copper, total recoverable | 30-day average | report only (ug/L) | all year | 004 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 004 |
| Floating solids, waste or visible foam-visual | daily maximum | ≤ 0 N=0;Y=1 | Apr–Sep | 004 |
| Floating solids, waste or visible foam-visual | daily maximum | ≤ 0 N=0;Y=1 | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Solids, total dissolved | 30-day average | report only (mg/L) | all year | 004 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 004 |
| Mercury, total recoverable | 30-day average | report only (ug/L) | all year | 004 |
| Mercury, total recoverable | daily maximum | report only (ug/L) | all year | 004 |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | Apr–Sep | 004 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | STR |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | STR |
| Flow rate | daily maximum | report only (MGD) | all year | STR |
| Flow rate | daily maximum | report only (MGD) | all year | STR |
| pH | daily minimum | report only (SU) | all year | STR |
| pH | daily minimum | report only (SU) | all year | STR |
| pH | daily maximum | report only (SU) | all year | STR |
| pH | daily maximum | report only (SU) | all year | STR |
| Oil and grease, hexane extr method | daily maximum | report only (mg/L) | all year | STR |
| Oil and grease, hexane extr method | daily maximum | report only (mg/L) | all year | STR |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | all year | STR |
| Hardness, total [as CaCO3] | daily minimum | report only (mg/L) | all year | STR |
| Hardness, total [as CaCO3] | daily minimum | report only (mg/L) | all year | STR |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year | STR |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | STR |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | STR |
| Selenium, total recoverable | daily maximum | report only (ug/L) | all year | STR |
| Selenium, total recoverable | daily maximum | report only (ug/L) | all year | STR |
| Nickel, total recoverable | daily maximum | report only (ug/L) | all year | STR |
| Silver total recoverable | daily maximum | report only (ug/L) | all year | STR |
| Silver total recoverable | daily maximum | report only (ug/L) | all year | STR |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | STR |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | STR |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | all year | STR |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | all year | STR |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year | STR |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year | STR |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | STR |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | STR |
| Chromium, total recoverable | daily maximum | report only (ug/L) | all year | STR |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | STR |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | STR |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | STR |
| Oil and grease visual | daily maximum | report only (N=0;Y=1) | all year | STR |
| Oil and grease visual | daily maximum | report only (N=0;Y=1) | all year | STR |
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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