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Lead And Zinc Ores, major discharger, Steelville, Missouri. NPDES permit MO0000086, in force until Jun 30, 2030. Last 12 months: over a limit 10 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| July 2026 | Cadmium, total recoverable, daily maximum | 14 | ≤ 2.58 ug/L | 443% |
| July 2026 | Cadmium, total recoverable, monthly average | 3.39 | ≤ 1.01 ug/L | 236% |
| July 2026 | Copper, total recoverable, daily maximum | 190 | ≤ 40.1 ug/L | 374% |
| July 2026 | Copper, total recoverable, monthly average | 52.73 | ≤ 20 ug/L | 164% |
| July 2026 | Lead, total recoverable, daily maximum | 1140 | ≤ 12.4 ug/L | 9094% |
| July 2026 | Lead, total recoverable, monthly average | 244.87 | ≤ 6.2 ug/L | 3850% |
| July 2026 | Solids, total suspended, daily maximum | 64.2 | ≤ 30 mg/L | 114% |
| July 2026 | Solids, total suspended, monthly average | 26.56 | ≤ 20 mg/L | 33% |
| July 2026 | Zinc, total recoverable, daily maximum | 852 | ≤ 227.7 ug/L | 274% |
| July 2026 | Zinc, total recoverable, monthly average | 213.9 | ≤ 113.5 ug/L | 88% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | minimum | ≥ 6.5 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 002 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 002 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | ≤ 15 mg/L | all year | 002 |
| Oil and grease [soxhlet extr.] tot. | monthly average | ≤ 10 mg/L | all year | 002 |
| Zinc, total recoverable | daily maximum | ≤ 227.7 ug/L | all year | 002 |
| Zinc, total recoverable | monthly average | ≤ 113.5 ug/L | all year | 002 |
| Cadmium, total recoverable | daily maximum | ≤ 2.58 ug/L | all year | 002 |
| Cadmium, total recoverable | monthly average | ≤ 1.01 ug/L | all year | 002 |
| Lead, total recoverable | daily maximum | ≤ 12.4 ug/L | all year | 002 |
| Lead, total recoverable | monthly average | ≤ 6.2 ug/L | all year | 002 |
| Copper, total recoverable | daily maximum | ≤ 40.1 ug/L | all year | 002 |
| Copper, total recoverable | monthly average | ≤ 20 ug/L | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | ≤ 1.6 toxic | all year | 002 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | ≤ 1.6 toxic | all year | 002 |
| Mercury, total recoverable | daily maximum | ≤ 2 ug/L | all year | 002 |
| Mercury, total recoverable | monthly average | ≤ 1 ug/L | all year | 002 |
| pH | minimum | ≥ 6.5 SU | all year | 004 |
| pH | maximum | ≤ 9 SU | all year | 004 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 004 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 004 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year | 004 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 004 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 004 |
| Rainfall | daily maximum | report only (in) | all year | 004 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 004 |
| Mercury, total recoverable | daily maximum | report only (ug/L) | all year | 004 |
| pH | minimum | ≥ 6.5 SU | all year | 005 |
| pH | maximum | ≤ 9 SU | all year | 005 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 005 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Rainfall | daily maximum | report only (in) | all year | 005 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 005 |
| Mercury, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| pH | minimum | ≥ 6.5 SU | all year | 006 |
| pH | maximum | ≤ 9 SU | all year | 006 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 006 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 006 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year | 006 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 006 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 006 |
| Rainfall | daily maximum | report only (in) | all year | 006 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 006 |
| Mercury, total recoverable | daily maximum | report only (ug/L) | all year | 006 |
| pH | minimum | ≥ 6.5 SU | all year | 008 |
| pH | maximum | ≤ 9 SU | all year | 008 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 008 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 008 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year | 008 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 008 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 008 |
| Rainfall | daily maximum | report only (in) | all year | 008 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 008 |
| Mercury, total recoverable | daily maximum | report only (ug/L) | all year | 008 |
Cited limits by parameter: Missouri's rules and the federal ones.
Same industry: the 12 Metal Mining permits in Missouri.
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