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Lead And Zinc Ores, major discharger, Annapolis, Missouri. NPDES permit MO0001121 expired Sep 30, 2026; its limits still apply. Last 12 months: over a limit 3 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| July 2026 | Cadmium, total recoverable, daily maximum | 18.8 | ≤ 11.7 ug/L | 61% |
| July 2026 | Copper, total recoverable, daily maximum | 49.9 | ≤ 32.2 ug/L | 55% |
| July 2026 | Lead, total recoverable, daily maximum | 1010 | ≤ 373 ug/L | 171% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 45 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 001 |
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 003 |
| pH | maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 003 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 003 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 003 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | 003 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | all year | 003 |
| Sulfate, total [as SO4] | monthly average | report only (mg/L) | all year | 003 |
| Selenium, total recoverable | daily maximum | ≤ 8.8 ug/L | all year | 003 |
| Selenium, total recoverable | monthly average | ≤ 2.9 ug/L | all year | 003 |
| Thallium, total recoverable | daily maximum | ≤ 14.1 ug/L | all year | 003 |
| Thallium, total recoverable | monthly average | ≤ 6.3 ug/L | all year | 003 |
| Zinc, total recoverable | daily maximum | ≤ 405.9 ug/L | all year | 003 |
| Zinc, total recoverable | monthly average | ≤ 202.3 ug/L | all year | 003 |
| Cadmium, total recoverable | daily maximum | ≤ 2.75 ug/L | all year | 003 |
| Cadmium, total recoverable | monthly average | ≤ 1 ug/L | all year | 003 |
| Lead, total recoverable | daily maximum | ≤ 20.8 ug/L | all year | 003 |
| Lead, total recoverable | monthly average | ≤ 10.4 ug/L | all year | 003 |
| Copper, total recoverable | daily maximum | ≤ 32.2 ug/L | all year | 003 |
| Copper, total recoverable | monthly average | ≤ 10.5 ug/L | all year | 003 |
| Chloride | daily maximum | report only (mg/L) | all year | 003 |
| Chloride | monthly average | report only (mg/L) | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 003 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 003 |
| Chlorine, total residual | daily maximum | ≤ 18.8 ug/L | Apr–Dec | 003 |
| Chlorine, total residual | monthly average | ≤ 6 ug/L | Apr–Dec | 003 |
| E. coli | daily maximum | ≤ 630 #/100mL | Apr–Dec | 003 |
| E. coli | 30-day geometric mean | ≤ 126 #/100mL | Apr–Dec | 003 |
| Toxicity [acute], Ceriodaphnia dubia | value | ≤ .3 toxic | all year | 003 |
| Toxicity [chronic], Ceriodaphnia dubia | value | ≤ 1.7 toxic | all year | 003 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | value | ≤ .3 toxic | all year | 003 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | value | ≤ 1.7 toxic | all year | 003 |
| Mercury, total recoverable | daily maximum | ≤ 2 ug/kg | all year | 003 |
| Mercury, total recoverable | monthly average | ≤ 1 ug/kg | all year | 003 |
| Chlorides + Sulfates | daily maximum | ≤ 1000 mg/L | all year | 003 |
| Sulfate [as S] | daily maximum | report only (mg/L) | all year | 006 |
| 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 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 006 |
| Selenium, total recoverable | daily maximum | report only (ug/L) | all year | 006 |
| Thallium, total recoverable | daily maximum | report only (ug/L) | all year | 006 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 006 |
| Cadmium, total recoverable | daily maximum | ≤ 11.7 ug/L | all year | 006 |
| Lead, total recoverable | daily maximum | ≤ 373 ug/L | all year | 006 |
| Copper, total recoverable | daily maximum | ≤ 32.2 ug/L | all year | 006 |
| Chloride | daily maximum | report only (mg/L) | all year | 006 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 006 |
| Chlorine, total residual | daily maximum | ≤ 19 ug/L | all year | 006 |
| Mercury, total recoverable | daily maximum | report only (ug/L) | all year | 006 |
| Precipitation volume | daily maximum | report only (in/d) | all year | 006 |
| Chlorides + Sulfates | daily maximum | report only (mg/L) | all year | 006 |
Cited limits by parameter: Missouri's rules and the federal ones.
Same industry: the 12 Metal Mining permits in Missouri.
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