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Water Supply, Chesterfield, Missouri. NPDES permit MO0003727 expired Mar 31, 2026; its limits still apply. Last 12 months: no values over a limit, 2 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | maximum | ≤ 10.5 SU | all year | 001 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 001 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 001 |
| Solids, total suspended | daily maximum | report only (lb/d) | all year | 001 |
| Solids, total suspended | monthly average | report only (lb/d) | all year | 001 |
| Solids, settleable | daily maximum | report only (mL/L) | all year | 001 |
| Solids, settleable | monthly average | report only (mL/L) | all year | 001 |
| Solids, settleable | daily maximum | report only (mL/L) | all year | 001 |
| Solids, settleable | monthly average | report only (mL/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | 001 |
| Fluoride, total [as F] | monthly average | report only (mg/L) | all year | 001 |
| Iron, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Iron, total recoverable | monthly average | report only (mg/L) | all year | 001 |
| Aluminum, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Aluminum, total recoverable | monthly average | report only (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 |
| Chlorine, total residual | daily maximum | report only (ug/L) | all year | 001 |
| Chlorine, total residual | monthly average | report only (ug/L) | all year | 001 |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | ≤ 3.3 toxic | all year | 001 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | daily maximum | ≤ 3.3 toxic | all year | 001 |
| Outfall observation,visual, y/n response | daily minimum | report only (pass=0;fail=1) | all year | 001 |
| Outfall observation,visual, y/n response | monthly average minimum | report only (pass=0;fail=1) | all year | 001 |
| pH | minimum | ≥ 6 SU | all year | 002 |
| pH | maximum | ≤ 10.5 SU | all year | 002 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 002 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 002 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 002 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 002 |
| Solids, total suspended | daily maximum | report only (lb/d) | all year | 002 |
| Solids, total suspended | monthly average | report only (lb/d) | all year | 002 |
| Solids, settleable | daily maximum | report only (mL/L) | all year | 002 |
| Solids, settleable | monthly average | report only (mL/L) | all year | 002 |
| Solids, settleable | daily maximum | report only (mL/L) | all year | 002 |
| Solids, settleable | monthly average | report only (mL/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | 002 |
| Fluoride, total [as F] | monthly average | report only (mg/L) | all year | 002 |
| Iron, total recoverable | daily maximum | report only (mg/L) | all year | 002 |
| Iron, total recoverable | monthly average | report only (mg/L) | all year | 002 |
| Aluminum, total recoverable | daily maximum | report only (mg/L) | all year | 002 |
| Aluminum, total recoverable | monthly average | report only (mg/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 |
| Chlorine, total residual | daily maximum | report only (ug/L) | all year | 002 |
| Chlorine, total residual | monthly average | report only (ug/L) | all year | 002 |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | ≤ 3.3 toxic | all year | 002 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | daily maximum | ≤ 3.3 toxic | all year | 002 |
| Outfall observation,visual, y/n response | daily minimum | report only (pass=0;fail=1) | all year | 002 |
| Outfall observation,visual, y/n response | monthly average minimum | report only (pass=0;fail=1) | all year | 002 |
| pH | minimum | ≥ 6 SU | all year | 003 |
| pH | maximum | ≤ 10.5 SU | all year | 003 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 003 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 003 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 003 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 003 |
| Solids, total suspended | daily maximum | report only (lb/d) | all year | 003 |
| Solids, total suspended | monthly average | report only (lb/d) | all year | 003 |
| Solids, settleable | daily maximum | report only (mL/L) | all year | 003 |
| Solids, settleable | monthly average | report only (mL/L) | all year | 003 |
| Solids, settleable | daily maximum | report only (mL/L) | all year | 003 |
| Solids, settleable | monthly average | report only (mL/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 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | 003 |
| Fluoride, total [as F] | monthly average | report only (mg/L) | all year | 003 |
| Iron, total recoverable | daily maximum | report only (mg/L) | all year | 003 |
| Iron, total recoverable | monthly average | report only (mg/L) | all year | 003 |
| Aluminum, total recoverable | daily maximum | report only (mg/L) | all year | 003 |
| Aluminum, total recoverable | 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 | report only (ug/L) | all year | 003 |
| Chlorine, total residual | monthly average | report only (ug/L) | all year | 003 |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | ≤ 3.3 toxic | all year | 003 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | daily maximum | ≤ 3.3 toxic | all year | 003 |
| Outfall observation,visual, y/n response | daily minimum | report only (pass=0;fail=1) | all year | 003 |
| Outfall observation,visual, y/n response | monthly average minimum | report only (pass=0;fail=1) | all year | 003 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 004 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 004 |
| Solids, total suspended | daily maximum | report only (lb/d) | all year | 004 |
| Solids, total suspended | monthly average | report only (lb/d) | all year | 004 |
| Solids, settleable | daily maximum | report only (mL/L) | all year | 004 |
| Solids, settleable | monthly average | report only (mL/L) | all year | 004 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | 004 |
| Fluoride, total [as F] | monthly average | report only (mg/L) | all year | 004 |
| Iron, total recoverable | daily maximum | report only (mg/L) | all year | 004 |
| Iron, total recoverable | monthly average | report only (mg/L) | all year | 004 |
| Aluminum, total recoverable | daily maximum | report only (mg/L) | all year | 004 |
| Aluminum, total recoverable | monthly average | report only (mg/L) | all year | 004 |
| Copper, total recoverable | daily maximum | report only (mg/L) | all year | 004 |
| Copper, total recoverable | monthly average | report only (mg/L) | all year | 004 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 004 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 004 |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | ≤ 3.3 toxic | all year | 03B |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | daily maximum | ≤ 3.3 toxic | all year | 03B |
Cited limits by parameter: Missouri's rules and the federal ones.
Same industry: the 18 Water Supply permits in Missouri.
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