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Natural Gas Distribution, St. Louis, Missouri. NPDES permit MO0114804 expired Jun 30, 2025; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | minimum | ≥ 6 SU | all year | 004 |
| pH | maximum | ≤ 9 SU | all year | 004 |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | all year | 004 |
| Nitrogen, nitrate total [as N] | monthly average | report only (mg/L) | all year | 004 |
| Benzene | daily maximum | report only (ug/L) | all year | 004 |
| Benzene | monthly average | ≤ 5 ug/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 | value | report only (MGD) | all year | 004 |
| Butane | daily maximum | report only (ug/L) | all year | 004 |
| Butane | monthly average | report only (ug/L) | all year | 004 |
| Proprane, total | daily maximum | report only (ug/L) | all year | 004 |
| Proprane, total | monthly average | report only (ug/L) | all year | 004 |
| Benzene | daily maximum | report only (ug/L) | all year | MW1 |
| Depth to water level ft below landsurface | value | report only (ft) | all year | MW1 |
| Butane | daily maximum | report only (ug/L) | all year | MW1 |
| Proprane, total | daily maximum | report only (ug/L) | all year | MW1 |
| Benzene | daily maximum | report only (ug/L) | all year | MW2 |
| Depth to water level ft below landsurface | value | report only (ft) | all year | MW2 |
| Butane | daily maximum | report only (ug/L) | all year | MW2 |
| Proprane, total | daily maximum | report only (ug/L) | all year | MW2 |
| Benzene | daily maximum | report only (ug/L) | all year | MW3 |
| Depth to water level ft below landsurface | value | report only (ft) | all year | MW3 |
| Butane | daily maximum | report only (ug/L) | all year | MW3 |
| Proprane, total | daily maximum | report only (ug/L) | all year | MW3 |
| Benzene | daily maximum | report only (ug/L) | all year | MW4 |
| Depth to water level ft below landsurface | value | report only (ft) | all year | MW4 |
| Butane | daily maximum | report only (ug/L) | all year | MW4 |
| Proprane, total | daily maximum | report only (ug/L) | all year | MW4 |
| Benzene | daily maximum | report only (ug/L) | all year | MW5 |
| Depth to water level ft below landsurface | value | report only (ft) | all year | MW5 |
| Butane | daily maximum | report only (ug/L) | all year | MW5 |
| Proprane, total | daily maximum | report only (ug/L) | all year | MW5 |
| Benzene | daily maximum | report only (ug/L) | all year | MW6 |
| Depth to water level ft below landsurface | value | report only (ft) | all year | MW6 |
| Butane | daily maximum | report only (ug/L) | all year | MW6 |
| Proprane, total | daily maximum | report only (ug/L) | all year | MW6 |
| Benzene | daily maximum | report only (ug/L) | all year | MW7 |
| Depth to water level ft below landsurface | value | report only (ft) | all year | MW7 |
| Butane | daily maximum | report only (ug/L) | all year | MW7 |
| Proprane, total | daily maximum | report only (ug/L) | all year | MW7 |
Cited limits by parameter: Missouri's rules and the federal ones.
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Your permit document is the final word. As JSON: /api/v1/permits/MO0114804 · MCP: https://passage-data.com/mcp