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Nonresidential Building Operators, St. Louis, Missouri. NPDES permit MO0004782 expired Mar 31, 2026; 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 | 007 |
| pH | maximum | ≤ 9 SU | all year | 007 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 007 |
| Solids, settleable | daily maximum | report only (mL/L) | all year | 007 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | report only (mg/L) | all year | 007 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 007 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 007 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 007 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | all year | 007 |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | 007 |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | all year | 007 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 007 |
| Chloride | daily maximum | report only (mg/L) | all year | 007 |
| Chemical oxygen demand [COD] | daily maximum | report only (mg/L) | all year | 007 |
| Storm water flow | daily maximum | report only (MGD) | all year | 007 |
| Chlorides + Sulfates | daily maximum | report only (mg/L) | all year | 007 |
| Sulfate [as S] | daily maximum | report only (mg/L) | all year | 010 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | report only (mg/L) | all year | 010 |
| pH | minimum | ≥ 6 SU | all year | 010 |
| pH | maximum | ≤ 9 SU | all year | 010 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 010 |
| Solids, settleable | daily maximum | report only (mL/L) | all year | 010 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | report only (mg/L) | all year | 010 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 010 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 010 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 010 |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | 010 |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | all year | 010 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 010 |
| Chloride | daily maximum | report only (mg/L) | all year | 010 |
| Storm water flow | daily maximum | report only (MGD) | all year | 010 |
| Chlorides + Sulfates | daily maximum | report only (mg/L) | all year | 010 |
| Sulfate [as S] | daily maximum | report only (mg/L) | all year | 012 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | report only (mg/L) | all year | 012 |
| pH | minimum | ≥ 6 SU | all year | 012 |
| pH | maximum | ≤ 9 SU | all year | 012 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 012 |
| Solids, settleable | daily maximum | report only (mL/L) | all year | 012 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | report only (mg/L) | all year | 012 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 012 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 012 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 012 |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | 012 |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | all year | 012 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 012 |
| Chloride | daily maximum | report only (mg/L) | all year | 012 |
| Storm water flow | daily maximum | report only (MGD) | all year | 012 |
| Chlorides + Sulfates | daily maximum | report only (mg/L) | all year | 012 |
| Sulfate [as S] | daily maximum | report only (mg/L) | all year | 013 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | report only (mg/L) | all year | 013 |
| pH | minimum | ≥ 6 SU | all year | 013 |
| pH | maximum | ≤ 9 SU | all year | 013 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 013 |
| Solids, settleable | daily maximum | report only (mL/L) | all year | 013 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | report only (mg/L) | all year | 013 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 013 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 013 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 013 |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | 013 |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | all year | 013 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 013 |
| Chloride | daily average | report only (mg/L) | all year | 013 |
| Storm water flow | daily maximum | report only (MGD) | all year | 013 |
| Chlorides + Sulfates | daily maximum | report only (mg/L) | all year | 013 |
| Sulfate [as S] | daily maximum | report only (mg/L) | all year | 014 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | report only (mg/L) | all year | 014 |
| pH | minimum | ≥ 6 SU | all year | 014 |
| pH | maximum | ≤ 9 SU | all year | 014 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 014 |
| Solids, settleable | daily maximum | report only (mL/L) | all year | 014 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | report only (mg/L) | all year | 014 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 014 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 014 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 014 |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | 014 |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | all year | 014 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 014 |
| Chloride | daily maximum | report only (mg/L) | all year | 014 |
| Storm water flow | daily maximum | report only (MGD) | all year | 014 |
| Chlorides + Sulfates | daily maximum | report only (mg/L) | all year | 014 |
| Sulfate [as S] | daily maximum | report only (mg/L) | all year | 015 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | report only (mg/L) | all year | 015 |
| pH | minimum | ≥ 6 SU | all year | 015 |
| pH | maximum | ≤ 9 SU | all year | 015 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 015 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 015 |
| Solids, settleable | daily maximum | report only (mL/L) | all year | 015 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | report only (mg/L) | all year | 015 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 015 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 015 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 015 |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | 015 |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | all year | 015 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 015 |
| Chloride | daily maximum | report only (mg/L) | all year | 015 |
| Storm water flow | daily maximum | report only (MGD) | all year | 015 |
| Chlorides + Sulfates | daily maximum | report only (mg/L) | all year | 015 |
| Sulfate [as S] | daily maximum | report only (mg/L) | all year | 016 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | report only (mg/L) | all year | 016 |
| pH | minimum | ≥ 6 SU | all year | 016 |
| pH | maximum | ≤ 9 SU | all year | 016 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 016 |
| Solids, settleable | daily maximum | report only (mL/L) | all year | 016 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | report only (mg/L) | all year | 016 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 016 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 016 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 016 |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | 016 |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | all year | 016 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 016 |
| Chloride | daily maximum | report only (mg/L) | all year | 016 |
| Storm water flow | daily maximum | report only (MGD) | all year | 016 |
| Chlorides + Sulfates | daily maximum | report only (mg/L) | all year | 016 |
| Sulfate [as S] | daily maximum | report only (mg/L) | all year | 017 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | report only (mg/L) | all year | 017 |
| pH | minimum | ≥ 6 SU | all year | 017 |
| pH | maximum | ≤ 9 SU | all year | 017 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 017 |
| Solids, settleable | daily maximum | report only (mL/L) | all year | 017 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | report only (mg/L) | all year | 017 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 017 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 017 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 017 |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | 017 |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | all year | 017 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 017 |
| Chloride | daily maximum | report only (mg/L) | all year | 017 |
| Storm water flow | daily maximum | report only (MGD) | all year | 017 |
| Chlorides + Sulfates | daily maximum | report only (mg/L) | all year | 017 |
Cited limits by parameter: Missouri's rules and the federal ones.
Same industry: the 188 Real Estate permits in Missouri.
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