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Local And Suburban Transit, Sterling, Virginia. NPDES permit VA0093017 expired Jul 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 | report only (SU) | all year | 003 |
| pH | maximum | report only (SU) | all year | 003 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 003 |
| Petrol hydrocarbons, total recoverable | daily maximum | report only (mg/L) | all year | 003 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 003 |
| Flow, in conduit or thru treatment plant | maximum | report only (MGD) | all year | 003 |
| pH | minimum | report only (SU) | all year | 004 |
| pH | maximum | report only (SU) | all year | 004 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 004 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 004 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 004 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 004 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 004 |
| Petrol hydrocarbons, total recoverable | daily maximum | report only (mg/L) | all year | 004 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 004 |
| Flow, in conduit or thru treatment plant | maximum | report only (MGD) | all year | 004 |
| pH | minimum | report only (SU) | all year | 005 |
| pH | maximum | report only (SU) | all year | 005 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 005 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 005 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 005 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 005 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 005 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 005 |
| Petrol hydrocarbons, total recoverable | daily maximum | report only (mg/L) | all year | 005 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 005 |
| Flow, in conduit or thru treatment plant | maximum | report only (MGD) | all year | 005 |
| pH | minimum | report only (SU) | all year | 006 |
| pH | maximum | report only (SU) | all year | 006 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 006 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 006 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 006 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 006 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 006 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 006 |
| Petrol hydrocarbons, total recoverable | daily maximum | report only (mg/L) | all year | 006 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 006 |
| Flow, in conduit or thru treatment plant | maximum | report only (MGD) | all year | 006 |
| pH | minimum | report only (SU) | all year | 007 |
| pH | maximum | report only (SU) | all year | 007 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 007 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 007 |
| Nitrogen, ammonia total [as N] | 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 |
| Petrol hydrocarbons, total recoverable | daily maximum | report only (mg/L) | all year | 007 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 007 |
| Flow, in conduit or thru treatment plant | maximum | report only (MGD) | all year | 007 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 013 |
| Flow, in conduit or thru treatment plant | maximum | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 013 |
| 1,2-Propanediol | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 013 |
| 1,2-Propanediol | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 013 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 014 |
| Flow, in conduit or thru treatment plant | maximum | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 014 |
| 1,2-Propanediol | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 014 |
| 1,2-Propanediol | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 014 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 015 |
| Flow, in conduit or thru treatment plant | maximum | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 015 |
| 1,2-Propanediol | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 015 |
| 1,2-Propanediol | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 015 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 016 |
| Flow, in conduit or thru treatment plant | maximum | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 016 |
| 1,2-Propanediol | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 016 |
| 1,2-Propanediol | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 016 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 017 |
| Flow, in conduit or thru treatment plant | maximum | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 017 |
| 1,2-Propanediol | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 017 |
| 1,2-Propanediol | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 017 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 018 |
| Flow, in conduit or thru treatment plant | maximum | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 018 |
| 1,2-Propanediol | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 018 |
| 1,2-Propanediol | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 018 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 019 |
| Flow, in conduit or thru treatment plant | maximum | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 019 |
| 1,2-Propanediol | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 019 |
| 1,2-Propanediol | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 019 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 020 |
| Flow, in conduit or thru treatment plant | maximum | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 020 |
| 1,2-Propanediol | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 020 |
| 1,2-Propanediol | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 020 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 021 |
| Flow, in conduit or thru treatment plant | maximum | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 021 |
| 1,2-Propanediol | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 021 |
| 1,2-Propanediol | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 021 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 022 |
| Flow, in conduit or thru treatment plant | maximum | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 022 |
| 1,2-Propanediol | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 022 |
| 1,2-Propanediol | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 022 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 023 |
| Flow, in conduit or thru treatment plant | maximum | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 023 |
| 1,2-Propanediol | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 023 |
| 1,2-Propanediol | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 023 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 024 |
| Flow, in conduit or thru treatment plant | maximum | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 024 |
| 1,2-Propanediol | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 024 |
| 1,2-Propanediol | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 024 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 025 |
| Flow, in conduit or thru treatment plant | maximum | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 025 |
| 1,2-Propanediol | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 025 |
| 1,2-Propanediol | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 025 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 026 |
| Flow, in conduit or thru treatment plant | maximum | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 026 |
| 1,2-Propanediol | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 026 |
| 1,2-Propanediol | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 026 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 027 |
| Flow, in conduit or thru treatment plant | maximum | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 027 |
| 1,2-Propanediol | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 027 |
| 1,2-Propanediol | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 027 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 903 |
| Flow, in conduit or thru treatment plant | maximum | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 903 |
| 1,2-Propanediol | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 903 |
| 1,2-Propanediol | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 903 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 904 |
| Flow, in conduit or thru treatment plant | maximum | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 904 |
| 1,2-Propanediol | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 904 |
| 1,2-Propanediol | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 904 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 905 |
| Flow, in conduit or thru treatment plant | maximum | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 905 |
| 1,2-Propanediol | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 905 |
| 1,2-Propanediol | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 905 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 906 |
| Flow, in conduit or thru treatment plant | maximum | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 906 |
| 1,2-Propanediol | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 906 |
| 1,2-Propanediol | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 906 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 907 |
| Flow, in conduit or thru treatment plant | maximum | report only (MGD) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 907 |
| 1,2-Propanediol | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 907 |
| 1,2-Propanediol | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 907 |
Cited limits by parameter: Virginia's rules and the federal ones.
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