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Local And Suburban Transit, Boston, Massachusetts. NPDES permit MA0028941 expired Sep 30, 2023; its limits still apply. Last 12 months: no values over a limit, 1 of 20 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Specific conductance | daily maximum | report only (umho/cm) | all year |
| Specific conductance | daily maximum | report only (umho/cm) | May–Oct |
| pH | minimum | ≥ 6.5 SU | all year |
| pH | maximum | ≤ 8.3 SU | all year |
| pH | daily maximum | report only (SU) | all year |
| pH | maximum | report only (SU) | May–Oct |
| Alkalinity, total [as CaCO3] | daily maximum | report only (mg/L) | all year |
| Alkalinity, total [as CaCO3] | daily maximum | report only (mg/L) | May–Oct |
| Solids, total | daily maximum | report only (mg/L) | all year |
| Solids, total | daily maximum | report only (mg/L) | May–Oct |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year |
| Ammonia, unionized | daily maximum | report only (mg/L) | all year |
| Ammonia, unionized | daily maximum | report only (mg/L) | May–Oct |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year |
| Carbon, tot organic [TOC] | daily maximum | report only (mg/L) | May–Oct |
| Carbon, tot organic [TOC] | daily maximum | report only (mg/L) | May–Oct |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | May–Oct |
| Magnesium, total [as Mg] | daily maximum | report only (mg/L) | all year |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year |
| Manganese, total [as Mn] | daily maximum | report only (mg/L) | all year |
| Nickel, total recoverable | daily maximum | report only (mg/L) | May–Oct |
| Nickel, total recoverable | daily maximum | report only (mg/L) | May–Oct |
| Zinc, total recoverable | daily maximum | report only (mg/L) | May–Oct |
| Zinc, total recoverable | daily maximum | report only (mg/L) | May–Oct |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | May–Oct |
| Aluminum, total recoverable | daily maximum | report only (mg/L) | May–Oct |
| Cadmium, total recoverable | daily maximum | report only (mg/L) | all year |
| Cadmium, total recoverable | daily maximum | report only (mg/L) | May–Oct |
| Lead, total recoverable | daily maximum | report only (mg/L) | May–Oct |
| Lead, total recoverable | daily maximum | report only (mg/L) | May–Oct |
| Copper, total recoverable | daily maximum | report only (mg/L) | all year |
| Copper, total recoverable | daily maximum | report only (mg/L) | May–Oct |
| E. coli, thermotol, MF, MTEC | daily maximum | report only (CFU/100mL) | all year |
| E. coli, thermotol, MF, MTEC | daily maximum | report only (CFU/100mL) | all year |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ 16 MGD | all year |
| Chlorine, total residual | daily maximum | report only (mg/L) | all year |
| Chlorine, total residual | daily maximum | report only (mg/L) | May–Oct |
| Solids, total dissolved [TDS] | daily maximum | report only (mg/L) | all year |
| Solids, total dissolved [TDS] | daily maximum | report only (mg/L) | May–Oct |
| Chemical oxygen demand [COD] | daily maximum | report only (mg/L) | all year |
| LC50 Static 48Hr Acute Ceriodaphnia dubia | monthly average minimum | report only (%) | all year |
| LC50 Static 48Hr Acute Pimephales promelas | monthly average minimum | report only (%) | all year |
| NOAEL Static 48Hr Acute Ceriodaphnia dubia | monthly average minimum | report only (%) | May–Oct |
| NOAEL Static 48Hr Acute Pimephales promelas | monthly average minimum | report only (%) | May–Oct |
Cited limits by parameter: Massachusetts's rules and the federal ones.
Same industry: the 3 Local and Interurban Passenger Transit permits in Massachusetts.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/MA0028941 · MCP: https://passage-data.com/mcp