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Electric Services, major discharger, Plymouth, Massachusetts. NPDES permit MA0003557 expired Jun 30, 2025; its limits still apply. Last 12 months: over a limit 3 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Outfall | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|---|
| October 2025 | 004 | Solids, total suspended, monthly average | 56 mg/L | ≤ 30 mg/L | 87% |
| April 2026 | 010 | Solids, total suspended, monthly average | 40 mg/L | ≤ 30 mg/L | 33% |
| July 2026 | 007 | Solids, total suspended, monthly average | 48.4 mg/L | ≤ 30 mg/L | 61% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | all year | 001 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 001 |
| pH | maximum | report only (SU) | all year | 001 |
| pH | maximum | report only (SU) | all year | 001 |
| Salinity | daily maximum | report only (mg/kg) | all year | 001 |
| Solids, total | daily maximum | report only (mg/L) | all year | 001 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 001 |
| Oil & Grease | monthly average | report only (mg/L) | all year | 001 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Carbon, tot organic [TOC] | daily maximum | report only (mg/L) | all year | 001 |
| Sodium nitrite | monthly average | report only (mg/L) | all year | 001 |
| Sodium nitrite | daily maximum | ≤ 2 mg/L | all year | 001 |
| Nickel, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Zinc, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Cadmium, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Lead, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Copper, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Oxidants, total residual | monthly average | ≤ .1 mg/L | all year | 001 |
| Oxidants, total residual | daily maximum | ≤ .1 mg/L | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ 224 MGD | all year | 001 |
| Chlorine, total residual | daily maximum | report only (mg/L) | all year | 001 |
| Temp. diff. between intake and discharge | daily maximum | report only (deg F) | all year | 001 |
| Duration of discharge | daily maximum | report only (hr) | all year | 001 |
| Tolytriazole | monthly average | report only (mg/L) | all year | 001 |
| Tolytriazole | daily maximum | ≤ 1.48 mg/L | all year | 001 |
| LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia) | daily maximum | report only (%) | all year | 001 |
| LC50 Static 48Hr Acute Menidia | daily maximum | report only (%) | all year | 001 |
| pH | maximum | report only (SU) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ 28 MGD | all year | 002 |
| Number of Events | daily maximum | ≤ 1 # | all year | 002 |
| Duration of discharge | daily maximum | report only (hr) | all year | 002 |
| pH | minimum | ≥ 6 SU | all year | 004 |
| pH | minimum | report only (SU) | all year | 004 |
| pH | minimum | report only (SU) | all year | 004 |
| pH | daily maximum | ≤ 8.5 SU | all year | 004 |
| pH | maximum | report only (SU) | all year | 004 |
| pH | maximum | report only (SU) | all year | 004 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 004 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 004 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 004 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 004 |
| Oil & Grease | daily maximum | ≤ 5 mg/L | all year | 004 |
| Cyanide, free [as free] | daily maximum | report only (ug/L) | all year | 004 |
| Cyanide, free [as free] | daily maximum | report only (ug/L) | all year | 004 |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | 004 |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | 004 |
| Nickel, total recoverable | daily maximum | report only (ug/L) | all year | 004 |
| Nickel, total recoverable | daily maximum | report only (ug/L) | all year | 004 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 004 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 004 |
| Cadmium, total recoverable | maximum | report only (ug/L) | all year | 004 |
| Cadmium, total recoverable | maximum | report only (ug/L) | all year | 004 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 004 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 004 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 004 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 004 |
| Antimony, total recoverable | daily maximum | report only (ug/L) | all year | 004 |
| Antimony, total recoverable | daily maximum | report only (ug/L) | all year | 004 |
| Total phenols | daily maximum | report only (ug/L) | all year | 004 |
| Total phenols | daily maximum | report only (ug/L) | all year | 004 |
| Polychlorinated biphenyls [PCBs] | daily maximum | report only (ug/L) | all year | 004 |
| Polychlorinated biphenyls [PCBs] | daily maximum | report only (ug/L) | all year | 004 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 004 |
| Chromium, hexavalent tot recoverable | maximum | report only (ug/L) | all year | 004 |
| Chromium, hexavalent tot recoverable | maximum | report only (ug/L) | all year | 004 |
| Phthalates, total | daily maximum | report only (ug/L) | all year | 004 |
| Phthalates, total | daily maximum | report only (ug/L) | all year | 004 |
| pH | minimum | ≥ 6 SU | all year | 005 |
| pH | minimum | report only (SU) | all year | 005 |
| pH | minimum | report only (SU) | all year | 005 |
| pH | maximum | ≤ 8.5 SU | all year | 005 |
| pH | maximum | report only (SU) | all year | 005 |
| pH | maximum | report only (SU) | all year | 005 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 005 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 005 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 005 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 005 |
| Oil & Grease | daily maximum | ≤ 5 mg/L | all year | 005 |
| Cyanide, free [as free] | daily maximum | report only (ug/L) | all year | 005 |
| Cyanide, free [as free] | daily maximum | report only (ug/L) | all year | 005 |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Nickel, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Nickel, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Cadmium, total recoverable | maximum | report only (ug/L) | all year | 005 |
| Cadmium, total recoverable | maximum | report only (ug/L) | all year | 005 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Antimony, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Antimony, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Total phenols | daily maximum | report only (ug/L) | all year | 005 |
| Total phenols | daily maximum | report only (ug/L) | all year | 005 |
| Polychlorinated biphenyls [PCBs] | daily maximum | report only (ug/L) | all year | 005 |
| Polychlorinated biphenyls [PCBs] | daily maximum | report only (ug/L) | all year | 005 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 005 |
| Chromium, hexavalent tot recoverable | maximum | report only (ug/L) | all year | 005 |
| Chromium, hexavalent tot recoverable | maximum | report only (ug/L) | all year | 005 |
| Phthalates, total | daily maximum | report only (ug/L) | all year | 005 |
| Phthalates, total | daily maximum | report only (ug/L) | all year | 005 |
| pH | minimum | ≥ 6 SU | all year | 006 |
| pH | maximum | ≤ 8.5 SU | all year | 006 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 006 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 006 |
| Oil & Grease | daily maximum | ≤ 5 mg/L | all year | 006 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 006 |
| pH | minimum | ≥ 6 SU | all year | 007 |
| pH | minimum | report only (SU) | all year | 007 |
| pH | maximum | ≤ 8.5 SU | all year | 007 |
| pH | maximum | report only (SU) | all year | 007 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 007 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 007 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 007 |
| Oil & Grease | daily maximum | ≤ 5 mg/L | all year | 007 |
| Cyanide, free [as free] | daily maximum | report only (ug/L) | all year | 007 |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | 007 |
| Nickel, total recoverable | daily maximum | report only (ug/L) | all year | 007 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 007 |
| Cadmium, total recoverable | maximum | report only (ug/L) | all year | 007 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 007 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 007 |
| Antimony, total recoverable | daily maximum | report only (ug/L) | all year | 007 |
| Total phenols | daily maximum | report only (ug/L) | all year | 007 |
| Polychlorinated biphenyls [PCBs] | daily maximum | report only (ug/L) | all year | 007 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 007 |
| Chromium, hexavalent tot recoverable | maximum | report only (ug/L) | all year | 007 |
| Phthalates, total | daily maximum | report only (ug/L) | all year | 007 |
| Temperature, water deg. fahrenheit | monthly average | ≤ 80 deg F | all year | 010 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 90 deg F | all year | 010 |
| pH | minimum | ≥ 6.5 SU | all year | 010 |
| pH | maximum | ≤ 8.5 SU | all year | 010 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 010 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 010 |
| Oil & Grease | monthly average | ≤ 15 mg/L | all year | 010 |
| Oil & Grease | daily maximum | ≤ 20 mg/L | all year | 010 |
| Oxidants, total residual | monthly average | ≤ .5 mg/L | all year | 010 |
| Oxidants, total residual | daily maximum | ≤ 1 mg/L | all year | 010 |
| Flow, in conduit or thru treatment plant | monthly average | ≤ 15.6 MGD | all year | 010 |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ 19.4 MGD | all year | 010 |
| Temp. diff. between intake and discharge | daily maximum | ≤ 10 deg F | all year | 010 |
| Velocity of intake | monthly average | report only (ft/sec) | all year | 010 |
| Velocity of intake | daily maximum | ≤ .5 ft/sec | all year | 010 |
| pH | minimum | ≥ 6.1 SU | all year | 011 |
| pH | maximum | ≤ 8.4 SU | all year | 011 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 011 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 011 |
| Oil & Grease | monthly average | ≤ 15 mg/L | all year | 011 |
| Oil & Grease | daily maximum | ≤ 20 mg/L | all year | 011 |
| Boron, total [as B] | monthly average | report only (mg/L) | all year | 011 |
| Boron, total [as B] | daily maximum | ≤ 5.6 mg/L | all year | 011 |
| Boron, total [as B] | monthly average | report only (mg/L) | all year | 011 |
| Boron, total [as B] | daily maximum | report only (mg/L) | all year | 011 |
| Flow, in conduit or thru treatment plant | monthly average | ≤ .015 MGD | all year | 011 |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ .06 MGD | all year | 011 |
| pH | minimum | ≥ 6.5 SU | all year | 012 |
| pH | maximum | ≤ 8.5 SU | all year | 012 |
| Oxidants, total residual | monthly average | report only (mg/L) | all year | 012 |
| Oxidants, total residual | daily maximum | report only (mg/L) | all year | 012 |
| Flow, in conduit or thru treatment plant | monthly average | ≤ 4.1 MGD | all year | 012 |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ 4.1 MGD | all year | 012 |
| pH | minimum | ≥ 6.1 SU | all year | 014 |
| pH | maximum | ≤ 8.4 SU | all year | 014 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 014 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 014 |
| Oil & Grease | monthly average | ≤ 15 ug/L | all year | 014 |
| Oil & Grease | daily maximum | ≤ 20 ug/L | all year | 014 |
| Boron, total [as B] | monthly average | report only (mg/L) | all year | 014 |
| Boron, total [as B] | daily maximum | ≤ 5.6 mg/L | all year | 014 |
| Boron, total [as B] | monthly average | report only (mg/L) | all year | 014 |
| Boron, total [as B] | daily maximum | report only (mg/L) | all year | 014 |
| Flow, in conduit or thru treatment plant | monthly average | ≤ .015 MGD | all year | 014 |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ .06 MGD | all year | 014 |
Cited limits by parameter: Massachusetts's rules and the federal ones.
Same industry: the 6 Electric Services 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/MA0003557 · MCP: https://passage-data.com/mcp