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Potter Station Unit 2

Electric Services, Braintree, Massachusetts. NPDES permit MA0005517 expired Jan 31, 2014; its limits still apply. Last 12 months: over a limit 2 times (last April 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (14 values), outfall 002 form A monthly (17 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 2 required values missing, 0 of 24 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimit
March 2026pH, minimum≥ 6.4 SU≥ 6.5 SU
April 2026pH, minimum6.3 SU≥ 6.5 SU

Limits in force (31)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)all year001
Temperature, water deg. fahrenheitdaily maximum≤ 85 deg Fall year001
Flow ratemonthly averagereport only (gal/min)all year001
Flow ratedaily maximum≤ 250 gal/minall year001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 8.5 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendeddaily maximum≤ 100 mg/Lall year001
Oil & Greasemonthly average≤ 15 mg/Lall year001
Oil & Greasedaily maximum≤ 15 mg/Lall year001
Oxidants, total residualmonthly average≤ .1 mg/Lall year001
Oxidants, total residualdaily maximum≤ .1 mg/Lall year001
Flow, in conduit or thru treatment plantmonthly average≤ 40000 gal/dall year001
Flow, in conduit or thru treatment plantdaily maximum≤ 80000 gal/dall year001
pHminimum≥ 6.5 SUall year002
pHmaximum≤ 8.5 SUall year002
Solids, total suspendedmonthly average≤ 100 mg/Lall year002
Solids, total suspendeddaily maximumreport only (mg/L)all year002
Oil & Greasemonthly averagereport only (mg/L)all year002
Oil & Greasedaily maximum≤ 15 mg/Lall year002
Iron, total recoverablemonthly averagereport only (mg/L)all year002
Iron, total recoverabledaily maximumreport only (mg/L)all year002
Toluenemonthly averagereport only (ug/L)all year002
Toluenedaily maximumreport only (ug/L)all year002
Ethylbenzenemonthly averagereport only (ug/L)all year002
EthylbenzeneEPA's "MAX BDL"report only (ug/L)all year002
BTEXdaily maximumreport only (ug/L)all year002
Flow, in conduit or thru treatment plantmonthly averagereport only (gal/d)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (gal/d)all year002
Xylene [mix of m+o+p]monthly averagereport only (ug/L)all year002
Xylene [mix of m+o+p]daily maximumreport only (ug/L)all year002

How strict are these limits?

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/MA0005517 · MCP: https://passage-data.com/mcp