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Neptune Deepwater Port

Oil And Gas Field Machinery, Boston, Massachusetts. NPDES permit MA0040258 expired Jul 31, 2013; its limits still apply. Last 12 months: no values over a limit, 10 of 60 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 003 form A monthly (7 values), outfall 04A form 1 monthly (2 values), outfall 04B form 1 monthly (2 values), outfall 4AC form 1 monthly (1 value), outfall 4BC form 1 monthly (1 value)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 5 of 60 reports late

Limits in force (13)

ParameterStatisticLimitMonthsOutfall
Flow ratemaximum≤ 2101 gal/minall year003
Oxygen, dissolved [DO]minimum≥ 6 mg/Lall year003
pHminimum≥ 6.5 SUall year003
pHmaximum≤ 8.5 SUall year003
Solids, total suspendedmaximum≤ 100 mg/Lall year003
Sodium Bisulfitemaximum≤ 11 mg/Lall year003
Chemical Oxygen Demand [COD]maximum≤ 15 mg/Lall year003
Temp. diff. between intake and dischargedaily maximum≤ 8 deg Call year04A
Flowdaily maximum≤ 8.2 MGDall year04A
Temp. diff. between intake and dischargedaily maximum≤ 8 deg Call year04B
Flowdaily maximum≤ 8.2 MGDall year04B
Flow ratedaily maximum≤ 2.25 gal/minall year4AC
Flow ratedaily maximum≤ 2.25 gal/minall year4BC

How strict are these limits?

Cited limits by parameter: Massachusetts's rules and the federal ones.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MA0040258 · MCP: https://passage-data.com/mcp