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Hilcorp

Crude Petroleum And Natural Gas, Prudhoe Bay, Alaska. NPDES permit AK0053767 expired Jun 30, 2023; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (13 values), outfall 002 form A monthly (6 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 24 reports late

Limits in force (19)

ParameterStatisticLimitMonthsOutfall
Temp. diff. between samp. & upstrm deg. Cmonthly averagereport only (deg C)all year001
Temp. diff. between samp. & upstrm deg. Cdaily maximum≤ 39 deg Call year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 60 mg/Lall year001
pHinstantaneous minimum≥ 6.5 SUall year001
pHinstantaneous maximum≤ 8.5 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendeddaily maximum≤ 60 mg/Lall year001
Copper, total recoverablemonthly average≤ 24 ug/Lall year001
Copper, total recoverabledaily maximum≤ 48 ug/Lall year001
Floating solids, waste or visible foam-visualvaluereport only (N=0;Y=1)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (gal/d)all year001
Flow, in conduit or thru treatment plantdaily maximum≤ 20800 gal/dall year001
pHinstantaneous minimum≥ 6.5 SUall year002
pHinstantaneous maximum≤ 8.5 SUall year002
Salinitymonthly average≤ 289 ppkall year002
Salinitydaily maximum≤ 580 ppkall year002
Flow, in conduit or thru treatment plantmonthly averagereport only (gal/d)all year002
Flow, in conduit or thru treatment plantdaily maximum≤ 111500 gal/dall year002

How strict are these limits?

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

Same industry: the 11 Oil and Gas Extraction permits in Alaska.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/AK0053767 · MCP: https://passage-data.com/mcp