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Markwest Liberty Midstream & Resources LLC

Crude Petroleum And Natural Gas, Mcdonald, Pennsylvania. NPDES permit PA0285111, in force until Jul 31, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (13 values), form Q quarterly (4 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 1 of 16 reports late

Limits in force (17)

ParameterStatisticLimitMonths
Oxygen demand, chem. [high level] [COD]instantaneous maximumreport only (mg/L)all year
pHinstantaneous minimum≥ 6 SUall year
pHinstantaneous maximum≤ 9 SUall year
Solids, total suspendedinstantaneous maximum≤ 75 mg/Lall year
Oil & Greaseinstantaneous maximum≤ 30 mg/Lall year
Nitrogen, total [as N]instantaneous maximumreport only (mg/L)all year
Phosphorus, total [as P]instantaneous maximumreport only (mg/L)all year
Iron, total [as Fe]instantaneous maximumreport only (mg/L)all year
Manganese, total [as Mn]instantaneous maximum≤ 2 mg/Lall year
Aluminum, total [as Al]instantaneous maximum≤ .75 mg/Lall year
Benzene, ethylbenzene, toluene, xylene combinationinstantaneous maximum≤ .25 mg/Lall year
Benzeneinstantaneous maximum≤ 2.5 ug/Lall year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Perfluorooctanoic acid (PFOA)daily maximumreport only (ng/L)all year
Perfluorooctanesulfonatedaily maximumreport only (ng/L)all year
Perfluorobutanesulfonic acid (PFBS)daily maximumreport only (ng/L)all year
Hexafluoropropylene oxide dimer acid (HFPO-DA)daily maximumreport only (ng/L)all year

How strict are these limits?

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

Same industry: the 16 Oil and Gas Extraction permits in Pennsylvania.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/PA0285111 · MCP: https://passage-data.com/mcp