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Potac, LLC

Petroleum Refining, Corpus Christi, Texas. NPDES permit TX0096474 expired May 22, 2026; its limits still apply. Last 12 months: over a limit 2 times (last October 2025). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form A monthly (26 values), outfall TXA form S twice a year
Last report on file
September 2026
Oct 2024 – Sep 2025
3 values over a limit, 0 required values missing, 1 of 14 reports late

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

Period endingParameterReportedLimitOver by
October 2025Sulfide, total [as S], daily average.2756 lb/d≤ .16 lb/d72%
October 2025Sulfide, total [as S], daily maximum.3935 lb/d≤ .32 lb/d23%

Limits in force (30)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cdaily average≤ 26 lb/dall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 49 lb/dall year001
Oxygen demand, chem. [high level] [COD]daily average≤ 132 lb/dall year001
Oxygen demand, chem. [high level] [COD]daily maximum≤ 256 lb/dall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendeddaily average≤ 24 lb/dall year001
Solids, total suspendeddaily maximum≤ 38 lb/dall year001
Oil & Greasedaily average≤ 8.6 lb/dall year001
Oil & Greasedaily maximum≤ 16 lb/dall year001
Nitrogen, ammonia total [as N]daily average≤ 5.1 lb/dall year001
Nitrogen, ammonia total [as N]daily maximum≤ 11 lb/dall year001
Sulfide, total [as S]daily average≤ .16 lb/dall year001
Sulfide, total [as S]daily maximum≤ .32 lb/dall year001
Chromium, hexavalent [as Cr]daily average≤ .058 lb/dall year001
Chromium, hexavalent [as Cr]daily maximum≤ .12 lb/dall year001
Chromium, total [as Cr]daily average≤ .28 lb/dall year001
Chromium, total [as Cr]daily maximum≤ .6 lb/dall year001
Zinc, total [as Zn]daily average≤ .16 mg/Lall year001
Zinc, total [as Zn]daily maximum≤ .33 mg/Lall year001
Zinc, total [as Zn]daily average≤ .036 lb/dall year001
Zinc, total [as Zn]daily maximum≤ .76 lb/dall year001
Flow, in conduit or thru treatment plantdaily average≤ .12 MGDall year001
Flow, in conduit or thru treatment plantdaily maximum≤ .16 MGDall year001
Phenolic compounds, totaldaily average≤ .19 lb/dall year001
Phenolic compounds, totaldaily maximum≤ .39 lb/dall year001
Whole effluent toxicitydaily average≤ 100 %all yearTXA
Whole effluent toxicitydaily maximum≤ 100 %all yearTXA
LC50 Pass/Fail Static 24Hr Acute Americamysis bahia (formerly Mysidopsis bahia)single samplereport only (pass=0;fail=1)all yearTXA
LC50 Pass/Fail Static 24Hr Acute Menidia menidiasingle samplereport only (pass=0;fail=1)all yearTXA

How strict are these limits?

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

Same industry: the 32 Petroleum Refining and Related Industries permits in Texas.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/TX0096474 · MCP: https://passage-data.com/mcp