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Hunt Southland Refining Co LLC

Petroleum Refining, Heidelerg, Mississippi. NPDES permit MS0001686, in force until Jul 31, 2031. Last 12 months: over a limit 2 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (54 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
2 values over a limit, 6 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
August 2026Solids, total suspended, daily maximum79.4 lb/d≤ 71 lb/d12%
August 2026Solids, total suspended, monthly average56.5 lb/d≤ 43.8 lb/d29%

Limits in force (54)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheitmaximum≤ 90 deg Fall year
Oxygen, dissolved [DO]minimum≥ 6 mg/Lall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 42 mg/Lall year
Solids, total suspendeddaily maximum≤ 68.1 mg/Lall year
Solids, total suspendedmonthly average≤ 43.8 lb/dall year
Solids, total suspendeddaily maximum≤ 71 lb/dall year
Oil & Greasemonthly average≤ 13.5 mg/Lall year
Oil & Greasedaily maximum≤ 25.7 mg/Lall year
Oil & Greasemonthly average≤ 15.8 lb/dall year
Oil & Greasedaily maximum≤ 30.4 lb/dall year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
Nitrogen, total [as N]daily maximumreport only (lb/d)all year
Nitrogen, ammonia total [as N]monthly average≤ 1.46 mg/Lall year
Nitrogen, ammonia total [as N]daily maximum≤ 2.92 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 1.52 lb/dall year
Nitrogen, ammonia total [as N]daily maximum≤ 3.04 lb/dall year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Phosphorus, total [as P]daily maximumreport only (lb/d)all year
Sulfide, total [as S]monthly average≤ .65 mg/Lall year
Sulfide, total [as S]daily maximum≤ 1.44 mg/Lall year
Sulfide, total [as S]monthly average≤ .71 lb/dall year
Sulfide, total [as S]daily maximum≤ 1.56 lb/dall year
Chromium, hexavalent [as Cr]monthly average≤ .011 mg/Lall year
Chromium, hexavalent [as Cr]daily maximum≤ .016 mg/Lall year
Chromium, hexavalent [as Cr]monthly average≤ .013 lb/dall year
Chromium, hexavalent [as Cr]daily maximum≤ .019 lb/dall year
Chromium, total [as Cr]monthly average≤ .042 mg/Lall year
Chromium, total [as Cr]daily maximum≤ .089 mg/Lall year
Chromium, total [as Cr]monthly average≤ .044 lb/dall year
Chromium, total [as Cr]daily maximum≤ .093 lb/dall year
Zinc, total [as Zn]monthly average≤ .076 mg/Lall year
Zinc, total [as Zn]daily maximum≤ .076 mg/Lall year
Zinc, total [as Zn]monthly average≤ .089 lb/dall year
Zinc, total [as Zn]daily maximum≤ .089 lb/dall year
Aluminum, total recoverablemonthly average≤ .7 mg/Lall year
Aluminum, total recoverabledaily maximum≤ 2 mg/Lall year
Aluminum, total recoverablemonthly averagereport only (lb/d)all year
Aluminum, total recoverabledaily maximumreport only (lb/d)all year
Phenolic compounds, totalmonthly average≤ .102 mg/Lall year
Phenolic compounds, totaldaily maximum≤ .3 mg/Lall year
Phenolic compounds, totalmonthly average≤ .12 lb/dall year
Phenolic compounds, totaldaily maximum≤ .3 lb/dall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 15.9 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 28 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 16.6 lb/dall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 33.2 lb/dall year
Chemical Oxygen Demand [COD]monthly average≤ 218.7 mg/Lall year
Chemical Oxygen Demand [COD]daily maximum≤ 423 mg/Lall year
Chemical Oxygen Demand [COD]monthly average≤ 259 lb/dall year
Chemical Oxygen Demand [COD]daily maximum≤ 500.9 lb/dall year
Flow, totalmonthly averagereport only (MGD)all year
Flow, totaldaily maximumreport only (MGD)all year

How strict are these limits?

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

Same industry: the 6 Petroleum Refining and Related Industries permits in Mississippi.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MS0001686 · MCP: https://passage-data.com/mcp