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Arq Solutions (Red River), LLC - Red River Plant

Industrial Inorganic Chemicals, Coushatta, Louisiana. NPDES permit LA0124567 expired Jun 30, 2025; its limits still apply. Last 12 months: over a limit 9 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 89 days after each period: outfall 001 form A quarterly (10 values), outfall 001 form Y yearly, outfall 002 form S twice a year
Last report on file
June 2026
Oct 2024 – Sep 2025
4 values over a limit, 0 required values missing, 3 of 15 reports late

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

Period endingOutfallParameterReportedLimitOver by
December 2025001Oil & Grease, daily maximum19.2 mg/L≤ 15 mg/L28%
February 2026001pH, instantaneous minimum0 SU≥ 6 SU—
May 2026001Carbon, tot organic [TOC], daily maximum81.1 mg/L≤ 50 mg/L62%
June 2026002BOD, 5-day, 20 deg. C, daily maximum55.1 mg/L≤ 45 mg/L22%
June 2026002BOD, 5-day, 20 deg. C, monthly average55.1 mg/L≤ 30 mg/L84%
June 2026002Coliform, fecal general, daily maximum40000 #/100mL≤ 400 #/100mL9900%
June 2026002Coliform, fecal general, monthly geometric mean11057 #/100mL≤ 200 #/100mL5429%
June 2026002Solids, total suspended, daily maximum148 mg/L≤ 45 mg/L229%
June 2026002Solids, total suspended, monthly average148 mg/L≤ 30 mg/L393%

Limits in force (22)

ParameterStatisticLimitMonthsOutfall
pHinstantaneous minimum≥ 6 SUall year001
pHinstantaneous maximum≤ 9 SUall year001
Oil & Greasedaily maximum≤ 15 mg/Lall year001
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year001
Chromium, total [as Cr]monthly average≤ .2 mg/Lall year001
Chromium, total [as Cr]daily maximum≤ .2 mg/Lall year001
Zinc, total [as Zn]monthly average≤ 1 mg/Lall year001
Zinc, total [as Zn]daily maximum≤ 1 mg/Lall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, free availablemonthly average≤ .2 mg/Lall year001
Chlorine, free availabledaily maximum≤ .5 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year002
BOD, 5-day, 20 deg. Cdaily maximum≤ 45 mg/Lall year002
pHinstantaneous minimum≥ 6 SUall year002
pHinstantaneous maximum≤ 9 SUall year002
Solids, total suspendedmonthly average≤ 30 mg/Lall year002
Solids, total suspendeddaily maximum≤ 45 mg/Lall year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year002
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year002

How strict are these limits?

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

Same industry: the 130 Chemicals and Allied Products permits in Louisiana.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/LA0124567 · MCP: https://passage-data.com/mcp