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Wilmar, City of

Sewage treatment plant, Wilmar, Arkansas. NPDES permit AR0040096 expired Jan 31, 2024; its limits still apply. Last 12 months: over a limit 8 times (last July 2026), 68 required values missing, 7 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: form A monthly (18 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
8 values over a limit, 180 required values missing, 11 of 12 reports late

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

Period endingParameterReportedLimitOver by
October 2025Coliform, fecal general, 7-day geometric mean> 2420≤ 2000 #/100mL—
October 2025Coliform, fecal general, 7-day geometric mean> 2420≤ 2000 #/100mL—
December 2025Solids, total suspended, 7-day average37≤ 30 mg/L23%
December 2025Solids, total suspended, monthly average18.36≤ 16.7 lb/d10%
December 2025Solids, total suspended, monthly average21.25≤ 20 mg/L6%
June 2026Coliform, fecal general, 7-day geometric mean> 2420 #/100mL≤ 2000 #/100mL—
July 2026Oxygen, dissolved [DO], instantaneous minimum2.43 mg/L≥ 3 mg/L19%
July 2026Solids, total suspended, monthly average1500 mg/L≤ 20 mg/L7400%

Limits in force (24)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 3 mg/Lall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 20 mg/Lall year
Solids, total suspended7-day average≤ 30 mg/Lall year
Solids, total suspendedmonthly average≤ 16.7 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 12 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 6.1 mg/LApr
Nitrogen, ammonia total [as N]monthly average≤ 6 mg/LMay–Oct
Nitrogen, ammonia total [as N]7-day average≤ 17 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]7-day average≤ 6.1 mg/LApr
Nitrogen, ammonia total [as N]7-day average≤ 9 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 10 lb/dJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 5.1 lb/dApr
Nitrogen, ammonia total [as N]monthly average≤ 5 lb/dMay–Oct
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Coliform, fecal general30-day geometric mean≤ 1000 #/100mLall year
Coliform, fecal general7-day geometric mean≤ 2000 #/100mLall year
Overflowsmonthly totalreport only (occur/mo)all year
Overflow volume [SS0 volume, CSO volume]monthly totalreport only (gal)all year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 20 mg/Lall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 30 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 16.7 lb/dall year

How strict are these limits?

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/AR0040096 · MCP: https://passage-data.com/mcp