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Vilonia, City of

Sewage treatment plant, Vilonia, Arkansas. NPDES permit AR0047121 expired Jul 31, 2025; its limits still apply. Last 12 months: over a limit 15 times (last August 2026), 8 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: form A monthly (19 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
33 values over a limit, 0 required values missing, 10 of 12 reports late

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

All 15 values over a limit
Period endingParameterReportedLimitOver by
November 2025pH, minimum5.45 SU≥ 6 SU—
February 2026pH, minimum5.89 SU≥ 6 SU—
March 2026Coliform, fecal general, 7-day geometric mean> 2000 #/100mL≤ 2000 #/100mL—
April 2026Nitrogen, ammonia total [as N], 7-day average12.1 mg/L≤ 5.6 mg/L116%
April 2026Nitrogen, ammonia total [as N], monthly average6.3 mg/L≤ 5.6 mg/L13%
May 2026Coliform, fecal general, 30-day geometric mean470 #/100mL≤ 200 #/100mL135%
May 2026Coliform, fecal general, 7-day geometric mean1905 #/100mL≤ 400 #/100mL376%
May 2026Nitrogen, ammonia total [as N], 7-day average7.2 mg/L≤ 5.6 mg/L29%
June 2026Nitrogen, ammonia total [as N], 7-day average6 mg/L≤ 5.6 mg/L7%
July 2026Coliform, fecal general, 30-day geometric mean1196 #/100mL≤ 200 #/100mL498%
July 2026Coliform, fecal general, 7-day geometric mean1300 #/100mL≤ 400 #/100mL225%
July 2026Nitrogen, ammonia total [as N], 7-day average9.7 mg/L≤ 5.6 mg/L73%
July 2026Nitrogen, ammonia total [as N], monthly average6.1 mg/L≤ 5 mg/L22%
August 2026Coliform, fecal general, 30-day geometric mean663 #/100mL≤ 200 #/100mL232%
August 2026Coliform, fecal general, 7-day geometric mean1144 #/100mL≤ 400 #/100mL186%

Limits in force (28)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 4 mg/LMay–Oct
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/LJan, Feb, Mar, Apr, Nov, Dec
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 15 mg/Lall year
Solids, total suspended7-day average≤ 22.5 mg/Lall year
Solids, total suspendedmonthly average≤ 62.6 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 9 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 5.6 mg/LApr
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/LMay–Oct
Nitrogen, ammonia total [as N]7-day average≤ 13.5 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]7-day average≤ 5.6 mg/LApr
Nitrogen, ammonia total [as N]7-day average≤ 5.6 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 37.5 lb/dJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 23.4 lb/dApr
Nitrogen, ammonia total [as N]monthly average≤ 20.9 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
Chlorine, total residualinstantaneous maximum≤ .011 mg/Lall year
Coliform, fecal general30-day geometric mean≤ 200 #/100mLMay–Sep
Coliform, fecal general30-day geometric mean≤ 1000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
Coliform, fecal general7-day geometric mean≤ 400 #/100mLMay–Sep
Coliform, fecal general7-day geometric mean≤ 2000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
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≤ 15 mg/Lall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 23 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 62.6 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/AR0047121 · MCP: https://passage-data.com/mcp