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Viola, City of

Sewage treatment plant, Viola, Arkansas. NPDES permit AR0052981 expired Aug 31, 2024; its limits still apply. Last 12 months: over a limit 12 times (last August 2026), 6 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: form A monthly (24 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
21 values over a limit, 0 required values missing, 4 of 12 reports late

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

Period endingParameterReportedLimitOver by
October 2025Phosphorus, total [as P], 7-day average3.45 mg/L≤ 3 mg/L15%
October 2025Phosphorus, total [as P], monthly average2.22 lb/d≤ 1.7 lb/d31%
October 2025Phosphorus, total [as P], monthly average3.45 mg/L≤ 2 mg/L73%
November 2025Coliform, fecal general, 30-day geometric mean230 #/100mL≤ 200 #/100mL15%
December 2025Coliform, fecal general, 30-day geometric mean> 2000 #/100mL≤ 200 #/100mL—
December 2025Coliform, fecal general, 7-day geometric mean> 2000 #/100mL≤ 400 #/100mL—
January 2026Phosphorus, total [as P], monthly average2.27 lb/d≤ 1.7 lb/d34%
January 2026Phosphorus, total [as P], monthly average2.86 mg/L≤ 2 mg/L43%
February 2026Nitrogen, ammonia total [as N], 7-day average17.8 mg/L≤ 12 mg/L48%
February 2026Nitrogen, ammonia total [as N], monthly average17.8 mg/L≤ 12 mg/L48%
August 2026Phosphorus, total [as P], 7-day average3.19 mg/L≤ 3 mg/L6%
August 2026Phosphorus, total [as P], monthly average3.19 mg/L≤ 2 mg/L60%

Limits in force (31)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/LMay–Oct
Oxygen, dissolved [DO]instantaneous minimum≥ 3 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≤ 12.5 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 4.5 mg/LApr
Nitrogen, ammonia total [as N]monthly average≤ 6 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 12 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]7-day average≤ 4.5 mg/LApr
Nitrogen, ammonia total [as N]7-day average≤ 9 mg/LMay–Oct
Nitrogen, ammonia total [as N]7-day average≤ 12 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 3.8 lb/dApr
Nitrogen, ammonia total [as N]monthly average≤ 5 lb/dMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 10 lb/dJan, Feb, Mar, Nov, Dec
Nitrite + Nitrate total [as N]monthly average≤ 10 mg/Lall year
Nitrite + Nitrate total [as N]7-day average≤ 10 mg/Lall year
Nitrite + Nitrate total [as N]monthly average≤ 8.3 lb/dall year
Phosphorus, total [as P]monthly average≤ 2 mg/Lall year
Phosphorus, total [as P]7-day average≤ 3 mg/Lall year
Phosphorus, total [as P]monthly average≤ 1.7 lb/dall year
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≤ 200 #/100mLall year
Coliform, fecal general7-day geometric mean≤ 400 #/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≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 15 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 8.3 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/AR0052981 · MCP: https://passage-data.com/mcp