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Danville, City of

Sewage treatment plant, Danville, Arkansas. NPDES permit AR0022241 expired Sep 30, 2024; its limits still apply. Last 12 months: over a limit 13 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form A monthly (18 values), outfall 002 form A monthly (19 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
17 values over a limit, 0 required values missing, 0 of 24 reports late

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

All 13 values over a limit
Period endingParameterReportedLimitOver by
December 2025Solids, total suspended, 7-day average23 mg/L≤ 22.5 mg/L2%
January 2026Solids, total suspended, 7-day average45 mg/L≤ 22.5 mg/L100%
January 2026Solids, total suspended, monthly average30 mg/L≤ 15 mg/L100%
April 2026BOD, carbonaceous [5 day, 20 C], 7-day average34 mg/L≤ 15 mg/L127%
April 2026BOD, carbonaceous [5 day, 20 C], monthly average13.03 mg/L≤ 10 mg/L30%
May 2026Solids, total suspended, 7-day average40 mg/L≤ 22.5 mg/L78%
May 2026Solids, total suspended, monthly average21 mg/L≤ 15 mg/L40%
June 2026BOD, carbonaceous [5 day, 20 C], 7-day average45 mg/L≤ 15 mg/L200%
June 2026BOD, carbonaceous [5 day, 20 C], monthly average17.3 mg/L≤ 10 mg/L73%
June 2026Nitrogen, ammonia total [as N], 7-day average6.4 mg/L≤ 3 mg/L113%
June 2026Nitrogen, ammonia total [as N], monthly average2.71 mg/L≤ 2 mg/L36%
July 2026Nitrogen, ammonia total [as N], 7-day average9.3 mg/L≤ 3 mg/L210%
July 2026Nitrogen, ammonia total [as N], monthly average3.42 mg/L≤ 2 mg/L71%

Limits in force (55)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 6 mg/LMay–Oct001
Oxygen, dissolved [DO]instantaneous minimum≥ 3 mg/LJan, Feb, Mar, Apr, Nov, Dec001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 15 mg/Lall year001
Solids, total suspended7-day average≤ 22.5 mg/Lall year001
Solids, total suspendedmonthly average≤ 18.8 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 10 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 10 mg/LJan, Feb, Mar, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/LMay–Oct001
Nitrogen, ammonia total [as N]7-day average≤ 10.5 mg/LApr001
Nitrogen, ammonia total [as N]7-day average≤ 15 mg/LJan, Feb, Mar, Nov, Dec001
Nitrogen, ammonia total [as N]7-day average≤ 3 mg/LMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 12.5 lb/dApr001
Nitrogen, ammonia total [as N]monthly average≤ 12.5 lb/dJan, Feb, Mar, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 2.5 lb/dMay–Oct001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Coliform, fecal general30-day geometric mean≤ 200 #/100mLMay–Sep001
Coliform, fecal general30-day geometric mean≤ 1000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec001
Coliform, fecal general7-day geometric mean≤ 400 #/100mLMay–Sep001
Coliform, fecal general7-day geometric mean≤ 2000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec001
Overflowsmonthly totalreport only (occur/mo)all year001
Overflow volume [SS0 volume, CSO volume]monthly totalreport only (gal)all year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]7-day average≤ 15 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 12.5 lb/dall year001
Oxygen, dissolved [DO]instantaneous minimum≥ 6 mg/LMay–Oct002
Oxygen, dissolved [DO]instantaneous minimum≥ 3 mg/LJan, Feb, Mar, Apr, Nov, Dec002
pHminimum≥ 6 SUall year002
pHmaximum≤ 9 SUall year002
Solids, total suspendedmonthly average≤ 15 mg/Lall year002
Solids, total suspended7-day average≤ 22.5 mg/Lall year002
Solids, total suspendedmonthly average≤ 100.1 lb/dall year002
Nitrogen, ammonia total [as N]monthly average≤ 10 mg/LApr002
Nitrogen, ammonia total [as N]monthly average≤ 10 mg/LJan, Feb, Mar, Nov, Dec002
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/LMay–Oct002
Nitrogen, ammonia total [as N]7-day average≤ 10.5 mg/LApr002
Nitrogen, ammonia total [as N]7-day average≤ 15 mg/LJan, Feb, Mar, Nov, Dec002
Nitrogen, ammonia total [as N]7-day average≤ 3 mg/LMay–Oct002
Nitrogen, ammonia total [as N]monthly average≤ 66.7 lb/dApr002
Nitrogen, ammonia total [as N]monthly average≤ 66.7 lb/dJan, Feb, Mar, Nov, Dec002
Nitrogen, ammonia total [as N]monthly average≤ 13.3 lb/dMay–Oct002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Chlorine, total residualinstantaneous maximumreport only (mg/L)all year002
Coliform, fecal general30-day geometric mean≤ 200 #/100mLMay–Sep002
Coliform, fecal general30-day geometric mean≤ 1000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec002
Coliform, fecal general7-day geometric mean≤ 400 #/100mLMay–Sep002
Coliform, fecal general7-day geometric mean≤ 2000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec002
Overflowsmonthly totalreport only (occur/mo)all year002
Overflow volume [SS0 volume, CSO volume]monthly totalreport only (gal)all year002
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year002
BOD, carbonaceous [5 day, 20 C]7-day average≤ 15 mg/Lall year002
BOD, carbonaceous [5 day, 20 C]monthly average≤ 66.7 lb/dall year002

How strict are these limits?

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

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