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Mountainburg, City of

Sewage treatment plant, Mountainburg, Arkansas. NPDES permit AR0021512 expired Nov 30, 2025; its limits still apply. Last 12 months: over a limit 54 times (last August 2026), 4 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
26 values over a limit, 0 required values missing, 2 of 12 reports late

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

All 54 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, carbonaceous [5 day, 20 C], monthly average18.5 mg/L≤ 15 mg/L23%
October 2025Nitrogen, ammonia total [as N], 7-day average30 mg/L≤ 9 mg/L233%
October 2025Nitrogen, ammonia total [as N], monthly average28.5 mg/L≤ 6 mg/L375%
October 2025Oxygen, dissolved [DO], instantaneous minimum4.1 mg/L≥ 6 mg/L32%
October 2025Solids, total suspended, monthly average39.5 mg/L≤ 30 mg/L32%
November 2025BOD, 5-day, 20 deg. C, 7-day average53 mg/L≤ 45 mg/L18%
November 2025BOD, 5-day, 20 deg. C, monthly average38.5 mg/L≤ 30 mg/L28%
November 2025Solids, total suspended, 7-day average53 mg/L≤ 45 mg/L18%
November 2025Solids, total suspended, monthly average35.5 mg/L≤ 30 mg/L18%
December 2025BOD, 5-day, 20 deg. C, monthly average31.5 mg/L≤ 30 mg/L5%
December 2025Solids, total suspended, 7-day average70 mg/L≤ 45 mg/L56%
December 2025Solids, total suspended, monthly average47.5 mg/L≤ 30 mg/L58%
January 2026BOD, 5-day, 20 deg. C, 7-day average70 mg/L≤ 45 mg/L56%
January 2026BOD, 5-day, 20 deg. C, monthly average54.5 mg/L≤ 30 mg/L82%
January 2026Solids, total suspended, 7-day average60 mg/L≤ 45 mg/L33%
January 2026Solids, total suspended, monthly average54.5 mg/L≤ 30 mg/L82%
February 2026BOD, 5-day, 20 deg. C, 7-day average49 mg/L≤ 45 mg/L9%
February 2026BOD, 5-day, 20 deg. C, monthly average42 mg/L≤ 30 mg/L40%
February 2026Oxygen, dissolved [DO], instantaneous minimum2.1 mg/L≥ 4 mg/L48%
February 2026Solids, total suspended, monthly average30.5 mg/L≤ 30 mg/L2%
March 2026BOD, 5-day, 20 deg. C, 7-day average47 mg/L≤ 45 mg/L4%
March 2026BOD, 5-day, 20 deg. C, monthly average40.5 mg/L≤ 30 mg/L35%
March 2026Solids, total suspended, 7-day average67 mg/L≤ 45 mg/L49%
March 2026Solids, total suspended, monthly average52.5 mg/L≤ 30 mg/L75%
April 2026BOD, carbonaceous [5 day, 20 C], monthly average33 mg/L≤ 25 mg/L32%
April 2026Coliform, fecal general, 30-day geometric mean1081 #/100mL≤ 1000 #/100mL8%
April 2026Nitrogen, ammonia total [as N], 7-day average12.4 mg/L≤ 5.3 mg/L134%
April 2026Nitrogen, ammonia total [as N], monthly average10.29 mg/L≤ 5.3 mg/L94%
April 2026Solids, total suspended, 7-day average85 mg/L≤ 45 mg/L89%
April 2026Solids, total suspended, monthly average35.21 lb/d≤ 30 lb/d17%
April 2026Solids, total suspended, monthly average82 mg/L≤ 30 mg/L173%
May 2026BOD, carbonaceous [5 day, 20 C], monthly average20 mg/L≤ 15 mg/L33%
May 2026Nitrogen, ammonia total [as N], 7-day average14.6 mg/L≤ 9 mg/L62%
May 2026Nitrogen, ammonia total [as N], monthly average14.46 mg/L≤ 6 mg/L141%
May 2026Solids, total suspended, 7-day average61 mg/L≤ 45 mg/L36%
May 2026Solids, total suspended, monthly average55.5 mg/L≤ 30 mg/L85%
June 2026Coliform, fecal general, 30-day geometric mean2323 #/100mL≤ 1000 #/100mL132%
June 2026Coliform, fecal general, 7-day geometric mean2510 #/100mL≤ 2000 #/100mL26%
June 2026Nitrogen, ammonia total [as N], 7-day average9.87 mg/L≤ 9 mg/L10%
June 2026Nitrogen, ammonia total [as N], monthly average7.74 mg/L≤ 6 mg/L29%
June 2026Solids, total suspended, 7-day average86 mg/L≤ 45 mg/L91%
June 2026Solids, total suspended, monthly average32.27 lb/d≤ 30 lb/d8%
June 2026Solids, total suspended, monthly average69 mg/L≤ 30 mg/L130%
July 2026BOD, carbonaceous [5 day, 20 C], monthly average19 mg/L≤ 15 mg/L27%
July 2026Coliform, fecal general, 30-day geometric mean1255 #/100mL≤ 1000 #/100mL26%
July 2026Nitrogen, ammonia total [as N], 7-day average17 mg/L≤ 9 mg/L89%
July 2026Nitrogen, ammonia total [as N], monthly average16.16 mg/L≤ 6 mg/L169%
July 2026Oxygen, dissolved [DO], instantaneous minimum4.9 mg/L≥ 6 mg/L18%
August 2026Coliform, fecal general, 30-day geometric mean1045 #/100mL≤ 1000 #/100mL5%
August 2026Nitrogen, ammonia total [as N], 7-day average23.06 mg/L≤ 9 mg/L156%
August 2026Nitrogen, ammonia total [as N], monthly average25.79 mg/L≤ 6 mg/L330%
August 2026Oxygen, dissolved [DO], instantaneous minimum4.8 mg/L≥ 6 mg/L20%
August 2026Solids, total suspended, 7-day average66 mg/L≤ 45 mg/L47%
August 2026Solids, total suspended, monthly average44.5 mg/L≤ 30 mg/L48%

Limits in force (29)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 6 mg/LMay–Oct
Oxygen, dissolved [DO]instantaneous minimum≥ 4 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LJan, Feb, Mar, Nov, Dec
BOD, 5-day, 20 deg. C7-day average≤ 45 mg/LJan, Feb, Mar, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 30 lb/dJan, Feb, Mar, Nov, Dec
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 30 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 5.3 mg/LApr
Nitrogen, ammonia total [as N]monthly average≤ 6 mg/LMay–Oct
Nitrogen, ammonia total [as N]7-day average≤ 5.3 mg/LApr
Nitrogen, ammonia total [as N]7-day average≤ 9 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 5.3 lb/dApr
Nitrogen, ammonia total [as N]monthly average≤ 6 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≤ 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≤ 15 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/LApr
BOD, carbonaceous [5 day, 20 C]7-day average≤ 23 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]7-day average≤ 38 mg/LApr
BOD, carbonaceous [5 day, 20 C]monthly average≤ 15 lb/dMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 lb/dApr

How strict are these limits?

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

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