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Humphrey, City of

Sewage treatment plant, Humphrey, Arkansas. NPDES permit AR0022284, in force until Aug 31, 2027. Last 12 months: over a limit 53 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: form A monthly (19 values)
Renewal application due
Mar 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
100 values over a limit, 0 required values missing, 3 of 12 reports late

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

All 53 values over a limit
Period endingParameterReportedLimitOver by
November 2025BOD, carbonaceous [5 day, 20 C], 7-day average23.8 mg/L≤ 23 mg/L3%
November 2025BOD, carbonaceous [5 day, 20 C], monthly average23.2 mg/L≤ 15 mg/L55%
November 2025Chlorine, total residual, instantaneous maximum.2 mg/L≤ .011 mg/L1718%
November 2025Coliform, fecal general, 7-day geometric mean> 120980 #/100mL≤ 2000 #/100mL—
November 2025Oxygen, dissolved [DO], instantaneous minimum1.13 mg/L≥ 5 mg/L77%
November 2025Solids, total suspended, 7-day average40 mg/L≤ 23 mg/L74%
November 2025Solids, total suspended, monthly average35.2 mg/L≤ 15 mg/L135%
December 2025Coliform, fecal general, 7-day geometric mean> 2419.6 #/100mL≤ 2000 #/100mL—
December 2025Coliform, fecal general, monthly geometric mean> 2419.6 #/100mL≤ 1000 #/100mL—
December 2025Oxygen, dissolved [DO], instantaneous minimum1.6 mg/L≥ 5 mg/L68%
December 2025Solids, total suspended, 7-day average28 mg/L≤ 23 mg/L22%
December 2025Solids, total suspended, monthly average28 mg/L≤ 15 mg/L87%
January 2026BOD, carbonaceous [5 day, 20 C], 7-day average24 mg/L≤ 23 mg/L4%
January 2026Chlorine, total residual, instantaneous maximum.55 mg/L≤ .011 mg/L4900%
January 2026Coliform, fecal general, 7-day geometric mean> 4839.2 #/100mL≤ 2000 #/100mL—
January 2026Oxygen, dissolved [DO], instantaneous minimum1.23 mg/L≥ 5 mg/L75%
February 2026Chlorine, total residual, instantaneous maximum.04 mg/L≤ .011 mg/L264%
February 2026Coliform, fecal general, 7-day geometric mean> 60490 #/100mL≤ 2000 #/100mL—
February 2026Coliform, fecal general, monthly geometric mean5213.8 #/100mL≤ 1000 #/100mL421%
February 2026Solids, total suspended, 7-day average50 mg/L≤ 23 mg/L117%
February 2026Solids, total suspended, monthly average26.5 lb/d≤ 12.5 lb/d112%
February 2026Solids, total suspended, monthly average52.5 mg/L≤ 15 mg/L250%
March 2026BOD, carbonaceous [5 day, 20 C], 7-day average55.8 mg/L≤ 23 mg/L143%
March 2026BOD, carbonaceous [5 day, 20 C], monthly average32.4 lb/d≤ 12.5 lb/d159%
March 2026BOD, carbonaceous [5 day, 20 C], monthly average35.5 mg/L≤ 15 mg/L137%
March 2026Chlorine, total residual, instantaneous maximum1.08 mg/L≤ .011 mg/L9718%
March 2026Coliform, fecal general, 7-day geometric mean> 137340 #/100mL≤ 2000 #/100mL—
March 2026Coliform, fecal general, monthly geometric mean128900.7 #/100mL≤ 1000 #/100mL12790%
March 2026Oxygen, dissolved [DO], instantaneous minimum1.8 mg/L≥ 5 mg/L64%
March 2026Solids, total suspended, 7-day average343 mg/L≤ 23 mg/L1391%
March 2026Solids, total suspended, monthly average190.5 mg/L≤ 15 mg/L1170%
March 2026Solids, total suspended, monthly average198.9 lb/d≤ 12.5 lb/d1491%
April 2026Chlorine, total residual, instantaneous maximum.03 mg/L≤ .011 mg/L173%
April 2026Coliform, fecal general, 7-day geometric mean2400 #/100mL≤ 2000 #/100mL20%
April 2026Coliform, fecal general, monthly geometric mean2400 #/100mL≤ 1000 #/100mL140%
April 2026Oxygen, dissolved [DO], instantaneous minimum2.86 mg/L≥ 5 mg/L43%
April 2026Solids, total suspended, 7-day average31 mg/L≤ 23 mg/L35%
April 2026Solids, total suspended, monthly average24.5 mg/L≤ 15 mg/L63%
May 2026Coliform, fecal general, 7-day geometric mean3500 #/100mL≤ 2000 #/100mL75%
May 2026Coliform, fecal general, monthly geometric mean3500 #/100mL≤ 1000 #/100mL250%
May 2026Nitrogen, ammonia total [as N], 7-day average11 mg/L≤ 6 mg/L83%
May 2026Nitrogen, ammonia total [as N], monthly average11 mg/L≤ 4 mg/L175%
May 2026Oxygen, dissolved [DO], instantaneous minimum1.47 mg/L≥ 5 mg/L71%
May 2026Solids, total suspended, 7-day average59 mg/L≤ 23 mg/L157%
May 2026Solids, total suspended, monthly average59 mg/L≤ 15 mg/L293%
June 2026BOD, carbonaceous [5 day, 20 C], monthly average18.5 mg/L≤ 15 mg/L23%
June 2026Coliform, fecal general, 7-day geometric mean> 4800 #/100mL≤ 2000 #/100mL—
June 2026Coliform, fecal general, monthly geometric mean> 4800 #/100mL≤ 1000 #/100mL—
June 2026Nitrogen, ammonia total [as N], 7-day average26 mg/L≤ 6 mg/L333%
June 2026Nitrogen, ammonia total [as N], monthly average24 mg/L≤ 4 mg/L500%
June 2026Oxygen, dissolved [DO], instantaneous minimum1.28 mg/L≥ 5 mg/L74%
June 2026Solids, total suspended, 7-day average170 mg/L≤ 23 mg/L639%
June 2026Solids, total suspended, monthly average113 mg/L≤ 15 mg/L653%

Limits in force (25)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/Lall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 15 mg/Lall year
Solids, total suspended7-day average≤ 23 mg/Lall year
Solids, total suspendedmonthly average≤ 12.5 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 4 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 10 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 5.2 mg/LApr
Nitrogen, ammonia total [as N]7-day average≤ 6 mg/LMay–Oct
Nitrogen, ammonia total [as N]7-day average≤ 14.7 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]7-day average≤ 5.2 mg/LApr
Nitrogen, ammonia total [as N]monthly average≤ 3.3 lb/dMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 8.3 lb/dJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 4.3 lb/dApr
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 generalmonthly 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/Lall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 23 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 12.5 lb/dall year

How strict are these limits?

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

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