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Sulphur Springs, City of

Sewage treatment plant, Sulphur Springs, Arkansas. NPDES permit AR0051179 expired Sep 30, 2026; its limits still apply. Last 12 months: over a limit 15 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: form A monthly (27 values), form B monthly (25 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
14 values over a limit, 0 required values missing, 11 of 24 reports late

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

All 15 values over a limit
Period endingParameterReportedLimitOver by
October 2025Chlorine, total residual, instantaneous maximum13.8 mg/L≤ .06 mg/L22900%
November 2025Chlorine, total residual, instantaneous maximum.75 mg/L≤ .06 mg/L1150%
December 2025Chlorine, total residual, instantaneous maximum9.4 mg/L≤ .06 mg/L15567%
January 2026Chlorine, total residual, instantaneous maximum21.6 mg/L≤ .06 mg/L35900%
February 2026Chlorine, total residual, instantaneous maximum3.7 mg/L≤ .06 mg/L6067%
March 2026Chlorine, total residual, instantaneous maximum.34 mg/L≤ .06 mg/L467%
April 2026Chlorine, total residual, instantaneous maximum.11 mg/L≤ .06 mg/L83%
May 2026Chlorine, total residual, instantaneous maximum.52 mg/L≤ .06 mg/L767%
June 2026Chlorine, total residual, instantaneous maximum.13 mg/L≤ .06 mg/L117%
June 2026Coliform, fecal general, 7-day geometric mean2420 #/100mL≤ 400 #/100mL505%
June 2026Coliform, fecal general, monthly geometric mean2420 #/100mL≤ 200 #/100mL1110%
July 2026Chlorine, total residual, instantaneous maximum.33 mg/L≤ .06 mg/L450%
July 2026Coliform, fecal general, 7-day geometric mean7270 #/100mL≤ 400 #/100mL1718%
July 2026Coliform, fecal general, monthly geometric mean7270 #/100mL≤ 200 #/100mL3535%
August 2026Chlorine, total residual, instantaneous maximum.14 mg/L≤ .06 mg/L133%

Limits in force (62)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 2 mg/LJan, Feb, Mar, Apr, Nov, Dec
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/LMay–Oct
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/LMay–Oct
Oxygen, dissolved [DO]instantaneous minimum≥ 2 mg/LJan, Feb, Mar, Apr, Nov, Dec
pHminimum≥ 6 SUall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 15 mg/Lall year
Solids, total suspendedmonthly average≤ 15 mg/Lall year
Solids, total suspended7-day average≤ 22.5 mg/Lall year
Solids, total suspendeddaily maximum≤ 22.5 mg/Lall year
Solids, total suspendedmonthly average≤ 12.5 lb/dall year
Solids, total suspendedmonthly average≤ 12.5 lb/dall year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]7-day averagereport only (mg/L)all year
Nitrogen, total [as N]7-day averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]monthly average≤ 3.9 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 8 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 3.9 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 8 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]7-day average≤ 5.9 mg/LMay–Oct
Nitrogen, ammonia total [as N]7-day average≤ 12 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 5.9 mg/LMay–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 12 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 3.3 lb/dMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 6.7 lb/dJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 3.3 lb/dMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 6.7 lb/dJan, Feb, Mar, Apr, Nov, Dec
Nitrite + Nitrate total [as N]instantaneous maximum≤ 10 mg/Lall year
Nitrite + Nitrate total [as N]monthly averagereport only (lb/d)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]7-day averagereport only (mg/L)all year
Phosphorus, total [as P]7-day averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all 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
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualinstantaneous maximum≤ .06 mg/Lall year
Chlorine, total residualinstantaneous maximum≤ .06 mg/Lall year
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLMay–Sep
Coliform, fecal generalmonthly geometric mean≤ 1000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
Coliform, fecal general7-day geometric mean≤ 400 #/100mLall year
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
Overflowsmonthly totalreport only (occur/mo)all year
Overflow volume [SS0 volume, CSO volume]monthly totalreport only (gal)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]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]daily maximum≤ 15 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 8.3 lb/dall 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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