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Sulphur Rock, City of

Sewage treatment plant, Sulphur Rock, Arkansas. NPDES permit AR0046680, in force until Jan 31, 2030. Last 12 months: over a limit 78 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: form A monthly (18 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
67 values over a limit, 0 required values missing, 1 of 12 reports late

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

All 78 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, carbonaceous [5 day, 20 C], 7-day average25.4 mg/L≤ 15 mg/L69%
October 2025BOD, carbonaceous [5 day, 20 C], monthly average25.4 mg/L≤ 10 mg/L154%
October 2025Coliform, fecal general, 30-day geometric mean> 2000 #/100mL≤ 1000 #/100mL—
October 2025Coliform, fecal general, 7-day geometric mean> 2000 #/100mL≤ 2000 #/100mL—
October 2025Nitrogen, ammonia total [as N], 7-day average37.7 mg/L≤ 7.5 mg/L403%
October 2025Nitrogen, ammonia total [as N], monthly average37.7 mg/L≤ 5 mg/L654%
October 2025Solids, total suspended, 7-day average127 mg/L≤ 22.5 mg/L464%
October 2025Solids, total suspended, monthly average127 mg/L≤ 15 mg/L747%
November 2025BOD, carbonaceous [5 day, 20 C], 7-day average74.3 mg/L≤ 23 mg/L223%
November 2025BOD, carbonaceous [5 day, 20 C], monthly average74.3 mg/L≤ 15 mg/L395%
November 2025Coliform, fecal general, 30-day geometric mean> 2000 #/100mL≤ 1000 #/100mL—
November 2025Coliform, fecal general, 7-day geometric mean> 2000 #/100mL≤ 2000 #/100mL—
November 2025Nitrogen, ammonia total [as N], 7-day average47.5 mg/L≤ 15 mg/L217%
November 2025Nitrogen, ammonia total [as N], monthly average47.5 mg/L≤ 10 mg/L375%
November 2025Oxygen, dissolved [DO], instantaneous minimum2.9 mg/L≥ 6 mg/L52%
November 2025Solids, total suspended, 7-day average118 mg/L≤ 30 mg/L293%
November 2025Solids, total suspended, monthly average118 mg/L≤ 20 mg/L490%
December 2025Nitrogen, ammonia total [as N], monthly average12.8 mg/L≤ 10 mg/L28%
January 2026Solids, total suspended, monthly average24 mg/L≤ 20 mg/L20%
March 2026BOD, carbonaceous [5 day, 20 C], 7-day average26.1 mg/L≤ 23 mg/L13%
March 2026BOD, carbonaceous [5 day, 20 C], monthly average26.1 mg/L≤ 15 mg/L74%
March 2026Coliform, fecal general, 30-day geometric mean> 2000 #/100mL≤ 1000 #/100mL—
March 2026Coliform, fecal general, 7-day geometric mean> 2000 #/100mL≤ 2000 #/100mL—
March 2026Nitrogen, ammonia total [as N], 7-day average40.6 mg/L≤ 15 mg/L171%
March 2026Nitrogen, ammonia total [as N], monthly average40.6 mg/L≤ 10 mg/L306%
March 2026Oxygen, dissolved [DO], instantaneous minimum4.82 mg/L≥ 6 mg/L20%
March 2026Solids, total suspended, 7-day average43 mg/L≤ 30 mg/L43%
March 2026Solids, total suspended, monthly average43 mg/L≤ 20 mg/L115%
April 2026BOD, carbonaceous [5 day, 20 C], 7-day average34 mg/L≤ 23 mg/L48%
April 2026BOD, carbonaceous [5 day, 20 C], monthly average27.89 lb/d≤ 9.4 lb/d197%
April 2026BOD, carbonaceous [5 day, 20 C], monthly average34 mg/L≤ 15 mg/L127%
April 2026Coliform, fecal general, 30-day geometric mean> 2000 #/100mL≤ 1000 #/100mL—
April 2026Coliform, fecal general, 7-day geometric mean> 2000 #/100mL≤ 2000 #/100mL—
April 2026Nitrogen, ammonia total [as N], 7-day average15.6 mg/L≤ 9.7 mg/L61%
April 2026Nitrogen, ammonia total [as N], monthly average12.8 lb/d≤ 6.1 lb/d110%
April 2026Nitrogen, ammonia total [as N], monthly average15.6 mg/L≤ 9.7 mg/L61%
April 2026Oxygen, dissolved [DO], instantaneous minimum4.01 mg/L≥ 6 mg/L33%
April 2026Solids, total suspended, 7-day average57 mg/L≤ 30 mg/L90%
April 2026Solids, total suspended, monthly average46.75 lb/d≤ 12.5 lb/d274%
April 2026Solids, total suspended, monthly average57 mg/L≤ 20 mg/L185%
May 2026BOD, carbonaceous [5 day, 20 C], 7-day average102.8 mg/L≤ 15 mg/L585%
May 2026BOD, carbonaceous [5 day, 20 C], monthly average102.8 mg/L≤ 10 mg/L928%
May 2026BOD, carbonaceous [5 day, 20 C], monthly average14.82 lb/d≤ 6.3 lb/d135%
May 2026Coliform, fecal general, 30-day geometric mean> 2000 #/100mL≤ 200 #/100mL—
May 2026Coliform, fecal general, 7-day geometric mean> 2000 #/100mL≤ 400 #/100mL—
May 2026Nitrogen, ammonia total [as N], 7-day average32.9 mg/L≤ 7.5 mg/L339%
May 2026Nitrogen, ammonia total [as N], monthly average32.9 mg/L≤ 5 mg/L558%
May 2026Nitrogen, ammonia total [as N], monthly average4.74 lb/d≤ 3.1 lb/d53%
May 2026Solids, total suspended, 7-day average85 mg/L≤ 22.5 mg/L278%
May 2026Solids, total suspended, monthly average12.25 lb/d≤ 9.4 lb/d30%
May 2026Solids, total suspended, monthly average85 mg/L≤ 15 mg/L467%
June 2026BOD, carbonaceous [5 day, 20 C], 7-day average42.4 mg/L≤ 15 mg/L183%
June 2026BOD, carbonaceous [5 day, 20 C], monthly average42.4 mg/L≤ 10 mg/L324%
June 2026BOD, carbonaceous [5 day, 20 C], monthly average8.13 lb/d≤ 6.3 lb/d29%
June 2026Coliform, fecal general, 30-day geometric mean> 2000 #/100mL≤ 200 #/100mL—
June 2026Coliform, fecal general, 7-day geometric mean> 2000 #/100mL≤ 400 #/100mL—
June 2026Nitrogen, ammonia total [as N], 7-day average19.8 mg/L≤ 7.5 mg/L164%
June 2026Nitrogen, ammonia total [as N], monthly average19.8 mg/L≤ 5 mg/L296%
June 2026Nitrogen, ammonia total [as N], monthly average3.8 lb/d≤ 3.1 lb/d23%
June 2026Solids, total suspended, 7-day average46 mg/L≤ 22.5 mg/L104%
June 2026Solids, total suspended, monthly average46 mg/L≤ 15 mg/L207%
July 2026BOD, carbonaceous [5 day, 20 C], 7-day average89.3 mg/L≤ 15 mg/L495%
July 2026BOD, carbonaceous [5 day, 20 C], monthly average89.3 mg/L≤ 10 mg/L793%
July 2026Coliform, fecal general, 30-day geometric mean2300 #/100mL≤ 200 #/100mL1050%
July 2026Coliform, fecal general, 7-day geometric mean2300 #/100mL≤ 400 #/100mL475%
July 2026Nitrogen, ammonia total [as N], 7-day average37.7 mg/L≤ 7.5 mg/L403%
July 2026Nitrogen, ammonia total [as N], monthly average37.7 mg/L≤ 5 mg/L654%
July 2026Solids, total suspended, 7-day average83 mg/L≤ 22.5 mg/L269%
July 2026Solids, total suspended, monthly average83 mg/L≤ 15 mg/L453%
August 2026BOD, carbonaceous [5 day, 20 C], 7-day average81 mg/L≤ 15 mg/L440%
August 2026BOD, carbonaceous [5 day, 20 C], monthly average81 mg/L≤ 10 mg/L710%
August 2026Coliform, fecal general, 30-day geometric mean> 2000 #/100mL≤ 200 #/100mL—
August 2026Coliform, fecal general, 7-day geometric mean> 2000 #/100mL≤ 400 #/100mL—
August 2026Nitrogen, ammonia total [as N], 7-day average41.2 mg/L≤ 7.5 mg/L449%
August 2026Nitrogen, ammonia total [as N], monthly average41.2 mg/L≤ 5 mg/L724%
August 2026Solids, total suspended, 7-day average146 mg/L≤ 22.5 mg/L549%
August 2026Solids, total suspended, monthly average146 mg/L≤ 15 mg/L873%
August 2026Solids, total suspended, monthly average9.74 lb/d≤ 9.4 lb/d4%

Limits in force (33)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 6 mg/LJan, Feb, Mar, Apr, Nov, Dec
Oxygen, dissolved [DO]instantaneous minimum≥ 3 mg/LMay–Oct
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 15 mg/LMay–Oct
Solids, total suspendedmonthly average≤ 20 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspended7-day average≤ 22.5 mg/LMay–Oct
Solids, total suspended7-day average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedmonthly average≤ 9.4 lb/dMay–Oct
Solids, total suspendedmonthly average≤ 12.5 lb/dJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 10 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 9.7 mg/LApr
Nitrogen, ammonia total [as N]7-day average≤ 7.5 mg/LMay–Oct
Nitrogen, ammonia total [as N]7-day average≤ 15 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]7-day average≤ 9.7 mg/LApr
Nitrogen, ammonia total [as N]monthly average≤ 3.1 lb/dMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 6.3 lb/dJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 6.1 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
Coliform, fecal general30-day geometric mean≤ 200 #/100mLMay–Sep
Coliform, fecal general30-day geometric mean≤ 1000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
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
Overflow volume [SS0 volume, CSO volume]monthly totalreport only (gal)all year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 15 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]7-day average≤ 23 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]7-day average≤ 15 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 9.4 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 6.3 lb/dMay–Oct

How strict are these limits?

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

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