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Norphlet, City of - Norphlet Wastewater Treatment System

Sewage treatment plant, Norphlet, Arkansas. NPDES permit AR0035653, in force until Feb 28, 2029. Last 12 months: over a limit 32 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form A monthly (28 values), outfall 002 form A monthly (19 values), outfall 002 form Q quarterly (2 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
24 values over a limit, 0 required values missing, 0 of 28 reports late

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

All 32 values over a limit
Period endingParameterReportedLimitOver by
October 2025Chloride [as Cl], 7-day average135 mg/L≤ 105 mg/L29%
October 2025Chloride [as Cl], monthly average121.5 mg/L≤ 70 mg/L74%
October 2025Nitrogen, ammonia total [as N], 7-day average4.76 mg/L≤ 3.65 mg/L30%
October 2025Nitrogen, ammonia total [as N], monthly average4.25 mg/L≤ 2.43 mg/L75%
November 2025Chloride [as Cl], 7-day average121 mg/L≤ 105 mg/L15%
November 2025Chloride [as Cl], monthly average118.5 mg/L≤ 70 mg/L69%
December 2025Chloride [as Cl], 7-day average113 mg/L≤ 105 mg/L8%
December 2025Chloride [as Cl], monthly average111.5 mg/L≤ 70 mg/L59%
January 2026Chloride [as Cl], 7-day average119 mg/L≤ 105 mg/L13%
January 2026Chloride [as Cl], monthly average117.5 mg/L≤ 70 mg/L68%
February 2026Chloride [as Cl], 7-day average117 mg/L≤ 105 mg/L11%
February 2026Chloride [as Cl], monthly average116 mg/L≤ 70 mg/L66%
March 2026Chloride [as Cl], monthly average102.15 mg/L≤ 70 mg/L46%
April 2026Chloride [as Cl], 7-day average117 mg/L≤ 105 mg/L11%
April 2026Chloride [as Cl], monthly average117 mg/L≤ 70 mg/L67%
May 2026Chloride [as Cl], 7-day average142 mg/L≤ 105 mg/L35%
May 2026Chloride [as Cl], monthly average134 mg/L≤ 70 mg/L91%
May 2026Nitrogen, ammonia total [as N], 7-day average4.05 mg/L≤ 3.65 mg/L11%
May 2026Nitrogen, ammonia total [as N], monthly average3.69 mg/L≤ 2.43 mg/L52%
June 2026Chloride [as Cl], 7-day average124 mg/L≤ 105 mg/L18%
June 2026Chloride [as Cl], monthly average124 mg/L≤ 70 mg/L77%
June 2026Nitrogen, ammonia total [as N], 7-day average9.7 mg/L≤ 3.65 mg/L166%
June 2026Nitrogen, ammonia total [as N], monthly average9.7 mg/L≤ 2.43 mg/L299%
July 2026Chloride [as Cl], 7-day average122 mg/L≤ 105 mg/L16%
July 2026Chloride [as Cl], monthly average122 mg/L≤ 70 mg/L74%
July 2026Nitrogen, ammonia total [as N], 7-day average9.9 mg/L≤ 3.65 mg/L171%
July 2026Nitrogen, ammonia total [as N], monthly average9.9 mg/L≤ 2.43 mg/L307%
August 2026Chloride [as Cl], 7-day average184 mg/L≤ 105 mg/L75%
August 2026Chloride [as Cl], monthly average184 mg/L≤ 70 mg/L163%
August 2026Nitrogen, ammonia total [as N], 7-day average6.34 mg/L≤ 3.65 mg/L74%
August 2026Nitrogen, ammonia total [as N], monthly average6.34 mg/L≤ 2.43 mg/L161%
August 2026Solids, total dissolved, monthly average525 mg/L≤ 500 mg/L5%

Limits in force (64)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 2 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Oxygen, dissolved [DO]instantaneous minimum≥ 3 mg/LMay–Oct001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspended7-day average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 45 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 2.43 mg/LMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 17 mg/LJan, Feb, Mar, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 6.1 mg/LApr001
Nitrogen, ammonia total [as N]7-day average≤ 3.65 mg/LMay–Oct001
Nitrogen, ammonia total [as N]7-day average≤ 17 mg/LJan, Feb, Mar, Nov, Dec001
Nitrogen, ammonia total [as N]7-day average≤ 6.1 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 3.65 lb/dMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 25.5 lb/dJan, Feb, Mar, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 9.2 lb/dApr001
Chloride [as Cl]monthly average≤ 70 mg/Lall year001
Chloride [as Cl]7-day average≤ 105 mg/Lall year001
Chloride [as Cl]monthly average≤ 105 lb/dall year001
Sulfate, total [as SO4]monthly average≤ 45 mg/Lall year001
Sulfate, total [as SO4]7-day average≤ 67.5 mg/Lall year001
Sulfate, total [as SO4]monthly average≤ 68 lb/dall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualinstantaneous maximumreport only (mg/L)all year001
Solids, total dissolvedmonthly average≤ 500 mg/Lall year001
Solids, total dissolved7-day average≤ 750 mg/Lall year001
Solids, total dissolvedmonthly average≤ 751 lb/dall year001
Coliform, fecal general30-day geometric mean≤ 1000 #/100mLall year001
Coliform, fecal general7-day geometric mean≤ 2000 #/100mLall year001
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≤ 20 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]7-day average≤ 30 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 30 lb/dall year001
Oxygen, dissolved [DO]instantaneous minimum≥ 2 mg/Lall year002
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LJan, Feb, Mar, Nov, Dec002
BOD, 5-day, 20 deg. C7-day average≤ 45 mg/LJan, Feb, Mar, Nov, Dec002
BOD, 5-day, 20 deg. Cmonthly average≤ 45 lb/dJan, Feb, Mar, Nov, Dec002
pHminimum≥ 6 SUall year002
pHmaximum≤ 9 SUall year002
Solids, total suspendedmonthly average≤ 30 mg/Lall year002
Solids, total suspended7-day average≤ 45 mg/Lall year002
Solids, total suspendedmonthly average≤ 45 lb/dall year002
Nitrogen, ammonia total [as N]monthly average≤ 10.3 mg/LMay–Oct002
Nitrogen, ammonia total [as N]monthly average≤ 11.1 mg/LApr002
Nitrogen, ammonia total [as N]7-day average≤ 11.1 mg/LMay–Oct002
Nitrogen, ammonia total [as N]7-day average≤ 11.1 mg/LApr002
Nitrogen, ammonia total [as N]monthly average≤ 15.5 lb/dMay–Oct002
Nitrogen, ammonia total [as N]monthly average≤ 16.7 lb/dApr002
Lead, total recoverablemonthly averagereport only (ug/L)all year002
Lead, total recoverable7-day averagereport only (ug/L)all year002
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≤ 25 mg/LApr–Oct002
BOD, carbonaceous [5 day, 20 C]7-day average≤ 38 mg/LApr–Oct002
BOD, carbonaceous [5 day, 20 C]monthly average≤ 37.5 lb/dApr–Oct002

New limits from Mar 1, 2027

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Chlorine, total residual, instantaneous maximum outfall 0010.011 mg/Lnew0.15 mg/L (11 values)13.6×
Chlorine, total residual, instantaneous maximum outfall 0020.02 mg/Lnew——

How strict are these limits?

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

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Your permit document is the final word. As JSON: /api/v1/permits/AR0035653 · MCP: https://passage-data.com/mcp