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London, City of - London Pollution Control Facility

Sewage treatment plant, London, Arkansas. NPDES permit AR0050946, in force until Nov 30, 2028. Last 12 months: over a limit 19 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: form A monthly (23 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
33 values over a limit, 0 required values missing, 0 of 12 reports late

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

All 19 values over a limit
Period endingParameterReportedLimitOver by
October 2025Coliform, fecal general, 30-day geometric mean> 4405.1 #/100mL≤ 1000 #/100mL—
October 2025Coliform, fecal general, 7-day geometric mean> 24196 #/100mL≤ 2000 #/100mL—
November 2025Coliform, fecal general, 7-day geometric mean3635 #/100mL≤ 2000 #/100mL82%
December 2025BOD, carbonaceous [5 day, 20 C], 7-day average19.9 mg/L≤ 15 mg/L33%
December 2025BOD, carbonaceous [5 day, 20 C], monthly average13.55 mg/L≤ 10 mg/L36%
December 2025Solids, total suspended, monthly average15.4 mg/L≤ 15 mg/L3%
January 2026Coliform, fecal general, 7-day geometric mean> 2419.6 #/100mL≤ 2000 #/100mL—
March 2026BOD, carbonaceous [5 day, 20 C], 7-day average19.8 mg/L≤ 15 mg/L32%
March 2026BOD, carbonaceous [5 day, 20 C], monthly average11.8 mg/L≤ 10 mg/L18%
May 2026Coliform, fecal general, 30-day geometric mean819.1 #/100mL≤ 200 #/100mL310%
May 2026Coliform, fecal general, 7-day geometric mean1100 #/100mL≤ 400 #/100mL175%
June 2026Coliform, fecal general, 30-day geometric mean> 2400 #/100mL≤ 200 #/100mL—
June 2026Coliform, fecal general, 7-day geometric mean> 2400 #/100mL≤ 400 #/100mL—
July 2026Coliform, fecal general, 30-day geometric mean693 #/100mL≤ 200 #/100mL247%
July 2026Coliform, fecal general, 7-day geometric mean> 2400 #/100mL≤ 400 #/100mL—
August 2026Coliform, fecal general, 30-day geometric mean> 2400 #/100mL≤ 200 #/100mL—
August 2026Coliform, fecal general, 7-day geometric mean> 2400 #/100mL≤ 400 #/100mL—
August 2026Solids, total suspended, 7-day average23 mg/L≤ 22.5 mg/L2%
August 2026Solids, total suspended, monthly average21.5 mg/L≤ 15 mg/L43%

Limits in force (28)

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≤ 22.5 mg/Lall year
Solids, total suspendedmonthly average≤ 25 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 3.2 mg/LApr–Oct
Nitrogen, ammonia total [as N]monthly average≤ 10 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]7-day average≤ 3.2 mg/LApr–Oct
Nitrogen, ammonia total [as N]7-day average≤ 10.3 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 5.3 lb/dApr–Oct
Nitrogen, ammonia total [as N]monthly average≤ 16.7 lb/dJan, Feb, Mar, Nov, Dec
Phosphorus, total [as P]monthly average≤ 1 mg/Lall year
Phosphorus, total [as P]7-day average≤ 1.5 mg/Lall year
Phosphorus, total [as P]monthly average≤ 1.7 lb/dall 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
Chlorine, total residualinstantaneous maximumreport only (mg/L)all year
Peracetic Acidinstantaneous maximum≤ 2 mg/Lall year
Coliform, fecal general30-day geometric mean≤ 1000 #/100mLJan, Feb, Mar, Oct, Nov, Dec
Coliform, fecal general30-day geometric mean≤ 200 #/100mLApr–Sep
Coliform, fecal general7-day geometric mean≤ 2000 #/100mLJan, Feb, Mar, Oct, Nov, Dec
Coliform, fecal general7-day geometric mean≤ 400 #/100mLApr–Sep
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≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 15 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 16.7 lb/dall year

New limits from Dec 1, 2026

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Chlorine, total residual, instantaneous maximum0.14 mg/Lnew——

How strict are these limits?

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/AR0050946 · MCP: https://passage-data.com/mcp