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Norman, City of

Sewage treatment plant, Norman, Arkansas. NPDES permit AR0043125 expired Aug 31, 2025; its limits still apply. Last 12 months: over a limit 2 times (last March 2026), 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

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

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

Period endingParameterReportedLimitOver by
March 2026BOD, carbonaceous [5 day, 20 C], 7-day average29.4 mg/L≤ 15 mg/L96%
March 2026BOD, carbonaceous [5 day, 20 C], monthly average15.7 mg/L≤ 10 mg/L57%

Limits in force (23)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 2 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≤ 13 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 10 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/LMay–Oct
Nitrogen, ammonia total [as N]7-day average≤ 15 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]7-day average≤ 7.5 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 8.3 lb/dJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 4.2 lb/dMay–Oct
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
E. coli30-day geometric mean≤ 630 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
E. coli30-day geometric mean≤ 126 #/100mLMay–Sep
E. coli7-day geometric mean≤ 1490 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
E. coli7-day geometric mean≤ 298 #/100mLMay–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≤ 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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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/AR0043125 · MCP: https://passage-data.com/mcp