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Amagon, City of

Sewage treatment plant, Amagon, Arkansas. NPDES permit AR0046604 expired Apr 30, 2025; its limits still apply. Last 12 months: over a limit 10 times (last July 2026), 9 of 19 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: form A monthly (4 values), form Q quarterly (11 values), form F quarterly
Last report on file
August 2026
Oct 2024 – Sep 2025
7 values over a limit, 4 required values missing, 10 of 21 reports late

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

Period endingParameterReportedLimitOver by
March 2026Coliform, fecal general, 30-day geometric mean1476 #/100mL≤ 1000 #/100mL48%
March 2026Nitrogen, ammonia total [as N], 7-day average21.7 mg/L≤ 14.7 mg/L48%
March 2026Nitrogen, ammonia total [as N], monthly average21.7 mg/L≤ 12 mg/L81%
April 2026Nitrogen, ammonia total [as N], 7-day average6 mg/L≤ 5.2 mg/L15%
April 2026Nitrogen, ammonia total [as N], monthly average6 mg/L≤ 5.2 mg/L15%
April 2026Oxygen, dissolved [DO], instantaneous minimum1.2 mg/L≥ 2 mg/L40%
June 2026Coliform, fecal general, 30-day geometric mean1264 #/100mL≤ 1000 #/100mL26%
July 2026Nitrogen, ammonia total [as N], 7-day average16.5 mg/L≤ 7.5 mg/L120%
July 2026Nitrogen, ammonia total [as N], monthly average16.5 mg/L≤ 5 mg/L230%
July 2026Oxygen, dissolved [DO], instantaneous minimum2.6 mg/L≥ 3 mg/L13%

Limits in force (26)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 3 mg/LMay–Oct
Oxygen, dissolved [DO]instantaneous minimum≥ 2 mg/LJan, Feb, Mar, Apr, Nov, Dec
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 20 mg/Lall year
Solids, total suspended7-day average≤ 30 mg/Lall year
Solids, total suspendedmonthly average≤ 2.7 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 5.2 mg/LApr
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 12 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]7-day average≤ 5.2 mg/LApr
Nitrogen, ammonia total [as N]7-day average≤ 7.5 mg/LMay–Oct
Nitrogen, ammonia total [as N]7-day average≤ 14.7 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ .7 lb/dApr
Nitrogen, ammonia total [as N]monthly average≤ .7 lb/dMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 1.6 lb/dJan, Feb, Mar, Nov, Dec
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
Coliform, fecal general30-day geometric mean≤ 1000 #/100mLall year
Coliform, fecal general7-day geometric mean≤ 2000 #/100mLall year
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≤ 20 mg/Lall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 30 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 2.7 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/AR0046604 · MCP: https://passage-data.com/mcp