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Eureka Springs, City of

Sewage treatment plant, Eureka Springs, Arkansas. NPDES permit AR0021865, in force until Dec 31, 2030. Last 12 months: over a limit 10 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: form A monthly (24 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 1 of 12 reports late

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

Period endingParameterReportedLimitOver by
January 2026E. coli, 30-day geometric mean≤ 25163.84 #/100mL≤ 126 #/100mL19871%
January 2026E. coli, 7-day geometric mean≤ 2419.6 #/100mL≤ 410 #/100mL490%
February 2026E. coli, 7-day geometric mean≤ 4839 #/100mL≤ 410 #/100mL1080%
June 2026BOD, carbonaceous [5 day, 20 C], 7-day average< 32 mg/L≤ 15 mg/L113%
June 2026BOD, carbonaceous [5 day, 20 C], monthly average< 12 mg/L≤ 10 mg/L20%
June 2026BOD, carbonaceous [5 day, 20 C], monthly average< 76.1 lb/d≤ 75.1 lb/d1%
June 2026Nitrogen, ammonia total [as N], 7-day average13 mg/L≤ 3.8 mg/L242%
June 2026Nitrogen, ammonia total [as N], monthly average30.4 lb/d≤ 18.8 lb/d62%
June 2026Nitrogen, ammonia total [as N], monthly average4.71 mg/L≤ 2.5 mg/L88%
August 2026Nitrogen, ammonia total [as N], 7-day average3.9 mg/L≤ 3.8 mg/L3%

Limits in force (30)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 6.5 mg/Lall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 15 mg/Lall year
Solids, total suspended7-day average≤ 23 mg/Lall year
Solids, total suspendedmonthly average≤ 112.6 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 2.5 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 3.9 mg/LApr
Nitrogen, ammonia total [as N]7-day average≤ 3.8 mg/LMay–Oct
Nitrogen, ammonia total [as N]7-day average≤ 7.5 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]7-day average≤ 3.9 mg/LApr
Nitrogen, ammonia total [as N]monthly average≤ 18.8 lb/dMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 37.6 lb/dJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 29.3 lb/dApr
Nitrite + Nitrate total [as N]monthly average≤ 10 mg/Lall year
Nitrite + Nitrate total [as N]7-day average≤ 10 mg/Lall year
Nitrite + Nitrate total [as N]monthly average≤ 75.1 lb/dall year
Phosphorus, total [as P]6-month average≤ .5 mg/Lall year
Phosphorus, total [as P]7-day average≤ 1.56 mg/Lall year
Phosphorus, total [as P]monthly average≤ 3.8 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
E. coli30-day geometric mean≤ 126 #/100mLall year
E. coli7-day geometric mean≤ 410 #/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≤ 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≤ 75.1 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/AR0021865 · MCP: https://passage-data.com/mcp