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Strong, City of

Sewage treatment plant, Strong, Arkansas. NPDES permit AR0021687 expired Aug 31, 2024; its limits still apply. Last 12 months: over a limit 2 times (last February 2026), 15 required values missing, 6 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: form A monthly (19 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
4 values over a limit, 0 required values missing, 2 of 12 reports late

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

Period endingParameterReportedLimitOver by
January 2026Oxygen, dissolved [DO], instantaneous minimum4.31 mg/L≥ 5 mg/L14%
February 2026Oxygen, dissolved [DO], instantaneous minimum2.89 mg/L≥ 5 mg/L42%

Limits in force (39)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/LJan, Feb, Mar, Apr, Nov, Dec
Oxygen, dissolved [DO]instantaneous minimum≥ 0 mg/LMay–Oct
pHminimum≥ 0 SUMay–Oct
pHminimum≥ 6 SUJan, Feb, Mar, Apr, Nov, Dec
pHmaximum≤ 0 SUMay–Oct
pHmaximum≤ 9 SUJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedmonthly average≤ 0 mg/LMay–Oct
Solids, total suspendedmonthly average≤ 90 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspended7-day average≤ 0 mg/LMay–Oct
Solids, total suspended7-day average≤ 135 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedmonthly average≤ 0 lb/dMay–Oct
Solids, total suspendedmonthly average≤ 112.6 lb/dJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 0 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 6.98 mg/LApr
Nitrogen, ammonia total [as N]monthly average≤ 12 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]7-day average≤ 0 mg/LMay–Oct
Nitrogen, ammonia total [as N]7-day average≤ 6.98 mg/LApr
Nitrogen, ammonia total [as N]7-day average≤ 18 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 0 lb/dMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 8.7 lb/dApr
Nitrogen, ammonia total [as N]monthly average≤ 15 lb/dJan, Feb, Mar, Nov, Dec
Flow, in conduit or thru treatment plantmonthly average≤ 0 MGDMay–Oct
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)Jan, Feb, Mar, Apr, Nov, Dec
Flow, in conduit or thru treatment plantdaily maximum≤ 0 MGDMay–Oct
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)Jan, Feb, Mar, Apr, Nov, Dec
Chlorine, total residualinstantaneous maximumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec
Chlorine, total residualinstantaneous maximum≤ 0 mg/LMay–Oct
Coliform, fecal general30-day geometric mean≤ 1000 #/100mLJan, Feb, Mar, Apr, Nov, Dec
Coliform, fecal general30-day geometric mean≤ 0 #/100mLMay–Oct
Coliform, fecal general7-day geometric mean≤ 1000 #/100mLJan, Feb, Mar, Apr, Nov, Dec
Coliform, fecal general7-day geometric mean≤ 0 #/100mLMay–Oct
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≤ 25 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 0 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]7-day average≤ 37.5 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]7-day average≤ 0 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 31.3 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 0 lb/dMay–Oct

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/AR0021687 · MCP: https://passage-data.com/mcp