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Charleston, City of

Sewage treatment plant, Charleston, Arkansas. NPDES permit AR0033791 expired Sep 30, 2024; its limits still apply. Last 12 months: over a limit 17 times (last August 2026), 2 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
10 values over a limit, 2 required values missing, 9 of 12 reports late

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

All 17 values over a limit
Period endingParameterReportedLimitOver by
January 2026Nitrogen, ammonia total [as N], monthly average10.01 mg/L≤ 9.6 mg/L4%
April 2026Solids, total suspended, monthly average20.5 mg/L≤ 20 mg/L3%
April 2026pH, maximum9.72 SU≤ 9 SU—
May 2026Solids, total suspended, 7-day average47 mg/L≤ 45 mg/L4%
May 2026Solids, total suspended, monthly average188.03 lb/d≤ 125.1 lb/d50%
May 2026Solids, total suspended, monthly average43 mg/L≤ 30 mg/L43%
June 2026Solids, total suspended, 7-day average55 mg/L≤ 45 mg/L22%
June 2026Solids, total suspended, monthly average241.45 lb/d≤ 125.1 lb/d93%
June 2026Solids, total suspended, monthly average50 mg/L≤ 30 mg/L67%
June 2026pH, maximum9.67 SU≤ 9 SU—
July 2026Solids, total suspended, 7-day average90 mg/L≤ 45 mg/L100%
July 2026Solids, total suspended, monthly average219.26 lb/d≤ 125.1 lb/d75%
July 2026Solids, total suspended, monthly average83.5 mg/L≤ 30 mg/L178%
July 2026pH, maximum9.03 SU≤ 9 SU—
August 2026Solids, total suspended, 7-day average92 mg/L≤ 45 mg/L104%
August 2026Solids, total suspended, monthly average79 mg/L≤ 30 mg/L163%
August 2026pH, maximum9.45 SU≤ 9 SU—

Limits in force (31)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/Lall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/LMay–Oct
Solids, total suspendedmonthly average≤ 20 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspended7-day average≤ 45 mg/LMay–Oct
Solids, total suspended7-day average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedmonthly average≤ 125.1 lb/dMay–Oct
Solids, total suspendedmonthly average≤ 83.4 lb/dJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 5.6 mg/LApr
Nitrogen, ammonia total [as N]monthly average≤ 9.6 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/LMay–Oct
Nitrogen, ammonia total [as N]7-day average≤ 5.6 mg/LApr
Nitrogen, ammonia total [as N]7-day average≤ 14.4 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]7-day average≤ 7.5 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 23.4 lb/dApr
Nitrogen, ammonia total [as N]monthly average≤ 40 lb/dJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 20.9 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
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/LMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 15 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]7-day average≤ 30 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]7-day average≤ 22.5 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 83.4 lb/dMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 62.6 lb/dJan, Feb, Mar, Apr, Nov, Dec

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/AR0033791 · MCP: https://passage-data.com/mcp