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Clarendon, City of - Clarendon WWTP

Sewage treatment plant, Clarendon, Arkansas. NPDES permit AR0021644, in force until Jun 30, 2031. Last 12 months: over a limit once (last June 2026), 66 required values missing, 9 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: form A monthly (15 values), form Y yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
2 values over a limit, 165 required values missing, 12 of 12 reports late

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

Period endingParameterReportedLimitOver by
June 2026Oxygen, dissolved [DO], instantaneous minimum1.73 mg/L≥ 2 mg/L14%

Limits in force (23)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 2 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. C7-day average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 175 lb/dall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 175 lb/dall year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]7-day averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]7-day averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (lb/d)all 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 #/100mLApr–Oct
E. coli30-day geometric mean≤ 630 #/100mLJan, Feb, Mar, Nov, Dec
E. coli7-day geometric mean≤ 410 #/100mLApr–Oct
E. coli7-day geometric mean≤ 2050 #/100mLJan, Feb, Mar, Nov, Dec
Overflowsmonthly totalreport only (occur/mo)all year
Overflow volume [SS0 volume, CSO volume]monthly totalreport only (gal)all year

How strict are these limits?

Cited limits by parameter: Arkansas's rules and the federal ones.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/AR0021644 · MCP: https://passage-data.com/mcp