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Dierks, City of - Dierks Wastewater Treatment Facility

Sewage treatment plant, Dierks, Arkansas. NPDES permit AR0021709, in force until Feb 28, 2029. Last 12 months: over a limit 16 times (last August 2026), 1 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
9 values over a limit, 0 required values missing, 1 of 12 reports late

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

All 16 values over a limit
Period endingParameterReportedLimitOver by
November 2025Solids, total suspended, 7-day average33.5 mg/L≤ 30 mg/L12%
November 2025Solids, total suspended, monthly average31.25 mg/L≤ 20 mg/L56%
November 2025Solids, total suspended, monthly average57.92 lb/d≤ 38.4 lb/d51%
January 2026Solids, total suspended, 7-day average38.5 mg/L≤ 30 mg/L28%
January 2026Solids, total suspended, monthly average23.5 mg/L≤ 20 mg/L18%
January 2026Solids, total suspended, monthly average68.4 lb/d≤ 38.4 lb/d78%
February 2026BOD, carbonaceous [5 day, 20 C], monthly average47.8 lb/d≤ 38.4 lb/d24%
February 2026Nitrogen, ammonia total [as N], monthly average16.9 lb/d≤ 15.3 lb/d10%
February 2026Solids, total suspended, monthly average57.83 lb/d≤ 38.4 lb/d51%
April 2026Solids, total suspended, 7-day average33 mg/L≤ 30 mg/L10%
April 2026Solids, total suspended, monthly average65.54 lb/d≤ 38.4 lb/d71%
May 2026Solids, total suspended, 7-day average24 mg/L≤ 22.5 mg/L7%
May 2026Solids, total suspended, monthly average22 mg/L≤ 15 mg/L47%
May 2026Solids, total suspended, monthly average50.09 lb/d≤ 28.8 lb/d74%
August 2026Nitrogen, ammonia total [as N], 7-day average6.32 mg/L≤ 6.1 mg/L4%
August 2026Nitrogen, ammonia total [as N], monthly average5.14 mg/L≤ 5 mg/L3%

Limits in force (33)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/Lall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 15 mg/LMay–Oct
Solids, total suspendedmonthly average≤ 20 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspended7-day average≤ 22.5 mg/LMay–Oct
Solids, total suspended7-day average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedmonthly average≤ 28.8 lb/dMay–Oct
Solids, total suspendedmonthly average≤ 38.4 lb/dJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 8 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 6.1 mg/LApr
Nitrogen, ammonia total [as N]7-day average≤ 6.1 mg/LMay–Oct
Nitrogen, ammonia total [as N]7-day average≤ 12 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]7-day average≤ 6.1 mg/LApr
Nitrogen, ammonia total [as N]monthly average≤ 9.6 lb/dMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 15.3 lb/dJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 11.7 lb/dApr
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, colony forming units30-day geometric mean≤ 1000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
Coliform, fecal, colony forming units30-day geometric mean≤ 200 #/100mLMay–Sep
Coliform, fecal, colony forming units7-day geometric mean≤ 2000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
Coliform, fecal, colony forming units7-day geometric mean≤ 400 #/100mLMay–Sep
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/LJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]7-day average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]7-day average≤ 15 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 38.4 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 19.2 lb/dMay–Oct

New limits from Mar 1, 2027

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Chlorine, total residual, instantaneous maximum0.011 mg/Lnew0.105 mg/L (10 values)9.55×

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/AR0021709 · MCP: https://passage-data.com/mcp