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Arkansas Department of Correction - North Central Unit

Correctional Institutions, Calico Rock, Arkansas. NPDES permit AR0044016 expired May 31, 2026; its limits still apply. Last 12 months: over a limit 12 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 (25 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
19 values over a limit, 25 required values missing, 3 of 12 reports late

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

Period endingParameterReportedLimitOver by
October 2025Oil & Grease, daily maximum< 12.52 lb/d≤ 11.3 lb/d11%
October 2025Oil & Grease, monthly average< 12.52 lb/d≤ 7.5 lb/d67%
November 2025BOD, carbonaceous [5 day, 20 C], daily maximum15.6 mg/L≤ 15 mg/L4%
November 2025BOD, carbonaceous [5 day, 20 C], monthly average15.6 mg/L≤ 10 mg/L56%
November 2025BOD, carbonaceous [5 day, 20 C], monthly average8.3 lb/d≤ 7.5 lb/d11%
November 2025Nitrite + Nitrate total [as N], maximum11.8 mg/L≤ 10 mg/L18%
February 2026Nitrite + Nitrate total [as N], maximum12.2 mg/L≤ 10 mg/L22%
March 2026Nitrite + Nitrate total [as N], maximum10.2 mg/L≤ 10 mg/L2%
April 2026Nitrite + Nitrate total [as N], maximum17 mg/L≤ 10 mg/L70%
April 2026Nitrite + Nitrate total [as N], maximum9.05 lb/d≤ 7.5 lb/d21%
May 2026BOD, carbonaceous [5 day, 20 C], monthly average12 mg/L≤ 10 mg/L20%
August 2026Nitrite + Nitrate total [as N], maximum11.1 mg/L≤ 10 mg/L11%

Limits in force (34)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/LJan, Feb, Mar, Apr, Nov, Dec
Oxygen, dissolved [DO]instantaneous minimum≥ 5.1 mg/LMay–Oct
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 15 mg/Lall year
Solids, total suspendeddaily maximum≤ 22.5 mg/Lall year
Solids, total suspendedmonthly average≤ 11.3 lb/dall year
Solids, total suspendeddaily maximum≤ 16.9 lb/dall year
Oil & Greasemonthly average≤ 10 mg/Lall year
Oil & Greasedaily maximum≤ 15 mg/Lall year
Oil & Greasemonthly average≤ 7.5 lb/dall year
Oil & Greasedaily maximum≤ 11.3 lb/dall year
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]monthly average≤ 3 mg/LMay–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 7.5 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 3.8 lb/dJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 2.9 lb/dApr
Nitrogen, ammonia total [as N]monthly average≤ 2.3 lb/dMay–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 5.6 lb/dJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 2.9 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 2.9 lb/dMay–Oct
Nitrite + Nitrate total [as N]maximum≤ 10 mg/Lall year
Nitrite + Nitrate total [as N]maximum≤ 7.5 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
Coliform, fecal general30-day geometric mean≤ 200 #/100mLall year
Coliform, fecal general7-day geometric mean≤ 200 #/100mLall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 15 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 7.5 lb/dall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 11.3 lb/dall year

How strict are these limits?

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

Same industry: the 5 Justice, Public Order and Safety permits in Arkansas.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/AR0044016 · MCP: https://passage-data.com/mcp