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PCSSD - Oak Grove High School Treatment Facility

Elementary And Secondary Schools, North Little Rock, Arkansas. NPDES permit AR0044750 expired Jun 30, 2026; its limits still apply. Last 12 months: over a limit 18 times (last July 2026), 1 required value missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: form A monthly (4 values), form Q quarterly (11 values), form F quarterly
Last report on file
August 2026
Oct 2024 – Sep 2025
14 values over a limit, 0 required values missing, 2 of 20 reports late

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

All 18 values over a limit
Period endingParameterReportedLimitOver by
October 2025Nitrogen, ammonia total [as N], daily maximum22.5 mg/L≤ 6 mg/L275%
October 2025Nitrogen, ammonia total [as N], daily maximum4.91 lb/d≤ 1.5 lb/d227%
October 2025Nitrogen, ammonia total [as N], monthly average1.75 lb/d≤ 1 lb/d75%
October 2025Nitrogen, ammonia total [as N], monthly average20.56 mg/L≤ 4 mg/L414%
October 2025Oxygen, dissolved [DO], instantaneous minimum3.82 mg/L≥ 4 mg/L5%
December 2025Coliform, fecal general, 30-day geometric mean> 2419 #/100mL≤ 1000 #/100mL—
December 2025Coliform, fecal general, 7-day geometric mean> 2419 #/100mL≤ 2000 #/100mL—
March 2026Coliform, fecal general, 30-day geometric mean> 2419 #/100mL≤ 1000 #/100mL—
March 2026Coliform, fecal general, 7-day geometric mean> 2419 #/100mL≤ 2000 #/100mL—
March 2026Solids, total suspended, daily maximum40 mg/L≤ 30 mg/L33%
March 2026Solids, total suspended, daily maximum8.3 lb/d≤ 7.5 lb/d11%
March 2026Solids, total suspended, monthly average25.35 mg/L≤ 20 mg/L27%
June 2026Coliform, fecal general, 30-day geometric mean> 2419 #/100mL≤ 1000 #/100mL—
June 2026Coliform, fecal general, 7-day geometric mean> 2419 #/100mL≤ 2000 #/100mL—
July 2026Nitrogen, ammonia total [as N], daily maximum12.2 lb/d≤ 1.5 lb/d713%
July 2026Nitrogen, ammonia total [as N], daily maximum61 mg/L≤ 6 mg/L917%
July 2026Nitrogen, ammonia total [as N], monthly average2.7 lb/d≤ 1 lb/d170%
July 2026Nitrogen, ammonia total [as N], monthly average33 mg/L≤ 4 mg/L725%

Limits in force (29)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 2 mg/LJan, Feb, Mar, Apr, Nov, Dec
Oxygen, dissolved [DO]instantaneous minimum≥ 4 mg/LMay–Oct
BOD, 5-day, 20 deg. Cmonthly average≤ 20 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cdaily maximum≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 5 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cdaily maximum≤ 7.5 lb/dJan, Feb, Mar, Apr, Nov, Dec
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 20 mg/Lall year
Solids, total suspendeddaily maximum≤ 30 mg/Lall year
Solids, total suspendedmonthly average≤ 5 lb/dall year
Solids, total suspendeddaily maximum≤ 7.5 lb/dall year
Oil & Greasemonthly average≤ 10 mg/Lall year
Oil & Greasedaily maximum≤ 15 mg/Lall year
Oil & Greasemonthly average≤ 2.5 lb/dall year
Oil & Greasedaily maximum≤ 3.8 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 4 mg/LMay–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 6 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 1 lb/dMay–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 1.5 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
BOD, carbonaceous [5 day, 20 C]monthly average≤ 20 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 30 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 5 lb/dMay–Oct
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 7.5 lb/dMay–Oct

How strict are these limits?

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

Same industry: the 25 Educational Services 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/AR0044750 · MCP: https://passage-data.com/mcp