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Oak Hill Utility Operating Company, LLC-Oak Tree Subdivision WWTP

Subdividers And Developers, Vilonia, Arkansas. NPDES permit AR0050792, in force until Mar 31, 2029. Last 12 months: over a limit 18 times (last July 2026), 11 of 17 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: form A monthly (6 values), form Q quarterly (22 values), form F quarterly
Last report on file
August 2026
Oct 2024 – Sep 2025
14 values over a limit, 44 required values missing, 6 of 19 reports late

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

All 18 values over a limit
Period endingParameterReportedLimitOver by
March 2026BOD, carbonaceous [5 day, 20 C], daily maximum24.6 mg/L≤ 23 mg/L7%
March 2026BOD, carbonaceous [5 day, 20 C], monthly average24.6 mg/L≤ 15 mg/L64%
March 2026Coliform, fecal general, 30-day geometric mean> 2000 #/100mL≤ 1000 #/100mL—
March 2026Coliform, fecal general, 7-day geometric mean> 2000 #/100mL≤ 2000 #/100mL—
March 2026Nitrogen, ammonia total [as N], daily maximum27.4 mg/L≤ 15 mg/L83%
April 2026Nitrogen, ammonia total [as N], daily maximum1.89 lb/d≤ 1.4 lb/d35%
April 2026Nitrogen, ammonia total [as N], daily maximum27.3 mg/L≤ 5.6 mg/L388%
April 2026Nitrogen, ammonia total [as N], monthly average1.89 lb/d≤ 1.4 lb/d35%
April 2026Nitrogen, ammonia total [as N], monthly average27.3 mg/L≤ 5.6 mg/L388%
June 2026BOD, carbonaceous [5 day, 20 C], daily maximum23.2 mg/L≤ 23 mg/L1%
June 2026BOD, carbonaceous [5 day, 20 C], monthly average23.2 mg/L≤ 15 mg/L55%
June 2026Coliform, fecal general, 30-day geometric mean> 2000 #/100mL≤ 1000 #/100mL—
June 2026Coliform, fecal general, 7-day geometric mean> 2000 #/100mL≤ 2000 #/100mL—
June 2026Solids, total suspended, monthly average28 mg/L≤ 20 mg/L40%
July 2026Nitrogen, ammonia total [as N], daily maximum2.33 lb/d≤ 1.9 lb/d23%
July 2026Nitrogen, ammonia total [as N], daily maximum42.2 mg/L≤ 7.5 mg/L463%
July 2026Nitrogen, ammonia total [as N], monthly average2.08 lb/d≤ 1.3 lb/d60%
July 2026Nitrogen, ammonia total [as N], monthly average36.8 mg/L≤ 5 mg/L636%

Limits in force (40)

ParameterStatisticLimitMonths
Flow ratemonthly averagereport only (%)all year
Flow ratedaily maximumreport only (%)all year
Oxygen, dissolved [DO]instantaneous minimum≥ 4 mg/Lall year
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
Nitrogen, ammonia total [as N]monthly average≤ 5.6 mg/LApr
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 10 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 5.6 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 7.5 mg/LMay–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 15 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 1.4 lb/dApr
Nitrogen, ammonia total [as N]monthly average≤ 1.3 lb/dMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 2.5 lb/dJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 1.4 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 1.9 lb/dMay–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 3.8 lb/dJan, Feb, Mar, Nov, Dec
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year
Nitrite + Nitrate total [as N]monthly averagereport only (lb/d)all year
Nitrite + Nitrate total [as N]daily maximumreport only (lb/d)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Phosphorus, total [as P]daily maximumreport 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
Chlorine, total residualinstantaneous maximum≤ .011 mg/Lall 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≤ 15 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 23 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 3.8 lb/dall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 5.6 lb/dall year

How strict are these limits?

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

Same industry: the 50 Real Estate permits in Arkansas.

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