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Oak Hill Utility Operating Company, LLC-North Hills Subdivision

Subdividers And Developers, Conway, Arkansas. NPDES permit AR0050491, in force until Mar 31, 2029. Last 12 months: over a limit 101 times (last August 2026), 18 required values missing, 18 of 25 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: form A monthly (24 values), form A1 monthly (24 values), form Q quarterly (4 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
167 values over a limit, 148 required values missing, 10 of 28 reports late

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

All 101 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, carbonaceous [5 day, 20 C], daily maximum24.6 mg/L≤ 15 mg/L64%
October 2025BOD, carbonaceous [5 day, 20 C], daily maximum8.44 lb/d≤ 5 lb/d69%
October 2025BOD, carbonaceous [5 day, 20 C], monthly average24.6 mg/L≤ 10 mg/L146%
October 2025BOD, carbonaceous [5 day, 20 C], monthly average8.44 lb/d≤ 3.3 lb/d156%
October 2025Coliform, fecal general, 30-day geometric mean> 2000 #/100mL≤ 1000 #/100mL—
October 2025Coliform, fecal general, 7-day geometric mean> 2000 #/100mL≤ 2000 #/100mL—
October 2025Nitrogen, ammonia total [as N], daily maximum22.2 mg/L≤ 4.5 mg/L393%
October 2025Nitrogen, ammonia total [as N], daily maximum7.62 lb/d≤ 1.5 lb/d408%
October 2025Nitrogen, ammonia total [as N], monthly average22.2 mg/L≤ 3 mg/L640%
October 2025Nitrogen, ammonia total [as N], monthly average7.62 lb/d≤ 1 lb/d662%
October 2025Oxygen, dissolved [DO], instantaneous minimum2.7 mg/L≥ 6 mg/L55%
November 2025BOD, carbonaceous [5 day, 20 C], monthly average12.6 mg/L≤ 10 mg/L26%
November 2025BOD, carbonaceous [5 day, 20 C], monthly average3.79 lb/d≤ 3.3 lb/d15%
November 2025Coliform, fecal general, 30-day geometric mean3150 #/100mL≤ 1000 #/100mL215%
November 2025Coliform, fecal general, 7-day geometric mean3150 #/100mL≤ 2000 #/100mL58%
November 2025Nitrogen, ammonia total [as N], daily maximum13.8 mg/L≤ 9 mg/L53%
November 2025Nitrogen, ammonia total [as N], daily maximum4.15 lb/d≤ 3 lb/d38%
November 2025Nitrogen, ammonia total [as N], monthly average13.8 mg/L≤ 6 mg/L130%
November 2025Nitrogen, ammonia total [as N], monthly average4.15 lb/d≤ 2 lb/d108%
December 2025BOD, carbonaceous [5 day, 20 C], daily maximum16.9 mg/L≤ 15 mg/L13%
December 2025BOD, carbonaceous [5 day, 20 C], monthly average16.9 mg/L≤ 10 mg/L69%
December 2025BOD, carbonaceous [5 day, 20 C], monthly average4.98 lb/d≤ 3.3 lb/d51%
December 2025Coliform, fecal general, 30-day geometric mean> 2000 #/100mL≤ 1000 #/100mL—
December 2025Coliform, fecal general, 7-day geometric mean> 2000 #/100mL≤ 2000 #/100mL—
December 2025Nitrogen, ammonia total [as N], daily maximum10.8 mg/L≤ 9 mg/L20%
December 2025Nitrogen, ammonia total [as N], daily maximum3.18 lb/d≤ 3 lb/d6%
December 2025Nitrogen, ammonia total [as N], monthly average10.8 mg/L≤ 6 mg/L80%
December 2025Nitrogen, ammonia total [as N], monthly average3.18 lb/d≤ 2 lb/d59%
January 2026BOD, carbonaceous [5 day, 20 C], daily maximum22.2 mg/L≤ 15 mg/L48%
January 2026BOD, carbonaceous [5 day, 20 C], daily maximum6.19 lb/d≤ 5 lb/d24%
January 2026BOD, carbonaceous [5 day, 20 C], monthly average22.2 mg/L≤ 10 mg/L122%
January 2026BOD, carbonaceous [5 day, 20 C], monthly average6.19 lb/d≤ 3.3 lb/d88%
January 2026Coliform, fecal general, 30-day geometric mean> 2000 #/100mL≤ 1000 #/100mL—
January 2026Coliform, fecal general, 7-day geometric mean> 2000 #/100mL≤ 2000 #/100mL—
January 2026Nitrogen, ammonia total [as N], daily maximum13.1 mg/L≤ 9 mg/L46%
January 2026Nitrogen, ammonia total [as N], daily maximum3.65 lb/d≤ 3 lb/d22%
January 2026Nitrogen, ammonia total [as N], monthly average13.1 mg/L≤ 6 mg/L118%
January 2026Nitrogen, ammonia total [as N], monthly average3.65 lb/d≤ 2 lb/d83%
February 2026BOD, carbonaceous [5 day, 20 C], daily maximum28.43 lb/d≤ 5 lb/d469%
February 2026BOD, carbonaceous [5 day, 20 C], daily maximum55.1 mg/L≤ 15 mg/L267%
February 2026BOD, carbonaceous [5 day, 20 C], monthly average28.43 lb/d≤ 3.3 lb/d762%
February 2026BOD, carbonaceous [5 day, 20 C], monthly average55.1 mg/L≤ 10 mg/L451%
February 2026Coliform, fecal general, 30-day geometric mean> 2000 #/100mL≤ 1000 #/100mL—
February 2026Coliform, fecal general, 7-day geometric mean> 2000 #/100mL≤ 2000 #/100mL—
February 2026Nitrogen, ammonia total [as N], daily maximum10.58 lb/d≤ 3 lb/d253%
February 2026Nitrogen, ammonia total [as N], daily maximum20.5 mg/L≤ 9 mg/L128%
February 2026Nitrogen, ammonia total [as N], monthly average10.58 lb/d≤ 2 lb/d429%
February 2026Nitrogen, ammonia total [as N], monthly average20.5 mg/L≤ 6 mg/L242%
February 2026Solids, total suspended, monthly average7.22 lb/d≤ 5 lb/d44%
April 2026BOD, carbonaceous [5 day, 20 C], daily maximum31.2 mg/L≤ 15 mg/L108%
April 2026BOD, carbonaceous [5 day, 20 C], daily maximum9.49 lb/d≤ 5 lb/d90%
April 2026BOD, carbonaceous [5 day, 20 C], monthly average31.2 mg/L≤ 10 mg/L212%
April 2026BOD, carbonaceous [5 day, 20 C], monthly average9.49 lb/d≤ 3.3 lb/d188%
April 2026Coliform, fecal general, 30-day geometric mean> 2000 #/100mL≤ 1000 #/100mL—
April 2026Coliform, fecal general, 7-day geometric mean> 2000 #/100mL≤ 2000 #/100mL—
April 2026Nitrogen, ammonia total [as N], daily maximum15.4 mg/L≤ 5.6 mg/L175%
April 2026Nitrogen, ammonia total [as N], daily maximum4.69 lb/d≤ 1.9 lb/d147%
April 2026Nitrogen, ammonia total [as N], monthly average15.4 mg/L≤ 5.6 mg/L175%
April 2026Nitrogen, ammonia total [as N], monthly average4.69 lb/d≤ 1.9 lb/d147%
May 2026BOD, carbonaceous [5 day, 20 C], daily maximum10.26 lb/d≤ 5 lb/d105%
May 2026BOD, carbonaceous [5 day, 20 C], daily maximum34.3 mg/L≤ 15 mg/L129%
May 2026BOD, carbonaceous [5 day, 20 C], monthly average10.26 lb/d≤ 3.3 lb/d211%
May 2026BOD, carbonaceous [5 day, 20 C], monthly average34.3 mg/L≤ 10 mg/L243%
May 2026Coliform, fecal general, 30-day geometric mean> 2000 #/100mL≤ 200 #/100mL—
May 2026Coliform, fecal general, 7-day geometric mean> 2000 #/100mL≤ 400 #/100mL—
May 2026Nitrogen, ammonia total [as N], daily maximum2.81 lb/d≤ 1.5 lb/d87%
May 2026Nitrogen, ammonia total [as N], daily maximum9.4 mg/L≤ 4.5 mg/L109%
May 2026Nitrogen, ammonia total [as N], monthly average2.81 lb/d≤ 1 lb/d181%
May 2026Nitrogen, ammonia total [as N], monthly average9.4 mg/L≤ 3 mg/L213%
May 2026Oxygen, dissolved [DO], instantaneous minimum2.63 mg/L≥ 6 mg/L56%
June 2026BOD, carbonaceous [5 day, 20 C], daily maximum12.34 lb/d≤ 5 lb/d147%
June 2026BOD, carbonaceous [5 day, 20 C], daily maximum28.4 mg/L≤ 15 mg/L89%
June 2026BOD, carbonaceous [5 day, 20 C], monthly average12.34 lb/d≤ 3.3 lb/d274%
June 2026BOD, carbonaceous [5 day, 20 C], monthly average28.4 mg/L≤ 10 mg/L184%
June 2026Coliform, fecal general, 30-day geometric mean> 2000 #/100mL≤ 200 #/100mL—
June 2026Coliform, fecal general, 7-day geometric mean> 2000 #/100mL≤ 400 #/100mL—
June 2026Nitrogen, ammonia total [as N], daily maximum14.5 mg/L≤ 4.5 mg/L222%
June 2026Nitrogen, ammonia total [as N], daily maximum6.3 lb/d≤ 1.5 lb/d320%
June 2026Nitrogen, ammonia total [as N], monthly average14.5 mg/L≤ 3 mg/L383%
June 2026Nitrogen, ammonia total [as N], monthly average6.3 lb/d≤ 1 lb/d530%
June 2026Oxygen, dissolved [DO], instantaneous minimum3.79 mg/L≥ 6 mg/L37%
July 2026BOD, carbonaceous [5 day, 20 C], daily maximum10.35 lb/d≤ 5 lb/d107%
July 2026BOD, carbonaceous [5 day, 20 C], daily maximum33.6 mg/L≤ 15 mg/L124%
July 2026BOD, carbonaceous [5 day, 20 C], monthly average10.35 lb/d≤ 3.3 lb/d214%
July 2026BOD, carbonaceous [5 day, 20 C], monthly average33.6 mg/L≤ 10 mg/L236%
July 2026Coliform, fecal general, 30-day geometric mean> 2000 #/100mL≤ 200 #/100mL—
July 2026Coliform, fecal general, 7-day geometric mean> 2000 #/100mL≤ 400 #/100mL—
July 2026Nitrogen, ammonia total [as N], daily maximum11.2 mg/L≤ 4.5 mg/L149%
July 2026Nitrogen, ammonia total [as N], daily maximum3.45 lb/d≤ 1.5 lb/d130%
July 2026Nitrogen, ammonia total [as N], monthly average11.2 mg/L≤ 3 mg/L273%
July 2026Nitrogen, ammonia total [as N], monthly average3.45 lb/d≤ 1 lb/d245%
July 2026Oxygen, dissolved [DO], instantaneous minimum2.41 mg/L≥ 6 mg/L60%
August 2026BOD, carbonaceous [5 day, 20 C], monthly average14.6 mg/L≤ 10 mg/L46%
August 2026BOD, carbonaceous [5 day, 20 C], monthly average4.27 lb/d≤ 3.3 lb/d29%
August 2026Coliform, fecal general, 30-day geometric mean> 2000 #/100mL≤ 200 #/100mL—
August 2026Coliform, fecal general, 7-day geometric mean> 2000 #/100mL≤ 400 #/100mL—
August 2026Nitrogen, ammonia total [as N], daily maximum2.87 lb/d≤ 1.5 lb/d91%
August 2026Nitrogen, ammonia total [as N], daily maximum9.8 mg/L≤ 4.5 mg/L118%
August 2026Nitrogen, ammonia total [as N], monthly average2.87 lb/d≤ 1 lb/d187%
August 2026Nitrogen, ammonia total [as N], monthly average9.8 mg/L≤ 3 mg/L227%
August 2026Oxygen, dissolved [DO], instantaneous minimum5.54 mg/L≥ 6 mg/L8%

Limits in force (74)

ParameterStatisticLimitMonths
Flow ratemonthly averagereport only (%)all year
Flow ratemonthly averagereport only (%)all year
Flow ratedaily maximumreport only (%)all year
Flow ratedaily maximumreport only (%)all year
Oxygen, dissolved [DO]instantaneous minimum≥ 2 mg/LJan, Feb, Mar, Apr, Nov, Dec
Oxygen, dissolved [DO]instantaneous minimum≥ 6 mg/LMay–Oct
Oxygen, dissolved [DO]instantaneous minimum≥ 2 mg/LJan, Feb, Mar, Apr, Nov, Dec
Oxygen, dissolved [DO]instantaneous minimum≥ 6 mg/LMay–Oct
pHminimum≥ 6 SUall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 15 mg/Lall year
Solids, total suspendedmonthly average≤ 15 mg/Lall year
Solids, total suspendeddaily maximum≤ 22.5 mg/Lall year
Solids, total suspendeddaily maximum≤ 22.5 mg/Lall year
Solids, total suspendedmonthly average≤ 5 lb/dall year
Solids, total suspendedmonthly average≤ 8.1 lb/dall year
Solids, total suspendeddaily maximum≤ 7.5 lb/dall year
Solids, total suspendeddaily maximum≤ 12.2 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 3 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 6 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 5.6 mg/LApr
Nitrogen, ammonia total [as N]monthly average≤ 3 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 6 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 5.6 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 4.5 mg/LMay–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 9 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 5.6 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 4.5 mg/LMay–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 9 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 5.6 mg/LApr
Nitrogen, ammonia total [as N]monthly average≤ 1 lb/dMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 2 lb/dJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 1.9 lb/dApr
Nitrogen, ammonia total [as N]monthly average≤ 1.6 lb/dMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 3.3 lb/dJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 3 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 1.5 lb/dMay–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 3 lb/dJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 1.9 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 2.4 lb/dMay–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 4.9 lb/dJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 3 lb/dApr
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 plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport 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
Chlorine, total residualinstantaneous maximum≤ .011 mg/Lall year
Coliform, fecal general30-day geometric mean≤ 200 #/100mLMay–Sep
Coliform, fecal general30-day geometric mean≤ 1000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
Coliform, fecal general30-day geometric mean≤ 200 #/100mLMay–Sep
Coliform, fecal general30-day geometric mean≤ 1000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
Coliform, fecal general7-day geometric mean≤ 400 #/100mLMay–Sep
Coliform, fecal general7-day geometric mean≤ 2000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
Coliform, fecal general7-day geometric mean≤ 400 #/100mLMay–Sep
Coliform, fecal general7-day geometric mean≤ 2000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
Overflowsmonthly totalreport only (occur/mo)all year
Overflowsmonthly totalreport only (occur/mo)all year
Overflow volume [SS0 volume, CSO volume]monthly totalreport only (gal)all year
Overflow volume [SS0 volume, CSO volume]monthly totalreport only (gal)all year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall 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]daily maximum≤ 15 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 3.3 lb/dall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 5.4 lb/dall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 5 lb/dall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 8.1 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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