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USDA - Harry K. Dupree Stuttgart National Aquaculture Research Center

Federal facility (Noncommercial Research Organizations), Stuttgart, Arkansas. NPDES permit AR0049352, in force until Mar 31, 2028. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form A monthly (13 values), outfall 002 form A monthly (2 values), outfall 002 form Q quarterly (22 values), outfall 001 form S twice a year
Renewal application due
Oct 3, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 15 reports late

Limits in force (62)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 3 mg/LMay–Oct001
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/LJan, Feb, Mar, Apr, Nov, Dec001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 15 mg/Lall year001
Solids, total suspendeddaily maximum≤ 22.5 mg/Lall year001
Solids, total suspendedmonthly average≤ 10.8 lb/dall year001
Solids, total suspendeddaily maximum≤ 16.1 lb/dall year001
Oil & Greasemonthly average≤ 10 mg/Lall year001
Oil & Greasedaily maximum≤ 15 mg/Lall year001
Oil & Greasemonthly average≤ 7.2 lb/dall year001
Oil & Greasedaily maximum≤ 10.8 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 5.2 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 7 mg/LJan, Feb, Mar, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 5.2 mg/LMay–Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 5.2 mg/LApr001
Nitrogen, ammonia total [as N]daily maximum≤ 10.5 mg/LJan, Feb, Mar, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 7.8 mg/LMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 3.7 lb/dApr001
Nitrogen, ammonia total [as N]monthly average≤ 5 lb/dJan, Feb, Mar, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 3.7 lb/dMay–Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 3.7 lb/dApr001
Nitrogen, ammonia total [as N]daily maximum≤ 7.5 lb/dJan, Feb, Mar, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 5.6 lb/dMay–Oct001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualinstantaneous maximumreport only (mg/L)all year001
E. coli30-day geometric mean≤ 630 #/100mLall year001
E. coli7-day geometric mean≤ 2050 #/100mLall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 15 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 7.2 lb/dall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 10.8 lb/dall year001
Oxygen, dissolved [DO]instantaneous minimum≥ 3 mg/LMay–Oct002
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/LJan, Feb, Mar, Apr, Nov, Dec002
pHminimum≥ 6 SUall year002
pHmaximum≤ 9 SUall year002
Solids, total suspendedmonthly average≤ 15 mg/Lall year002
Solids, total suspendeddaily maximum≤ 22.5 mg/Lall year002
Solids, total suspendedmonthly average≤ .13 lb/dall year002
Solids, total suspendeddaily maximum≤ .19 lb/dall year002
Oil & Greasemonthly average≤ 10 mg/Lall year002
Oil & Greasedaily maximum≤ 15 mg/Lall year002
Oil & Greasemonthly average≤ .083 lb/dall year002
Oil & Greasedaily maximum≤ .13 lb/dall year002
Nitrogen, ammonia total [as N]monthly average≤ 5.2 mg/LMay–Oct002
Nitrogen, ammonia total [as N]monthly average≤ 7 mg/LJan, Feb, Mar, Apr, Nov, Dec002
Nitrogen, ammonia total [as N]daily maximum≤ 7.8 mg/LMay–Oct002
Nitrogen, ammonia total [as N]daily maximum≤ 10.5 mg/LJan, Feb, Mar, Apr, Nov, Dec002
Nitrogen, ammonia total [as N]monthly average≤ .43 lb/dMay–Oct002
Nitrogen, ammonia total [as N]monthly average≤ .058 lb/dJan, Feb, Mar, Apr, Nov, Dec002
Nitrogen, ammonia total [as N]daily maximum≤ .065 lb/dMay–Oct002
Nitrogen, ammonia total [as N]daily maximum≤ .088 lb/dJan, Feb, Mar, Apr, Nov, Dec002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Chlorine, total residualinstantaneous maximumreport only (mg/L)all year002
E. coli30-day geometric mean≤ 630 #/100mLall year002
E. coli7-day geometric mean≤ 2050 #/100mLall year002
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year002
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 15 mg/Lall year002
BOD, carbonaceous [5 day, 20 C]monthly average≤ .083 lb/dall year002
BOD, carbonaceous [5 day, 20 C]daily maximum≤ .13 lb/dall year002

How strict are these limits?

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

Same industry: the 3 Engineering, Accounting, Research and Management Services permits in Arkansas.

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On EPA ECHO: Facility report · DMR history

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