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Benton Utilities

Sewage treatment plant, major discharger, Benton, Arkansas. NPDES permit AR0036498 expired Mar 31, 2026; its limits still apply. Last 12 months: over a limit 4 times (last May 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form B monthly (22 values), outfall TX1 form Q quarterly (16 values), outfall 001 form Y yearly
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 17 reports late

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

Period endingParameterReportedLimitOver by
February 2026Solids, total suspended, 7-day average50.3 mg/L≤ 22.5 mg/L124%
February 2026Solids, total suspended, monthly average15.3 mg/L≤ 15 mg/L2%
May 2026Solids, total suspended, 7-day average56.5 mg/L≤ 22.5 mg/L151%
May 2026Solids, total suspended, monthly average16.7 mg/L≤ 15 mg/L11%

Limits in force (56)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 7 mg/LMay–Oct001
Oxygen, dissolved [DO]instantaneous minimum≥ 7.5 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 suspended7-day average≤ 22.5 mg/Lall year001
Solids, total suspendedmonthly average≤ 1038.3 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 2.4 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 4 mg/LJan, Feb, Mar, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LMay–Oct001
Nitrogen, ammonia total [as N]7-day average≤ 6 mg/LApr001
Nitrogen, ammonia total [as N]7-day average≤ 6 mg/LJan, Feb, Mar, Nov, Dec001
Nitrogen, ammonia total [as N]7-day average≤ 2.3 mg/LMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 166.1 lb/dApr001
Nitrogen, ammonia total [as N]monthly average≤ 276.8 lb/dJan, Feb, Mar, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 103.8 lb/dMay–Oct001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year001
Nitrite + Nitrate total [as N]7-day averagereport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]7-day averagereport only (mg/L)all year001
Hardness, total [as CaCO3]instantaneous minimum≥ 41 mg/Lall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Solids, total dissolvedmonthly averagereport only (mg/L)all year001
Solids, total dissolved7-day averagereport only (mg/L)all year001
Solids, total dissolvedmonthly average≤ 17034.64 lb/dall year001
Mercury, total recoverablemonthly averagereport only (ug/L)all year001
Mercury, total recoverable7-day averagereport only (ug/L)all year001
Coliform, fecal general30-day geometric mean≤ 200 #/100mLMay–Sep001
Coliform, fecal general30-day geometric mean≤ 1000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec001
Coliform, fecal general7-day geometric mean≤ 400 #/100mLMay–Sep001
Coliform, fecal general7-day geometric mean≤ 2000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec001
Overflowsmonthly totalreport only (occur/mo)all year001
Overflow volume [SS0 volume, CSO volume]monthly totalreport only (gal)all year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LMay–Oct001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 15 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]7-day average≤ 15 mg/LMay–Oct001
BOD, carbonaceous [5 day, 20 C]7-day average≤ 22.5 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 692.2 lb/dMay–Oct001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 1038.3 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Whole effluent toxicity - retest #17-day averagereport only (pass=0;fail=1)all yearTX1
Whole effluent toxicity - retest #27-day averagereport only (pass=0;fail=1)all yearTX1
WET, sublethal retest #17-day averagereport only (pass=0;fail=1)all yearTX1
WET, sublethal retest #27-day averagereport only (pass=0;fail=1)all yearTX1
Whole Effluent Toxicity - Retest #37-day averagereport only (pass=0;fail=1)all yearTX1
Whole Effluent Toxicity, Sub-Lethal Retest #37-day averagereport only (pass=0;fail=1)all yearTX1
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day averagereport only (pass=0;fail=1)all yearTX1
Pass/Fail Static Renewal 7Day Chronic Pimephales promelas7-day averagereport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day averagereport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7-day averagereport only (pass=0;fail=1)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day averagereport only (%)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day averagereport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day averagereport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day averagereport only (%)all yearTX1
Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia7-day averagereport only (%)all yearTX1
Coef Of Var Static Renewal 7Day Chronic Pimephales promelas7-day averagereport only (%)all yearTX1

How strict are these limits?

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

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/AR0036498 · MCP: https://passage-data.com/mcp