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Starkville Potw

Sewage treatment plant, major discharger, Starkville, Mississippi. NPDES permit MS0036145, in force until Aug 31, 2030. Last 12 months: over a limit 64 times (last July 2026), 2 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (57 values), form Q quarterly
Last report on file
August 2026
Oct 2024 – Sep 2025
35 values over a limit, 2 required values missing, 2 of 15 reports late

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

All 64 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, 5-day, 20 deg. C, monthly average17 mg/L≤ 10 mg/L70%
October 2025BOD, 5-day, 20 deg. C, maximum weekly average21 mg/L≤ 15 mg/L40%
October 2025BOD, 5-day, percent removal, minimum84 %≥ 85 %7%
October 2025Nitrogen, ammonia total [as N], monthly average30 mg/L≤ 2 mg/L1400%
October 2025Nitrogen, ammonia total [as N], monthly average909 lb/d≤ 167 lb/d444%
October 2025Nitrogen, ammonia total [as N], maximum weekly average35 mg/L≤ 3 mg/L1067%
October 2025Nitrogen, ammonia total [as N], maximum weekly average977 lb/d≤ 250 lb/d291%
October 2025Solids, suspended percent removal, minimum84 %≥ 85 %7%
November 2025BOD, 5-day, 20 deg. C, monthly average16 mg/L≤ 10 mg/L60%
November 2025BOD, 5-day, 20 deg. C, maximum weekly average19 mg/L≤ 15 mg/L27%
November 2025BOD, 5-day, percent removal, minimum83 %≥ 85 %13%
November 2025Nitrogen, ammonia total [as N], monthly average27 mg/L≤ 2 mg/L1250%
November 2025Nitrogen, ammonia total [as N], monthly average859 lb/d≤ 167 lb/d414%
November 2025Nitrogen, ammonia total [as N], maximum weekly average1031 lb/d≤ 250 lb/d312%
November 2025Nitrogen, ammonia total [as N], maximum weekly average33 mg/L≤ 3 mg/L1000%
December 2025BOD, 5-day, 20 deg. C, monthly average17 mg/L≤ 10 mg/L70%
December 2025BOD, 5-day, 20 deg. C, maximum weekly average23 mg/L≤ 15 mg/L53%
December 2025BOD, 5-day, percent removal, minimum82 %≥ 85 %20%
December 2025E. coli, monthly average191 #/100mL≤ 126 #/100mL52%
December 2025Nitrogen, ammonia total [as N], monthly average224 lb/d≤ 167 lb/d34%
December 2025Nitrogen, ammonia total [as N], monthly average5 mg/L≤ 2 mg/L150%
December 2025Nitrogen, ammonia total [as N], maximum weekly average14 mg/L≤ 3 mg/L367%
December 2025Nitrogen, ammonia total [as N], maximum weekly average500 lb/d≤ 250 lb/d100%
January 2026BOD, 5-day, 20 deg. C, monthly average12 mg/L≤ 10 mg/L20%
January 2026BOD, 5-day, 20 deg. C, maximum weekly average17 mg/L≤ 15 mg/L13%
January 2026BOD, 5-day, percent removal, minimum84 %≥ 85 %7%
January 2026Nitrogen, ammonia total [as N], monthly average348 lb/d≤ 167 lb/d108%
January 2026Nitrogen, ammonia total [as N], monthly average6 mg/L≤ 2 mg/L200%
January 2026Nitrogen, ammonia total [as N], maximum weekly average16 mg/L≤ 3 mg/L433%
January 2026Nitrogen, ammonia total [as N], maximum weekly average836 lb/d≤ 250 lb/d234%
January 2026Solids, suspended percent removal, minimum54 %≥ 85 %207%
January 2026Solids, total suspended, maximum weekly average46 mg/L≤ 45 mg/L2%
February 2026BOD, 5-day, 20 deg. C, monthly average1338 lb/d≤ 834 lb/d60%
February 2026BOD, 5-day, 20 deg. C, monthly average30 mg/L≤ 10 mg/L200%
February 2026BOD, 5-day, 20 deg. C, maximum weekly average1648 lb/d≤ 1252 lb/d32%
February 2026BOD, 5-day, 20 deg. C, maximum weekly average32 mg/L≤ 15 mg/L113%
February 2026BOD, 5-day, percent removal, minimum63 %≥ 85 %147%
February 2026E. coli, monthly average175 #/100mL≤ 126 #/100mL39%
February 2026Nitrogen, ammonia total [as N], monthly average21 mg/L≤ 2 mg/L950%
February 2026Nitrogen, ammonia total [as N], monthly average885 lb/d≤ 167 lb/d430%
February 2026Nitrogen, ammonia total [as N], maximum weekly average1126 lb/d≤ 250 lb/d350%
February 2026Nitrogen, ammonia total [as N], maximum weekly average30 mg/L≤ 3 mg/L900%
February 2026Solids, suspended percent removal, minimum63 %≥ 85 %147%
March 2026BOD, 5-day, 20 deg. C, monthly average23 mg/L≤ 10 mg/L130%
March 2026BOD, 5-day, 20 deg. C, maximum weekly average34 mg/L≤ 15 mg/L127%
March 2026BOD, 5-day, percent removal, minimum72 %≥ 85 %87%
March 2026Nitrogen, ammonia total [as N], monthly average20 mg/L≤ 2 mg/L900%
March 2026Nitrogen, ammonia total [as N], monthly average711 lb/d≤ 167 lb/d326%
March 2026Nitrogen, ammonia total [as N], maximum weekly average1004 lb/d≤ 250 lb/d302%
March 2026Nitrogen, ammonia total [as N], maximum weekly average32 mg/L≤ 3 mg/L967%
March 2026Solids, suspended percent removal, minimum76 %≥ 85 %60%
April 2026BOD, 5-day, 20 deg. C, monthly average24 mg/L≤ 10 mg/L140%
April 2026BOD, 5-day, 20 deg. C, maximum weekly average31 mg/L≤ 15 mg/L107%
April 2026BOD, 5-day, percent removal, minimum79 %≥ 85 %40%
April 2026Nitrogen, ammonia total [as N], monthly average23 mg/L≤ 2 mg/L1050%
April 2026Nitrogen, ammonia total [as N], monthly average675 lb/d≤ 167 lb/d304%
April 2026Nitrogen, ammonia total [as N], maximum weekly average34 mg/L≤ 3 mg/L1033%
April 2026Nitrogen, ammonia total [as N], maximum weekly average836 lb/d≤ 250 lb/d234%
April 2026Oxygen, dissolved [DO], minimum4.7 mg/L≥ 6 mg/L22%
April 2026Solids, suspended percent removal, minimum75 %≥ 85 %67%
May 2026BOD, 5-day, 20 deg. C, maximum weekly average22 mg/L≤ 15 mg/L47%
June 2026E. coli, monthly average132 #/100mL≤ 126 #/100mL5%
June 2026Solids, suspended percent removal, minimum-63 %≥ 85 %987%
July 2026Oxygen, dissolved [DO], minimum5.3 mg/L≥ 6 mg/L12%

Limits in force (59)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]minimum≥ 6 mg/Lall year
Oxygen, dissolved [DO]minimumreport only (mg/L)all year
Oxygen, dissolved [DO]maximumreport only (mg/L)all year
BOD, 5-day, 20 deg. Cmonthly average≤ 10 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 15 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 834 lb/dall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 1252 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cmaximum weekly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cmonthly averagereport only (lb/d)all year
BOD, 5-day, 20 deg. Cmaximum weekly averagereport only (lb/d)all year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 2503 lb/dall year
Solids, total suspendedmaximum weekly average≤ 3755 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedmaximum weekly averagereport only (mg/L)all year
Solids, total suspendedmonthly averagereport only (lb/d)all year
Solids, total suspendedmaximum weekly averagereport only (lb/d)all year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]maximum weekly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly average≤ 960.14 lb/dall year
Nitrogen, total [as N]maximum weekly average≤ 1440.21 lb/dall year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]maximum weekly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
Nitrogen, total [as N]maximum weekly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/Lall year
Nitrogen, ammonia total [as N]maximum weekly average≤ 3 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 167 lb/dall year
Nitrogen, ammonia total [as N]maximum weekly average≤ 250 lb/dall year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]maximum weekly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]maximum weekly averagereport only (lb/d)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]maximum weekly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly average≤ 247 lb/dall year
Phosphorus, total [as P]maximum weekly average≤ 370.5 lb/dall year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]maximum weekly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Phosphorus, total [as P]maximum weekly averagereport only (lb/d)all year
Copper, total recoverablemonthly average≤ .01 mg/Lall year
Copper, total recoverablemaximum weekly average≤ .016 mg/Lall year
Flow, in conduit or thru treatment plantmonthly average≤ 10 MGDall year
Flow, in conduit or thru treatment plantmaximum weekly averagereport only (MGD)all year
Chlorine, total residualmonthly average≤ .011 mg/Lall year
Chlorine, total residualmaximum weekly average≤ .019 mg/Lall year
E. colimonthly average≤ 126 #/100mLall year
E. colimaximum weekly average≤ 410 #/100mLall year
BOD, 5-day, percent removalminimum≥ 85 %all year
Solids, suspended percent removalminimum≥ 85 %all year
Sludge settleability 30 minuteminimumreport only (mL/L)all year
Sludge settleability 30 minutemaximumreport only (mL/L)all year
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiaminimum≥ 100 %all year
IC25 Static Renewal 7 Day Chronic Pimephalesminimum≥ 100 %all year

New limits from Aug 31, 2028

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], monthly average114 lb/dtighter348 lb/d (11 values)3.05×
Nitrogen, ammonia total [as N], maximum weekly average2.05 mg/Ltighter16 mg/L (11 values)7.8×
Nitrogen, ammonia total [as N], maximum weekly average171 lb/dtighter836 lb/d (11 values)4.89×
Nitrogen, ammonia total [as N], maximum monthly average1.37 mg/Ltighter——

How strict are these limits?

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MS0036145 · MCP: https://passage-data.com/mcp