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Coldwater Potw, North

Sewage treatment plant, Coldwater, Mississippi. NPDES permit MS0026964, in force until Nov 30, 2029. Last 12 months: over a limit 24 times (last December 2025), 41 required values missing, 1 of 1 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form Y yearly
Last report on file
December 2025
Oct 2024 – Sep 2025
12 values over a limit, 0 required values missing, 0 of 1 report late

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

All 24 values over a limit
Period endingParameterReportedLimitOver by
December 2025BOD, 5-day, 20 deg. C, maximum monthly average66 mg/L≤ 30 mg/L120%
December 2025BOD, 5-day, 20 deg. C, maximum monthly average66 mg/L≤ 30 mg/L120%
December 2025BOD, 5-day, 20 deg. C, maximum monthly average92.5 lb/d≤ 34 lb/d172%
December 2025BOD, 5-day, 20 deg. C, maximum monthly average92.5 lb/d≤ 34 lb/d172%
December 2025BOD, 5-day, 20 deg. C, maximum weekly average66 mg/L≤ 45 mg/L47%
December 2025BOD, 5-day, 20 deg. C, maximum weekly average66 mg/L≤ 45 mg/L47%
December 2025BOD, 5-day, 20 deg. C, maximum weekly average92.5 lb/d≤ 51 lb/d81%
December 2025BOD, 5-day, 20 deg. C, maximum weekly average92.5 lb/d≤ 51 lb/d81%
December 2025E. coli, maximum monthly average740 #/100mL≤ 126 #/100mL487%
December 2025E. coli, maximum monthly average740 #/100mL≤ 126 #/100mL487%
December 2025E. coli, maximum weekly average740 #/100mL≤ 410 #/100mL80%
December 2025E. coli, maximum weekly average740 #/100mL≤ 410 #/100mL80%
December 2025Flow, in conduit or thru treatment plant, maximum monthly average.61 MGD≤ .135 MGD352%
December 2025Flow, in conduit or thru treatment plant, maximum monthly average.61 MGD≤ .135 MGD352%
December 2025Nitrogen, ammonia total [as N], maximum monthly average22.5 mg/L≤ 2 mg/L1025%
December 2025Nitrogen, ammonia total [as N], maximum monthly average22.5 mg/L≤ 2 mg/L1025%
December 2025Nitrogen, ammonia total [as N], maximum monthly average36.6 lb/d≤ 2 lb/d1730%
December 2025Nitrogen, ammonia total [as N], maximum monthly average36.6 lb/d≤ 2 lb/d1730%
December 2025Nitrogen, ammonia total [as N], maximum weekly average22.5 mg/L≤ 3 mg/L650%
December 2025Nitrogen, ammonia total [as N], maximum weekly average22.5 mg/L≤ 3 mg/L650%
December 2025Nitrogen, ammonia total [as N], maximum weekly average36.6 lb/d≤ 3 lb/d1120%
December 2025Nitrogen, ammonia total [as N], maximum weekly average36.6 lb/d≤ 3 lb/d1120%
December 2025Solids, total suspended, maximum monthly average131 lb/d≤ 101 lb/d30%
December 2025Solids, total suspended, maximum monthly average131 lb/d≤ 101 lb/d30%

Limits in force (41)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]minimum≥ 6 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 34 lb/dall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 51 lb/dall year
BOD, 5-day, 20 deg. Cmaximum monthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cmaximum weekly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cmaximum monthly 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 suspendedmaximum monthly average≤ 90 mg/Lall year
Solids, total suspendedmaximum weekly average≤ 135 mg/Lall year
Solids, total suspendedmaximum monthly average≤ 101 lb/dall year
Solids, total suspendedmaximum weekly average≤ 152 lb/dall year
Solids, total suspendedmaximum monthly averagereport only (mg/L)all year
Solids, total suspendedmaximum weekly averagereport only (mg/L)all year
Solids, total suspendedmaximum monthly averagereport only (lb/d)all year
Solids, total suspendedmaximum weekly averagereport only (lb/d)all year
Nitrogen, total [as N]maximum weekly averagereport only (mg/L)all year
Nitrogen, total [as N]maximum monthly averagereport only (lb/d)all year
Nitrogen, total [as N]maximum weekly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]maximum monthly average≤ 2 mg/Lall year
Nitrogen, ammonia total [as N]maximum weekly average≤ 3 mg/Lall year
Nitrogen, ammonia total [as N]maximum monthly average≤ 2 lb/dall year
Nitrogen, ammonia total [as N]maximum weekly average≤ 3 lb/dall year
Nitrogen, ammonia total [as N]maximum 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]maximum monthly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]maximum weekly averagereport only (lb/d)all year
Phosphorus, total [as P]maximum weekly averagereport only (mg/L)all year
Phosphorus, total [as P]maximum monthly averagereport only (lb/d)all year
Phosphorus, total [as P]maximum weekly averagereport only (lb/d)all year
Flow, in conduit or thru treatment plantmaximum monthly average≤ .135 MGDall year
Flow, in conduit or thru treatment plantmaximum weekly averagereport only (MGD)all year
Chlorine, total residualmaximum monthly average≤ .011 mg/Lall year
Chlorine, total residualmaximum weekly average≤ .019 mg/Lall year
E. colimaximum monthly average≤ 126 #/100mLall year
E. colimaximum weekly average≤ 410 #/100mLall year
BOD, 5-day, percent removalminimum≥ 65 %all year
Solids, suspended percent removalminimum≥ 65 %all year

New limits from Dec 2, 2027

ParameterNew limitNew or tighterMedian, last 12 months× new limit
BOD, 5-day, 20 deg. C, maximum monthly average5 mg/Ltighter——
BOD, 5-day, 20 deg. C, maximum monthly average5.6 lb/dtighter——
BOD, 5-day, 20 deg. C, maximum weekly average7.5 mg/Ltighter——
BOD, 5-day, 20 deg. C, maximum weekly average8.4 lb/dtighter——
Nitrogen, ammonia total [as N], maximum monthly average1.54 lb/dtighter——
Nitrogen, ammonia total [as N], maximum monthly average1.37 mg/Ltighter——
Nitrogen, ammonia total [as N], maximum weekly average2.3 lb/dtighter——
Nitrogen, ammonia total [as N], maximum weekly average2.05 mg/Ltighter——

How strict are these limits?

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

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