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Noxapater Potw, South

Sewage treatment plant, Noxapater, Mississippi. NPDES permit MS0021628, in force until Apr 30, 2028. Last 12 months: over a limit once (last December 2025). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form Y yearly
Renewal application due
Nov 2, 2027 · 180 days before expiry; your permit may set another date
Last report on file
December 2025
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 0 of 1 report late

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

Period endingParameterReportedLimitOver by
December 2025Nitrogen, ammonia total [as N], maximum monthly average2.28 mg/L≤ 2 mg/L14%

Limits in force (43)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]minimum≥ 6 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 10 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 15 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 5 lb/dall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 7.5 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≤ 30 mg/Lall year
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall year
Solids, total suspendedmaximum monthly average≤ 15 lb/dall year
Solids, total suspendedmaximum weekly average≤ 22.5 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 monthly averagereport only (mg/L)all year
Nitrogen, total [as N]maximum weekly averagereport only (mg/L)all year
Nitrogen, total [as N]maximum monthly average≤ 5.76 lb/dall year
Nitrogen, total [as N]maximum weekly average≤ 8.64 lb/dall 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≤ 1 lb/dall year
Nitrogen, ammonia total [as N]maximum weekly average≤ 1.5 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 monthly averagereport only (mg/L)all year
Phosphorus, total [as P]maximum weekly averagereport only (mg/L)all year
Phosphorus, total [as P]maximum monthly average≤ 2.6 lb/dall year
Phosphorus, total [as P]maximum weekly average≤ 3.9 lb/dall year
Flow, in conduit or thru treatment plantmaximum monthly average≤ .06 MGDall year
Flow, in conduit or thru treatment plantmaximum weekly averagereport only (MGD)all year
Chlorine, total residualmaximum monthly average≤ .013 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≥ 85 %all year
Solids, suspended percent removalminimum≥ 85 %all year

New limits from Apr 29, 2028

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], maximum monthly average1.37 mg/Ltighter——
Nitrogen, ammonia total [as N], maximum monthly average0.68 lb/dtighter——
Nitrogen, ammonia total [as N], maximum weekly average1.02 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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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MS0021628 · MCP: https://passage-data.com/mcp