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Morton Potw

Sewage treatment plant, major discharger, Morton, Mississippi. NPDES permit MS0036234, in force until Nov 30, 2029. Last 12 months: over a limit 6 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (37 values), form Q quarterly (2 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
13 values over a limit, 0 required values missing, 1 of 15 reports late

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

Period endingParameterReportedLimitOver by
July 2026BOD, 5-day, 20 deg. C, monthly average10.67 mg/L≤ 10 mg/L7%
July 2026Nitrogen, ammonia total [as N], maximum weekly average3.9 mg/L≤ 3 mg/L30%
August 2026BOD, 5-day, 20 deg. C, monthly average15 mg/L≤ 10 mg/L50%
August 2026BOD, 5-day, 20 deg. C, maximum weekly average37 mg/L≤ 15 mg/L147%
August 2026BOD, 5-day, 20 deg. C, maximum weekly average380 lb/d≤ 371.5 lb/d2%
August 2026Solids, suspended percent removal, minimum82 %≥ 85 %20%

Limits in force (41)

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≤ 247.7 lb/dall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 371.5 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
pHminimum≥ 6 SUall year
pHmaximum≤ 9 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≤ 743.1 lb/dall year
Solids, total suspendedmaximum weekly average≤ 1114.6 lb/dall year
Nitrogen, total [as N]monthly average≤ 337.1 lb/dall year
Nitrogen, total [as N]maximum weekly average≤ 505.6 lb/dall 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≤ 49.5 lb/dall year
Nitrogen, ammonia total [as N]maximum weekly average≤ 74.3 lb/dall year
Phosphorus, total [as P]monthly average≤ 138.7 lb/dall year
Phosphorus, total [as P]maximum weekly average≤ 208 lb/dall year
Copper, total recoverablemonthly average≤ .016 mg/Lall year
Copper, total recoverablemaximum weekly average≤ .023 mg/Lall year
Flow, in conduit or thru treatment plantmonthly average≤ 2.97 MGDall year
Flow, in conduit or thru treatment plantmaximum weekly averagereport only (MGD)all year
Chlorine, free availablemonthly average≤ .011 mg/Lall year
Chlorine, free availablemaximum 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
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaminimum≥ 98.71 %all year
%Effect Static Renewal 7Day Chronic Pimephales promelasminimum≥ 98.71 %all year

New limits from Dec 10, 2027

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Chlorine, free available, monthly average0.011 ug/Ltighter——
Chlorine, free available, maximum weekly average0.019 ug/Ltighter——
Nitrogen, ammonia total [as N], monthly average34.4 lb/dtighter3.6 lb/d (12 values)0.105×
Nitrogen, ammonia total [as N], monthly average1.39 mg/Ltighter0.3 mg/L (11 values)0.216×
Nitrogen, ammonia total [as N], maximum weekly average2.1 mg/Ltighter0.9 mg/L (12 values)0.429×
Nitrogen, ammonia total [as N], maximum weekly average51.6 lb/dtighter6 lb/d (12 values)0.116×

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/MS0036234 · MCP: https://passage-data.com/mcp