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Winona Potw

Sewage treatment plant, major discharger, Winona, Mississippi. NPDES permit MS0021024, in force until Apr 30, 2030. Last 12 months: over a limit 35 times (last September 2026), 303 required values missing, 13 of 16 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (59 values), form Q quarterly
Last report on file
September 2026
Oct 2024 – Sep 2025
34 values over a limit, 2 required values missing, 6 of 15 reports late

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

All 35 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, carbonaceous [5 day, 20 C], monthly average16.3 mg/L≤ 9 mg/L81%
October 2025BOD, carbonaceous [5 day, 20 C], maximum weekly average21 mg/L≤ 13.5 mg/L56%
October 2025Copper, total recoverable, monthly average.159 mg/L≤ .018 mg/L783%
October 2025Copper, total recoverable, maximum weekly average.159 mg/L≤ .025 mg/L536%
October 2025Nitrogen, ammonia total [as N], monthly average40.03 lb/d≤ 20 lb/d100%
October 2025Nitrogen, ammonia total [as N], monthly average9.45 mg/L≤ 2 mg/L373%
October 2025Nitrogen, ammonia total [as N], maximum weekly average15.9 mg/L≤ 3 mg/L430%
October 2025Nitrogen, ammonia total [as N], maximum weekly average64.98 lb/d≤ 30 lb/d117%
November 2025BOD, carbonaceous [5 day, 20 C], monthly average12 mg/L≤ 9 mg/L33%
November 2025BOD, carbonaceous [5 day, 20 C], maximum weekly average21 mg/L≤ 13.5 mg/L56%
November 2025Copper, total recoverable, monthly average.0181 mg/L≤ .018 mg/L1%
November 2025Nitrogen, ammonia total [as N], monthly average26.2 lb/d≤ 20 lb/d31%
November 2025Nitrogen, ammonia total [as N], monthly average6 mg/L≤ 2 mg/L200%
November 2025Nitrogen, ammonia total [as N], maximum weekly average10.1 mg/L≤ 3 mg/L237%
November 2025Nitrogen, ammonia total [as N], maximum weekly average41.86 lb/d≤ 30 lb/d40%
December 2025Nitrogen, ammonia total [as N], monthly average3.2 mg/L≤ 2 mg/L60%
December 2025Nitrogen, ammonia total [as N], maximum weekly average4.46 mg/L≤ 3 mg/L49%
January 2026pH, minimum5.6 SU≥ 6 SU—
February 2026Nitrogen, ammonia total [as N], monthly average2.21 mg/L≤ 2 mg/L11%
February 2026Nitrogen, ammonia total [as N], maximum weekly average3.18 mg/L≤ 3 mg/L6%
March 2026Nitrogen, ammonia total [as N], monthly average25.29 lb/d≤ 20 lb/d26%
March 2026Nitrogen, ammonia total [as N], monthly average25.29 lb/d≤ 20 lb/d26%
March 2026Nitrogen, ammonia total [as N], monthly average4.53 mg/L≤ 2 mg/L127%
March 2026Nitrogen, ammonia total [as N], monthly average4.53 mg/L≤ 2 mg/L127%
March 2026Nitrogen, ammonia total [as N], maximum weekly average30.71 lb/d≤ 30 lb/d2%
March 2026Nitrogen, ammonia total [as N], maximum weekly average30.71 lb/d≤ 30 lb/d2%
March 2026Nitrogen, ammonia total [as N], maximum weekly average8 mg/L≤ 3 mg/L167%
March 2026Nitrogen, ammonia total [as N], maximum weekly average8 mg/L≤ 3 mg/L167%
April 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average20 mg/L≤ 13.5 mg/L48%
April 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average20 mg/L≤ 13.5 mg/L48%
May 2026E. coli, monthly average300 #/100mL≤ 126 #/100mL138%
May 2026E. coli, monthly average300 #/100mL≤ 126 #/100mL138%
September 2026Copper, total recoverable, monthly average.0371 mg/L≤ .018 mg/L106%
September 2026Copper, total recoverable, maximum weekly average.0371 mg/L≤ .025 mg/L48%
September 2026E. coli, maximum weekly average2420 #/100mL≤ 410 #/100mL490%

Limits in force (61)

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
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≤ 300 lb/dall year
Solids, total suspendedmaximum weekly average≤ 450 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 averagereport only (lb/d)all year
Nitrogen, total [as N]maximum 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 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≤ 20 lb/dall year
Nitrogen, ammonia total [as N]maximum weekly average≤ 30 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 averagereport only (lb/d)all year
Phosphorus, total [as P]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 averagereport only (lb/d)all year
Phosphorus, total [as P]maximum weekly averagereport only (lb/d)all year
Zinc, total recoverablemonthly averagereport only (mg/L)all year
Zinc, total recoverablemaximum weekly averagereport only (mg/L)all year
Copper, total recoverablemonthly average≤ .018 mg/Lall year
Copper, total recoverablemaximum weekly average≤ .025 mg/Lall year
Flow, in conduit or thru treatment plantmonthly average≤ 1.2 MGDall year
Flow, in conduit or thru treatment plantmaximum weekly averagereport only (MGD)all year
Chlorine, total residualmonthly average≤ .012 mg/Lall year
Chlorine, total residualmaximum weekly average≤ .021 mg/Lall year
E. colimonthly average≤ 126 #/100mLall year
E. colimaximum weekly average≤ 410 #/100mLall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 9 mg/Lall year
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 13.5 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 90 lb/dall year
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 135 lb/dall year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]maximum weekly averagereport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (lb/d)all year
BOD, carbonaceous [5 day, 20 C]maximum weekly averagereport only (lb/d)all year
BOD, carbonaceous, 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≥ 90.28 %all year
IC25 Static Renewal 7 Day Chronic Pimephalesminimum≥ 90.28 %all year

New limits from Apr 29, 2030

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], monthly average1.5 mg/Ltighter2.21 mg/L (9 values)1.47×
Nitrogen, ammonia total [as N], maximum weekly average2.2 mg/Ltighter3.18 mg/L (9 values)1.45×
Nitrogen, ammonia total [as N], monthly average15 lb/dtighter12.81 lb/d (9 values)0.854×
Nitrogen, ammonia total [as N], maximum weekly average22 lb/dtighter17.34 lb/d (9 values)0.788×

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/MS0021024 · MCP: https://passage-data.com/mcp