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Florence Potw

Sewage treatment plant, Florence, Mississippi. NPDES permit MS0025275, in force until Dec 31, 2028. Last 12 months: over a limit 3 times (last March 2026), 6 of 13 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (49 values), form S twice a year
Last report on file
August 2026
Oct 2024 – Sep 2025
5 values over a limit, 0 required values missing, 6 of 14 reports late

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

Period endingParameterReportedLimitOver by
January 2026E. coli, monthly average980 #/100mL≤ 126 #/100mL678%
January 2026E. coli, maximum weekly average980 #/100mL≤ 410 #/100mL139%
March 2026Solids, suspended percent removal, minimum71 %≥ 85 %93%

Limits in force (55)

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≤ 6 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 9 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 20.9 lb/dall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 31.3 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≤ 187.7 lb/dall year
Solids, total suspendedmaximum weekly average≤ 281.5 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)Jan, Feb, Mar, Apr, May, Dec
Nitrogen, total [as N]maximum weekly averagereport only (mg/L)Jan, Feb, Mar, Apr, May, Dec
Nitrogen, total [as N]monthly averagereport only (lb/d)Jan, Feb, Mar, Apr, May, Dec
Nitrogen, total [as N]maximum weekly averagereport only (lb/d)Jan, Feb, Mar, Apr, May, Dec
Nitrogen, ammonia total [as N]monthly average≤ 1 mg/Lall year
Nitrogen, ammonia total [as N]maximum weekly average≤ 1.5 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 6.23 lb/dall year
Nitrogen, ammonia total [as N]maximum weekly average≤ 9.34 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
Cyanide, free [amenable to chlorination]monthly average≤ .0063 mg/Lall year
Cyanide, free [amenable to chlorination]maximum weekly average≤ .026 mg/Lall year
Zinc, total recoverablemonthly average≤ .0792 mg/Lall year
Zinc, total recoverablemaximum weekly average≤ .0792 mg/Lall year
Lead, total recoverablemonthly average≤ .00147 mg/Lall year
Lead, total recoverablemaximum weekly average≤ .0365 mg/Lall year
Flow, in conduit or thru treatment plantmonthly average≤ .75 MGDall year
Flow, in conduit or thru treatment plantmaximum weekly averagereport only (MGD)all year
Chlorine, total residualmonthly average≤ .013 mg/Lall year
Chlorine, total residualmaximum weekly average≤ .023 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≥ 82 %all year
%Effect Static Renewal 7Day Chronic Pimephales promelasminimum≥ 82 %all year

New limits from Jan 5, 2027

ParameterNew limitNew or tighterMedian, last 12 months× new limit
BOD, 5-day, 20 deg. C, monthly average5 mg/Ltighter4 mg/L (3 values)0.8×
BOD, 5-day, 20 deg. C, maximum weekly average7.5 mg/Ltighter4 mg/L (3 values)0.533×

How strict are these limits?

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

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MS0025275 · MCP: https://passage-data.com/mcp