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Isola Potw

Sewage treatment plant, Isola, Mississippi. NPDES permit MS0020109, in force until Jul 31, 2029. Last 12 months: over a limit 7 times (last December 2025), 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
0 values over a limit, 0 required values missing, 1 of 1 report late

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

Period endingParameterReportedLimitOver by
December 2025Chlorine, total residual, maximum monthly average.025 mg/L≤ .011 mg/L127%
December 2025Chlorine, total residual, maximum weekly average.03 mg/L≤ .019 mg/L58%
December 2025E. coli, maximum monthly average> 2420 #/100mL≤ 126 #/100mL—
December 2025E. coli, maximum weekly average> 2420 #/100mL≤ 410 #/100mL—
December 2025Nitrogen, ammonia total [as N], maximum monthly average14.1 mg/L≤ 6 mg/L135%
December 2025Nitrogen, ammonia total [as N], maximum weekly average14.1 mg/L≤ 9 mg/L57%
December 2025Solids, suspended percent removal, minimum52 %≥ 65 %37%

Limits in force (34)

ParameterStatisticLimitMonths
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≤ 55 lb/dall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 82.6 lb/dall 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≤ 165.1 lb/dall year
Solids, total suspendedmaximum weekly average≤ 247.7 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 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≤ 6 mg/Lall year
Nitrogen, ammonia total [as N]maximum weekly average≤ 9 mg/Lall year
Nitrogen, ammonia total [as N]maximum monthly average≤ 11 lb/dall year
Nitrogen, ammonia total [as N]maximum weekly average≤ 16.5 lb/dall 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 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≤ .22 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

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/MS0020109 · MCP: https://passage-data.com/mcp