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Mississippi State Penitentiary Potw, Number 1

Sewage treatment plant, Parchman, Mississippi. NPDES permit MS0029009, in force until Feb 28, 2027. Last 12 months: over a limit 20 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
Renewal application due
Sep 1, 2026 · 180 days before expiry; your permit may set another date
Last report on file
December 2025
Oct 2024 – Sep 2025
9 values over a limit, 0 required values missing, 0 of 1 report late

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

All 20 values over a limit
Period endingParameterReportedLimitOver by
December 2025BOD, 5-day, 20 deg. C, maximum monthly average350 lb/d≤ 66 lb/d430%
December 2025BOD, 5-day, 20 deg. C, maximum monthly average70 mg/L≤ 10 mg/L600%
December 2025BOD, 5-day, 20 deg. C, maximum weekly average350 lb/d≤ 100 lb/d250%
December 2025BOD, 5-day, 20 deg. C, maximum weekly average70 mg/L≤ 15 mg/L367%
December 2025BOD, 5-day, percent removal, minimum75.5 %≥ 85 %63%
December 2025Chlorine, total residual, maximum monthly average.73 mg/L≤ .011 mg/L6536%
December 2025Chlorine, total residual, maximum weekly average2.2 mg/L≤ .019 mg/L11479%
December 2025E. coli, maximum monthly average> 2420 #/100mL≤ 126 #/100mL—
December 2025E. coli, maximum weekly average> 2420 #/100mL≤ 410 #/100mL—
December 2025Flow, in conduit or thru treatment plant, maximum monthly average2.42 MGD≤ .8 MGD203%
December 2025Nitrogen, ammonia total [as N], maximum monthly average10.3 mg/L≤ 2 mg/L415%
December 2025Nitrogen, ammonia total [as N], maximum monthly average61 lb/d≤ 13 lb/d369%
December 2025Nitrogen, ammonia total [as N], maximum weekly average10.3 mg/L≤ 3 mg/L243%
December 2025Nitrogen, ammonia total [as N], maximum weekly average61 lb/d≤ 20 lb/d205%
December 2025Nitrogen, total [as N], maximum monthly average85.65 lb/d≤ 76 lb/d13%
December 2025Solids, suspended percent removal, minimum67.75 %≥ 85 %115%
December 2025Solids, total suspended, maximum monthly average208 mg/L≤ 30 mg/L593%
December 2025Solids, total suspended, maximum monthly average381 lb/d≤ 200 lb/d91%
December 2025Solids, total suspended, maximum weekly average208 mg/L≤ 45 mg/L362%
December 2025Solids, total suspended, maximum weekly average381 lb/d≤ 300 lb/d27%

Limits in force (51)

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≤ 66 lb/dall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 100 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≤ 200 lb/dall year
Solids, total suspendedmaximum weekly average≤ 300 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≤ 76 lb/dall year
Nitrogen, total [as N]maximum weekly average≤ 115 lb/dall 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≤ 2 mg/Lall year
Nitrogen, ammonia total [as N]maximum weekly average≤ 3 mg/Lall year
Nitrogen, ammonia total [as N]maximum monthly average≤ 13 lb/dall year
Nitrogen, ammonia total [as N]maximum weekly average≤ 20 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≤ 35 lb/dall year
Phosphorus, total [as P]maximum weekly average≤ 52 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≤ .8 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≥ 85 %all year
Solids, suspended percent removalminimum≥ 85 %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/MS0029009 · MCP: https://passage-data.com/mcp