Passage Data · Check a report · Use it from your AI

Bassfield Potw

Sewage treatment plant, Bassfield, Mississippi. NPDES permit MS0024848, in force until Sep 30, 2028. Last 12 months: over a limit 4 times (last December 2025). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form Y yearly
Renewal application due
Apr 3, 2028 · 180 days before expiry; your permit may set another date
Last report on file
December 2025
Oct 2024 – Sep 2025
3 values over a limit, 0 required values missing, 0 of 1 report late

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

Period endingParameterReportedLimitOver by
December 2025Flow, in conduit or thru treatment plant, maximum monthly average.0725 MGD≤ .065 MGD12%
December 2025Nitrogen, ammonia total [as N], maximum monthly average1.99 lb/d≤ 1.34 lb/d49%
December 2025Nitrogen, ammonia total [as N], maximum monthly average6.5 mg/L≤ 2.48 mg/L162%
December 2025Nitrogen, ammonia total [as N], maximum weekly average6.5 mg/L≤ 3.72 mg/L75%

Limits in force (32)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]minimum≥ 6 mg/Lall year
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≤ 16.3 lb/dall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 24.4 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≤ 16.3 lb/dall year
Solids, total suspendedmaximum weekly average≤ 24.4 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, ammonia total [as N]maximum monthly average≤ 2.48 mg/Lall year
Nitrogen, ammonia total [as N]maximum weekly average≤ 3.72 mg/Lall year
Nitrogen, ammonia total [as N]maximum monthly average≤ 1.34 lb/dall year
Nitrogen, ammonia total [as N]maximum weekly average≤ 2.02 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
Flow, in conduit or thru treatment plantmaximum monthly average≤ .065 MGDall 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

New limits from Oct 26, 2026

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], maximum monthly average0.74 lb/dtighter——
Nitrogen, ammonia total [as N], maximum monthly average1.37 mg/Ltighter——
Nitrogen, ammonia total [as N], maximum weekly average2.05 mg/Ltighter——
Nitrogen, ammonia total [as N], maximum weekly average1.11 lb/dtighter——

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

· Save this facility as a site · Superfund sites nearby · Your permits on one board

On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MS0024848 · MCP: https://passage-data.com/mcp