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Mississippi Band of Choctaw Indians (Standing Pine WWTF)

Sewage treatment plant, Walnut Grove, Mississippi. NPDES permit MS0043494, in force until May 31, 2028. Last 12 months: over a limit 9 times (last February 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 27 days after each period: form 1 quarterly (34 values), form 2 quarterly (8 values)
Renewal application due
Dec 3, 2027 · 180 days before expiry; your permit may set another date
Last report on file
June 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 6 of 16 reports late

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

Period endingParameterReportedLimitOver by
October 2025Solids, suspended percent removal, monthly average minimum78.9 %≥ 85 %41%
October 2025Solids, total suspended, monthly average33 mg/L≤ 30 mg/L10%
November 2025BOD, 5-day, percent removal, monthly average minimum84 %≥ 85 %7%
November 2025Solids, suspended percent removal, monthly average minimum78 %≥ 85 %47%
November 2025Solids, total suspended, monthly average33 mg/L≤ 30 mg/L10%
February 2026E. coli, daily maximum1733 #/100mL≤ 410 #/100mL323%
February 2026Solids, suspended percent removal, monthly average minimum79 %≥ 85 %40%
February 2026Solids, total suspended, monthly average66 mg/L≤ 30 mg/L120%
February 2026Solids, total suspended, weekly average66 mg/L≤ 45 mg/L47%

Limits in force (46)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 6 mg/Lall year
Oxygen, dissolved [DO]daily minimum≥ 6 mg/Lall year
pHdaily minimum≥ 6 SUall year
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]weekly averagereport only (mg/L)all year
Nitrogen, total [as N]weekly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 3 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 3 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 3 mg/LMay–Oct
Nitrogen, ammonia total [as N]weekly average≤ 3 mg/LMay–Oct
Nitrogen, ammonia total [as N]weekly average≤ 4.5 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 4.5 mg/LJan, Feb, Mar, Apr, Nov, Dec
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]weekly averagereport only (mg/L)all year
Phosphorus, total [as P]weekly averagereport only (mg/L)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantweekly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantweekly averagereport only (MGD)all year
Chlorine, total residualdaily maximum≤ .011 mg/Lall year
Chlorine, total residualdaily maximum≤ .011 mg/Lall year
E. colimonthly average≤ 126 #/100mLall year
E. colimonthly average≤ 126 #/100mLall year
E. colidaily maximum≤ 410 #/100mLall year
E. colidaily maximum≤ 410 #/100mLall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 15 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 15 mg/Lall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 22.5 mg/Lall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 22.5 mg/Lall year
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 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/MS0043494 · MCP: https://passage-data.com/mcp