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Mississippi Band of Choctaw Indians (New Harmony WWTF)

Sewage treatment plant, Philadelphia, Mississippi. NPDES permit MS0058645, in force until Mar 31, 2030. Last 12 months: over a limit 7 times (last May 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form 1 quarterly (50 values), form Q quarterly (4 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
26 values over a limit, 10 required values missing, 0 of 16 reports late

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

Period endingParameterReportedLimitOver by
November 2025BOD, carbonaceous [5 day, 20 C], weekly average19.99 lb/d≤ 16.26 lb/d23%
December 2025Solids, total suspended, weekly average67.98 lb/d≤ 48.79 lb/d39%
January 2026BOD, carbonaceous [5 day, 20 C], monthly average12.38 lb/d≤ 10.84 lb/d14%
January 2026BOD, carbonaceous [5 day, 20 C], weekly average34.28 lb/d≤ 16.26 lb/d111%
January 2026Nitrogen, ammonia total [as N], weekly average8.04 lb/d≤ 3.25 lb/d147%
January 2026Solids, total suspended, weekly average55.81 lb/d≤ 48.79 lb/d14%
May 2026Solids, total suspended, weekly average73.06 lb/d≤ 48.79 lb/d50%

Limits in force (54)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheitdaily minimumreport only (deg F)Jun–Sep
Temperature, water deg. fahrenheitdaily averagereport only (deg F)Jun–Sep
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)Jun–Sep
Temperature, water deg. fahrenheitdaily minimumreport only (deg F)Jun–Sep
Temperature, water deg. fahrenheitdaily averagereport only (deg F)Jun–Sep
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)Jun–Sep
Oxygen, dissolved [DO]daily minimum≥ 6 mg/Lall year
Oxygen, dissolved [DO]daily minimumreport only (mg/L)Jun–Sep
Oxygen, dissolved [DO]daily averagereport only (mg/L)Jun–Sep
Oxygen, dissolved [DO]daily maximumreport only (mg/L)Jun–Sep
Oxygen, dissolved [DO]daily minimumreport only (mg/L)Jun–Sep
Oxygen, dissolved [DO]daily averagereport only (mg/L)Jun–Sep
Oxygen, dissolved [DO]daily maximumreport only (mg/L)Jun–Sep
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
pHdaily minimumreport only (SU)Jun–Sep
pHdaily maximumreport only (SU)Jun–Sep
pHdaily minimumreport only (SU)Jun–Sep
pHdaily maximumreport only (SU)Jun–Sep
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 32.53 lb/dall year
Solids, total suspendedweekly average≤ 48.79 lb/dall 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, total [as N]monthly averagereport only (mg/L)Jun–Sep
Nitrogen, total [as N]weekly averagereport only (mg/L)Jun–Sep
Nitrogen, total [as N]monthly averagereport only (mg/L)Jun–Sep
Nitrogen, total [as N]weekly averagereport only (mg/L)Jun–Sep
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/Lall year
Nitrogen, ammonia total [as N]weekly average≤ 3 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 2.17 lb/dall year
Nitrogen, ammonia total [as N]weekly average≤ 3.25 lb/dall year
Phosphorus, total [as P]monthly 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 plantweekly averagereport only (MGD)all year
Chlorine, total residualdaily maximum≤ .011 mg/Lall year
E. colimonthly average≤ 126 #/100mLall year
E. colidaily maximum≤ 410 #/100mLall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10.84 lb/dall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 16.26 lb/dall year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
NOEL Static Renewal 7Day Chronic Ceriodaphnia dubiaminimum≥ 100 %all year
NOEL Static Renewal 7Day Chronic Ceriodaphnia dubiaminimum≥ 100 %all year
Noel Statre 7Day Chronic Pimephalesminimum≥ 100 %all year
Noel Statre 7Day Chronic Pimephalesminimum≥ 100 %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/MS0058645 · MCP: https://passage-data.com/mcp