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Sand Creek Wastewater Authority, Sand Creek Potw

Sewage treatment plant, Saltillo, Mississippi. NPDES permit MS0021733 expired Mar 31, 2025; its limits still apply. Last 12 months: over a limit 7 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form Q quarterly (63 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 4 reports late

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

Period endingParameterReportedLimitOver by
December 2025E. coli, monthly average186.15 CFU/100mL≤ 126 CFU/100mL48%
December 2025E. coli, maximum weekly average605 CFU/100mL≤ 410 CFU/100mL48%
June 2026%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia, minimum48.7 %≥ 97.48 %50%
June 2026%Effect Static Renewal 7Day Chronic Pimephales promelas, minimum71.84 %≥ 97.48 %26%
June 2026E. coli, monthly average171.58 CFU/100mL≤ 126 CFU/100mL36%
June 2026E. coli, maximum weekly average1986 CFU/100mL≤ 410 CFU/100mL384%
September 2026E. coli, monthly average213 CFU/100mL≤ 126 CFU/100mL69%

Limits in force (72)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]minimum≥ 6 mg/Lall year
Oxygen, dissolved [DO]minimum≥ 6 mg/Lall year
Oxygen, dissolved [DO]minimumreport only (mg/L)all year
Oxygen, dissolved [DO]maximumreport only (mg/L)all year
BOD, 5-day, 20 deg. Cmonthly average≤ 6 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 6 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 9 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 9 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 74.8 lb/dall year
BOD, 5-day, 20 deg. Cmonthly average≤ 160 lb/dall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 112 lb/dall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 240 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cmaximum weekly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cmonthly 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 suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall year
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 375 lb/dall year
Solids, total suspendedmonthly average≤ 800 lb/dall year
Solids, total suspendedmaximum weekly average≤ 562 lb/dall year
Solids, total suspendedmaximum weekly average≤ 1201 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedmaximum weekly averagereport only (mg/L)all year
Solids, total suspendedmonthly averagereport only (lb/d)all year
Solids, total suspendedmaximum weekly averagereport only (lb/d)all year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]maximum weekly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly average≤ 130 lb/dall year
Nitrogen, total [as N]maximum weekly average≤ 195 lb/dall year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]maximum weekly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
Nitrogen, total [as N]maximum weekly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/Lall year
Nitrogen, ammonia total [as N]maximum weekly average≤ 3 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 53 lb/dall year
Nitrogen, ammonia total [as N]maximum weekly average≤ 80 lb/dall year
Nitrogen, ammonia total [as N]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]monthly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]maximum weekly averagereport only (lb/d)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]maximum weekly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly average≤ 56 lb/dall year
Phosphorus, total [as P]maximum weekly average≤ 84 lb/dall year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]maximum weekly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Phosphorus, total [as P]maximum weekly averagereport only (lb/d)all year
Cyanide, free [amenable to chlorination]monthly average≤ .0053 mg/Lall year
Cyanide, free [amenable to chlorination]maximum weekly average≤ .023 mg/Lall year
Zinc, total recoverablemonthly average≤ .1446 mg/Lall year
Zinc, total recoverablemaximum weekly average≤ .1446 mg/Lall year
Copper, total recoverablemonthly average≤ .011 mg/Lall year
Copper, total recoverablemaximum weekly average≤ .01688 mg/Lall year
Flow, in conduit or thru treatment plantmonthly average≤ 3.2 MGDall year
Flow, in conduit or thru treatment plantmaximum monthly averagereport only (MGD)all year
Chlorine, total residualmonthly average≤ .011 mg/Lall year
Chlorine, total residualmaximum weekly average≤ .019 mg/Lall year
E. colimonthly average≤ 126 CFU/100mLall year
E. colimaximum weekly average≤ 410 CFU/100mLall year
BOD, 5-day, percent removalminimum≥ 85 %all year
Solids, suspended percent removalminimum≥ 85 %all year
Sludge settleability 30 minuteminimumreport only (mL/L)all year
Sludge settleability 30 minutemaximumreport only (mL/L)all year
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaminimum≥ 97.48 %all year
%Effect Static Renewal 7Day Chronic Pimephales promelasminimum≥ 97.48 %all year

How strict are these limits?

Cited limits by parameter: Mississippi's rules and the federal ones.

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Your permit document is the final word. As JSON: /api/v1/permits/MS0021733 · MCP: https://passage-data.com/mcp