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Desoto County Regional Utility Authority, Metro Desoto WWTP

Sewage treatment plant, Olive Branch, Mississippi. NPDES permit MS0028479, in force until May 31, 2029. Last 12 months: over a limit 56 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (59 values), form Q quarterly (2 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
56 values over a limit, 2 required values missing, 1 of 16 reports late

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

All 56 values over a limit
Period endingParameterReportedLimitOver by
October 2025Cadmium, total recoverable, monthly average.006 mg/L≤ .00046 mg/L1204%
October 2025Cadmium, total recoverable, maximum weekly average.006 mg/L≤ .00485 mg/L24%
October 2025Nitrogen, ammonia total [as N], monthly average17.3 lb/d≤ 11.43 lb/d51%
October 2025Nitrogen, ammonia total [as N], monthly average5.8 mg/L≤ 1.37 mg/L323%
October 2025Nitrogen, ammonia total [as N], maximum weekly average12.6 mg/L≤ 2.05 mg/L515%
October 2025Nitrogen, ammonia total [as N], maximum weekly average25 lb/d≤ 17.14 lb/d46%
November 2025BOD, 5-day, 20 deg. C, monthly average17 mg/L≤ 16 mg/L6%
November 2025BOD, 5-day, 20 deg. C, maximum weekly average35 mg/L≤ 24 mg/L46%
November 2025Cadmium, total recoverable, monthly average.00145 mg/L≤ .00046 mg/L215%
November 2025Nitrogen, ammonia total [as N], monthly average2.6 mg/L≤ 1.37 mg/L90%
November 2025Nitrogen, ammonia total [as N], maximum weekly average5.59 mg/L≤ 2.05 mg/L173%
December 2025%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia, minimum4.001 %≥ 100 %96%
December 2025BOD, 5-day, 20 deg. C, maximum weekly average33 mg/L≤ 24 mg/L38%
December 2025Cadmium, total recoverable, monthly average.0034 mg/L≤ .00046 mg/L639%
December 2025Nitrogen, ammonia total [as N], monthly average3.15 mg/L≤ 1.37 mg/L130%
December 2025Nitrogen, ammonia total [as N], maximum weekly average5.18 mg/L≤ 2.05 mg/L153%
January 2026BOD, 5-day, 20 deg. C, maximum weekly average29 mg/L≤ 24 mg/L21%
January 2026Cadmium, total recoverable, monthly average.002 mg/L≤ .00046 mg/L335%
January 2026Copper, total recoverable, monthly average.0317 mg/L≤ .0194 mg/L63%
January 2026Copper, total recoverable, maximum weekly average.0317 mg/L≤ .0315 mg/L1%
January 2026Nitrogen, ammonia total [as N], monthly average2.9 mg/L≤ 1.37 mg/L112%
January 2026Nitrogen, ammonia total [as N], maximum weekly average19 lb/d≤ 17.14 lb/d11%
January 2026Nitrogen, ammonia total [as N], maximum weekly average8.07 mg/L≤ 2.05 mg/L294%
February 2026BOD, 5-day, 20 deg. C, maximum weekly average44 mg/L≤ 24 mg/L83%
February 2026Cadmium, total recoverable, monthly average.0131 mg/L≤ .00046 mg/L2748%
February 2026Cadmium, total recoverable, maximum weekly average.0131 mg/L≤ .00485 mg/L170%
February 2026Nitrogen, ammonia total [as N], monthly average1.7 mg/L≤ 1.37 mg/L24%
February 2026Nitrogen, ammonia total [as N], maximum weekly average2.31 mg/L≤ 2.05 mg/L13%
March 2026%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia, minimum1.363 %≥ 100 %99%
March 2026%Effect Static Renewal 7Day Chronic Pimephales promelas, minimum14.9 %≥ 100 %85%
March 2026Cadmium, total recoverable, monthly average.0007 mg/L≤ .00046 mg/L52%
April 2026Cadmium, total recoverable, monthly average.00089 mg/L≤ .00046 mg/L93%
April 2026Nitrogen, ammonia total [as N], monthly average1.69 mg/L≤ 1.37 mg/L23%
April 2026Nitrogen, ammonia total [as N], maximum weekly average2.98 mg/L≤ 2.05 mg/L45%
April 2026pH, minimum5.5 SU≥ 6 SU—
May 2026Cadmium, total recoverable, monthly average.0011 mg/L≤ .00046 mg/L139%
June 2026%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia, minimum52.74 %≥ 100 %47%
June 2026%Effect Static Renewal 7Day Chronic Pimephales promelas, minimum59.5 %≥ 100 %41%
June 2026Nitrogen, ammonia total [as N], monthly average1.69 mg/L≤ 1.37 mg/L23%
June 2026Nitrogen, ammonia total [as N], maximum weekly average17.8 lb/d≤ 17.14 lb/d4%
June 2026Nitrogen, ammonia total [as N], maximum weekly average6 mg/L≤ 2.05 mg/L193%
July 2026Cadmium, total recoverable, monthly average.000609 mg/L≤ .00046 mg/L32%
July 2026Nitrogen, ammonia total [as N], monthly average2.33 mg/L≤ 1.37 mg/L70%
July 2026Nitrogen, ammonia total [as N], maximum weekly average3.52 mg/L≤ 2.05 mg/L72%
August 2026Cadmium, total recoverable, monthly average.000721 mg/L≤ .00046 mg/L57%
August 2026Nitrogen, ammonia total [as N], monthly average26.7 lb/d≤ 11.43 lb/d134%
August 2026Nitrogen, ammonia total [as N], monthly average8.56 mg/L≤ 1.37 mg/L525%
August 2026Nitrogen, ammonia total [as N], maximum weekly average35 lb/d≤ 17.14 lb/d104%
August 2026Nitrogen, ammonia total [as N], maximum weekly average9.51 mg/L≤ 2.05 mg/L364%
September 2026%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia, minimum6.371 %≥ 100 %94%
September 2026%Effect Static Renewal 7Day Chronic Pimephales promelas, minimum26.84 %≥ 100 %73%
September 2026Cadmium, total recoverable, monthly average.000577 mg/L≤ .00046 mg/L25%
September 2026Nitrogen, ammonia total [as N], monthly average24.4 lb/d≤ 11.43 lb/d113%
September 2026Nitrogen, ammonia total [as N], monthly average8.75 mg/L≤ 1.37 mg/L539%
September 2026Nitrogen, ammonia total [as N], maximum weekly average12.1 mg/L≤ 2.05 mg/L490%
September 2026Nitrogen, ammonia total [as N], maximum weekly average35 lb/d≤ 17.14 lb/d104%

Limits in force (97)

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]minimumreport only (mg/L)all year
Oxygen, dissolved [DO]maximumreport only (mg/L)all year
Oxygen, dissolved [DO]maximumreport only (mg/L)all year
BOD, 5-day, 20 deg. Cmonthly average≤ 10 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 16 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 15 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 24 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 45 lb/dall year
BOD, 5-day, 20 deg. Cmonthly average≤ 133 lb/dall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 67 lb/dall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 200 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all 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. 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. Cmonthly averagereport only (lb/d)all year
BOD, 5-day, 20 deg. Cmaximum weekly 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≤ 134 lb/dall year
Solids, total suspendedmonthly average≤ 250 lb/dall year
Solids, total suspendedmaximum weekly average≤ 202 lb/dall year
Solids, total suspendedmaximum weekly average≤ 375 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedmaximum weekly 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 suspendedmonthly averagereport only (lb/d)all year
Solids, total suspendedmaximum weekly averagereport only (lb/d)all year
Solids, total suspendedmaximum weekly averagereport only (lb/d)all year
Oil & Greasemonthly average≤ 10 mg/Lall year
Oil & Greasemaximum weekly average≤ 15 mg/Lall year
Nitrogen, total [as N]monthly average≤ 96 lb/dall year
Nitrogen, total [as N]maximum weekly average≤ 144 lb/dall 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]monthly average≤ 1.37 mg/Lall year
Nitrogen, ammonia total [as N]maximum weekly average≤ 3 mg/Lall year
Nitrogen, ammonia total [as N]maximum weekly average≤ 2.05 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 9 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 11.43 lb/dall year
Nitrogen, ammonia total [as N]maximum weekly average≤ 13 lb/dall year
Nitrogen, ammonia total [as N]maximum weekly average≤ 17.14 lb/dall year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all 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]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]monthly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]maximum weekly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]maximum weekly averagereport only (lb/d)all year
Phosphorus, total [as P]monthly average≤ 27 lb/dall year
Phosphorus, total [as P]maximum weekly average≤ 40 lb/dall year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Phosphorus, total [as P]maximum weekly averagereport only (lb/d)all year
Zinc, total recoverablemonthly averagereport only (mg/L)all year
Zinc, total recoverablemaximum weekly averagereport only (mg/L)all year
Cadmium, total recoverablemonthly average≤ .00046 mg/Lall year
Cadmium, total recoverablemaximum weekly average≤ .00485 mg/Lall year
Lead, total recoverablemonthly average≤ .0066 mg/Lall year
Lead, total recoverablemaximum weekly average≤ .1702 mg/Lall year
Copper, total recoverablemonthly average≤ .0194 mg/Lall year
Copper, total recoverablemaximum weekly average≤ .0315 mg/Lall year
Flow, in conduit or thru treatment plantmaximum weekly average≤ .537 MGDall year
Flow, in conduit or thru treatment plantmonthly average≤ 1 MGDall year
Flow, in conduit or thru treatment plantmaximum weekly averagereport only (MGD)all year
Chlorine, total residualmonthly average≤ .017 mg/Lall year
Chlorine, total residualmonthly average≤ .011 mg/Lall year
Chlorine, total residualmaximum weekly average≤ .03 mg/Lall year
Chlorine, total residualmaximum weekly average≤ .019 mg/Lall year
E. colimonthly average≤ 126 #/100mLall year
E. colimonthly average≤ 126 #/100mLall year
E. colimaximum weekly average≤ 410 #/100mLall year
E. colimaximum weekly average≤ 410 #/100mLall year
Mercury, total recoverablemonthly average≤ .000012 mg/Lall year
Mercury, total recoverablemaximum weekly average≤ .0021 mg/Lall year
BOD, 5-day, percent removalminimumreport only (%)all year
BOD, 5-day, percent removalminimum≥ 85 %all year
Solids, suspended percent removalminimumreport only (%)all year
Solids, suspended percent removalminimum≥ 85 %all year
Sludge settleability 30 minuteminimumreport only (mL/L)all year
Sludge settleability 30 minuteminimumreport only (mg/L)all year
Sludge settleability 30 minutemaximumreport only (mL/L)all year
Sludge settleability 30 minutemaximumreport only (mg/L)all year
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaminimum≥ 100 %all year
%Effect Static Renewal 7Day Chronic Pimephales promelasminimum≥ 100 %all year

How strict are these limits?

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MS0028479 · MCP: https://passage-data.com/mcp