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City of Memphis

Sewage treatment plant, major discharger, Memphis, Tennessee. NPDES permit TN0020729 expired Dec 31, 2016; its limits still apply. Last 12 months: over a limit 73 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form G monthly (70 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
126 values over a limit, 0 required values missing, 0 of 12 reports late

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

All 73 values over a limit
Period endingParameterReportedLimitOver by
October 2025Oxygen, dissolved [DO], instantaneous minimum.5 mg/L≥ 1 mg/L50%
October 2025Solids, settleable, daily maximum14 mL/L≤ 1 mL/L1300%
October 2025Solids, total suspended, daily maximum141 mg/L≤ 96 mg/L47%
October 2025pH, minimum5.11 SU≥ 6 SU—
November 2025BOD, 5-day, 20 deg. C, daily maximum164 mg/L≤ 84 mg/L95%
November 2025BOD, 5-day, 20 deg. C, monthly average44 mg/L≤ 42 mg/L5%
November 2025BOD, 5-day, 20 deg. C, weekly average68 mg/L≤ 63 mg/L8%
November 2025Solids, settleable, daily maximum2 mL/L≤ 1 mL/L100%
November 2025Solids, total suspended, daily maximum188 mg/L≤ 96 mg/L96%
November 2025Solids, total suspended, weekly average78 mg/L≤ 72 mg/L8%
December 2025BOD, 5-day, 20 deg. C, daily maximum146 mg/L≤ 84 mg/L74%
December 2025BOD, 5-day, 20 deg. C, monthly average48 mg/L≤ 42 mg/L14%
December 2025BOD, 5-day, 20 deg. C, weekly average87 mg/L≤ 63 mg/L38%
December 2025Solids, settleable, daily maximum2 mL/L≤ 1 mL/L100%
December 2025Solids, total suspended, daily maximum217 mg/L≤ 96 mg/L126%
December 2025Solids, total suspended, monthly average55 mg/L≤ 48 mg/L15%
December 2025Solids, total suspended, weekly average103 mg/L≤ 72 mg/L43%
January 2026Solids, settleable, daily maximum1.5 mL/L≤ 1 mL/L50%
February 2026BOD, 5-day, 20 deg. C, daily maximum475 mg/L≤ 84 mg/L465%
February 2026BOD, 5-day, 20 deg. C, monthly average42684 lb/d≤ 31525 lb/d35%
February 2026BOD, 5-day, 20 deg. C, monthly average88 mg/L≤ 42 mg/L110%
February 2026BOD, 5-day, 20 deg. C, weekly average146 mg/L≤ 63 mg/L132%
February 2026BOD, 5-day, 20 deg. C, weekly average89162 lb/d≤ 47288 lb/d89%
February 2026Oxygen, dissolved [DO], instantaneous minimum.2 mg/L≥ 1 mg/L80%
February 2026Solids, settleable, daily maximum60 mL/L≤ 1 mL/L5900%
February 2026Solids, suspended percent removal, daily minimum-74 %≥ 40 %190%
February 2026Solids, suspended percent removal, monthly average minimum76 %≥ 85 %60%
February 2026Solids, total suspended, daily maximum409 mg/L≤ 96 mg/L326%
February 2026Solids, total suspended, monthly average53584 lb/d≤ 36029 lb/d49%
February 2026Solids, total suspended, monthly average95 mg/L≤ 48 mg/L98%
February 2026Solids, total suspended, weekly average120348 lb/d≤ 54043 lb/d123%
February 2026Solids, total suspended, weekly average196 mg/L≤ 72 mg/L172%
March 2026BOD, 5-day, 20 deg. C, daily maximum108 mg/L≤ 84 mg/L29%
March 2026Oxygen, dissolved [DO], instantaneous minimum.3 mg/L≥ 1 mg/L70%
March 2026Solids, settleable, daily maximum32 mL/L≤ 1 mL/L3100%
March 2026Solids, suspended percent removal, daily minimum27 %≥ 40 %22%
March 2026Solids, suspended percent removal, monthly average minimum83 %≥ 85 %13%
March 2026Solids, total suspended, daily maximum220 mg/L≤ 96 mg/L129%
March 2026Solids, total suspended, monthly average61 mg/L≤ 48 mg/L27%
March 2026Solids, total suspended, weekly average56424 lb/d≤ 54043 lb/d4%
March 2026Solids, total suspended, weekly average85 mg/L≤ 72 mg/L18%
March 2026pH, minimum5.85 SU≥ 6 SU—
April 2026Solids, settleable, daily maximum6 mL/L≤ 1 mL/L500%
May 2026BOD, 5-day, 20 deg. C, daily maximum195 mg/L≤ 84 mg/L132%
May 2026BOD, 5-day, 20 deg. C, monthly average40732 lb/d≤ 31525 lb/d29%
May 2026BOD, 5-day, 20 deg. C, monthly average75 mg/L≤ 42 mg/L79%
May 2026BOD, 5-day, 20 deg. C, weekly average47877 lb/d≤ 47288 lb/d1%
May 2026BOD, 5-day, 20 deg. C, weekly average91 mg/L≤ 63 mg/L44%
May 2026Solids, settleable, daily maximum150 mL/L≤ 1 mL/L14900%
May 2026Solids, suspended percent removal, daily minimum-38 %≥ 40 %130%
May 2026Solids, suspended percent removal, monthly average minimum63 %≥ 85 %147%
May 2026Solids, total suspended, daily maximum557 mg/L≤ 96 mg/L480%
May 2026Solids, total suspended, monthly average139 mg/L≤ 48 mg/L190%
May 2026Solids, total suspended, monthly average76864 lb/d≤ 36029 lb/d113%
May 2026Solids, total suspended, weekly average102356 lb/d≤ 54043 lb/d89%
May 2026Solids, total suspended, weekly average163 mg/L≤ 72 mg/L126%
June 2026BOD, 5-day, 20 deg. C, daily maximum97 mg/L≤ 84 mg/L15%
June 2026BOD, 5-day, 20 deg. C, monthly average46 mg/L≤ 42 mg/L10%
June 2026BOD, 5-day, 20 deg. C, weekly average65 mg/L≤ 63 mg/L3%
June 2026Solids, settleable, daily maximum24 mL/L≤ 1 mL/L2300%
June 2026Solids, total suspended, daily maximum134 mg/L≤ 96 mg/L40%
June 2026Solids, total suspended, weekly average79 mg/L≤ 72 mg/L10%
July 2026BOD, 5-day, 20 deg. C, daily maximum203 mg/L≤ 84 mg/L142%
July 2026BOD, 5-day, 20 deg. C, monthly average55 mg/L≤ 42 mg/L31%
July 2026BOD, 5-day, 20 deg. C, weekly average49750 lb/d≤ 47288 lb/d5%
July 2026BOD, 5-day, 20 deg. C, weekly average92 mg/L≤ 63 mg/L46%
July 2026Solids, settleable, daily maximum62 mL/L≤ 1 mL/L6100%
July 2026Solids, suspended percent removal, daily minimum-62 %≥ 40 %170%
July 2026Solids, suspended percent removal, monthly average minimum82 %≥ 85 %20%
July 2026Solids, total suspended, daily maximum343 mg/L≤ 96 mg/L257%
July 2026Solids, total suspended, monthly average57 mg/L≤ 48 mg/L19%
July 2026Solids, total suspended, weekly average122 mg/L≤ 72 mg/L69%
July 2026Solids, total suspended, weekly average65603 lb/d≤ 54043 lb/d21%

Limits in force (70)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 1 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 42 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 63 mg/Lall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 84 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 31525 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 47288 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 48 mg/Lall year
Solids, total suspendedweekly average≤ 72 mg/Lall year
Solids, total suspendeddaily maximum≤ 96 mg/Lall year
Solids, total suspendedmonthly average≤ 36029 lb/dall year
Solids, total suspendedweekly average≤ 54043 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Solids, settleabledaily maximum≤ 1 mL/Lall year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
Nitrogen, total [as N]monthly averagereport only (%)all year
Nitrogen, organic total [as N]monthly averagereport only (mg/L)all year
Nitrogen, organic total [as N]daily maximumreport only (mg/L)all year
Nitrogen, organic total [as N]monthly averagereport only (lb/d)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Phosphorus, total [as P]monthly averagereport only (%)all year
Dioxinmonthly average≤ 1 pg/Lall year
Dioxindaily maximum≤ 1 pg/Lall year
Benzidinemonthly averagereport only (mg/L)all year
Benzidinedaily maximumreport only (mg/L)all year
Polychlorinated biphenyls [PCBs]monthly average≤ .00000064 mg/Lall year
Polychlorinated biphenyls [PCBs]daily maximum≤ .00000064 mg/Lall year
Hexachlorobenzenemonthly averagereport only (mg/L)all year
Hexachlorobenzenedaily maximumreport only (mg/L)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualinstantaneous maximum≤ 2 mg/Lall year
Chlordanemonthly average≤ .0000081 mg/Lall year
Chlordanedaily maximum≤ .0000081 mg/Lall year
E. colimonthly averagereport only (CFU/100mL)all year
E. colidaily maximumreport only (CFU/100mL)all year
E. colimonthly geometric mean≤ 126 CFU/100mLall year
E. colidaily maximum≤ 487 CFU/100mLall year
Sewer Backupsmonthly totalreport only (occur/mo)all year
Mercury, total [as Hg]monthly averagereport only (mg/L)all year
Mercury, total [as Hg]daily maximumreport only (mg/L)all year
Overflowsmonthly totalreport only (occur/mo)all year
Overflowsmonthly totalreport only (occur/mo)all year
Organic pesticide chemicals [40 CFR455]monthly averagereport only (mg/L)all year
Organic pesticide chemicals [40 CFR455]daily maximumreport only (mg/L)all year
Methylmercurymonthly averagereport only (mg/L)all year
Methylmercurydaily maximumreport only (mg/L)all year
Bypass valvemonthly totalreport only (occur/mo)all year
BOD, 5-day, percent removaldaily minimum≥ 40 %all year
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removaldaily minimum≥ 40 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
LC50 Static 48Hr Acute Ceriodaphnia dubiavaluereport only (%)all year
LC50 Static 48Hr Acute Pimephales promelasvaluereport only (%)all year

How strict are these limits?

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

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Your permit document is the final word. As JSON: /api/v1/permits/TN0020729 · MCP: https://passage-data.com/mcp