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Metro Water Services - Nashville Central STP

Sewage treatment plant, major discharger, Nashville, Tennessee. NPDES permit TN0020575 expired Oct 31, 2025; its limits still apply. Last 12 months: over a limit 20 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form G monthly (53 values), outfall 019 form G monthly (6 values), outfall 01A form G monthly (27 values), outfall 023 form G monthly (6 values), outfall 024 form G monthly (6 values), outfall 033 form G monthly (6 values), and 4 more forms
Last report on file
September 2026
Oct 2024 – Sep 2025
25 values over a limit, 0 required values missing, 0 of 120 reports late

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

All 20 values over a limit
Period endingParameterReportedLimitOver by
October 2025SSO, Dry Weather, monthly total3 occur/mo≤ 0 occur/mo—
October 2025SSO, Wet Weather, monthly total2 occur/mo≤ 0 occur/mo—
December 2025SSO, Dry Weather, monthly total3 occur/mo≤ 0 occur/mo—
December 2025SSO, Wet Weather, monthly total7 occur/mo≤ 0 occur/mo—
January 2026SSO, Dry Weather, monthly total7 occur/mo≤ 0 occur/mo—
January 2026SSO, Wet Weather, monthly total19 occur/mo≤ 0 occur/mo—
February 2026SSO, Dry Weather, monthly total2 occur/mo≤ 0 occur/mo—
February 2026SSO, Wet Weather, monthly total10 occur/mo≤ 0 occur/mo—
March 2026SSO, Dry Weather, monthly total3 occur/mo≤ 0 occur/mo—
April 2026E. coli, daily maximum770 MPN/100mL≤ 487 MPN/100mL58%
April 2026SSO, Dry Weather, monthly total2 occur/mo≤ 0 occur/mo—
April 2026SSO, Wet Weather, monthly total1 occur/mo≤ 0 occur/mo—
May 2026E. coli, daily maximum579 MPN/100mL≤ 487 MPN/100mL19%
May 2026IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubia, minimum.5 %≥ 5.3 %91%
May 2026SSO, Wet Weather, monthly total4 occur/mo≤ 0 occur/mo—
June 2026SSO, Wet Weather, monthly total1 occur/mo≤ 0 occur/mo—
July 2026SSO, Dry Weather, monthly total2 occur/mo≤ 0 occur/mo—
July 2026SSO, Wet Weather, monthly total20 occur/mo≤ 0 occur/mo—
August 2026SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—
August 2026SSO, Wet Weather, monthly total2 occur/mo≤ 0 occur/mo—

Limits in force (152)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/Lall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 40 mg/Lall year001
Solids, total suspendeddaily maximum≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 25020 lb/dall year001
Solids, total suspendeddaily maximum≤ 37530 lb/dall year001
Solids, total suspendedweekly average≤ 33360 lb/dall year001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Solids, total suspendeddaily maximumreport only (mg/L)all year001
Solids, total suspendedweekly average≤ 40 mg/Lall year001
Solids, total suspendeddaily maximum≤ 45 mg/Lall year001
Solids, total suspendedweekly average≤ 73392 lb/dall year001
Solids, total suspendeddaily maximum≤ 82566 lb/dall year001
Solids, settleabledaily maximum≤ 1 mL/Lall year001
Nitrogen, total [as N]daily maximumreport only (lb/d)all year001
Nitrogen, ammonia total [as N]monthly average≤ 10 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/LMay–Oct001
Nitrogen, ammonia total [as N]weekly average≤ 15 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 7.5 mg/LMay–Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 20 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 10 mg/LMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 8340 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 4170 lb/dMay–Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 16680 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 8340 lb/dMay–Oct001
Nitrogen, ammonia total [as N]weekly average≤ 6225 lb/dMay–Oct001
Nitrogen, ammonia total [as N]weekly average≤ 12510 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 15 mg/Lall year001
Nitrogen, ammonia total [as N]daily maximum≤ 20 mg/Lall year001
Nitrogen, ammonia total [as N]weekly average≤ 27522 lb/dall year001
Nitrogen, ammonia total [as N]daily maximum≤ 36696 lb/dall year001
Phosphorus, total [as P]daily maximumreport only (lb/d)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualdaily maximum≤ .26 mg/Lall year001
E. colimonthly geometric mean≤ 126 MPN/100mLall year001
E. colidaily maximum≤ 487 MPN/100mLall year001
SSO, Dry Weathermonthly total≤ 0 occur/moall year001
SSO, Wet Weathermonthly total≤ 0 occur/moall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 20 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LMay–Oct001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/LMay–Oct001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 40 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 25 mg/LMay–Oct001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 16680 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 8340 lb/dMay–Oct001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 33360 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 20850 lb/dMay–Oct001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 25020 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 12510 lb/dMay–Oct001
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year001
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 35 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 40 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 64218 lb/dall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 73392 lb/dall year001
BOD, carbonaceous, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiaminimum≥ 5.3 %all year001
IC25 Static Renewal 7 Day Chronic Pimephalesminimum≥ 5.3 %all year001
Rainfall durationmonthly totalreport only (hr)all year019
Rainfallmonthly totalreport only (in)all year019
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year019
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year019
Rainfall eventsmonthly totalreport only (occur/mo)all year019
Discharge event observation [Visual Monitoring]monthly totalreport only (N=0;Y=1)all year019
Rainfall durationmonthly totalreport only (hr)all year01A
Oxygen, dissolved [DO]minimumreport only (mg/L)all year01A
pHdaily minimum≥ 6 SUall year01A
pHmaximum≤ 9 SUall year01A
Solids, total suspendedmonthly averagereport only (mg/L)all year01A
Solids, total suspendedweekly averagereport only (mg/L)all year01A
Solids, total suspendeddaily maximumreport only (mg/L)all year01A
Solids, total suspendedmonthly averagereport only (lb/d)all year01A
Solids, total suspendeddaily maximumreport only (lb/d)all year01A
Solids, total suspendedweekly averagereport only (lb/d)all year01A
Solids, total suspendeddaily maximumreport only (lb/d)all year01A
Solids, settleabledaily maximumreport only (mL/L)all year01A
Rainfallmonthly totalreport only (in)all year01A
Durationmonthly totalreport only (d/mo)all year01A
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year01A
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year01A
Chlorine, total residualdaily maximum≤ 2 mg/Lall year01A
E. colimonthly geometric mean≤ 126 MPN/100mLall year01A
E. colidaily maximum≤ 487 MPN/100mLall year01A
Rainfall eventsmonthly totalreport only (occur/mo)all year01A
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year01A
BOD, carbonaceous [5 day, 20 C]weekly averagereport only (mg/L)all year01A
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all year01A
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (lb/d)all year01A
BOD, carbonaceous [5 day, 20 C]weekly averagereport only (lb/d)all year01A
BOD, carbonaceous [5 day, 20 C]weekly averagereport only (lb/d)all year01A
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (lb/d)all year01A
Rainfall durationmonthly totalreport only (hr)all year023
Rainfallmonthly totalreport only (in)all year023
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year023
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year023
Rainfall eventsmonthly totalreport only (occur/mo)all year023
Discharge event observation [Visual Monitoring]monthly totalreport only (N=0;Y=1)all year023
Rainfall durationmonthly totalreport only (hr)all year024
Rainfallmonthly totalreport only (in)all year024
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year024
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year024
Rainfall eventsmonthly totalreport only (occur/mo)all year024
Discharge event observation [Visual Monitoring]monthly totalreport only (N=0;Y=1)all year024
Rainfall durationmonthly totalreport only (hr)all year033
Rainfallmonthly totalreport only (in)all year033
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year033
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year033
Rainfall eventsmonthly totalreport only (occur/mo)all year033
Discharge event observation [Visual Monitoring]monthly totalreport only (N=0;Y=1)all year033
Rainfall durationmonthly totalreport only (hr)all year035
Rainfallmonthly totalreport only (in)all year035
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year035
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year035
Rainfall eventsmonthly totalreport only (occur/mo)all year035
Discharge event observation [Visual Monitoring]monthly totalreport only (N=0;Y=1)all year035
Rainfall durationmonthly totalreport only (hr)all year047
Rainfallmonthly totalreport only (in)all year047
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year047
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year047
Rainfall eventsmonthly totalreport only (occur/mo)all year047
Discharge event observation [Visual Monitoring]monthly totalreport only (N=0;Y=1)all year047
Temperature, water deg. centigrademonthly averagereport only (deg C)all yearIMP1
Oxygen, dissolved [DO]monthly averagereport only (mg/L)all yearIMP1
pHmonthly averagereport only (SU)all yearIMP1
Nitrogen, total [as N]monthly averagereport only (mg/L)all yearIMP1
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all yearIMP1
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearIMP1
Chromium, total [as Cr]monthly averagereport only (mg/L)all yearIMP1
Copper, total [as Cu]monthly averagereport only (mg/L)all yearIMP1
Nickel, total [as Ni]monthly averagereport only (mg/L)all yearIMP1
Zinc, total [as Zn]monthly averagereport only (mg/L)all yearIMP1
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearIMP1
E. colimonthly averagereport only (MPN/100mL)all yearIMP1
Temperature, water deg. centigrademonthly averagereport only (deg C)all yearIMP2
Oxygen, dissolved [DO]monthly averagereport only (mg/L)all yearIMP2
pHmonthly averagereport only (SU)all yearIMP2
Nitrogen, total [as N]monthly averagereport only (mg/L)all yearIMP2
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all yearIMP2
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearIMP2
Chromium, total [as Cr]monthly averagereport only (mg/L)all yearIMP2
Copper, total [as Cu]monthly averagereport only (mg/L)all yearIMP2
Nickel, total [as Ni]monthly averagereport only (mg/L)all yearIMP2
Zinc, total [as Zn]monthly averagereport only (mg/L)all yearIMP2
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearIMP2
E. colimonthly averagereport only (MPN/100mL)all yearIMP2

How strict are these limits?

Cited limits by parameter: Tennessee'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/TN0020575 · MCP: https://passage-data.com/mcp