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Metro Water Services

Sewage treatment plant, major discharger, Nashville, Tennessee. NPDES permit TN0024970 expired Oct 31, 2025; its limits still apply. Last 12 months: over a limit 14 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form G monthly (40 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
15 values over a limit, 0 required values missing, 0 of 12 reports late

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

All 14 values over a limit
Period endingParameterReportedLimitOver by
November 2025SSO, Wet Weather, monthly total1 occur/mo≤ 0 occur/mo—
December 2025SSO, Wet Weather, monthly total2 occur/mo≤ 0 occur/mo—
December 2025Solids, suspended percent removal, daily minimum37.5 %≥ 40 %4%
January 2026SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—
January 2026SSO, Wet Weather, monthly total5 occur/mo≤ 0 occur/mo—
February 2026SSO, Dry Weather, monthly total2 occur/mo≤ 0 occur/mo—
March 2026SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—
April 2026SSO, Dry Weather, monthly total2 occur/mo≤ 0 occur/mo—
April 2026SSO, Wet Weather, monthly total1 occur/mo≤ 0 occur/mo—
May 2026SSO, Wet Weather, monthly total7 occur/mo≤ 0 occur/mo—
June 2026SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—
June 2026SSO, Wet Weather, monthly total1 occur/mo≤ 0 occur/mo—
July 2026SSO, Wet Weather, monthly total5 occur/mo≤ 0 occur/mo—
September 2026SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—

Limits in force (52)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/Lall year
pHdaily minimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 40 mg/Lall year
Solids, total suspendeddaily maximum≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 9383 lb/dall year
Solids, total suspendedweekly average≤ 12510 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]daily maximumreport only (lb/d)Mar, Jun, Sep, Dec
Nitrogen, total [as N]daily maximumreport only (lb/d)all year
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 10 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 7.5 mg/LMay–Oct
Nitrogen, ammonia total [as N]weekly average≤ 15 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 10 mg/LMay–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 20 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 1565 lb/dMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 3128 lb/dJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 2346 lb/dMay–Oct
Nitrogen, ammonia total [as N]weekly average≤ 4691 lb/dJan, Feb, Mar, Apr, Nov, Dec
Phosphorus, total [as P]daily maximumreport only (lb/d)Mar, Jun, Sep, Dec
Phosphorus, total [as P]daily maximumreport only (lb/d)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 residualdaily maximum≤ .9 mg/Lall year
E. colimonthly geometric mean≤ 126 MPN/100mLall year
E. colidaily maximum≤ 487 MPN/100mLall year
SSO, Dry Weathermonthly total≤ 0 occur/moall year
SSO, Wet Weathermonthly total≤ 0 occur/moall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 15 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 23 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 20 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 3128 lb/dMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 4691 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]weekly average≤ 4691 lb/dMay–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 7193 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all year
BOD, carbonaceous, percent removaldaily minimum≥ 40 %all year
BOD, carbonaceous, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removaldaily minimum≥ 40 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiaminimum≥ 2 %all year
IC25 Static Renewal 7 Day Chronic Pimephalesminimum≥ 2 %all year

How strict are these limits?

Cited limits by parameter: Tennessee'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/TN0024970 · MCP: https://passage-data.com/mcp