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Hamilton County Water & Wastewater Treatment Authority (WWTA)

Sewage treatment plant, Signal Mountain, Tennessee. NPDES permit TN0021211, in force until Mar 31, 2029. Last 12 months: over a limit 29 times (last August 2026), 1 required value missing, 1 of 24 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form G monthly (29 values), outfall INF1 form G monthly (6 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
52 values over a limit, 1 required value missing, 1 of 24 reports late

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

All 29 values over a limit
Period endingParameterReportedLimitOver by
October 2025SSO, Dry Weather, monthly total270 occur/mo≤ 0 occur/mo—
October 2025SSO, Dry Weather, monthly total270 occur/mo≤ 0 occur/mo—
October 2025Solids, settleable, daily maximum1.5 mL/L≤ 1 mL/L50%
October 2025Solids, suspended percent removal, daily minimum-3.8 %≥ 40 %73%
November 2025Solids, total suspended, weekly average145.26 lb/d≤ 133 lb/d9%
January 2026SSO, Dry Weather, monthly total10800 occur/mo≤ 0 occur/mo—
January 2026SSO, Wet Weather, monthly total383803 occur/mo≤ 0 occur/mo—
February 2026SSO, Wet Weather, monthly total77668 occur/mo≤ 0 occur/mo—
March 2026BOD, 5-day, 20 deg. C, monthly average66.416 mg/L≤ 30 mg/L121%
March 2026SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—
March 2026Solids, suspended percent removal, daily minimum5.6 %≥ 40 %57%
March 2026Solids, suspended percent removal, monthly average minimum77 %≥ 85 %53%
March 2026Solids, total suspended, monthly average100.979 lb/d≤ 100 lb/d1%
March 2026Solids, total suspended, weekly average280.043 lb/d≤ 133 lb/d111%
April 2026SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—
May 2026SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—
May 2026SSO, Wet Weather, monthly total1 occur/mo≤ 0 occur/mo—
May 2026Solids, total suspended, weekly average143.854 lb/d≤ 133 lb/d8%
June 2026SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—
July 2026BOD, 5-day, 20 deg. C, daily maximum394.315 mg/L≤ 45 mg/L776%
July 2026BOD, 5-day, 20 deg. C, weekly average141.046 lb/d≤ 133 lb/d6%
July 2026BOD, 5-day, percent removal, daily minimum4 %≥ 40 %60%
July 2026Solids, suspended percent removal, daily minimum-123.8 %≥ 40 %273%
July 2026Solids, suspended percent removal, monthly average minimum79.5 %≥ 85 %37%
July 2026Solids, total suspended, daily maximum94 mg/L≤ 45 mg/L109%
July 2026Solids, total suspended, weekly average275.112 lb/d≤ 133 lb/d107%
August 2026BOD, 5-day, 20 deg. C, daily maximum53 mg/L≤ 45 mg/L18%
August 2026Solids, total suspended, daily maximum69 mg/L≤ 45 mg/L53%
August 2026Solids, total suspended, weekly average154.031 lb/d≤ 133 lb/d16%

Limits in force (35)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 1 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 40 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 100 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 133 lb/dall 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≤ 100 lb/dall year001
Solids, total suspendedweekly average≤ 133 lb/dall year001
Solids, settleabledaily maximum≤ 1 mL/Lall year001
Nitrogen, total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, total [as N]daily maximumreport only (lb/d)all year001
Phosphorus, total [as P]daily maximumreport only (mg/L)all 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
Chlorine, total residualdaily maximum≤ 2 mg/Lall year001
E. colimonthly geometric mean≤ 126 #/100mLall year001
E. colidaily maximum≤ 487 #/100mLall year001
SSO, Dry Weathermonthly total≤ 0 occur/moall year001
SSO, Wet Weathermonthly total≤ 0 occur/moall year001
BOD, 5-day, percent removaldaily minimum≥ 40 %all year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removaldaily minimum≥ 40 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all yearINF1
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all yearINF1
Solids, total suspendedmonthly averagereport only (mg/L)all yearINF1
Solids, total suspendeddaily maximumreport only (mg/L)all yearINF1
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearINF1
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearINF1

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/TN0021211 · MCP: https://passage-data.com/mcp