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Tennessee Technological University

Sewage treatment plant, Smithville, Tennessee. NPDES permit TN0055409, in force until Jun 30, 2027. Last 12 months: over a limit 2 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due: About 15 days after each period: form G monthly (12 values)
Renewal application due: Jan 1, 2027 · 180 days before expiry; your permit may set another date
Last report on file: September 2026
Oct 2024 – Sep 2025: 3 values over a limit, 0 required values missing, 0 of 12 reports late

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

Period ending	Parameter	Reported	Limit
November 2025	pH, instantaneous minimum	6.42 SU	≥ 6.5 SU
September 2026	pH, instantaneous minimum	6.11 SU	≥ 6.5 SU

Limits in force (12)

Parameter	Statistic	Limit	Months
Oxygen, dissolved [DO]	instantaneous minimum	≥ 1 mg/L	all year
BOD, 5-day, 20 deg. C	monthly average	≤ 30 mg/L	all year
BOD, 5-day, 20 deg. C	daily maximum	≤ 45 mg/L	all year
pH	instantaneous minimum	≥ 6.5 SU	all year
pH	instantaneous maximum	≤ 9 SU	all year
Solids, total suspended	monthly average	≤ 30 mg/L	all year
Solids, total suspended	daily maximum	≤ 45 mg/L	all year
Solids, settleable	daily maximum	≤ 1 mL/L	all year
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year
E. coli	monthly average	≤ 126 #/100mL	all year
E. coli	daily maximum	≤ 487 #/100mL	all year

How strict are these limits?

pH, instantaneous minimum at least 6.5 SU — stricter than 85% of 1,111 other minor POTWs nationwide; 14% have the same limit
E. coli, daily maximum 487 #/100mL — stricter than 34% of 198 other minor POTWs in Tennessee; 17% have the same limit
BOD, 5-day, 20 deg. C, monthly average 30 mg/L — stricter than 34% of 91 other minor POTWs in Tennessee; 54% have the same limit

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/TN0055409 · MCP: https://passage-data.com/mcp