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Tennessee Valley Authority (TVA)

Federal facility (Electric Services), major discharger, Soddy Daisy, Tennessee. NPDES permit TN0026450 expired Jul 31, 2025; its limits still apply. Last 12 months: no values over a limit, 5 of 60 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 101 form G monthly (11 values), outfall 103 form G monthly (8 values), outfall 107 form G monthly (10 values), outfall 110 form G monthly (11 values), outfall 118 form G monthly (5 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 16 required values missing, 15 of 60 reports late

Limits in force (47)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigradedaily maximumreport only (deg C)all year101
Temperature, water deg. centigradedaily maximum≤ 30.5 deg Call year101
Temp. diff. between samp. & upstrm deg. Cdaily maximum≤ 3 deg CApr–Oct101
Temp. diff. between samp. & upstrm deg. Cdaily maximum≤ 5 deg CJan, Feb, Mar, Nov, Dec101
Polychlorinated biphenyls [PCBs]daily maximum≤ 0 ppmall year101
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year101
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year101
Chlorine, total residualmonthly average≤ .027 mg/Lall year101
Chlorine, total residualdaily maximum≤ .047 mg/Lall year101
Temperature rate of change deg. C/hrdaily maximum≤ 2 deg C/hrall year101
IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaminimum> 69 %all year101
IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasminimum> 69 %all year101
pHminimum≥ 6 SUall year103
pHmaximum≤ 9 SUall year103
Solids, total suspendedmonthly average≤ 30 mg/Lall year103
Solids, total suspendeddaily maximum≤ 100 mg/Lall year103
Oil and grease, hexane extr methodmonthly average≤ 15 mg/Lall year103
Oil and grease, hexane extr methoddaily maximum≤ 20 mg/Lall year103
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year103
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year103
pHminimum≥ 6 SUall year107
pHmaximum≤ 9 SUall year107
Solids, total suspendedmonthly average≤ 30 mg/Lall year107
Solids, total suspendeddaily maximum≤ 100 mg/Lall year107
Oil and grease, hexane extr methodmonthly average≤ 15 mg/Lall year107
Oil and grease, hexane extr methoddaily maximum≤ 20 mg/Lall year107
Copper, total [as Cu]monthly average≤ 1 mg/Lall year107
Copper, total [as Cu]daily maximum≤ 1 mg/Lall year107
Iron, total [as Fe]monthly average≤ 1 mg/Lall year107
Iron, total [as Fe]daily maximum≤ 1 mg/Lall year107
Temperature, water deg. centigradedaily maximumreport only (deg C)all year110
Temperature, water deg. centigradedaily maximum≤ 30.5 deg Call year110
Temp. diff. between samp. & upstrm deg. Cdaily maximum≤ 5 deg CJan, Feb, Mar, Nov, Dec110
Temp. diff. between samp. & upstrm deg. Cdaily maximum≤ 3 deg CApr–Oct110
Polychlorinated biphenyls [PCBs]daily maximum≤ 0 ppmall year110
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year110
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year110
Chlorine, total residualmonthly average≤ .027 mg/Lall year110
Chlorine, total residualdaily maximum≤ .047 mg/Lall year110
Temperature rate of change deg. C/hrdaily maximum≤ 2 deg C/hrall year110
IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaminimum> 69 %all year110
IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasminimum> 69 %all year110
Oxygen, dissolved [DO]minimum≥ 2 mg/Lall year118
Solids, total suspendeddaily maximum≤ 100 mg/Lall year118
Solids, settleabledaily maximum≤ 1 mL/Lall year118
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year118
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year118

How strict are these limits?

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

Same industry: the 15 Electric Services permits in Tennessee.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/TN0026450 · MCP: https://passage-data.com/mcp