Tennessee Valley Authority (TVA)

NPDES permit TN0020168 · Major FEDERAL · effective, expires 2027-01-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

EPA's record, 2025-09-01 to 2026-08-31

0values over a limit
0required values missing, on 0 form(s)
6of 66 forms filed late

Last period with anything received: 2026-07-31.

Reporting

Reports are due about 15 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (76)

OutfallParameterStatisticLimitMonths
101Temperature, water deg. centigradeDAILY MX <= 35 deg C all year
101pHMINIMUM >= 6 SU all year
101pHMAXIMUM <= 9 SU all year
101Solids, total suspendedMO AVG <= 30 mg/L all year
101Solids, total suspendedDAILY MX <= 100 mg/L all year
101Oil and grease, hexane extr methodMO AVG <= 15 mg/L all year
101Oil and grease, hexane extr methodDAILY MX <= 20 mg/L all year
101Chromium, total [as Cr]DAILY MX <= .2 mg/L all year
101Zinc, total [as Zn]DAILY MX <= 1 mg/L all year
101Flow, in conduit or thru treatment plantMO AVG report only all year
101Flow, in conduit or thru treatment plantDAILY MX report only all year
101Chlorine, total residualDAILY MX <= .2 mg/L all year
101Discharge event observation [Visual Monitoring]TOTAL report only all year
101IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMINIMUM > 4 % all year
101IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasMINIMUM > 4 % all year
102Temperature, water deg. centigradeDAILY MX <= 35 deg C all year
102pHMINIMUM >= 6 SU all year
102pHMAXIMUM <= 9 SU all year
102Solids, total suspendedMO AVG <= 30 mg/L all year
102Solids, total suspendedDAILY MX <= 100 mg/L all year
102Oil and grease, hexane extr methodMO AVG <= 15 mg/L all year
102Oil and grease, hexane extr methodDAILY MX <= 20 mg/L all year
102Chromium, total [as Cr]DAILY MX <= .2 mg/L all year
102Zinc, total [as Zn]DAILY MX <= 1 mg/L all year
102Flow, in conduit or thru treatment plantMO AVG report only all year
102Flow, in conduit or thru treatment plantDAILY MX report only all year
102Chlorine, total residualDAILY MX <= .2 mg/L all year
102Discharge event observation [Visual Monitoring]TOTAL report only all year
102IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMINIMUM > 4 % all year
102IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasMINIMUM > 4 % all year
103pHMINIMUM >= 6 SU all year
103pHMAXIMUM <= 9 SU all year
103Solids, total suspendedMO AVG <= 30 mg/L all year
103Solids, total suspendedDAILY MX <= 100 mg/L all year
103Oil and grease, hexane extr methodMO AVG <= 15 mg/L all year
103Oil and grease, hexane extr methodDAILY MX <= 20 mg/L all year
103Flow, in conduit or thru treatment plantMO AVG report only all year
103Flow, in conduit or thru treatment plantDAILY MX report only all year
107pHMINIMUM report only all year
107pHMAXIMUM report only all year
107Solids, total suspendedMO AVG <= 30 mg/L all year
107Solids, total suspendedDAILY MX <= 100 mg/L all year
107Oil and grease, hexane extr methodMO AVG <= 15 mg/L all year
107Oil and grease, hexane extr methodDAILY MX <= 20 mg/L all year
107Phosphorus, total [as P]MO AVG <= 1 mg/L all year
107Phosphorus, total [as P]DAILY MX <= 1 mg/L all year
107Copper, total [as Cu]MO AVG <= 1 mg/L all year
107Copper, total [as Cu]DAILY MX <= 1 mg/L all year
107Iron, total [as Fe]MO AVG <= 1 mg/L all year
107Iron, total [as Fe]DAILY MX <= 1 mg/L all year
107Flow, in conduit or thru treatment plantMO AVG report only all year
107Flow, in conduit or thru treatment plantDAILY MX report only all year
113Temperature, water deg. centigradeDAILY MX report only all year
113Temperature, water deg. centigradeDAILY MX <= 33.5 deg C all year
113Temperature, water deg. centigradeDAILY MX <= 30.5 deg C all year
113Temp. diff. between samp. & upstrm deg. CDAILY MX <= 3 deg C all year
113pHMINIMUM >= 6 SU all year
113pHMAXIMUM <= 9 SU all year
113Solids, total suspendedMO AVG <= 30 mg/L all year
113Solids, total suspendedDAILY MX <= 100 mg/L all year
113Oil and grease, hexane extr methodMO AVG <= 15 mg/L all year
113Oil and grease, hexane extr methodDAILY MX <= 20 mg/L all year
113Chromium, total [as Cr]DAILY MX <= .2 mg/L all year
113Zinc, total [as Zn]DAILY MX <= 1 mg/L all year
113Flow, in conduit or thru treatment plantMO AVG report only all year
113Flow, in conduit or thru treatment plantDAILY MX report only all year
113Chlorine, total residualMO AVG report only all year
113Chlorine, total residualDAILY MX report only all year
113Temperature rate of change deg. C/hrDAILY MX <= 2 deg C/hr all year
113Discharge event observation [Visual Monitoring]TOTAL report only all year
113IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiaMINIMUM > 12.7 % all year
113IC25 Static Renewal 7 Day Chronic ChrpimephalesMINIMUM > 12.7 % all year
V001Flow, in conduit or thru treatment plantMO AVG report only all year
V001Flow, in conduit or thru treatment plantDAILY MX report only all year
V001Chlorine, total residualMO AVG <= .07 mg/L all year
V001Chlorine, total residualDAILY MX <= .12 mg/L all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states