Tennessee Valley Authority (TVA)

NPDES permit TN0080918 · Major FEDERAL · effective, expires 2029-05-31 · 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)
0of 44 forms filed late

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

Reporting

Reports are due about 15 days after each monitoring period ends (the most common figure among TN permits in EPA's filings — check your permit).

Limits in force (37)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeMAXIMUM <= 30.5 deg C all year
001Oxygen, dissolved [DO]MO AV MN >= 5.5 mg/L all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedDAILY MX report only all year
001Nitrogen, ammonia total [as N]MO AVG <= .6 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 1.14 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 2.93 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 5.73 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Hardness, total [as CaCO3]MO AVG report only all year
001Hardness, total [as CaCO3]DAILY MX report only all year
001Chromium, hexavalent [as Cr]MO AVG <= .011 mg/L all year
001Chromium, hexavalent [as Cr]DAILY MX <= .016 mg/L all year
001Zinc, total [as Zn]MO AVG report only all year
001Zinc, total [as Zn]DAILY MX report only all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Chlorine, total residualMO AVG <= .011 mg/L all year
001Chlorine, total residualDAILY MX <= .019 mg/L all year
001Temperature rate of change deg. C/hrMAXIMUM <= 2 deg C/hr all year
001LC50 Static 48Hr Acute Ceriodaphnia dubiaMINIMUM > 100 % all year
001LC50 Static 48Hr Acute Pimephales promelasMINIMUM > 100 % all year
01AFlow, in conduit or thru treatment plantMO AVG report only all year
01AFlow, in conduit or thru treatment plantDAILY MX report only all year
01BChromium, total [as Cr]MO AVG <= .2 mg/L all year
01BChromium, total [as Cr]DAILY MX <= .2 mg/L all year
01BZinc, total [as Zn]MO AVG <= 1 mg/L all year
01BZinc, total [as Zn]DAILY MX <= 1 mg/L all year
01BFlow, in conduit or thru treatment plantMO AVG report only all year
01BFlow, in conduit or thru treatment plantDAILY MX report only all year
01CSolids, total suspendedMO AVG <= 30 mg/L all year
01CSolids, total suspendedDAILY MX <= 100 mg/L all year
01COil and greaseMO AVG <= 15 mg/L all year
01COil and greaseDAILY MX <= 20 mg/L all year
01CFlow, in conduit or thru treatment plantMO AVG report only all year
01CFlow, in conduit or thru treatment plantDAILY MX report only 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