Tennessee Valley Authority (TVA) — NPDES permit TN0005436: limits, due date and EPA's record

NPDES permit TN0005436 · Major FEDERAL · effective, expires 2029-12-31 · EPA's file as of 2026-09-19

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

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 (61)

Outfall	Parameter	Statistic	Limit	Months
003	Temperature, water deg. centigrade	DAILY MX	<= 30.5 deg C (alert)	all year
003	Temperature, water deg. centigrade	DAILY MX	<= 30.5 deg C	all year
003	Temp. diff. between samp. & upstrm deg. C	DAILY MX	<= 3 deg C	all year
003	pH	DAILY MN	>= 6 SU	all year
003	pH	MAXIMUM	<= 9 SU	all year
003	Solids, total suspended	MO AVG	report only	all year
003	Solids, total suspended	DAILY MX	report only	all year
003	Solids, total suspended	MO AVG	<= 105 lb/d	all year
003	Solids, total suspended	DAILY MX	<= 350 lb/d	all year
003	Phosphorus, total [as P]	MO AVG	report only	all year
003	Phosphorus, total [as P]	DAILY MX	report only	all year
003	Chromium, total [as Cr]	MO AVG	<= 1.17 lb/d	all year
003	Chromium, total [as Cr]	DAILY MX	<= 1.17 lb/d	all year
003	Zinc, total [as Zn]	MO AVG	<= 5.85 lb/d	all year
003	Zinc, total [as Zn]	DAILY MX	<= 5.85 lb/d	all year
003	Oil and grease	MO AVG	report only	all year
003	Oil and grease	DAILY MX	report only	all year
003	Oil and grease	MO AVG	<= 52.5 lb/d	all year
003	Oil and grease	DAILY MX	<= 70.1 lb/d	all year
003	Oxidants, total residual	MO AVG	report only	all year
003	Oxidants, total residual	DAILY MX	report only	all year
003	Oxidants, total residual	MO AVG	<= 1.2 lb/d	all year
003	Oxidants, total residual	DAILY MX	<= 2.9 lb/d	all year
003	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
003	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
003	Temperature rate of change deg. C/hr	DAILY MX	<= 2 deg C/hr	all year
003	LC50 Static 48Hr Acute Ceriodaphnia dubia	VALUE	report only	all year
003	LC50 Static 48Hr Acute Pimephales promelas	VALUE	report only	all year
008	pH	DAILY MN	>= 6 SU	all year
008	pH	DAILY MX	<= 9 SU	all year
008	Solids, total suspended	MO AVG	<= 30 mg/L	all year
008	Solids, total suspended	DAILY MX	<= 100 mg/L	all year
008	Nitrogen, ammonia total [as N]	DAILY MX	report only	all year
008	Nitrite + Nitrate total [as N]	DAILY MX	report only	all year
008	Cyanide, total [as CN]	DAILY MX	report only	all year
008	Hardness, total [as CaCO3]	DAILY MX	report only	all year
008	Arsenic, total [as As]	DAILY MX	report only	all year
008	Barium, total [as Ba]	DAILY MX	report only	all year
008	Beryllium, total [as Be]	DAILY MX	report only	all year
008	Cadmium, total [as Cd]	DAILY MX	report only	all year
008	Chromium, hexavalent [as Cr]	DAILY MX	report only	all year
008	Chromium, trivalent [as Cr]	DAILY MX	report only	all year
008	Chromium, total [as Cr]	DAILY MX	report only	all year
008	Copper, total [as Cu]	DAILY MX	report only	all year
008	Iron, total [as Fe]	DAILY MX	report only	all year
008	Lead, total [as Pb]	DAILY MX	report only	all year
008	Manganese, total [as Mn]	DAILY MX	report only	all year
008	Thallium, total [as Tl]	DAILY MX	report only	all year
008	Nickel, total [as Ni]	DAILY MX	report only	all year
008	Silver, total [as Ag]	DAILY MX	report only	all year
008	Zinc, total [as Zn]	DAILY MX	report only	all year
008	Antimony, total [as Sb]	DAILY MX	report only	all year
008	Aluminum, total [as Al]	DAILY MX	report only	all year
008	Selenium, total [as Se]	DAILY MX	report only	all year
008	Oil and grease	MO AVG	<= 15 mg/L	all year
008	Oil and grease	DAILY MX	<= 20 mg/L	all year
008	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
008	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
008	Solids, total dissolved	DAILY MX	report only	all year
008	Mercury, total [as Hg]	DAILY MX	report only	all year
008	Methylmercury	DAILY MX	report only	all year