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Four Rivers Nuclear Partnership LLC - Paducah Gaseous Diffusion Plant

Federal facility (Industrial Inorganic Chemicals), major discharger, Kevil, Kentucky. NPDES permit KY0004049, in force until Jan 31, 2028. Last 12 months: over a limit 3 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form 1 monthly (23 values), outfall 001 form 2 quarterly (3 values), outfall 002 form 1 monthly (25 values), outfall 004 form 1 monthly (6 values), outfall 006 form 1 monthly (12 values), outfall 008 form 1 monthly (27 values), and 13 more forms
Renewal application due
Aug 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 196 reports late

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

Period endingOutfallParameterReportedLimitOver by
November 2025004Solids, total suspended, daily maximum61 mg/L≤ 60 mg/L2%
May 2026013Solids, total suspended, monthly average35 mg/L≤ 30 mg/L17%
July 2026013Solids, total suspended, monthly average34 mg/L≤ 30 mg/L13%

Limits in force (315)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitmaximum≤ 89 deg Fall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendeddaily maximum≤ 60 mg/Lall year001
Oil & Greasemonthly average≤ 10 mg/Lall year001
Oil & Greasedaily maximum≤ 15 mg/Lall year001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Alpha, totalmonthly averagereport only (pCi/L)all year001
Alpha, totaldaily maximumreport only (pCi/L)all year001
Beta, totalmonthly averagereport only (pCi/L)all year001
Beta, totaldaily maximumreport only (pCi/L)all year001
Toxicitymaximum≤ 1 tox chronicall year001
Technetium 99, total [14]monthly averagereport only (pCi/L)all year001
Technetium 99, total [14]daily maximumreport only (pCi/L)all year001
Uranium, totalmonthly averagereport only (ug/L)all year001
Uranium, totaldaily maximumreport only (ug/L)all year001
Trichloroethylenemonthly averagereport only (mg/L)all year001
Trichloroethylenedaily maximumreport only (mg/L)all year001
Polychlorinated biphenyls [PCBs]monthly averagereport only (ug/L)all year001
Polychlorinated biphenyls [PCBs]daily maximumreport only (ug/L)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualmonthly average≤ .011 mg/Lall year001
Chlorine, total residualdaily maximum≤ .019 mg/Lall year001
Temperature, water deg. fahrenheitmaximum≤ 89 deg Fall year002
pHminimum≥ 6 SUall year002
pHmaximum≤ 9 SUall year002
Solids, total suspendedmonthly average≤ 30 mg/Lall year002
Solids, total suspendeddaily maximum≤ 60 mg/Lall year002
Oil & Greasemonthly average≤ 10 mg/Lall year002
Oil & Greasedaily maximum≤ 15 mg/Lall year002
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year002
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year002
Copper, total recoverablemonthly averagereport only (ug/L)all year002
Copper, total recoverabledaily maximumreport only (ug/L)all year002
Alpha, totalmonthly averagereport only (pCi/L)all year002
Alpha, totaldaily maximumreport only (pCi/L)all year002
Beta, totalmonthly averagereport only (pCi/L)all year002
Beta, totaldaily maximumreport only (pCi/L)all year002
Technetium 99, total [14]monthly averagereport only (pCi/L)all year002
Technetium 99, total [14]daily maximumreport only (pCi/L)all year002
Uranium, totalmonthly averagereport only (ug/L)all year002
Uranium, totaldaily maximumreport only (ug/L)all year002
Trichloroethylenemonthly averagereport only (mg/L)all year002
Trichloroethylenedaily maximumreport only (mg/L)all year002
Polychlorinated biphenyls [PCBs]monthly averagereport only (ug/L)all year002
Polychlorinated biphenyls [PCBs]daily maximumreport only (ug/L)all year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year004
BOD, 5-day, 20 deg. Cdaily maximum≤ 60 mg/Lall year004
Solids, total suspendedmonthly average≤ 30 mg/Lall year004
Solids, total suspendeddaily maximum≤ 60 mg/Lall year004
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year004
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year004
pHminimum≥ 6 SUall year006
pHmaximum≤ 9 SUall year006
Solids, total suspendedmonthly average≤ 30 mg/Lall year006
Solids, total suspendeddaily maximum≤ 60 mg/Lall year006
Oil & Greasemonthly average≤ 10 mg/Lall year006
Oil & Greasedaily maximum≤ 15 mg/Lall year006
Phosphorus, total [as P]monthly averagereport only (mg/L)all year006
Phosphorus, total [as P]daily maximumreport only (mg/L)all year006
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year006
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year006
Chlorine, total residualmonthly average≤ 11 ug/Lall year006
Chlorine, total residualdaily maximum≤ 19 ug/Lall year006
Temperature, water deg. fahrenheitmaximum≤ 89 deg Fall year008
pHminimum≥ 6 SUall year008
pHmaximum≤ 9 SUall year008
Solids, total suspendedmonthly average≤ 30 mg/Lall year008
Solids, total suspendeddaily maximum≤ 60 mg/Lall year008
Oil & Greasemonthly average≤ 10 mg/Lall year008
Oil & Greasedaily maximum≤ 15 mg/Lall year008
Phosphorus, total [as P]monthly averagereport only (mg/L)all year008
Phosphorus, total [as P]daily maximumreport only (mg/L)all year008
Alpha, totalmonthly averagereport only (pCi/L)all year008
Alpha, totaldaily maximumreport only (pCi/L)all year008
Beta, totalmonthly averagereport only (pCi/L)all year008
Beta, totaldaily maximumreport only (pCi/L)all year008
Technetium 99, total [14]monthly averagereport only (pCi/L)all year008
Technetium 99, total [14]daily maximumreport only (pCi/L)all year008
Uranium, totalmonthly averagereport only (ug/L)all year008
Uranium, totaldaily maximumreport only (ug/L)all year008
Trichloroethylenemonthly averagereport only (mg/L)all year008
Trichloroethylenedaily maximumreport only (mg/L)all year008
Polychlorinated biphenyls [PCBs]monthly averagereport only (ug/L)all year008
Polychlorinated biphenyls [PCBs]daily maximumreport only (ug/L)all year008
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year008
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year008
Chlorine, total residualmonthly averagereport only (ug/L)all year008
Chlorine, total residualdaily maximumreport only (ug/L)all year008
Mercury, total recoverablemonthly average≤ .051 ug/Lall year008
Mercury, total recoverabledaily maximum≤ 1.4 ug/Lall year008
pHminimum≥ 6 SUall year009
pHmaximum≤ 9 SUall year009
Solids, total suspendedmonthly average≤ 30 mg/Lall year009
Solids, total suspendeddaily maximum≤ 60 mg/Lall year009
Oil & Greasemonthly average≤ 10 mg/Lall year009
Oil & Greasedaily maximum≤ 15 mg/Lall year009
Phosphorus, total [as P]monthly averagereport only (mg/L)all year009
Phosphorus, total [as P]daily maximumreport only (mg/L)all year009
Alpha, totalmonthly averagereport only (pCi/L)all year009
Alpha, totaldaily maximumreport only (pCi/L)all year009
Beta, totalmonthly averagereport only (pCi/L)all year009
Beta, totaldaily maximumreport only (pCi/L)all year009
Technetium 99, total [14]monthly averagereport only (pCi/L)all year009
Technetium 99, total [14]daily maximumreport only (pCi/L)all year009
Uranium, totalmonthly averagereport only (ug/L)all year009
Uranium, totaldaily maximumreport only (ug/L)all year009
Trichloroethylenemonthly averagereport only (mg/L)all year009
Trichloroethylenedaily maximumreport only (mg/L)all year009
Polychlorinated biphenyls [PCBs]monthly averagereport only (ug/L)all year009
Polychlorinated biphenyls [PCBs]daily maximumreport only (ug/L)all year009
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year009
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year009
pHminimum≥ 6 SUall year010
pHmaximum≤ 9 SUall year010
Solids, total suspendedmonthly average≤ 30 mg/Lall year010
Solids, total suspendeddaily maximum≤ 60 mg/Lall year010
Oil & Greasemonthly average≤ 10 mg/Lall year010
Oil & Greasedaily maximum≤ 15 mg/Lall year010
Alpha, totalmonthly averagereport only (pCi/L)all year010
Alpha, totaldaily maximumreport only (pCi/L)all year010
Beta, totalmonthly averagereport only (pCi/L)all year010
Beta, totaldaily maximumreport only (pCi/L)all year010
Toxicitymaximum≤ 1 tox chronicall year010
Technetium 99, total [14]monthly averagereport only (pCi/L)all year010
Technetium 99, total [14]daily maximumreport only (pCi/L)all year010
Uranium, totalmonthly averagereport only (ug/L)all year010
Uranium, totaldaily maximumreport only (ug/L)all year010
Trichloroethylenemonthly averagereport only (mg/L)all year010
Trichloroethylenedaily maximumreport only (mg/L)all year010
Polychlorinated biphenyls [PCBs]monthly averagereport only (ug/L)all year010
Polychlorinated biphenyls [PCBs]daily maximumreport only (ug/L)all year010
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year010
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year010
pHminimum≥ 6 SUall year011
pHmaximum≤ 9 SUall year011
Solids, total suspendedmonthly average≤ 30 mg/Lall year011
Solids, total suspendeddaily maximum≤ 60 mg/Lall year011
Oil & Greasemonthly average≤ 10 mg/Lall year011
Oil & Greasedaily maximum≤ 15 mg/Lall year011
Alpha, totalmonthly averagereport only (pCi/L)all year011
Alpha, totaldaily maximumreport only (pCi/L)all year011
Beta, totalmonthly averagereport only (pCi/L)all year011
Beta, totaldaily maximumreport only (pCi/L)all year011
Toxicitymaximum≤ 1 tox chronicall year011
Technetium 99, total [14]monthly averagereport only (pCi/L)all year011
Technetium 99, total [14]daily maximumreport only (pCi/L)all year011
Uranium, totalmonthly averagereport only (ug/L)all year011
Uranium, totaldaily maximumreport only (ug/L)all year011
Trichloroethylenemonthly averagereport only (mg/L)all year011
Trichloroethylenedaily maximumreport only (mg/L)all year011
Polychlorinated biphenyls [PCBs]monthly averagereport only (ug/L)all year011
Polychlorinated biphenyls [PCBs]daily maximumreport only (ug/L)all year011
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year011
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year011
pHminimum≥ 6 SUall year012
pHmaximum≤ 9 SUall year012
Solids, total suspendedmonthly average≤ 30 mg/Lall year012
Solids, total suspendeddaily maximum≤ 60 mg/Lall year012
Oil & Greasemonthly average≤ 10 mg/Lall year012
Oil & Greasedaily maximum≤ 15 mg/Lall year012
Alpha, totalmonthly averagereport only (pCi/L)all year012
Alpha, totaldaily maximumreport only (pCi/L)all year012
Beta, totalmonthly averagereport only (pCi/L)all year012
Beta, totaldaily maximumreport only (pCi/L)all year012
Technetium 99, total [14]monthly averagereport only (pCi/L)all year012
Technetium 99, total [14]daily maximumreport only (pCi/L)all year012
Uranium, totalmonthly averagereport only (ug/L)all year012
Uranium, totaldaily maximumreport only (ug/L)all year012
Trichloroethylenemonthly averagereport only (mg/L)all year012
Trichloroethylenedaily maximumreport only (mg/L)all year012
Polychlorinated biphenyls [PCBs]monthly averagereport only (ug/L)all year012
Polychlorinated biphenyls [PCBs]daily maximumreport only (ug/L)all year012
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year012
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year012
pHminimum≥ 6 SUall year013
pHmaximum≤ 9 SUall year013
Solids, total suspendedmonthly average≤ 30 mg/Lall year013
Solids, total suspendeddaily maximum≤ 60 mg/Lall year013
Oil & Greasemonthly average≤ 10 mg/Lall year013
Oil & Greasedaily maximum≤ 15 mg/Lall year013
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year013
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year013
Zinc, total recoverablemonthly averagereport only (ug/L)all year013
Zinc, total recoverabledaily maximum≤ 119 ug/Lall year013
Alpha, totalmonthly averagereport only (pCi/L)all year013
Alpha, totaldaily maximumreport only (pCi/L)all year013
Beta, totalmonthly averagereport only (pCi/L)all year013
Beta, totaldaily maximumreport only (pCi/L)all year013
Technetium 99, total [14]monthly averagereport only (pCi/L)all year013
Technetium 99, total [14]daily maximumreport only (pCi/L)all year013
Uranium, totalmonthly averagereport only (ug/L)all year013
Uranium, totaldaily maximumreport only (ug/L)all year013
Trichloroethylenemonthly averagereport only (mg/L)all year013
Trichloroethylenedaily maximumreport only (mg/L)all year013
Polychlorinated biphenyls [PCBs]monthly averagereport only (ug/L)all year013
Polychlorinated biphenyls [PCBs]daily maximumreport only (ug/L)all year013
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year013
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year013
pHminimum≥ 6 SUall year015
pHmaximum≤ 9 SUall year015
Solids, total suspendedmonthly average≤ 30 mg/Lall year015
Solids, total suspendeddaily maximum≤ 60 mg/Lall year015
Oil & Greasemonthly average≤ 10 mg/Lall year015
Oil & Greasedaily maximum≤ 15 mg/Lall year015
Phosphorus, total [as P]monthly averagereport only (mg/L)all year015
Phosphorus, total [as P]daily maximumreport only (mg/L)all year015
Alpha, totalmonthly averagereport only (pCi/L)all year015
Alpha, totaldaily maximumreport only (pCi/L)all year015
Beta, totalmonthly averagereport only (pCi/L)all year015
Beta, totaldaily maximumreport only (pCi/L)all year015
Technetium 99, total [14]monthly averagereport only (pCi/L)all year015
Technetium 99, total [14]daily maximumreport only (pCi/L)all year015
Uranium, totalmonthly averagereport only (ug/L)all year015
Uranium, totaldaily maximumreport only (ug/L)all year015
Trichloroethylenemonthly averagereport only (mg/L)all year015
Trichloroethylenedaily maximumreport only (mg/L)all year015
Polychlorinated biphenyls [PCBs]monthly averagereport only (ug/L)all year015
Polychlorinated biphenyls [PCBs]daily maximumreport only (ug/L)all year015
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year015
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year015
pHminimum≥ 6 SUall year016
pHmaximum≤ 9 SUall year016
Solids, total suspendedmonthly average≤ 30 mg/Lall year016
Solids, total suspendeddaily maximum≤ 60 mg/Lall year016
Oil & Greasemonthly average≤ 10 mg/Lall year016
Oil & Greasedaily maximum≤ 15 mg/Lall year016
Phosphorus, total [as P]monthly averagereport only (mg/L)all year016
Phosphorus, total [as P]daily maximumreport only (mg/L)all year016
Alpha, totalmonthly averagereport only (pCi/L)all year016
Alpha, totaldaily maximumreport only (pCi/L)all year016
Beta, totalmonthly averagereport only (pCi/L)all year016
Beta, totaldaily maximumreport only (pCi/L)all year016
Technetium 99, total [14]monthly averagereport only (pCi/L)all year016
Technetium 99, total [14]daily maximumreport only (pCi/L)all year016
Uranium, totalmonthly averagereport only (ug/L)all year016
Uranium, totaldaily maximumreport only (ug/L)all year016
Trichloroethylenemonthly averagereport only (mg/L)all year016
Trichloroethylenedaily maximumreport only (mg/L)all year016
Polychlorinated biphenyls [PCBs]monthly averagereport only (ug/L)all year016
Polychlorinated biphenyls [PCBs]daily maximumreport only (ug/L)all year016
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year016
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year016
pHminimum≥ 6 SUall year017
pHmaximum≤ 9 SUall year017
Solids, total suspendedmonthly average≤ 30 mg/Lall year017
Solids, total suspendeddaily maximum≤ 60 mg/Lall year017
Oil & Greasemonthly average≤ 10 mg/Lall year017
Oil & Greasedaily maximum≤ 15 mg/Lall year017
Phosphorus, total [as P]monthly averagereport only (mg/L)all year017
Phosphorus, total [as P]daily maximumreport only (mg/L)all year017
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year017
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year017
Zinc, total recoverablemonthly averagereport only (ug/L)all year017
Zinc, total recoverabledaily maximumreport only (ug/L)all year017
Alpha, totalmonthly averagereport only (pCi/L)all year017
Alpha, totaldaily maximumreport only (pCi/L)all year017
Beta, totalmonthly averagereport only (pCi/L)all year017
Beta, totaldaily maximumreport only (pCi/L)all year017
Toxicitymaximum≤ 1 tox acuteall year017
Technetium 99, total [14]monthly averagereport only (pCi/L)all year017
Technetium 99, total [14]daily maximumreport only (pCi/L)all year017
Uranium, totalmonthly averagereport only (ug/L)all year017
Uranium, totaldaily maximumreport only (ug/L)all year017
Trichloroethylenemonthly averagereport only (mg/L)all year017
Trichloroethylenedaily maximumreport only (mg/L)all year017
Polychlorinated biphenyls [PCBs]monthly averagereport only (ug/L)all year017
Polychlorinated biphenyls [PCBs]daily maximumreport only (ug/L)all year017
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year017
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year017
pHminimum≥ 6 SUall year019
pHmaximum≤ 9 SUall year019
Solids, total suspendedmonthly average≤ 30 mg/Lall year019
Solids, total suspendeddaily maximum≤ 60 mg/Lall year019
Oil & Greasemonthly average≤ 10 mg/Lall year019
Oil & Greasedaily maximum≤ 15 mg/Lall year019
Alpha, totalmonthly averagereport only (pCi/L)all year019
Alpha, totaldaily maximumreport only (pCi/L)all year019
Beta, totalmonthly averagereport only (pCi/L)all year019
Beta, totaldaily maximumreport only (pCi/L)all year019
Technetium 99, total [14]monthly averagereport only (pCi/L)all year019
Technetium 99, total [14]daily maximumreport only (pCi/L)all year019
Uranium, totalmonthly averagereport only (ug/L)all year019
Uranium, totaldaily maximumreport only (ug/L)all year019
Trichloroethylenemonthly averagereport only (ug/L)all year019
Trichloroethylenedaily maximumreport only (ug/L)all year019
Polychlorinated biphenyls [PCBs]monthly averagereport only (ug/L)all year019
Polychlorinated biphenyls [PCBs]daily maximumreport only (ug/L)all year019
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year019
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year019
pHminimum≥ 6 SUall year020
pHmaximum≤ 9 SUall year020
Solids, total suspendedmonthly average≤ 30 mg/Lall year020
Solids, total suspendeddaily maximum≤ 60 mg/Lall year020
Oil & Greasemonthly average≤ 10 mg/Lall year020
Oil & Greasedaily maximum≤ 15 mg/Lall year020
Alpha, totalmonthly averagereport only (pCi/L)all year020
Alpha, totaldaily maximumreport only (pCi/L)all year020
Beta, totalmonthly averagereport only (pCi/L)all year020
Beta, totaldaily maximumreport only (pCi/L)all year020
Technetium 99, total [14]monthly averagereport only (pCi/L)all year020
Technetium 99, total [14]daily maximumreport only (pCi/L)all year020
Uranium, totalmonthly averagereport only (ug/L)all year020
Uranium, totaldaily maximumreport only (ug/L)all year020
Trichloroethylenemonthly averagereport only (ug/L)all year020
Trichloroethylenedaily maximumreport only (ug/L)all year020
Polychlorinated biphenyls [PCBs]monthly averagereport only (ug/L)all year020
Polychlorinated biphenyls [PCBs]daily maximumreport only (ug/L)all year020
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year020
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year020

How strict are these limits?

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

Same industry: the 39 Chemicals and Allied Products permits in Kentucky.

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Your permit document is the final word. As JSON: /api/v1/permits/KY0004049 · MCP: https://passage-data.com/mcp