NRG Texas Power LLC — NPDES permit TX0082651: limits, due date and EPA's record

Electric Services, major discharger, Limestone County, Texas. NPDES permit TX0082651, in force until Apr 29, 2027. Last 12 months: over a limit 4 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

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

Period ending	Parameter	Reported	Limit	Over by
June 2026	Selenium, total [as Se], daily average	.69 mg/L	≤ .0168 mg/L	4007%
June 2026	Selenium, total [as Se], daily average	9.426 lb/d	≤ .029 lb/d	32403%
June 2026	Selenium, total [as Se], daily maximum	.69 mg/L	≤ .0356 mg/L	1838%
June 2026	Selenium, total [as Se], daily maximum	9.426 lb/d	≤ .061 lb/d	15352%

Limits in force (129)

Parameter	Statistic	Limit	Months	Outfall
Temperature, water deg. fahrenheit	daily maximum	≤ 93 deg F	all year	001
pH	minimum	≥ 6 SU	all year	001
pH	maximum	≤ 9 SU	all year	001
Solids, total suspended	daily average	≤ 30 mg/L	all year	001
Solids, total suspended	daily maximum	≤ 100 mg/L	all year	001
Oil & Grease	daily average	≤ 15 mg/L	all year	001
Oil & Grease	daily maximum	≤ 20 mg/L	all year	001
Copper, total [as Cu]	daily average	report only (ug/L)	all year	001
Copper, total [as Cu]	daily maximum	report only (ug/L)	all year	001
Selenium, total [as Se]	daily average	≤ .00448 mg/L	all year	001
Selenium, total [as Se]	daily maximum	≤ .00949 mg/L	all year	001
Selenium, total [as Se]	daily average	≤ .086 lb/d	all year	001
Selenium, total [as Se]	daily maximum	≤ .182 lb/d	all year	001
Flow, in conduit or thru treatment plant	daily average	report only (MGD)	all year	001
Flow, in conduit or thru treatment plant	daily maximum	≤ 2.304 MGD	all year	001
Chlorine, free available	daily average	≤ .2 mg/L	all year	001
Chlorine, free available	daily maximum	≤ .5 mg/L	all year	001
Oxygen, dissolved [DO]	monthly minimum	≥ 5 mg/L	all year	002
pH	minimum	≥ 6 SU	all year	002
pH	maximum	≤ 9 SU	all year	002
Solids, total suspended	daily average	≤ 30 mg/L	all year	002
Solids, total suspended	daily maximum	≤ 50 mg/L	all year	002
Oil & Grease	daily average	≤ 15 mg/L	all year	002
Oil & Grease	daily maximum	≤ 20 mg/L	all year	002
Selenium, total [as Se]	daily average	≤ .0168 mg/L	all year	002
Selenium, total [as Se]	daily maximum	≤ .0356 mg/L	all year	002
Selenium, total [as Se]	daily average	≤ .029 lb/d	all year	002
Selenium, total [as Se]	daily maximum	≤ .061 lb/d	all year	002
Flow, in conduit or thru treatment plant	daily average	report only (MGD)	all year	002
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	002
pH	minimum	≥ 6 SU	all year	003
pH	maximum	≤ 9 SU	all year	003
Solids, total suspended	daily average	≤ 30 mg/L	all year	003
Solids, total suspended	daily maximum	≤ 100 mg/L	all year	003
Oil & Grease	daily average	≤ 15 mg/L	all year	003
Oil & Grease	daily maximum	≤ 20 mg/L	all year	003
Flow, in conduit or thru treatment plant	daily average	report only (MGD)	all year	003
Flow, in conduit or thru treatment plant	daily maximum	≤ .51 MGD	all year	003
pH	minimum	≥ 6 SU	all year	004
pH	maximum	≤ 9 SU	all year	004
Solids, total suspended	daily average	≤ 30 mg/L	all year	004
Solids, total suspended	daily maximum	≤ 100 mg/L	all year	004
Oil & Grease	daily average	≤ 15 mg/L	all year	004
Oil & Grease	daily maximum	≤ 20 mg/L	all year	004
Selenium, total [as Se]	daily average	≤ .00448 mg/L	all year	004
Selenium, total [as Se]	daily maximum	≤ .00949 mg/L	all year	004
Selenium, total [as Se]	daily average	≤ .016 lb/d	all year	004
Selenium, total [as Se]	daily maximum	≤ .034 lb/d	all year	004
Flow, in conduit or thru treatment plant	daily average	report only (MGD)	all year	004
Flow, in conduit or thru treatment plant	daily maximum	≤ .432 MGD	all year	004
Solids, total dissolved	daily maximum	≤ 868 mg/L	all year	004
pH	minimum	≥ 6 SU	all year	005
pH	maximum	≤ 9 SU	all year	005
Solids, total suspended	daily average	≤ 30 mg/L	all year	005
Solids, total suspended	daily maximum	≤ 100 mg/L	all year	005
Oil & Grease	daily average	≤ 15 mg/L	all year	005
Oil & Grease	daily maximum	≤ 20 mg/L	all year	005
Copper, total [as Cu]	daily average	≤ .0197 mg/L	all year	005
Copper, total [as Cu]	daily maximum	≤ .0416 mg/L	all year	005
Iron, total [as Fe]	daily average	≤ 1 mg/L	all year	005
Iron, total [as Fe]	daily maximum	≤ 1 mg/L	all year	005
Selenium, total [as Se]	daily average	≤ .00448 mg/L	all year	005
Selenium, total [as Se]	daily maximum	≤ .00949 mg/L	all year	005
Selenium, total [as Se]	daily average	≤ .0081 lb/d	all year	005
Selenium, total [as Se]	daily maximum	≤ .017 lb/d	all year	005
Flow, in conduit or thru treatment plant	daily average	report only (MGD)	all year	005
Flow, in conduit or thru treatment plant	daily maximum	≤ .216 MGD	all year	005
Oxygen, dissolved [DO]	monthly minimum	≥ 4 mg/L	all year	006
BOD, 5-day, 20 deg. C	daily average	≤ 10 mg/L	all year	006
BOD, 5-day, 20 deg. C	daily maximum	≤ 25 mg/L	all year	006
BOD, 5-day, 20 deg. C	daily average	≤ 5 lb/d	all year	006
pH	minimum	≥ 6 SU	all year	006
pH	maximum	≤ 9 SU	all year	006
Solids, total suspended	daily average	≤ 15 mg/L	all year	006
Solids, total suspended	daily maximum	≤ 40 mg/L	all year	006
Solids, total suspended	daily average	≤ 7.5 lb/d	all year	006
Flow, in conduit or thru treatment plant	daily average	≤ .06 MGD	all year	006
Flow, in conduit or thru treatment plant	daily maximum	≤ .09 MGD	all year	006
Chlorine, total residual	monthly minimum	≥ 1 mg/L	all year	006
Chlorine, total residual	monthly maximum	≤ 4 mg/L	all year	006
E. coli	daily average	≤ 126 CFU/100mL	all year	006
E. coli	daily maximum	≤ 399 CFU/100mL	all year	006
Oxygen, dissolved [DO]	monthly minimum	≥ 4 mg/L	all year	007
BOD, 5-day, 20 deg. C	daily average	≤ 10 mg/L	all year	007
BOD, 5-day, 20 deg. C	daily maximum	≤ 25 mg/L	all year	007
BOD, 5-day, 20 deg. C	daily average	≤ .25 lb/d	all year	007
pH	minimum	≥ 6 SU	all year	007
pH	maximum	≤ 9 SU	all year	007
Solids, total suspended	daily average	≤ 15 mg/L	all year	007
Solids, total suspended	daily maximum	≤ 40 mg/L	all year	007
Solids, total suspended	daily average	≤ .38 lb/d	all year	007
Flow, in conduit or thru treatment plant	daily average	≤ .003 MGD	all year	007
Flow, in conduit or thru treatment plant	daily maximum	≤ .006 MGD	all year	007
Chlorine, total residual	monthly minimum	≥ 1 mg/L	all year	007
Chlorine, total residual	monthly maximum	≤ 4 mg/L	all year	007
E. coli	daily average	≤ 126 CFU/100mL	all year	007
E. coli	daily maximum	≤ 399 CFU/100mL	all year	007
pH	minimum	≥ 6 SU	all year	008
pH	maximum	≤ 9 SU	all year	008
Solids, total suspended	daily average	≤ 30 mg/L	all year	008
Solids, total suspended	daily maximum	≤ 100 mg/L	all year	008
Oil & Grease	daily average	≤ 15 mg/L	all year	008
Oil & Grease	daily maximum	≤ 20 mg/L	all year	008
Selenium, total [as Se]	daily average	≤ .0168 mg/L	all year	008
Selenium, total [as Se]	daily maximum	≤ .0356 mg/L	all year	008
Selenium, total [as Se]	daily average	≤ .01 lb/d	all year	008
Selenium, total [as Se]	daily maximum	≤ .02 lb/d	all year	008
Flow, in conduit or thru treatment plant	daily average	report only (MGD)	all year	008
Flow, in conduit or thru treatment plant	daily maximum	≤ .072 MGD	all year	008
Whole effluent toxicity - retest #1	48-hour minimum	report only (pass=0;fail=1)	all year	TX1
Whole effluent toxicity - retest #1	monthly average minimum	report only (pass=0;fail=1)	all year	TX1
Whole effluent toxicity - retest #2	48-hour minimum	report only (pass=0;fail=1)	all year	TX1
Whole effluent toxicity - retest #2	monthly average minimum	report only (pass=0;fail=1)	all year	TX1
Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex	48-hour minimum	report only (pass=0;fail=1)	all year	TX1
Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex	monthly average minimum	report only (pass=0;fail=1)	all year	TX1
LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas	48-hour minimum	report only (pass=0;fail=1)	all year	TX1
LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas	monthly average minimum	report only (pass=0;fail=1)	all year	TX1
NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex	48-hour minimum	report only (%)	all year	TX1
NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex	monthly average minimum	report only (%)	all year	TX1
NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas	48-hour minimum	report only (%)	all year	TX1
NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas	monthly average minimum	report only (%)	all year	TX1
LOAEC Lethal Static Renewal 48HR Acute Daphnia pulex	48-hour minimum	report only (%)	all year	TX1
LOAEC Lethal Static Renewal 48HR Acute Daphnia pulex	monthly average minimum	report only (%)	all year	TX1
LOAEC Lethal Survival Static Renewal 48Hr Acute Pimephales promelas	48-hour minimum	report only (%)	all year	TX1
LOAEC Lethal Survival Static Renewal 48Hr Acute Pimephales promelas	monthly average minimum	report only (%)	all year	TX1
Whole effluent toxicity - retest #1	single sample	report only (pass=0;fail=1)	all year	TXA
Whole effluent toxicity - retest #2	single sample	report only (pass=0;fail=1)	all year	TXA
LC50 Pass/Fail Static 24Hr Acute D. Pulex	single sample	report only (pass=0;fail=1)	all year	TXA
LC50 Pass/Fail Static 24Hr Acute Pimephales promelas	single sample	report only (pass=0;fail=1)	all year	TXA

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/TX0082651 · MCP: https://passage-data.com/mcp