Passage Data · Check a report · Use it from your AI

STP Nuclear Operating Company

Electric Services, major discharger, Bay City, Texas. NPDES permit TX0064947, in force until Feb 14, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form A monthly (9 values), outfall 101 form A monthly (8 values), outfall 201 form A monthly (8 values), outfall 401 form A monthly (9 values), outfall 501 form A monthly (12 values), outfall 601 form A monthly (9 values), and 7 more forms
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 86 reports late

Limits in force (117)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitdaily average≤ 95 deg Fall year001
Temperature, water deg. fahrenheitdaily maximum≤ 97 deg Fall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Flow, in conduit or thru treatment plantdaily average≤ 144 MGDall year001
Flow, in conduit or thru treatment plantdaily maximum≤ 200 MGDall year001
Chlorine, total residualdaily maximum≤ .05 mg/Lall year001
Enterococcidaily average≤ 35 CFU/100mLall year001
Enterococcidaily maximum≤ 104 CFU/100mLall year001
Temperature, water deg. fahrenheitdaily maximum≤ 95 deg Fall year002
pHminimum≥ 6 SUall year002
pHmaximum≤ 9 SUall year002
Chlorine, total residualdaily maximum≤ .05 mg/Lall year002
Flow [dry weather]daily averagereport only (MGD)all year002
Flow [dry weather]daily maximumreport only (MGD)all year002
Temperature, water deg. fahrenheitdaily maximum≤ 95 deg Fall year003
pHminimum≥ 6 SUall year003
pHmaximum≤ 9 SUall year003
Chlorine, total residualdaily maximum≤ .05 mg/Lall year003
Flow [dry weather]daily averagereport only (MGD)all year003
Flow [dry weather]daily maximumreport only (MGD)all year003
Temperature, water deg. fahrenheitdaily maximum≤ 95 deg Fall year004
pHminimum≥ 6 SUall year004
pHmaximum≤ 9 SUall year004
Chlorine, total residualdaily maximum≤ .05 mg/Lall year004
Flow [dry weather]daily averagereport only (MGD)all year004
Flow [dry weather]daily maximumreport only (MGD)all year004
Temperature, water deg. fahrenheitdaily maximum≤ 95 deg Fall year005
pHminimum≥ 6 SUall year005
pHmaximum≤ 9 SUall year005
Chlorine, total residualdaily maximum≤ .05 mg/Lall year005
Flow [dry weather]daily averagereport only (MGD)all year005
Flow [dry weather]daily maximumreport only (MGD)all year005
Temperature, water deg. fahrenheitdaily maximum≤ 95 deg Fall year006
pHminimum≥ 6 SUall year006
pHmaximum≤ 9 SUall year006
Chlorine, total residualdaily maximum≤ .05 mg/Lall year006
Flow [dry weather]daily averagereport only (MGD)all year006
Flow [dry weather]daily maximumreport only (MGD)all year006
pHminimum≥ 6 SUall year101
pHmaximum≤ 9 SUall year101
Solids, total suspendeddaily average≤ 30 mg/Lall year101
Solids, total suspendeddaily maximum≤ 100 mg/Lall year101
Oil & Greasedaily average≤ 15 mg/Lall year101
Oil & Greasedaily maximum≤ 20 mg/Lall year101
Flow, in conduit or thru treatment plantdaily averagereport only (MGD)all year101
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year101
pHminimum≥ 6 SUall year201
pHmaximum≤ 9 SUall year201
Solids, total suspendeddaily average≤ 30 mg/Lall year201
Solids, total suspendeddaily maximum≤ 100 mg/Lall year201
Oil & Greasedaily average≤ 15 mg/Lall year201
Oil & Greasedaily maximum≤ 20 mg/Lall year201
Flow, in conduit or thru treatment plantdaily averagereport only (MGD)all year201
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year201
BOD, 5-day, 20 deg. Cdaily average≤ 20 mg/Lall year401
BOD, 5-day, 20 deg. Cdaily maximum≤ 45 mg/Lall year401
pHminimum≥ 6 SUall year401
pHmaximum≤ 9 SUall year401
Solids, total suspendeddaily average≤ 20 mg/Lall year401
Solids, total suspendeddaily maximum≤ 45 mg/Lall year401
Flow, in conduit or thru treatment plantdaily averagereport only (MGD)all year401
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year401
Chlorine, total residualmonthly minimum≥ 1 mL/Lall year401
pHminimum≥ 6 SUall year501
pHmaximum≤ 9 SUall year501
Solids, total suspendeddaily average≤ 30 mg/Lall year501
Solids, total suspendeddaily maximum≤ 100 mg/Lall year501
Oil & Greasedaily average≤ 15 mg/Lall year501
Oil & Greasedaily maximum≤ 20 mg/Lall year501
Copper, total [as Cu]daily average≤ .5 mg/Lall year501
Copper, total [as Cu]daily maximum≤ 1 mg/Lall year501
Iron, total [as Fe]daily average≤ 1 mg/Lall year501
Iron, total [as Fe]daily maximum≤ 1 mg/Lall year501
Flow, in conduit or thru treatment plantdaily averagereport only (MGD)all year501
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year501
BOD, 5-day, 20 deg. Cdaily average≤ 20 mg/Lall year601
BOD, 5-day, 20 deg. Cdaily maximum≤ 45 mg/Lall year601
pHminimum≥ 6 SUall year601
pHmaximum≤ 9 SUall year601
Solids, total suspendeddaily average≤ 20 mg/Lall year601
Solids, total suspendeddaily maximum≤ 45 mg/Lall year601
Flow, in conduit or thru treatment plantdaily averagereport only (MGD)all year601
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year601
Chlorine, total residualmonthly minimum≥ 1 mg/Lall year601
Whole effluent toxicity - retest #17-day minimumreport only (pass=0;fail=1)all yearTX1
Whole effluent toxicity - retest #1monthly average minimumreport only (pass=0;fail=1)all yearTX1
Whole effluent toxicity - retest #27-day minimumreport only (pass=0;fail=1)all yearTX1
Whole effluent toxicity - retest #2monthly average minimumreport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)7-day minimumreport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)monthly average minimumreport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia menidia7-day minimumreport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia menidiamonthly average minimumreport only (pass=0;fail=1)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)7-day minimumreport only (%)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)monthly average minimumreport only (%)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Menidia menidia7-day minimumreport only (%)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Menidia menidiamonthly average minimumreport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)7-day minimumreport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)monthly average minimumreport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia7-day minimumreport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia menidiamonthly average minimumreport only (%)all yearTX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)7-day minimumreport only (pass=0;fail=1)all yearTX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)monthly average minimumreport only (pass=0;fail=1)all yearTX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia7-day minimumreport only (pass=0;fail=1)all yearTX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia menidiamonthly average minimumreport only (pass=0;fail=1)all yearTX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)7-day minimumreport only (%)all yearTX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)monthly average minimumreport only (%)all yearTX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia menidia7-day minimumreport only (%)all yearTX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia menidiamonthly average minimumreport only (%)all yearTX1
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)7-day minimumreport only (%)all yearTX1
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)monthly average minimumreport only (%)all yearTX1
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Menidia menidia7-day minimumreport only (%)all yearTX1
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Menidia menidiamonthly average minimumreport only (%)all yearTX1
Whole effluent toxicity - retest #1single samplereport only (pass=0;fail=1)all yearTXA
Whole effluent toxicity - retest #2single samplereport only (pass=0;fail=1)all yearTXA
LC50 Pass/Fail Static 24Hr Acute Americamysis bahia (formerly Mysidopsis bahia)single samplereport only (pass=0;fail=1)all yearTXA
LC50 Pass/Fail Static 24Hr Acute Menidia menidiasingle samplereport only (pass=0;fail=1)all yearTXA

How strict are these limits?

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

Same industry: the 87 Electric Services permits in Texas.

Check this month's numbers Email me before each report is due

· Save this facility as a site · Superfund sites nearby · Your permits on one board

On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/TX0064947 · MCP: https://passage-data.com/mcp