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Calpine Operating Services Co Inc

Electric Services, major discharger, Edinburg, Texas. NPDES permit TX0119423 expired Jan 26, 2026; its limits still apply. 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 (34 values), outfall 101 form A monthly (8 values), outfall 201 form A monthly (12 values), outfall TX1 form S twice a year, outfall TX1 form Y yearly, outfall TXA form S twice a year
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 41 reports late

Limits in force (80)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly minimum≥ 5 mg/Lall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Nitrogen, ammonia total [as N]daily average≤ 3 mg/Lall year001
Nitrogen, ammonia total [as N]daily maximum≤ 7 mg/Lall year001
Nitrogen, ammonia total [as N]daily average≤ 23 lb/dall year001
Nitrogen, ammonia total [as N]daily maximum≤ 53.7 lb/dall year001
Nitrogen, nitrate total [as N]daily average≤ 137 mg/Lall year001
Nitrogen, nitrate total [as N]daily maximum≤ 289 mg/Lall year001
Nitrogen, nitrate total [as N]daily average≤ 1052 lb/dall year001
Nitrogen, nitrate total [as N]daily maximum≤ 2219 lb/dall year001
Chloride [as Cl]daily average≤ 4250 mg/Lall year001
Chloride [as Cl]daily maximum≤ 8991 mg/Lall year001
Chloride [as Cl]daily average≤ 32628 lb/dall year001
Chloride [as Cl]daily maximum≤ 69027 lb/dall year001
Sulfate, total [as SO4]daily average≤ 3270 mg/Lall year001
Sulfate, total [as SO4]daily maximum≤ 6918 mg/Lall year001
Sulfate, total [as SO4]daily average≤ 25105 lb/dall year001
Sulfate, total [as SO4]daily maximum≤ 53112 lb/dall year001
Chromium, total [as Cr]daily average≤ .2 mg/Lall year001
Chromium, total [as Cr]daily maximum≤ .2 mg/Lall year001
Zinc, total [as Zn]daily average≤ 1 mg/Lall year001
Zinc, total [as Zn]daily maximum≤ 1 mg/Lall year001
Flow, in conduit or thru treatment plantdaily average≤ .92 MGDall year001
Flow, in conduit or thru treatment plantdaily maximum≤ 1.84 MGDall year001
Chlorine, total residualdaily maximum≤ .1 mg/Lall year001
Solids, total dissolveddaily average≤ 10370 mg/Lall year001
Solids, total dissolveddaily maximum≤ 21938 mg/Lall year001
Solids, total dissolveddaily average≤ 79614 lb/dall year001
Solids, total dissolveddaily maximum≤ 168426 lb/dall year001
BOD, carbonaceous [5 day, 20 C]daily average≤ 30 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 45 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]daily average≤ 230 lb/dall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 345 lb/dall year001
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
Copper, total [as Cu]daily average≤ 1 mg/Lall year201
Copper, total [as Cu]daily maximum≤ 1 mg/Lall year201
Iron, total [as Fe]daily average≤ 1 mg/Lall year201
Iron, total [as Fe]daily maximum≤ 1 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
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all yearTX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (pass=0;fail=1)all yearTX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (pass=0;fail=1)all yearTX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelas7-day minimumreport only (pass=0;fail=1)all yearTX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelasmonthly average minimumreport only (pass=0;fail=1)all yearTX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all yearTX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all yearTX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all yearTX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all yearTX1
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all yearTX1
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all yearTX1
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all yearTX1
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all yearTX1
LC50 Pass/Fail Static 24Hr Acute D. Pulexsingle samplereport only (pass=0;fail=1)all yearTXA
LC50 Pass/Fail Static 24Hr Acute Pimephales promelassingle 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.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/TX0119423 · MCP: https://passage-data.com/mcp