CALPINE OPERATING SERVICES CO INC

NPDES permit TX0119423 · Major NON-POTW · administratively continued, expires 2026-01-26 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

This permit expired on 2026-01-26 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

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

0values over a limit
0required values missing, on 0 form(s)
0of 38 forms filed late

Last period with anything received: 2026-07-31.

Reporting

Reports are due about 20 days after each monitoring period ends (the most common figure among TX permits in EPA's filings — check your permit).

Limits in force (80)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]MO MIN >= 5 mg/L all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001Nitrogen, ammonia total [as N]DAILY AV <= 3 mg/L all year
001Nitrogen, ammonia total [as N]DAILY MX <= 7 mg/L all year
001Nitrogen, ammonia total [as N]DAILY AV <= 23 lb/d all year
001Nitrogen, ammonia total [as N]DAILY MX <= 53.7 lb/d all year
001Nitrogen, nitrate total [as N]DAILY AV <= 137 mg/L all year
001Nitrogen, nitrate total [as N]DAILY MX <= 289 mg/L all year
001Nitrogen, nitrate total [as N]DAILY AV <= 1052 lb/d all year
001Nitrogen, nitrate total [as N]DAILY MX <= 2219 lb/d all year
001Chloride [as Cl]DAILY AV <= 4250 mg/L all year
001Chloride [as Cl]DAILY MX <= 8991 mg/L all year
001Chloride [as Cl]DAILY AV <= 32628 lb/d all year
001Chloride [as Cl]DAILY MX <= 69027 lb/d all year
001Sulfate, total [as SO4]DAILY AV <= 3270 mg/L all year
001Sulfate, total [as SO4]DAILY MX <= 6918 mg/L all year
001Sulfate, total [as SO4]DAILY AV <= 25105 lb/d all year
001Sulfate, total [as SO4]DAILY MX <= 53112 lb/d all year
001Chromium, total [as Cr]DAILY AV <= .2 mg/L all year
001Chromium, total [as Cr]DAILY MX <= .2 mg/L all year
001Zinc, total [as Zn]DAILY AV <= 1 mg/L all year
001Zinc, total [as Zn]DAILY MX <= 1 mg/L all year
001Flow, in conduit or thru treatment plantDAILY AV <= .92 MGD all year
001Flow, in conduit or thru treatment plantDAILY MX <= 1.84 MGD all year
001Chlorine, total residualDAILY MX <= .1 mg/L all year
001Solids, total dissolvedDAILY AV <= 10370 mg/L all year
001Solids, total dissolvedDAILY MX <= 21938 mg/L all year
001Solids, total dissolvedDAILY AV <= 79614 lb/d all year
001Solids, total dissolvedDAILY MX <= 168426 lb/d all year
001BOD, carbonaceous [5 day, 20 C]DAILY AV <= 30 mg/L all year
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 45 mg/L all year
001BOD, carbonaceous [5 day, 20 C]DAILY AV <= 230 lb/d all year
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 345 lb/d all year
101pHMINIMUM >= 6 SU all year
101pHMAXIMUM <= 9 SU all year
101Solids, total suspendedDAILY AV <= 30 mg/L all year
101Solids, total suspendedDAILY MX <= 100 mg/L all year
101Oil & GreaseDAILY AV <= 15 mg/L all year
101Oil & GreaseDAILY MX <= 20 mg/L all year
101Flow, in conduit or thru treatment plantDAILY AV report only all year
101Flow, in conduit or thru treatment plantDAILY MX report only all year
201pHMINIMUM >= 6 SU all year
201pHMAXIMUM <= 9 SU all year
201Solids, total suspendedDAILY AV <= 30 mg/L all year
201Solids, total suspendedDAILY MX <= 100 mg/L all year
201Oil & GreaseDAILY AV <= 15 mg/L all year
201Oil & GreaseDAILY MX <= 20 mg/L all year
201Copper, total [as Cu]DAILY AV <= 1 mg/L all year
201Copper, total [as Cu]DAILY MX <= 1 mg/L all year
201Iron, total [as Fe]DAILY AV <= 1 mg/L all year
201Iron, total [as Fe]DAILY MX <= 1 mg/L all year
201Flow, in conduit or thru treatment plantDAILY AV report only all year
201Flow, in conduit or thru treatment plantDAILY MX report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TX1Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX1Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelas7 DA MIN report only all year
TX1Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelasMO AV MN report only all year
TX1LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX1LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TX1LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX1LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TXALC50 Pass/Fail Static 24Hr Acute D. PulexSINGSAMP report only all year
TXALC50 Pass/Fail Static 24Hr Acute Pimephales promelasSINGSAMP report only all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states