Clean Water Act discharge permit · NPDES TX0063681
CALAVERAS POWER STATION, San Antonio, TX: NPDES TX0063681 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 27Pollutants under a numeric limit
- 6Pollutants with an effluent exceedance
- 1Inspections on file
- 0Formal enforcement actions
CALAVERAS POWER STATION, held by CITY PUBLIC SERVICE OF SAN ANTONIO, holds NPDES permit TX0063681, which discharges to Upper San Antonio River. EPA’s file records it issued November 6, 2020 and expiring November 6, 2025.
CALAVERAS POWER STATION, San Antonio, Texas: Individual permit TX0063681, held by CITY PUBLIC SERVICE OF SAN ANTONIO; Administratively continued (past its expiration date and still in force until reissued); issued November 6, 2020, term to November 6, 2025; discharges to Upper San Antonio River.
- Solids, total suspended: 32 limits, 98 violations of any kind, 41 effluent exceedances, latest July 31, 2018, largest 2,393% over the limit.
- pH: 36 limits, 78 violations of any kind, 8 effluent exceedances, latest March 31, 2017.
- Oil & Grease: 33 limits, 61 violations of any kind, 8 effluent exceedances, latest December 31, 2009, largest 63% over the limit.
- Chlorine, total residual: 7 limits, 14 violations of any kind, 4 effluent exceedances, latest May 31, 2017, largest 100% over the limit.
- E. coli: 2 limits, 2 violations of any kind, 2 effluent exceedances, latest June 30, 2017, largest 502% over the limit.
- Flow, in conduit or thru treatment plant: 42 limits, 77 violations of any kind, 1 effluent exceedance, latest June 30, 2005, largest 15% over the limit.
- Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia: 8 limits, 44 violations of any kind, 0 effluent exceedances.
- NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia: 8 limits, 44 violations of any kind, 0 effluent exceedances.
- NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia: 8 limits, 44 violations of any kind, 0 effluent exceedances.
- Copper, total [as Cu]: 0 limits, 44 violations of any kind, 0 effluent exceedances.
- Iron, total [as Fe]: 0 limits, 42 violations of any kind, 0 effluent exceedances.
- Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas: 8 limits, 32 violations of any kind, 0 effluent exceedances.
- NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas: 8 limits, 32 violations of any kind, 0 effluent exceedances.
- NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas: 8 limits, 32 violations of any kind, 0 effluent exceedances.
- Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia: 8 limits, 20 violations of any kind, 0 effluent exceedances.
- LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubia: 8 limits, 20 violations of any kind, 0 effluent exceedances.
- LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubia: 8 limits, 20 violations of any kind, 0 effluent exceedances.
- LC50 Pass/Fail Static 24Hr Acute D. Pulex: 2 limits, 14 violations of any kind, 0 effluent exceedances.
- LC50 Pass/Fail Static 24Hr Acute Pimephales promelas: 2 limits, 14 violations of any kind, 0 effluent exceedances.
- BOD, 5-day, 20 deg. C: 3 limits, 10 violations of any kind, 0 effluent exceedances.
- Oxygen demand, chem. [high level] [COD]: 13 limits, 9 violations of any kind, 0 effluent exceedances.
- Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelas: 8 limits, 8 violations of any kind, 0 effluent exceedances.
- LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelas: 8 limits, 8 violations of any kind, 0 effluent exceedances.
- LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelas: 8 limits, 8 violations of any kind, 0 effluent exceedances.
- Temperature, water deg. fahrenheit: 4 limits, 8 violations of any kind, 0 effluent exceedances.
- Selenium, total [as Se]: 1 limit, 2 violations of any kind, 0 effluent exceedances.
- Whole effluent toxicity - retest #1: 14 limits, 0 violations of any kind, 0 effluent exceedances.
- Whole effluent toxicity - retest #2: 14 limits, 0 violations of any kind, 0 effluent exceedances.
- Chlorine, free available: 8 limits, 0 violations of any kind, 0 effluent exceedances.
- February 19, 2026: Evaluation (S).
Other permits held by CITY PUBLIC SERVICE OF SAN ANTONIO
- VH BRAUNIG POWER STATION, San Antonio: TX0063690, issued September 29, 2020
- LEON CREEK STEAM ELECTRIC STATION, San Antonio: TX0063703, issued February 19, 2020
CALAVERAS POWER STATION among its neighbors
EPA’s permit file holds 118 discharge permits in the Upper Calaveras Creek subwatershed (HUC 121003010302), TX0063681 among them. Its county holds 2,157, 12 of them major permits; TX0063681 is a major permit.
Other permits in the Upper Calaveras Creek subwatershed (HUC 121003010302)
- 87 PIT, San Antonio: TXR05FN77, minor permit, permit term to August 13, 2026
- 9362 HILDEBRANDT, San Antonio: TXR1568QP, minor permit, discharging to CALAVERAS RESERVOIR, permit term to March 4, 2028
- ALAMO CITY ESS, San Antonio: TXR1596XM, minor permit, discharging to HONDO CREEK, permit term to March 4, 2028
- ALAMO CITY SUBSTATION ESS, San Antonio: TXR1578WS, minor permit, discharging to SALADO CREEK, permit term to March 4, 2028
- ANNABELLE RANCH, San Antonio: TXR1564MD, minor permit, discharging to HONDO CREEK, permit term to March 4, 2028
- BLUE RIDGE - HOME BUILDING, San Antonio: TXR1579UI, minor permit, discharging to CALAVERAS RESERVIOR, permit term to March 4, 2028
- BLUE RIDGE RANCH, San Antonio: TXR1508VL, minor permit, discharging to UNNAMED TRIBUTARY TO CALAVERAS CREEK TO CALAVERAS, permit term to March 4, 2028
- BLUE RIDGE RANCH SUBD UNIT 7, San Antonio: TXR1553UF, minor permit, discharging to ROSILLO CREEK 1910B, permit term to March 4, 2028
- BLUERIDGE RANCH, San Antonio: TXR1590SC, minor permit, discharging to ROSILLO CREEK, permit term to March 4, 2028
- C&F TOOL & DIE, San Antonio: TXRNEBV90, minor permit, permit term to August 13, 2026
Identity
| Facility as filed | CALAVERAS POWER STATION |
|---|---|
| Permittee as filed | CITY PUBLIC SERVICE OF SAN ANTONIO |
| NPDES ID | TX0063681 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | November 6, 2020 |
| Expiration date | November 6, 2025 |
| Address | San Antonio, TX 78223 |
| Receiving water | Upper San Antonio River |
| Subwatershed | Upper Calaveras Creek (HUC 121003010302) |
| SIC | 4911 – Electric Services |
Effluent limits and exceedances
- 29Pollutants on file
- 27Under a numeric limit
- 26With a violation of any kind
- 6With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Solids, total suspended | 32 | 98 | 41 | July 31, 2018 | 2,393% over the limit |
| pH | 36 | 78 | 8 | March 31, 2017 | |
| Oil & Grease | 33 | 61 | 8 | December 31, 2009 | 63% over the limit |
| Chlorine, total residual | 7 | 14 | 4 | May 31, 2017 | 100% over the limit |
| E. coli | 2 | 2 | 2 | June 30, 2017 | 502% over the limit |
| Flow, in conduit or thru treatment plant | 42 | 77 | 1 | June 30, 2005 | 15% over the limit |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 8 | 44 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 8 | 44 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 8 | 44 | 0 | ||
| Copper, total [as Cu] | 0 | 44 | 0 | ||
| Iron, total [as Fe] | 0 | 42 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | 8 | 32 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | 8 | 32 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 8 | 32 | 0 | ||
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 8 | 20 | 0 | ||
| LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubia | 8 | 20 | 0 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubia | 8 | 20 | 0 | ||
| LC50 Pass/Fail Static 24Hr Acute D. Pulex | 2 | 14 | 0 | ||
| LC50 Pass/Fail Static 24Hr Acute Pimephales promelas | 2 | 14 | 0 | ||
| BOD, 5-day, 20 deg. C | 3 | 10 | 0 | ||
| Oxygen demand, chem. [high level] [COD] | 13 | 9 | 0 | ||
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelas | 8 | 8 | 0 | ||
| LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelas | 8 | 8 | 0 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelas | 8 | 8 | 0 | ||
| Temperature, water deg. fahrenheit | 4 | 8 | 0 | ||
| Selenium, total [as Se] | 1 | 2 | 0 | ||
| Whole effluent toxicity - retest #1 | 14 | 0 | 0 | ||
| Whole effluent toxicity - retest #2 | 14 | 0 | 0 | ||
| Chlorine, free available | 8 | 0 | 0 |
Inspections, violations and enforcement
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES TX0063681.
Inspections
| Date | What EPA recorded | Agency |
|---|---|---|
| February 19, 2026 | Evaluation | S |
Formal enforcement and penalties
0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.
Informal enforcement
EPA’s informal enforcement file holds no action for NPDES TX0063681.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.