Clean Water Act discharge permit · NPDES TX0094684
CHISOS BASIN WWTP, Big Bend National Park, TX: NPDES TX0094684 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 37Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
- 0Inspections on file
- 0Formal enforcement actions
CHISOS BASIN WWTP, held by US DEPT OF THE INTERIOR, holds NPDES permit TX0094684, which discharges to Unnamed Tributary; Oak Creek. EPA’s file records it issued September 4, 2015 and expiring September 1, 2020.
CHISOS BASIN WWTP, Big Bend National Park, Texas: Individual permit TX0094684, held by US DEPT OF THE INTERIOR; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued September 4, 2015, term to September 1, 2020; discharges to UNNAMED TRIBUTARY; OAK CREEK.
- Flow, in conduit or thru treatment plant: 2 limits, 78 violations of any kind, 22 effluent exceedances, latest July 31, 2009, largest 121% over the limit.
- BOD, 5-day, 20 deg. C: 3 limits, 92 violations of any kind, 1 effluent exceedance, latest December 31, 2005, largest 139% over the limit.
- Solids, total suspended: 3 limits, 89 violations of any kind, 1 effluent exceedance, latest December 31, 2005, largest 867% over the limit.
- Chlorine, total residual: 2 limits, 82 violations of any kind, 1 effluent exceedance, latest April 30, 2011, largest 100% over the limit.
- Oxygen, dissolved [DO]: 1 limit, 29 violations of any kind, 1 effluent exceedance, latest May 31, 2003, largest 25% over the limit.
- pH: 3 limits, 65 violations of any kind, 0 effluent exceedances.
- Arsenic, dry weight: 5 limits, 40 violations of any kind, 0 effluent exceedances.
- Chromium, sludge, total, dry weight [as Cr]: 5 limits, 40 violations of any kind, 0 effluent exceedances.
- Selenium, dry weight: 3 limits, 24 violations of any kind, 0 effluent exceedances.
- Copper, dry weight: 3 limits, 24 violations of any kind, 0 effluent exceedances.
- Cadmium, dry weight: 3 limits, 24 violations of any kind, 0 effluent exceedances.
- Molybdenum, sludge, total, dry weight [as Mo]: 3 limits, 24 violations of any kind, 0 effluent exceedances.
- Zinc, sludge, total, dry weight [as Zn]: 3 limits, 24 violations of any kind, 0 effluent exceedances.
- Lead, sludge, total, dry weight [as Pb]: 3 limits, 24 violations of any kind, 0 effluent exceedances.
- Nickel, sludge, total, dry weight [as Ni]: 3 limits, 24 violations of any kind, 0 effluent exceedances.
- Mercury, sludge, total, dry weight [as Hg]: 3 limits, 24 violations of any kind, 0 effluent exceedances.
- Nickel, total [as Ni]: 2 limits, 16 violations of any kind, 0 effluent exceedances.
- Level of pathogen requirements achieved: 2 limits, 16 violations of any kind, 0 effluent exceedances.
- Description of pathogen option used: 2 limits, 16 violations of any kind, 0 effluent exceedances.
- Vector attraction reduction alternative used: 2 limits, 16 violations of any kind, 0 effluent exceedances.
- Fecal coliform: 1 limit, 8 violations of any kind, 0 effluent exceedances.
- Polychlorinated biphenyls [PCBs]: 1 limit, 8 violations of any kind, 0 effluent exceedances.
- Toxicity characteristic leaching procedure: 1 limit, 8 violations of any kind, 0 effluent exceedances.
- Ann. amt sludge disposed by other method: 1 limit, 8 violations of any kind, 0 effluent exceedances.
- Annual amt of sludge incinerated: 1 limit, 8 violations of any kind, 0 effluent exceedances.
- Annual sludge production, total: 1 limit, 8 violations of any kind, 0 effluent exceedances.
- Annual amount of sludge land applied: 1 limit, 8 violations of any kind, 0 effluent exceedances.
- Annual amt. sludge disposed surface unit: 1 limit, 8 violations of any kind, 0 effluent exceedances.
- Annual amt sludge disposed in landfill: 1 limit, 8 violations of any kind, 0 effluent exceedances.
- Annual amt sludge transported interstate: 1 limit, 8 violations of any kind, 0 effluent exceedances.
- Unit w/liner/leachate collection system: 1 limit, 8 violations of any kind, 0 effluent exceedances.
- Compliance w/part 258 sludge requirement: 1 limit, 8 violations of any kind, 0 effluent exceedances.
- Boundary areas: 1 limit, 8 violations of any kind, 0 effluent exceedances.
- Salmonella: 1 limit, 8 violations of any kind, 0 effluent exceedances.
- Pollutant table from 503.13: 1 limit, 8 violations of any kind, 0 effluent exceedances.
- E. coli: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Annual whole sludge application rate: 1 limit, 0 violations of any kind, 0 effluent exceedances.
- March 16, 2026: Letter of Violation/ Warning Letter (State).
Texas holds 1,720 Publicly owned treatment works coverages of this permit type in EPA’s file; 166 were issued before TX0094684.
Coverages issued nearest TX0094684
- August 6, 2015: LAGUNA MADRE WWTP, Corpus Christi, TX0047104, held by CORPUS CHRISTI, CITY OF
- August 27, 2015: CITY OF BRACKETTVILLE FT CLARK MUD WWTP, Brackettville, TX0112119, held by BRACKETLVILLE, CITY OF
- August 27, 2015: CHASE FIELD WWTF, Beeville, TX0113859, held by BEEVILLE, CITY OF
- September 4, 2015: CITY OF ORANGE GROVE WWTP, Orange Grove, TX0020397, held by ORANGE GROVE, CITY OF
- September 4, 2015: CITY OF PORTLAND WWTP, Portland, TX0055433, held by PORTLAND, CITY OF
- September 10, 2015: CITY OF SMILEY WWTP, Smiley, TX0069809, held by SMILEY, CITY OF
- September 10, 2015: SIERRA BLANCA, Sierra Blanca, TX0115657, held by HADRPETH CO WCID 1
- September 22, 2015: CITY OF HARLINGEN WATERWORKS SYSTEM WWTP, Harlingen, TX0047929, held by CITY OF HARLINGEN WATERWORKS SYSTEM
- September 22, 2015: LIBERTY HILL REGIONAL WWTP, Williamson County, TX0126195, held by LIBERTY HILL, CITY OF
- September 28, 2015: SAN FELIPE WWTP, Del Rio, TX0047198, held by CITY OF DEL RIO
CHISOS BASIN WWTP among its neighbors
EPA’s permit file holds 1 discharge permits in the Upper Rough Run subwatershed (HUC 130402040401), TX0094684 among them. Its county holds 10, 1 of them major permits; TX0094684 is a minor permit.
Identity
| Facility as filed | CHISOS BASIN WWTP |
|---|---|
| Permittee as filed | US DEPT OF THE INTERIOR |
| NPDES ID | TX0094684 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Federal facility |
| Program | Publicly owned treatment works |
| Issued | September 4, 2015 |
| Expiration date | September 1, 2020 |
| Address | Big Bend National Park, TX 79834 |
| Receiving water | UNNAMED TRIBUTARY; OAK CREEK |
| Subwatershed | Upper Rough Run (HUC 130402040401) |
Effluent limits and exceedances
- 37Pollutants on file
- 37Under a numeric limit
- 36With a violation of any kind
- 5With 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 |
|---|---|---|---|---|---|
| Flow, in conduit or thru treatment plant | 2 | 78 | 22 | July 31, 2009 | 121% over the limit |
| BOD, 5-day, 20 deg. C | 3 | 92 | 1 | December 31, 2005 | 139% over the limit |
| Solids, total suspended | 3 | 89 | 1 | December 31, 2005 | 867% over the limit |
| Chlorine, total residual | 2 | 82 | 1 | April 30, 2011 | 100% over the limit |
| Oxygen, dissolved [DO] | 1 | 29 | 1 | May 31, 2003 | 25% over the limit |
| pH | 3 | 65 | 0 | ||
| Arsenic, dry weight | 5 | 40 | 0 | ||
| Chromium, sludge, total, dry weight [as Cr] | 5 | 40 | 0 | ||
| Selenium, dry weight | 3 | 24 | 0 | ||
| Copper, dry weight | 3 | 24 | 0 | ||
| Cadmium, dry weight | 3 | 24 | 0 | ||
| Molybdenum, sludge, total, dry weight [as Mo] | 3 | 24 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 3 | 24 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 3 | 24 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 3 | 24 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 3 | 24 | 0 | ||
| Nickel, total [as Ni] | 2 | 16 | 0 | ||
| Level of pathogen requirements achieved | 2 | 16 | 0 | ||
| Description of pathogen option used | 2 | 16 | 0 | ||
| Vector attraction reduction alternative used | 2 | 16 | 0 | ||
| Fecal coliform | 1 | 8 | 0 | ||
| Polychlorinated biphenyls [PCBs] | 1 | 8 | 0 | ||
| Toxicity characteristic leaching procedure | 1 | 8 | 0 | ||
| Ann. amt sludge disposed by other method | 1 | 8 | 0 | ||
| Annual amt of sludge incinerated | 1 | 8 | 0 | ||
| Annual sludge production, total | 1 | 8 | 0 | ||
| Annual amount of sludge land applied | 1 | 8 | 0 | ||
| Annual amt. sludge disposed surface unit | 1 | 8 | 0 | ||
| Annual amt sludge disposed in landfill | 1 | 8 | 0 | ||
| Annual amt sludge transported interstate | 1 | 8 | 0 | ||
| Unit w/liner/leachate collection system | 1 | 8 | 0 | ||
| Compliance w/part 258 sludge requirement | 1 | 8 | 0 | ||
| Boundary areas | 1 | 8 | 0 | ||
| Salmonella | 1 | 8 | 0 | ||
| Pollutant table from 503.13 | 1 | 8 | 0 | ||
| E. coli | 2 | 4 | 0 | ||
| Annual whole sludge application rate | 1 | 0 | 0 |
Inspections, violations and enforcement
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES TX0094684.
Inspections
EPA’s inspection file holds no inspection for NPDES TX0094684.
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
| Date | What EPA recorded | Agency |
|---|---|---|
| March 16, 2026 | Letter of Violation/ Warning Letter | State |
Watch this permit
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.