Clean Water Act discharge permit · NPDES TX0087491
TUBOSCOPE SHELDON ROAD NORTH WWTP, Houston, TX: NPDES TX0087491 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 38Pollutants under a numeric limit
- 6Pollutants with an effluent exceedance
TUBOSCOPE SHELDON ROAD NORTH WWTP, held by NATIONAL OILWELL VARCO, L.P., holds NPDES permit TX0087491, which discharges to Ditch; Hcfcd Ditch X2; Muleshoe Lk; San Jacinto Ri. EPA’s file records it issued July 31, 2018 and expiring July 31, 2023. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | TUBOSCOPE SHELDON ROAD NORTH WWTP |
|---|---|
| Permittee as filed | NATIONAL OILWELL VARCO, L.P. |
| NPDES ID | TX0087491 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | July 31, 2018 |
| Expiration date | July 31, 2023 |
| Address | Houston, TX 77049 |
| Receiving water | DITCH; HCFCD DITCH X2; MULESHOE LK; SAN JACINTO RI |
| Subwatershed | Jackson Bayou-San Jacinto River (HUC 120401040704) |
| SIC | 1389 – Oil And Gas Field Services |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.
Effluent limits and exceedances
- 38Pollutants on file
- 38Under a numeric limit
- 37With 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 | 3 | 136 | 10 | November 30, 2019 | 1,164% over the limit |
| Flow, in conduit or thru treatment plant | 2 | 94 | 4 | June 30, 2014 | 22,122% over the limit |
| Chlorine, total residual | 2 | 90 | 2 | October 31, 2020 | 95% over the limit |
| E. coli | 2 | 12 | 2 | February 28, 2018 | 398% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 3 | 130 | 1 | July 31, 2009 | 180% over the limit |
| Oxygen, dissolved [DO] | 1 | 45 | 1 | January 31, 2015 | 20% over the limit |
| Nitrogen, ammonia total [as N] | 3 | 129 | 0 | ||
| pH | 3 | 95 | 0 | ||
| Arsenic, dry weight | 5 | 35 | 0 | ||
| Chromium, sludge, total, dry weight [as Cr] | 5 | 35 | 0 | ||
| Selenium, dry weight | 3 | 21 | 0 | ||
| Copper, dry weight | 3 | 21 | 0 | ||
| Cadmium, dry weight | 3 | 21 | 0 | ||
| Molybdenum, sludge, total, dry weight [as Mo] | 3 | 21 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 3 | 21 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 3 | 21 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 3 | 21 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 3 | 21 | 0 | ||
| Nickel, total [as Ni] | 2 | 14 | 0 | ||
| Level of pathogen requirements achieved | 2 | 14 | 0 | ||
| Description of pathogen option used | 2 | 14 | 0 | ||
| Vector attraction reduction alternative used | 2 | 14 | 0 | ||
| Polychlorinated biphenyls [PCBs] | 1 | 8 | 0 | ||
| Compliance w/part 258 sludge requirement | 1 | 8 | 0 | ||
| Fecal coliform | 1 | 7 | 0 | ||
| Toxicity characteristic leaching procedure | 1 | 7 | 0 | ||
| Annual amt sludge disposed in landfill | 1 | 7 | 0 | ||
| Annual amt sludge transported interstate | 1 | 7 | 0 | ||
| Unit w/liner/leachate collection system | 1 | 7 | 0 | ||
| Boundary areas | 1 | 7 | 0 | ||
| Salmonella | 1 | 7 | 0 | ||
| Pollutant table from 503.13 | 1 | 7 | 0 | ||
| Ann. amt sludge disposed by other method | 1 | 6 | 0 | ||
| Annual amt of sludge incinerated | 1 | 6 | 0 | ||
| Annual sludge production, total | 1 | 6 | 0 | ||
| Annual amount of sludge land applied | 1 | 6 | 0 | ||
| Annual amt. sludge disposed surface unit | 1 | 6 | 0 | ||
| Annual whole sludge application rate | 1 | 0 | 0 |
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES TX0087491.
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.