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Clean Water Act discharge permit · NPDES TX0138886

FLAGSTONE WWTP, Humble, TX: NPDES TX0138886 discharge permit, effluent exceedances, inspections, penalties

FLAGSTONE WWTP, held by QUADVEST LP, holds NPDES permit TX0138886, which discharges to Unnamed Trib; Hcfcdd K1070000;Cypress Crk. EPA’s file records it issued September 10, 2019 and expiring September 10, 2024.

FLAGSTONE WWTP, Humble, Texas: Individual permit TX0138886, held by QUADVEST LP; Administratively continued (past its expiration date and still in force until reissued); issued September 10, 2019, term to September 10, 2024; discharges to UNNAMED TRIB; HCFCDD K1070000;CYPRESS CRK.

  • Solids, total suspended: 3 limits, 2 violations of any kind, 2 effluent exceedances, latest July 31, 2025, largest 283% over the limit.
  • BOD, carbonaceous [5 day, 20 C]: 3 limits, 2 violations of any kind, 2 effluent exceedances, latest July 31, 2025, largest 100% over the limit.
  • Flow, in conduit or thru treatment plant: 2 limits, 2 violations of any kind, 2 effluent exceedances, latest June 30, 2026, largest 9% over the limit.
  • Nitrogen, ammonia total [as N]: 3 limits, 1 violation of any kind, 1 effluent exceedance, latest May 31, 2026, largest 14% over the limit.
  • E. coli: 2 limits, 1 violation of any kind, 1 effluent exceedance, latest January 31, 2026, largest 63% over the limit.
  • pH: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • Chlorine, total residual: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • Oxygen, dissolved [DO]: 1 limit, 0 violations of any kind, 0 effluent exceedances.

Other permits held by QUADVEST LP

FLAGSTONE WWTP among its neighbors

EPA’s permit file holds 170 discharge permits in the Turkey Creek-Cypress Creek subwatershed (HUC 120401020107), TX0138886 among them. Its county holds 4,455, 195 of them major permits; TX0138886 is a minor permit.

Other permits in the Turkey Creek-Cypress Creek subwatershed (HUC 120401020107)

Identity

Facility as filedFLAGSTONE WWTP
Permittee as filedQUADVEST LP
NPDES IDTX0138886
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeIndividual permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
IssuedSeptember 10, 2019
Expiration dateSeptember 10, 2024
AddressHumble, TX 77338
Receiving waterUNNAMED TRIB; HCFCDD K1070000;CYPRESS CRK
SubwatershedTurkey Creek-Cypress Creek (HUC 120401020107)
SIC4952 – Sewerage Systems

Effluent limits and exceedances

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 measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
Solids, total suspended322July 31, 2025283% over the limit
BOD, carbonaceous [5 day, 20 C]322July 31, 2025100% over the limit
Flow, in conduit or thru treatment plant222June 30, 20269% over the limit
Nitrogen, ammonia total [as N]311May 31, 202614% over the limit
E. coli211January 31, 202663% over the limit
pH200
Chlorine, total residual200
Oxygen, dissolved [DO]100

Inspections, violations and enforcement

EPA’s single-event violation file, as loaded, holds no violation for NPDES TX0138886.

Inspections

EPA’s inspection file holds no inspection for NPDES TX0138886.

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 TX0138886.

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Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

What this page shows

This public-records page covers NPDES permit TX0138886 for the FLAGSTONE WWTP in Humble, TX, held by QUADVEST LP, with the permit listed as administratively continued. The facts list 8 pollutants under a numeric limit or with effluent exceedances, along with 5 pollutants with an effluent exceedance, and identify the receiving waters as UNNAMED TRIB; HCFCDD K1070000;CYPRESS CRK in the Turkey Creek-Cypress Creek subwatershed (HUC 120401020107).