Clean Water Act discharge permit · NPDES TX0124851
CINCO SOUTHWEST WWTP, Katy, TX: NPDES TX0124851 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 49Pollutants under a numeric limit
- 3Pollutants with an effluent exceedance
- 1Inspections on file
- 1Formal enforcement actions
CINCO SOUTHWEST WWTP, held by CINCO SOUTHWEST MUD 1, holds NPDES permit TX0124851, which discharges to Drainage Ditch; Little Prong Ck;Buffalo Bayou. EPA’s file records it issued September 13, 2017 and expiring May 1, 2022.
CINCO SOUTHWEST WWTP, Katy, Texas: Individual permit TX0124851, held by CINCO SOUTHWEST MUD 1; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued September 13, 2017, term to May 1, 2022; discharges to DRAINAGE DITCH; LITTLE PRONG CK;BUFFALO BAYOU.
- E. coli: 2 limits, 31 violations of any kind, 31 effluent exceedances, latest March 31, 2026, largest 99,999% over the limit.
- Nitrogen, ammonia total [as N]: 6 limits, 22 violations of any kind, 16 effluent exceedances, latest July 31, 2024, largest 765% over the limit.
- Oxygen, dissolved [DO]: 1 limit, 4 violations of any kind, 2 effluent exceedances, latest March 31, 2020, largest 7% over the limit.
- Flow, in conduit or thru treatment plant: 6 limits, 14 violations of any kind, 0 effluent exceedances.
- BOD, carbonaceous [5 day, 20 C]: 6 limits, 13 violations of any kind, 0 effluent exceedances.
- Solids, total suspended: 6 limits, 6 violations of any kind, 0 effluent exceedances.
- Copper, total [as Cu]: 6 limits, 6 violations of any kind, 0 effluent exceedances.
- Zinc, total [as Zn]: 6 limits, 6 violations of any kind, 0 effluent exceedances.
- pH: 3 limits, 6 violations of any kind, 0 effluent exceedances.
- Arsenic, dry weight: 5 limits, 5 violations of any kind, 0 effluent exceedances.
- Chromium, sludge, total, dry weight [as Cr]: 5 limits, 5 violations of any kind, 0 effluent exceedances.
- Coliform, fecal general: 0 limits, 4 violations of any kind, 0 effluent exceedances.
- Selenium, dry weight: 3 limits, 3 violations of any kind, 0 effluent exceedances.
- Copper, dry weight: 3 limits, 3 violations of any kind, 0 effluent exceedances.
- Cadmium, dry weight: 3 limits, 3 violations of any kind, 0 effluent exceedances.
- Molybdenum, sludge, total, dry weight [as Mo]: 3 limits, 3 violations of any kind, 0 effluent exceedances.
- Zinc, sludge, total, dry weight [as Zn]: 3 limits, 3 violations of any kind, 0 effluent exceedances.
- Lead, sludge, total, dry weight [as Pb]: 3 limits, 3 violations of any kind, 0 effluent exceedances.
- Nickel, sludge, total, dry weight [as Ni]: 3 limits, 3 violations of any kind, 0 effluent exceedances.
- Mercury, sludge, total, dry weight [as Hg]: 3 limits, 3 violations of any kind, 0 effluent exceedances.
- Whole effluent toxicity - retest #1: 3 limits, 2 violations of any kind, 0 effluent exceedances.
- Whole effluent toxicity - retest #2: 3 limits, 2 violations of any kind, 0 effluent exceedances.
- Nickel, total [as Ni]: 2 limits, 2 violations of any kind, 0 effluent exceedances.
- Level of pathogen requirements achieved: 2 limits, 2 violations of any kind, 0 effluent exceedances.
- Description of pathogen option used: 2 limits, 2 violations of any kind, 0 effluent exceedances.
- Vector attraction reduction alternative used: 2 limits, 2 violations of any kind, 0 effluent exceedances.
- Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex: 2 limits, 2 violations of any kind, 0 effluent exceedances.
- LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas: 2 limits, 2 violations of any kind, 0 effluent exceedances.
- NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex: 2 limits, 2 violations of any kind, 0 effluent exceedances.
- NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas: 2 limits, 2 violations of any kind, 0 effluent exceedances.
- LOAEC Lethal Static Renewal 48HR Acute Daphnia pulex: 2 limits, 2 violations of any kind, 0 effluent exceedances.
- LOAEC Lethal Survival Static Renewal 48Hr Acute Pimephales promelas: 2 limits, 2 violations of any kind, 0 effluent exceedances.
- Chlorine, total residual: 0 limits, 2 violations of any kind, 0 effluent exceedances.
- Fecal coliform: 1 limit, 1 violation of any kind, 0 effluent exceedances.
- Polychlorinated biphenyls [PCBs]: 1 limit, 1 violation of any kind, 0 effluent exceedances.
- Toxicity characteristic leaching procedure: 1 limit, 1 violation of any kind, 0 effluent exceedances.
- Ann. amt sludge disposed by other method: 1 limit, 1 violation of any kind, 0 effluent exceedances.
- Annual amt of sludge incinerated: 1 limit, 1 violation of any kind, 0 effluent exceedances.
- Annual sludge production, total: 1 limit, 1 violation of any kind, 0 effluent exceedances.
- Annual amount of sludge land applied: 1 limit, 1 violation of any kind, 0 effluent exceedances.
- Annual amt. sludge disposed surface unit: 1 limit, 1 violation of any kind, 0 effluent exceedances.
- Annual amt sludge disposed in landfill: 1 limit, 1 violation of any kind, 0 effluent exceedances.
- Annual amt sludge transported interstate: 1 limit, 1 violation of any kind, 0 effluent exceedances.
- Unit w/liner/leachate collection system: 1 limit, 1 violation of any kind, 0 effluent exceedances.
- Compliance w/part 258 sludge requirement: 1 limit, 1 violation of any kind, 0 effluent exceedances.
- Boundary areas: 1 limit, 1 violation of any kind, 0 effluent exceedances.
- Salmonella: 1 limit, 1 violation of any kind, 0 effluent exceedances.
- Pollutant table from 503.13: 1 limit, 1 violation of any kind, 0 effluent exceedances.
- Annual whole sludge application rate: 1 limit, 0 violations of any kind, 0 effluent exceedances.
- LC50 Pass/Fail Static 24Hr Acute D. Pulex: 1 limit, 0 violations of any kind, 0 effluent exceedances.
- LC50 Pass/Fail Static 24Hr Acute Pimephales promelas: 1 limit, 0 violations of any kind, 0 effluent exceedances.
- May 5, 2026: State CWA Penalty AO (State), $74,750 state or local penalty.
- April 24, 2026: Permit Violations - Violation Specified in Comment (ST6).
- April 24, 2026: Evaluation (S).
- March 16, 2022: Permit Violations - Violation Specified in Comment (ST6).
Texas holds 1,720 Publicly owned treatment works coverages of this permit type in EPA’s file; 579 were issued before TX0124851.
Coverages issued nearest TX0124851
- September 11, 2017: FORT BEND COUNTY MUD NO 206 WWTP, City Of Houston, TX0133779, held by FORT BEND COUNTY MUD NO 206
- September 12, 2017: CITY OF KATY WWTP, Katy, TX0025747, held by KATY, CITY OF
- September 12, 2017: MONTGOMERY COUNTY MUD 18 WWTP, Montgomery County, TX0100331, held by MONTGOMERY COUNTY MUD 18
- September 12, 2017: CITY OF MIDWAY WWTP, Midway, TX0102849, held by MIDWAY, CITY OF
- September 12, 2017: CITY OF BLANCO WTP, Blanco, TX0137545, held by BLANCO, CITY OF
- September 14, 2017: FORT BEND COUNTY MUD 34 WWTP, Fort Bend County, TX0085448, held by FORT BEND COUNTY MUD 34
- September 14, 2017: SPLENDORA WWTP, Splendora, TX0102512, held by SPLENDORA, CITY OF
- September 14, 2017: FORT BEND COUNTY MUD 130 WWTF, Fort Bend County, TX0118109, held by FORT BEND COUNTY MUD 130
- September 18, 2017: CITY OF JACINTO CITY WWTP, Jacinto City, TX0053970, held by CITY OF JACINTO CITY
- September 18, 2017: WEST HARRIS COUNTY MUD 7 WWTP, Katy, TX0079618, held by WEST HARRIS COUNTY MUD 7
CINCO SOUTHWEST WWTP among its neighbors
EPA’s permit file holds 72 discharge permits in the Little Prong-Buffalo Bayou subwatershed (HUC 120401040103), TX0124851 among them. Its county holds 4,455, 195 of them major permits; TX0124851 is a major permit.
Other permits in the Little Prong-Buffalo Bayou subwatershed (HUC 120401040103)
- AMAZONCOM SERVICES HOU3, Katy: TXR05FE05, minor permit, permit term to August 13, 2026
- BOARDWALK DISTRICT TRAILS PHASE 3, Katy: TXR1570TS, minor permit, discharging to BUFFALO BAYOU/BARKER RESERVOIR, permit term to March 4, 2028
- CAVENDERS KATY, Caty: TXR1556VT, minor permit, discharging to UNNAMED TRIBUTARY OF BUFFALO BAYOU, permit term to March 4, 2028
- CEMEX BAYTOWN READY MIX PLANT, Baytown: TXG111782, minor permit, discharging to CEDAR BAYOR, permit term to November 7, 2021
- CINCO SOUTHWEST MUD 1 MS4, Houston: TXR040523, minor permit, discharging to LITTLE PRONG CREEK, permit term to January 23, 2024
- CINCO SOUTHWEST MUD 1 WWTP, Katy: TXR05EY30, minor permit, permit term to August 13, 2026
- CINCO SOUTHWEST MUD 2 MS4, Houston: TXR040525, minor permit, discharging to LITTLE PRONG CREEK, permit term to January 23, 2024
- CINCO SOUTHWEST MUD 3 MS4, Houston: TXR040524, minor permit, discharging to LITTLE PRONG CREEK, permit term to January 23, 2024
- CINCO SOUTHWEST MUD 4 MS4, Houston: TXR040526, minor permit, discharging to LITTLE PRONG CREEK, permit term to January 23, 2024
- FIRETHORNE OFFICE CENTER, Katy: TXR1522QP, minor permit, discharging to WILLOW FORK BUFFALO BAYOU, permit term to March 4, 2028
Identity
| Facility as filed | CINCO SOUTHWEST WWTP |
|---|---|
| Permittee as filed | CINCO SOUTHWEST MUD 1 |
| NPDES ID | TX0124851 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | September 13, 2017 |
| Expiration date | May 1, 2022 |
| Address | Katy, TX 77494 |
| Receiving water | DRAINAGE DITCH; LITTLE PRONG CK;BUFFALO BAYOU |
| Subwatershed | Little Prong-Buffalo Bayou (HUC 120401040103) |
Effluent limits and exceedances
- 51Pollutants on file
- 49Under a numeric limit
- 48With a violation of any kind
- 3With 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 |
|---|---|---|---|---|---|
| E. coli | 2 | 31 | 31 | March 31, 2026 | 99,999% over the limit |
| Nitrogen, ammonia total [as N] | 6 | 22 | 16 | July 31, 2024 | 765% over the limit |
| Oxygen, dissolved [DO] | 1 | 4 | 2 | March 31, 2020 | 7% over the limit |
| Flow, in conduit or thru treatment plant | 6 | 14 | 0 | ||
| BOD, carbonaceous [5 day, 20 C] | 6 | 13 | 0 | ||
| Solids, total suspended | 6 | 6 | 0 | ||
| Copper, total [as Cu] | 6 | 6 | 0 | ||
| Zinc, total [as Zn] | 6 | 6 | 0 | ||
| pH | 3 | 6 | 0 | ||
| Arsenic, dry weight | 5 | 5 | 0 | ||
| Chromium, sludge, total, dry weight [as Cr] | 5 | 5 | 0 | ||
| Coliform, fecal general | 0 | 4 | 0 | ||
| Selenium, dry weight | 3 | 3 | 0 | ||
| Copper, dry weight | 3 | 3 | 0 | ||
| Cadmium, dry weight | 3 | 3 | 0 | ||
| Molybdenum, sludge, total, dry weight [as Mo] | 3 | 3 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 3 | 3 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 3 | 3 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 3 | 3 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 3 | 3 | 0 | ||
| Whole effluent toxicity - retest #1 | 3 | 2 | 0 | ||
| Whole effluent toxicity - retest #2 | 3 | 2 | 0 | ||
| Nickel, total [as Ni] | 2 | 2 | 0 | ||
| Level of pathogen requirements achieved | 2 | 2 | 0 | ||
| Description of pathogen option used | 2 | 2 | 0 | ||
| Vector attraction reduction alternative used | 2 | 2 | 0 | ||
| Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex | 2 | 2 | 0 | ||
| LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas | 2 | 2 | 0 | ||
| NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex | 2 | 2 | 0 | ||
| NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas | 2 | 2 | 0 | ||
| LOAEC Lethal Static Renewal 48HR Acute Daphnia pulex | 2 | 2 | 0 | ||
| LOAEC Lethal Survival Static Renewal 48Hr Acute Pimephales promelas | 2 | 2 | 0 | ||
| Chlorine, total residual | 0 | 2 | 0 | ||
| Fecal coliform | 1 | 1 | 0 | ||
| Polychlorinated biphenyls [PCBs] | 1 | 1 | 0 | ||
| Toxicity characteristic leaching procedure | 1 | 1 | 0 | ||
| Ann. amt sludge disposed by other method | 1 | 1 | 0 | ||
| Annual amt of sludge incinerated | 1 | 1 | 0 | ||
| Annual sludge production, total | 1 | 1 | 0 | ||
| Annual amount of sludge land applied | 1 | 1 | 0 | ||
| Annual amt. sludge disposed surface unit | 1 | 1 | 0 | ||
| Annual amt sludge disposed in landfill | 1 | 1 | 0 | ||
| Annual amt sludge transported interstate | 1 | 1 | 0 | ||
| Unit w/liner/leachate collection system | 1 | 1 | 0 | ||
| Compliance w/part 258 sludge requirement | 1 | 1 | 0 | ||
| Boundary areas | 1 | 1 | 0 | ||
| Salmonella | 1 | 1 | 0 | ||
| Pollutant table from 503.13 | 1 | 1 | 0 | ||
| Annual whole sludge application rate | 1 | 0 | 0 | ||
| LC50 Pass/Fail Static 24Hr Acute D. Pulex | 1 | 0 | 0 | ||
| LC50 Pass/Fail Static 24Hr Acute Pimephales promelas | 1 | 0 | 0 |
Inspections, violations and enforcement
- 2Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| April 24, 2026 | Permit Violations - Violation Specified in Comment | ST6 |
| March 16, 2022 | Permit Violations - Violation Specified in Comment | ST6 |
Inspections
| Date | What EPA recorded | Agency |
|---|---|---|
| April 24, 2026 | Evaluation | S |
Formal enforcement and penalties
1 formal actions, 1 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.
| Date | What EPA recorded | Agency | Federal penalty | State or local penalty |
|---|---|---|---|---|
| May 5, 2026 | State CWA Penalty AO | State | $74,750 |
Informal enforcement
EPA’s informal enforcement file holds no action for NPDES TX0124851.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.