NPDES TX0025747 · Clean Water Act
CITY OF KATY WWTP, Katy, TX: NPDES TX0025747 discharge permit, effluent exceedances, inspections, penalties
CITY OF KATY WWTP, Katy, Texas: Individual permit TX0025747, held by KATY, CITY OF; Publicly owned treatment works; Administratively continued; issued September 12, 2017, term to May 1, 2022; discharges to CANE ISLAND BRANCH, UNCLASSIFIED PO.
15 of the 54 pollutants listed for NPDES TX0025747 have no violation or effluent exceedance.
- E. coli: 2 limits, 2 violations of any kind, 2 effluent exceedances, latest August 31, 2025, largest 460% over the limit.
- Solids, total suspended: 3 limits, 1 violation of any kind, 1 effluent exceedance, latest April 30, 2013, largest 43% over the limit.
- Oxygen, dissolved [DO]: 1 limit, 1 violation of any kind, 1 effluent exceedance, latest November 30, 2025, largest 5% over the limit.
- Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas: 4 limits, 10 violations of any kind.
- NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas: 4 limits, 10 violations of any kind.
- NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas: 4 limits, 10 violations of any kind.
- Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia: 4 limits, 8 violations of any kind.
- Chromium, sludge, total, dry weight [as Cr]: 5 limits, 6 violations of any kind.
- NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia: 4 limits, 6 violations of any kind.
- NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia: 4 limits, 6 violations of any kind.
- Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelas: 4 limits, 6 violations of any kind.
- LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelas: 4 limits, 6 violations of any kind.
- LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelas: 4 limits, 6 violations of any kind.
- Lead, sludge, total, dry weight [as Pb]: 3 limits, 4 violations of any kind.
- Nickel, sludge, total, dry weight [as Ni]: 3 limits, 4 violations of any kind.
- Mercury, sludge, total, dry weight [as Hg]: 3 limits, 4 violations of any kind.
- Whole effluent toxicity - retest #2: 7 limits, 2 violations of any kind.
- Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia: 4 limits, 2 violations of any kind.
- LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubia: 4 limits, 2 violations of any kind.
- LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubia: 4 limits, 2 violations of any kind.
- Molybdenum, sludge, total, dry weight [as Mo]: 3 limits, 2 violations of any kind.
- Zinc, sludge, total, dry weight [as Zn]: 3 limits, 2 violations of any kind.
- Level of pathogen requirements achieved: 2 limits, 2 violations of any kind.
- Description of pathogen option used: 2 limits, 2 violations of any kind.
- Annual amount of sludge land applied: 1 limit, 2 violations of any kind.
- Annual amt sludge transported interstate: 1 limit, 2 violations of any kind.
- Pollutant table from 503.13: 1 limit, 2 violations of any kind.
- Arsenic, dry weight: 5 limits, 1 violation of any kind.
- Selenium, dry weight: 3 limits, 1 violation of any kind.
- Copper, dry weight: 3 limits, 1 violation of any kind.
- Cadmium, dry weight: 3 limits, 1 violation of any kind.
- Chlorine, total residual: 2 limits, 1 violation of any kind.
- Vector attraction reduction alternative used: 2 limits, 1 violation of any kind.
- Polychlorinated biphenyls [PCBs]: 1 limit, 1 violation of any kind.
- Toxicity characteristic leaching procedure: 1 limit, 1 violation of any kind.
- Annual amt of sludge incinerated: 1 limit, 1 violation of any kind.
- Annual sludge production, total: 1 limit, 1 violation of any kind.
- Annual amt. sludge disposed surface unit: 1 limit, 1 violation of any kind.
- Annual amt sludge disposed in landfill: 1 limit, 1 violation of any kind.
- Whole effluent toxicity - retest #1: 7 limits.
- Flow, in conduit or thru treatment plant: 4 limits.
- pH: 3 limits.
- Nitrogen, ammonia total [as N]: 3 limits.
- BOD, carbonaceous [5 day, 20 C]: 3 limits.
- Nickel, total [as Ni]: 2 limits.
- Fecal coliform: 1 limit.
- Annual whole sludge application rate: 1 limit.
- Ann. amt sludge disposed by other method: 1 limit.
- Unit w/liner/leachate collection system: 1 limit.
- Compliance w/part 258 sludge requirement: 1 limit.
- Boundary areas: 1 limit.
- Salmonella: 1 limit.
- LC50 Pass/Fail Static 24Hr Acute D. Pulex: 1 limit.
- LC50 Pass/Fail Static 24Hr Acute Pimephales promelas: 1 limit.
- September 12, 2025: Permit Violations - Violation Specified in Comment (ST6).
- June 26, 2024: Permit Violations - Violation Specified in Comment (ST6).
- April 20, 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; 575 were issued before TX0025747. KATY, CITY OF holds 2 permits in Texas.
Other permits held by KATY, CITY OF
- CITY OF KATY MS4 PUBLIC WORKS, Katy: TXR040009, issued 2009-06-02
Coverages issued nearest TX0025747
- 2017-09-08: HARRIS COUNTY MUD 276 WWTP, Houston: TX0095532, held by HARRIS COUNTY MUD 276
- 2017-09-11: MEADOWS PLACE WWTP, Fort Bend County: TX0053872, held by CITY OF MEADOWS PLACE
- 2017-09-11: BISSONETT MUD WWTP, Houston: TX0056952, held by BISSONNET MUD
- 2017-09-11: LUMBERTON MUD WWTP 2, Lumberton: TX0092801, held by LUMBERTON MUD
- 2017-09-11: FORT BEND COUNTY MUD NO 206 WWTP, City Of Houston: TX0133779, held by FORT BEND COUNTY MUD NO 206
- 2017-09-12: MONTGOMERY COUNTY MUD 18 WWTP, Montgomery County: TX0100331, held by MONTGOMERY COUNTY MUD 18
- 2017-09-12: CITY OF MIDWAY WWTP, Midway: TX0102849, held by MIDWAY, CITY OF
- 2017-09-12: CITY OF BLANCO WTP, Blanco: TX0137545, held by BLANCO, CITY OF
- 2017-09-13: CINCO SOUTHWEST WWTP, Katy: TX0124851, held by CINCO SOUTHWEST MUD 1
- 2017-09-14: FORT BEND COUNTY MUD 34 WWTP, Fort Bend County: TX0085448, held by FORT BEND COUNTY MUD 34
CITY OF KATY WWTP among its neighbors
61 discharge permits are in the Cane Island Branch subwatershed (HUC 120401040102); TX0025747 is one. Its county: 1,100, 41 major; TX0025747 is major permit.
Other permits in the Cane Island Branch subwatershed (HUC 120401040102)
- BAY CITY REGIONAL AIRPORT, Bay City: TXR1595XA, minor, term to 2028-03-04
- CANE ISLAND, Katy: TXR1579QP, minor, term to 2028-03-04
- CANE ISLAND SECTION 25, Katy: TXR15114J, minor, term to 2023-03-05
- CANE ISLAND SECTION FORTY ONE, Katy: TXR15001V, minor, term to 2023-03-04
- CASTLEROCK COMMUNITIES- RESERVE OF CHAMPIONS ESTATES, Mount Belvieu: TXR1522VL, minor, term to 2028-03-04
- CHRISTIAN BROTHERS - TRAINING FACILITY, Katy: TXR1555XV, minor, term to 2028-03-04
- CITY OF KATY MS4, Katy Mills: TXR040659, minor, term to 2024-01-24
- CONCRETE BATCH PLANT 6, Katy: TXG110344, minor, term to 2011-11-07
- DXP ENTERPRISES, Katy: TXR05FJ47, minor, term to 2026-08-13
- EAST WALLER COUNTY MANAGEMENT DISTRICT, Katy: TX0145408, minor, term to 2029-09-30
Identity
| Facility | CITY OF KATY WWTP |
|---|---|
| Permittee | KATY, CITY OF |
| NPDES ID | TX0025747 |
| Status | Administratively continued |
| Type | Individual permit |
| Class | Major |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | September 12, 2017 |
| Expires | May 1, 2022 |
| Address | Katy, TX 77494 |
| Receiving water | CANE ISLAND BRANCH, UNCLASSIFIED PO |
| Subwatershed | Cane Island Branch (HUC 120401040102) |
NPDES TX0025747: effluent limits and exceedances
CITY OF KATY WWTP (NPDES TX0025747): 54 pollutants on file, 54 limited; 39 with a violation of any kind, 3 with an exceedance.
| Pollutant | Limits | Violations | Exceedances | Latest | Largest, as filed |
|---|---|---|---|---|---|
| E. coli | 2 | 2 | 2 | August 31, 2025 | 460% over the limit |
| Solids, total suspended | 3 | 1 | 1 | April 30, 2013 | 43% over the limit |
| Oxygen, dissolved [DO] | 1 | 1 | 1 | November 30, 2025 | 5% over the limit |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | 4 | 10 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | 4 | 10 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 4 | 10 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 4 | 8 | 0 | ||
| Chromium, sludge, total, dry weight [as Cr] | 5 | 6 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 4 | 6 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 4 | 6 | 0 | ||
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelas | 4 | 6 | 0 | ||
| LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelas | 4 | 6 | 0 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelas | 4 | 6 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 3 | 4 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 3 | 4 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 3 | 4 | 0 | ||
| Whole effluent toxicity - retest #2 | 7 | 2 | 0 | ||
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 4 | 2 | 0 | ||
| LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubia | 4 | 2 | 0 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubia | 4 | 2 | 0 | ||
| Molybdenum, sludge, total, dry weight [as Mo] | 3 | 2 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 3 | 2 | 0 | ||
| Level of pathogen requirements achieved | 2 | 2 | 0 | ||
| Description of pathogen option used | 2 | 2 | 0 | ||
| Annual amount of sludge land applied | 1 | 2 | 0 | ||
| Annual amt sludge transported interstate | 1 | 2 | 0 | ||
| Pollutant table from 503.13 | 1 | 2 | 0 | ||
| Arsenic, dry weight | 5 | 1 | 0 | ||
| Selenium, dry weight | 3 | 1 | 0 | ||
| Copper, dry weight | 3 | 1 | 0 | ||
| Cadmium, dry weight | 3 | 1 | 0 | ||
| Chlorine, total residual | 2 | 1 | 0 | ||
| Vector attraction reduction alternative used | 2 | 1 | 0 | ||
| Polychlorinated biphenyls [PCBs] | 1 | 1 | 0 | ||
| Toxicity characteristic leaching procedure | 1 | 1 | 0 | ||
| Annual amt of sludge incinerated | 1 | 1 | 0 | ||
| Annual sludge production, total | 1 | 1 | 0 | ||
| Annual amt. sludge disposed surface unit | 1 | 1 | 0 | ||
| Annual amt sludge disposed in landfill | 1 | 1 | 0 | ||
| Whole effluent toxicity - retest #1 | 7 | 0 | 0 | ||
| Flow, in conduit or thru treatment plant | 4 | 0 | 0 | ||
| pH | 3 | 0 | 0 | ||
| Nitrogen, ammonia total [as N] | 3 | 0 | 0 | ||
| BOD, carbonaceous [5 day, 20 C] | 3 | 0 | 0 | ||
| Nickel, total [as Ni] | 2 | 0 | 0 | ||
| Fecal coliform | 1 | 0 | 0 | ||
| Annual whole sludge application rate | 1 | 0 | 0 | ||
| Ann. amt sludge disposed by other method | 1 | 0 | 0 | ||
| Unit w/liner/leachate collection system | 1 | 0 | 0 | ||
| Compliance w/part 258 sludge requirement | 1 | 0 | 0 | ||
| Boundary areas | 1 | 0 | 0 | ||
| Salmonella | 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 |
NPDES TX0025747: inspections, violations and enforcement
NPDES TX0025747: 3 single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| September 12, 2025 | Permit Violations - Violation Specified in Comment | ST6 |
| June 26, 2024 | Permit Violations - Violation Specified in Comment | ST6 |
| April 20, 2022 | Permit Violations - Violation Specified in Comment | ST6 |
NPDES TX0025747 (CITY OF KATY WWTP): no inspection, formal enforcement action and informal enforcement action on file.
Watch NPDES TX0025747
NPDES TX0025747: one email when its EPA record changes — $99/month.
Permits near NPDES TX0025747
NPDES TX0025747: 54 pollutant rows, 3 dated events; ICIS-NPDES download, loaded September 15, 2026.