Clean Water Act discharge permit · NPDES TX0058548
NORTHAMPTON MUD WWTP, Houston, TX: NPDES TX0058548 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 47Pollutants under a numeric limit
- 6Pollutants with an effluent exceedance
- 0Inspections on file
- 0Formal enforcement actions
NORTHAMPTON MUD WWTP, held by NORTHAMPTON MUD, holds NPDES permit TX0058548, which discharges to Willow Creek; Spring Creek. EPA’s file records it issued May 9, 2018 and expiring May 9, 2021.
NORTHAMPTON MUD WWTP, Houston, Texas: Individual permit TX0058548, held by NORTHAMPTON MUD; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued May 9, 2018, term to May 9, 2021; discharges to WILLOW CREEK; SPRING CREEK.
- E. coli: 2 limits, 21 violations of any kind, 20 effluent exceedances, latest October 31, 2025, largest 99,999% over the limit.
- Nitrogen, ammonia total [as N]: 3 limits, 76 violations of any kind, 16 effluent exceedances, latest May 31, 2024, largest 200% over the limit.
- Solids, total suspended: 3 limits, 64 violations of any kind, 7 effluent exceedances, latest September 30, 2010, largest 26% over the limit.
- BOD, carbonaceous [5 day, 20 C]: 3 limits, 64 violations of any kind, 4 effluent exceedances, latest July 31, 2013, largest 80% over the limit.
- Flow, in conduit or thru treatment plant: 4 limits, 44 violations of any kind, 2 effluent exceedances, latest May 31, 2016, largest 48,433% over the limit.
- Chlorine, total residual: 2 limits, 43 violations of any kind, 1 effluent exceedance, latest July 31, 2004, largest 1% over the limit.
- Silver, total [as Ag]: 0 limits, 64 violations of any kind, 0 effluent exceedances.
- pH: 3 limits, 45 violations of any kind, 0 effluent exceedances.
- Oxygen, dissolved [DO]: 1 limit, 21 violations of any kind, 0 effluent exceedances.
- Arsenic, dry weight: 5 limits, 9 violations of any kind, 0 effluent exceedances.
- Chromium, sludge, total, dry weight [as Cr]: 5 limits, 9 violations of any kind, 0 effluent exceedances.
- Nickel, total [as Ni]: 2 limits, 6 violations of any kind, 0 effluent exceedances.
- Level of pathogen requirements achieved: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Description of pathogen option used: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Vector attraction reduction alternative used: 2 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.
- Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia: 2 limits, 3 violations of any kind, 0 effluent exceedances.
- Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas: 2 limits, 3 violations of any kind, 0 effluent exceedances.
- NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia: 2 limits, 3 violations of any kind, 0 effluent exceedances.
- NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas: 2 limits, 3 violations of any kind, 0 effluent exceedances.
- NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia: 2 limits, 3 violations of any kind, 0 effluent exceedances.
- NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas: 2 limits, 3 violations of any kind, 0 effluent exceedances.
- Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia: 2 limits, 3 violations of any kind, 0 effluent exceedances.
- Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelas: 2 limits, 3 violations of any kind, 0 effluent exceedances.
- Unit w/liner/leachate collection system: 1 limit, 3 violations of any kind, 0 effluent exceedances.
- Boundary areas: 1 limit, 3 violations of any kind, 0 effluent exceedances.
- LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubia: 2 limits, 2 violations of any kind, 0 effluent exceedances.
- LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelas: 2 limits, 2 violations of any kind, 0 effluent exceedances.
- LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubia: 2 limits, 2 violations of any kind, 0 effluent exceedances.
- LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelas: 2 limits, 2 violations of any kind, 0 effluent exceedances.
- Whole Effluent Toxicity [WET] - P. promelas: 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.
- Annual whole sludge application rate: 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.
- 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.
- Ann. amt sludge disposed by other method: 0 limits, 1 violation of any kind, 0 effluent exceedances.
- Annual amt of sludge incinerated: 0 limits, 1 violation of any kind, 0 effluent exceedances.
- Annual sludge production, total: 0 limits, 1 violation of any kind, 0 effluent exceedances.
- Annual amount of sludge land applied: 0 limits, 1 violation of any kind, 0 effluent exceedances.
- Annual amt. sludge disposed surface unit: 0 limits, 1 violation of any kind, 0 effluent exceedances.
- Annual amt sludge disposed in landfill: 0 limits, 1 violation of any kind, 0 effluent exceedances.
- Annual amt sludge transported interstate: 0 limits, 1 violation of any kind, 0 effluent exceedances.
- Whole effluent toxicity - retest #1: 3 limits, 0 violations of any kind, 0 effluent exceedances.
- Whole effluent toxicity - retest #2: 3 limits, 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.
- September 24, 2025: Permit Violations - Violation Specified in Comment (ST6).
- June 8, 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; 766 were issued before TX0058548.
Coverages issued nearest TX0058548
- May 4, 2018: HARRIS COUNTY WCID NO 110 WWTP, Houston, TX0076481, held by HARRIS COUNTY WCID 110
- May 8, 2018: CITY OF DOMINO WWTP, Queen City, TX0136123, held by DOMINO, CITY OF
- May 9, 2018: HARRIS COUNTY WCID 74 WWTP, Houston, TX0023825, held by HARRIS COUNTY WCID 74
- May 9, 2018: REFUGIO COUNTY WCID 1 WWTP, Tivoli, TX0054101, held by REFUGIO COUNTY WCID 1
- May 9, 2018: HARRIS COUNTY MUD 26 WWTP, Humble, TX0056537, held by HARRIS COUNTY MUD 26
- May 9, 2018: HARRIS COUNTY MUD 58 WWTP, Houston, TX0074322, held by HARRIS COUNTY MUD 58
- May 9, 2018: CLOVER CREEK MUD WWTP, Magnolia Division, TX0097969, held by CLOVERCREEK MUD
- May 9, 2018: FAIRFIELD VILLAGE REGIONAL WWTP, Cypress, TX0105376, held by HARRIS COUNTY MUD 358
- May 9, 2018: NORTHWEST HARRIS COUNTY MUD 19 WWTP 2, Houston, TX0126152, held by NORTHWEST HARRIS COUNTY MUD 19
- May 9, 2018: MONTGOMERY COUNT MUD 137 WWTP, Magnolia, TX0134856, held by MONTGOMERY COUNTY MUD 137
NORTHAMPTON MUD WWTP among its neighbors
EPA’s permit file holds 137 discharge permits in the Willow Creek subwatershed (HUC 120401020210), TX0058548 among them. Its county holds 4,455, 195 of them major permits; TX0058548 is a major permit.
Other permits in the Willow Creek subwatershed (HUC 120401020210)
- 04868-1000 TOMBALL SAMS CLUB, Tomball: TXR1507VM, minor permit, discharging to WILLOW CREEK, permit term to March 4, 2028
- 04868-1000 TOMBALL SAMS CLUB, Tomball: TXR1563VQ, minor permit, discharging to WILLOW CREEK, permit term to March 4, 2028
- 501 MAPLE RIDGE WWTP, Houston: TX0127850, minor permit, discharging to DETENTION POND, WILLOW CREEK, SPRIN, permit term to March 1, 2010
- A-K 133 HWY 249-GRAND PKWY, Tomball: TXR1526RN, minor permit, discharging to WILLOW CREEK, permit term to March 4, 2028
- AMAZONCOM SERVICES DHX4, Spring: TXR05EZ42, minor permit, permit term to August 13, 2026
- AME TELGE BUSINESS PARK, Tomball: TXR1568PM, minor permit, discharging to WILLOW CREEK, permit term to March 4, 2028
- AME TELGE BUSINESS PARK PHASE II, Tomball: TXR1515WZ, minor permit, discharging to WILLOW CREEK, permit term to March 4, 2028
- AMIRA SEC 23, Tomball: TXR1503OP, minor permit, discharging to WILLOW CREEK, permit term to March 4, 2028
- AMIRA SECTION 22, Tomball: TXR1595OI, minor permit, discharging to TRIBUTARY OF LITTLE CYPRESS CREEK, permit term to March 4, 2028
- ASM - TOMBALL, Tomball: TXR1554XZ, minor permit, discharging to WILLOW CREEK, permit term to March 4, 2028
Identity
| Facility as filed | NORTHAMPTON MUD WWTP |
|---|---|
| Permittee as filed | NORTHAMPTON MUD |
| NPDES ID | TX0058548 |
| 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 | May 9, 2018 |
| Expiration date | May 9, 2021 |
| Address | Houston, TX 77074 |
| Receiving water | WILLOW CREEK; SPRING CREEK |
| Subwatershed | Willow Creek (HUC 120401020210) |
Effluent limits and exceedances
- 56Pollutants on file
- 47Under a numeric limit
- 52With 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 |
|---|---|---|---|---|---|
| E. coli | 2 | 21 | 20 | October 31, 2025 | 99,999% over the limit |
| Nitrogen, ammonia total [as N] | 3 | 76 | 16 | May 31, 2024 | 200% over the limit |
| Solids, total suspended | 3 | 64 | 7 | September 30, 2010 | 26% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 3 | 64 | 4 | July 31, 2013 | 80% over the limit |
| Flow, in conduit or thru treatment plant | 4 | 44 | 2 | May 31, 2016 | 48,433% over the limit |
| Chlorine, total residual | 2 | 43 | 1 | July 31, 2004 | 1% over the limit |
| Silver, total [as Ag] | 0 | 64 | 0 | ||
| pH | 3 | 45 | 0 | ||
| Oxygen, dissolved [DO] | 1 | 21 | 0 | ||
| Arsenic, dry weight | 5 | 9 | 0 | ||
| Chromium, sludge, total, dry weight [as Cr] | 5 | 9 | 0 | ||
| Nickel, total [as Ni] | 2 | 6 | 0 | ||
| Level of pathogen requirements achieved | 2 | 4 | 0 | ||
| Description of pathogen option used | 2 | 4 | 0 | ||
| Vector attraction reduction alternative used | 2 | 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 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 3 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | 2 | 3 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 3 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | 2 | 3 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 3 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 2 | 3 | 0 | ||
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 3 | 0 | ||
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelas | 2 | 3 | 0 | ||
| Unit w/liner/leachate collection system | 1 | 3 | 0 | ||
| Boundary areas | 1 | 3 | 0 | ||
| LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 2 | 0 | ||
| LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelas | 2 | 2 | 0 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 2 | 0 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelas | 2 | 2 | 0 | ||
| Whole Effluent Toxicity [WET] - P. promelas | 0 | 2 | 0 | ||
| Fecal coliform | 1 | 1 | 0 | ||
| Polychlorinated biphenyls [PCBs] | 1 | 1 | 0 | ||
| Toxicity characteristic leaching procedure | 1 | 1 | 0 | ||
| Annual whole sludge application rate | 1 | 1 | 0 | ||
| Compliance w/part 258 sludge requirement | 1 | 1 | 0 | ||
| Salmonella | 1 | 1 | 0 | ||
| Pollutant table from 503.13 | 1 | 1 | 0 | ||
| Ann. amt sludge disposed by other method | 0 | 1 | 0 | ||
| Annual amt of sludge incinerated | 0 | 1 | 0 | ||
| Annual sludge production, total | 0 | 1 | 0 | ||
| Annual amount of sludge land applied | 0 | 1 | 0 | ||
| Annual amt. sludge disposed surface unit | 0 | 1 | 0 | ||
| Annual amt sludge disposed in landfill | 0 | 1 | 0 | ||
| Annual amt sludge transported interstate | 0 | 1 | 0 | ||
| Whole effluent toxicity - retest #1 | 3 | 0 | 0 | ||
| Whole effluent toxicity - retest #2 | 3 | 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 |
|---|---|---|
| September 24, 2025 | Permit Violations - Violation Specified in Comment | ST6 |
| June 8, 2022 | Permit Violations - Violation Specified in Comment | ST6 |
Inspections
EPA’s inspection file holds no inspection for NPDES TX0058548.
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 TX0058548.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.