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WEST HARRIS COUNTY MUD 9

PWS ID: TX1011798 · HOUSTON, Texas 77057-1762

WEST HARRIS COUNTY MUD 9 serves 5,961 people in HOUSTON, Texas using Groundwater water sources. It has 30 recorded EPA violations, including 23 health-based violations. PFAS "forever chemicals" were detected in UCMR5 testing (1 compound found).

Water Quality Snapshot: WEST HARRIS COUNTY MUD 9

WEST HARRIS COUNTY MUD 9 is a local-owned community water system that delivers drinking water to 5,961 residents in HOUSTON, Texas (Harris County) through 1,973 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 30 total violations for this system , of which 23 (77%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 6 monitoring and reporting violations are on file. The most recent violation on record dates to 2019.

The most frequently cited contaminant at this system is Gross Alpha, Excl. Radon and U, recorded in 23 violations (MCL, health-based). Under EPA's UCMR5 PFAS monitoring program, 1 PFAS compound was detected in samples collected from this system, with a maximum reported concentration of 14.1 ppt. PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.

Across Texas, EPA tracks 7,351 public water systems serving 33,253,313 people, with 746,210 cumulative violations and 162,945 health-based violations on record. About 90% of systems in the state carry at least one violation, and state-wide the average per system is 101.5 violations. WEST HARRIS COUNTY MUD 9's 30 violations sit below the Texas average. Statewide, 1,068 of 1,147 UCMR5-tested systems have reported PFAS detections (93.1%). All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

PFAS Detected

1 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.

Population Served
5,961
Total Violations
30
Health-Based Violations
23
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
1,973
County
Harris
School/Daycare
No
MCL Violations
23
Monitoring Violations
6
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Gross Alpha, Excl. Radon and U MCL 23 2019
Coliform (TCR) MR 4 2010
Lead and Copper Rule MR 2 2013

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 2 of 60 samples detected PFAS.

Contaminant Date Result MRL Status
HFPO-DA 6/19/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 6/19/2023 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 6/19/2023 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 6/19/2023 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 6/19/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 6/19/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFHpS 6/19/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 6/19/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 6/19/2023 <0.004 µg/L 0.004 µg/L Not Detected
ADONA 6/19/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 6/19/2023 <0.004 µg/L 0.004 µg/L Not Detected
NMeFOSAA 6/19/2023 <0.006 µg/L 0.006 µg/L Not Detected
PFPeA 6/19/2023 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 6/19/2023 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 6/19/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 6/19/2023 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 6/19/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 6/19/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 6/19/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFOS 6/19/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 6/19/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 6/19/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 6/19/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFTA 6/19/2023 <0.008 µg/L 0.008 µg/L Not Detected
NFDHA 6/19/2023 <0.02 µg/L 0.02 µg/L Not Detected
PFOA 6/19/2023 <0.004 µg/L 0.004 µg/L Not Detected
lithium 6/19/2023 12.5000 µg/L 9 µg/L Detected
NEtFOSAA 6/19/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFMBA 6/19/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFTrDA 6/19/2023 <0.007 µg/L 0.007 µg/L Not Detected
NMeFOSAA 3/20/2024 <0.006 µg/L 0.006 µg/L Not Detected
PFTrDA 3/20/2024 <0.007 µg/L 0.007 µg/L Not Detected
NEtFOSAA 3/20/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFTA 3/20/2024 <0.008 µg/L 0.008 µg/L Not Detected
11Cl-PF3OUdS 12/13/2023 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 12/13/2023 <0.002 µg/L 0.002 µg/L Not Detected
ADONA 12/13/2023 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 12/13/2023 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 12/13/2023 <0.005 µg/L 0.005 µg/L Not Detected
8:2 FTS 12/13/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 12/13/2023 <0.002 µg/L 0.002 µg/L Not Detected
PFPeA 12/13/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFBA 12/13/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFMBA 12/13/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 12/13/2023 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 12/13/2023 <0.02 µg/L 0.02 µg/L Not Detected
PFPeS 12/13/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFMPA 12/13/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFHpA 12/13/2023 <0.003 µg/L 0.003 µg/L Not Detected
4:2 FTS 12/13/2023 <0.003 µg/L 0.003 µg/L Not Detected

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records — or to file a complaint, request a Consumer Confidence Report, or check current monitoring status — go directly to the federal and state regulators that enforce the Safe Drinking Water Act for WEST HARRIS COUNTY MUD 9.

Federal Source of Truth

EPA SDWIS — Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID TX1011798 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Texas Drinking Water Authority

Texas Commission on Environmental Quality (TCEQ) — Drinking Water Watch is the primacy agency that licenses and inspects WEST HARRIS COUNTY MUD 9 under EPA-delegated authority.

Open TX regulator portal

Source: Texas Commission on Environmental Quality (TCEQ) — Drinking Water Watch

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2019 Gross Alpha, Excl. Radon and U MCL 23 SDWIS / TX1011798 / 4000
2013 Lead and Copper Rule MR 2 SDWIS / TX1011798 / 5000
2010 Coliform (TCR) MR 4 SDWIS / TX1011798 / 3100

How WEST HARRIS COUNTY MUD 9 Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric WEST HARRIS COUNTY MUD 9 Texas avg Federal benchmark
Total violations 30 101.5 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 23 22.2 Indicates a contaminant exceeded a federal MCL
PFAS detection 1 compound 93.1% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 5,961 4,524 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 7,351 regulated public water systems in Texas.

Federal MCL reference — Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is WEST HARRIS COUNTY MUD 9 water safe to drink? ▼
WEST HARRIS COUNTY MUD 9 (PWS ID: TX1011798) has 30 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 1 PFAS compound found. This system serves 5,961 people using Groundwater sources.
How many people does WEST HARRIS COUNTY MUD 9 serve? ▼
WEST HARRIS COUNTY MUD 9 serves 5,961 people in HOUSTON, Texas. It is a Local-owned system using Groundwater water sources with 1,973 service connections.
What type of violations does WEST HARRIS COUNTY MUD 9 have? ▼
WEST HARRIS COUNTY MUD 9 has 30 total violations: 23 health-based violations (MCL exceedances or treatment failures), 6 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in WEST HARRIS COUNTY MUD 9 water? ▼
Yes. UCMR5 testing detected 1 PFAS compound in WEST HARRIS COUNTY MUD 9's water supply: lithium. PFAS are persistent "forever chemicals" that do not break down in the environment.
What water source does WEST HARRIS COUNTY MUD 9 use? ▼
WEST HARRIS COUNTY MUD 9 uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.

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Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.

Read our methodology — how this data is sourced, computed, and verified.

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Data sourced from $official public datasets. See our methodology for details. Retrieved and formatted by PlainWater Editorial