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HARRIS COUNTY MUD 189

PWS ID: TX1011809 · HOUSTON, Texas 77010-3095

HARRIS COUNTY MUD 189 serves 6,906 people in HOUSTON, Texas using Groundwater water sources. It has 77 recorded EPA violations, including 20 health-based violations. PFAS "forever chemicals" were detected in UCMR5 testing (1 compound found).

Water Quality Snapshot: HARRIS COUNTY MUD 189

HARRIS COUNTY MUD 189 is a local-owned community water system that delivers drinking water to 6,906 residents in HOUSTON, Texas (Harris County) through 2,302 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 77 total violations for this system , of which 20 (26%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 42 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 12 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 14.7 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. HARRIS COUNTY MUD 189's 77 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
6,906
Total Violations
77
Health-Based Violations
20
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
2,302
County
Harris
School/Daycare
No
MCL Violations
20
Monitoring Violations
42
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Gross Alpha, Excl. Radon and U MCL 12 2014
Lead and Copper Rule MR 10 2015
Coliform (TCR) MCL 7 2005
Public Notice Other 7 2015
Coliform (TCR) MR 4 2004
Gross Alpha, Excl. Radon and U MR 4 2010
Combined Radium (-226 and -228) MR 4 2010
Combined Uranium MR 4 2010
Simazine MR 1 2019
Atrazine MR 1 2019
Endrin MR 1 2019
Toxaphene MR 1 2019
Combined Radium (-226 and -228) MCL 1 1984
Heptachlor epoxide MR 1 2019
Hexachlorocyclopentadiene MR 1 2019
HEXACHLOROBENZENE MR 1 2019
Heptachlor MR 1 2019
Chlordane MR 1 2019
BHC-GAMMA MR 1 2019
LASSO MR 1 2019
Di(2-ethylhexyl) adipate MR 1 2019
Pentachlorophenol MR 1 2019
Methoxychlor MR 1 2019
Benzo(a)pyrene MR 1 2019
Di(2-ethylhexyl) phthalate MR 1 2019

PFAS Testing Results (UCMR5)

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

Contaminant Date Result MRL Status
PFMBA 6/12/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 6/12/2024 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 6/12/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFPeS 6/12/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHpS 6/12/2024 <0.003 µg/L 0.003 µg/L Not Detected
ADONA 6/12/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 6/12/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOS 6/12/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 6/12/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 6/12/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBA 6/12/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 6/12/2024 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 6/12/2024 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 6/12/2024 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 6/12/2024 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 6/12/2024 <0.002 µg/L 0.002 µg/L Not Detected
4:2 FTS 6/12/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 6/12/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFDoA 6/12/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 6/12/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 6/12/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 6/12/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 6/12/2024 <0.003 µg/L 0.003 µg/L Not Detected
11Cl-PF3OUdS 6/12/2024 <0.005 µg/L 0.005 µg/L Not Detected
NEtFOSAA 6/12/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFTA 6/12/2024 <0.008 µg/L 0.008 µg/L Not Detected
NMeFOSAA 6/12/2024 <0.006 µg/L 0.006 µg/L Not Detected
PFTrDA 6/12/2024 <0.007 µg/L 0.007 µg/L Not Detected
PFNA 6/12/2024 <0.004 µg/L 0.004 µg/L Not Detected
lithium 6/12/2024 12.4000 µg/L 9 µg/L Detected
PFMPA 4/30/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 4/30/2025 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 4/30/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 4/30/2025 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 4/30/2025 <0.003 µg/L 0.003 µg/L Not Detected
ADONA 4/30/2025 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 4/30/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFTA 4/30/2025 <0.008 µg/L 0.008 µg/L Not Detected
PFTrDA 4/30/2025 <0.007 µg/L 0.007 µg/L Not Detected
NEtFOSAA 4/30/2025 <0.005 µg/L 0.005 µg/L Not Detected
NMeFOSAA 4/30/2025 <0.006 µg/L 0.006 µg/L Not Detected
HFPO-DA 4/30/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFPeA 4/30/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 4/30/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 4/30/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHpS 4/30/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 4/30/2025 <0.004 µg/L 0.004 µg/L Not Detected
NFDHA 4/30/2025 <0.02 µg/L 0.02 µg/L Not Detected
PFMBA 4/30/2025 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 4/30/2025 <0.002 µg/L 0.002 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 HARRIS COUNTY MUD 189.

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 TX1011809 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 HARRIS COUNTY MUD 189 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 Simazine MR 1 SDWIS / TX1011809 / 2037
2019 Atrazine MR 1 SDWIS / TX1011809 / 2050
2019 Endrin MR 1 SDWIS / TX1011809 / 2005
2019 Toxaphene MR 1 SDWIS / TX1011809 / 2020
2019 Heptachlor epoxide MR 1 SDWIS / TX1011809 / 2067
2019 Hexachlorocyclopentadiene MR 1 SDWIS / TX1011809 / 2042
2019 HEXACHLOROBENZENE MR 1 SDWIS / TX1011809 / 2274
2019 Heptachlor MR 1 SDWIS / TX1011809 / 2065
2019 Chlordane MR 1 SDWIS / TX1011809 / 2959
2019 BHC-GAMMA MR 1 SDWIS / TX1011809 / 2010
2019 LASSO MR 1 SDWIS / TX1011809 / 2051
2019 Di(2-ethylhexyl) adipate MR 1 SDWIS / TX1011809 / 2035
2019 Pentachlorophenol MR 1 SDWIS / TX1011809 / 2326
2019 Methoxychlor MR 1 SDWIS / TX1011809 / 2015
2019 Benzo(a)pyrene MR 1 SDWIS / TX1011809 / 2306

How HARRIS COUNTY MUD 189 Compares

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

Metric HARRIS COUNTY MUD 189 Texas avg Federal benchmark
Total violations 77 101.5 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 20 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 6,906 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 HARRIS COUNTY MUD 189 water safe to drink? ▼
HARRIS COUNTY MUD 189 (PWS ID: TX1011809) has 77 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 1 PFAS compound found. This system serves 6,906 people using Groundwater sources.
How many people does HARRIS COUNTY MUD 189 serve? ▼
HARRIS COUNTY MUD 189 serves 6,906 people in HOUSTON, Texas. It is a Local-owned system using Groundwater water sources with 2,302 service connections.
What type of violations does HARRIS COUNTY MUD 189 have? ▼
HARRIS COUNTY MUD 189 has 77 total violations: 20 health-based violations (MCL exceedances or treatment failures), 42 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in HARRIS COUNTY MUD 189 water? ▼
Yes. UCMR5 testing detected 1 PFAS compound in HARRIS COUNTY MUD 189's water supply: lithium. PFAS are persistent "forever chemicals" that do not break down in the environment.
What water source does HARRIS COUNTY MUD 189 use? ▼
HARRIS COUNTY MUD 189 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