La Marque Water Hardness & Quality Report (2026)
Water Hardness
180+ mg/L
Very Hardestimated · not lab-verified
Source
reservoir
pH Level
8
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
420.1 mg/L
Est. Daily Cost
$0.91
energy & soap waste
Source: See methodology section below · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In La Marque, your appliances are currently losing 45% efficiency due to mineral buildup.
| Appliance | In La Marque | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4.7 yrs | 8.5 yrs | -45% |
| Washing Machine | 6.6 yrs | 12 yrs | -45% |
| Water Heater | 8.3 yrs | 15 yrs | -45% |
Regional Water Comparison
How La Marque compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ La Marque, Texas | ≈ 180+ mg/L | 149.6 ppt | 🔴 Very Hard | reservoir |
| Texas City, Texas | ≈ 180+ mg/L | 280.4 ppt | 🔴 Very Hard | reservoir |
| Dickinson, Texas | ≈ 180+ mg/L | 270.5 ppt | 🔴 Very Hard | reservoir |
| Santa Fe, Texas | ≈ 120–179 mg/L | 791 ppt | 🟠 Hard | reservoir |
| League City, Texas | ≈ 180+ mg/L | 316.8 ppt | 🔴 Very Hard | reservoir |
National Benchmark
How La Marque compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ La Marque | ≈ 180+ mg/L | 🔴 High |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
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What Makes La Marque's Water Unique?
Local geology and source profile
The City of La Marque Utilities delivers drinking water to about 18,000 residents in La Marque, Texas, situated in Galveston County. The city purchases its water, which originates from surface water sources influenced by the Texas Gulf Coast, including Galveston Bay and nearby bayous such as Highland Bayou. This water is likely treated at regional facilities before entering the city’s distribution system. Residents can find detailed information, including annual Consumer Confidence Reports, on the official city website, cityoflamarque.gov. For regulatory matters, inquiries can be directed to (281) 367-5511.
Geologically, La Marque sits atop the Gulf Coast Aquifer system. The water supply here interacts with limestone-dominated formations from the Tertiary period, including sands and clays of the Jackson Group. This interaction causes the dissolution of calcium and magnesium-bearing minerals, which is why the water is characteristically hard. This elevated mineral content is typical for water supplies found in the coastal regions of Texas.
Homeowners in La Marque often notice significant scale buildup in pipes, water heaters, dishwashers, and washing machines, which can reduce appliance efficiency and shorten their lifespan. You'll also find that soap doesn't lather well, and spots may appear on dishes after washing. Skin can feel dry after bathing due to the water's mineral content. To combat these issues, homeowners frequently descale appliances quarterly and consider installing a whole-home water softener. Using point-of-use filters for drinking water is also a common practice.
Geology & Source: Texas Gulf Coast coastal plain; Quaternary alluvial sediments, Tertiary formations like Beaumont Clay and Lagarto Claystone; Gulf Coast Aquifer limestone-rich layers contribute high calcium and magnesium for hard water
Other Texas Water Reports
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Frequently Asked Questions
Is La Marque's water safe to drink?
Do I need a water softener in La Marque?
How does La Marque compare to the USA average?
Data Sources & Methodology
Water quality data for La Marque is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.
Water Hardness
Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.
pH
Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.
TDS — Total Dissolved Solids
Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.
PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances
EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.
Lead
Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.
Appliance Lifespan
Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.