La Marque Water Hardness & Quality Report (2026)
Water Hardness
10.4 grains per gallon
Source
mixed
pH Level
8
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
420.1 mg/L
Est. Daily Cost
$0.48
energy & soap waste
Source: USGS Water Quality Portal · 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 24% efficiency due to mineral buildup.
| Appliance | In La Marque | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 3.7 yrs | 8.5 yrs | -56% |
| Washing Machine | 7 yrs | 12 yrs | -42% |
| Water Heater | 8.5 yrs | 15 yrs | -43% |
Regional Water Comparison
How La Marque compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ La Marque, Texas | 178.5 mg/L | 6.9 ppt | 🟠 Hard | mixed |
| Texas City, Texas | 342.5 mg/L | 10.3 ppt | 🔴 Very Hard | mixed |
| Dickinson, Texas | 207 mg/L | 7.5 ppt | 🔴 Very Hard | mixed |
| Santa Fe, Texas | 146 mg/L | 6.2 ppt | 🟠 Hard | mixed |
| League City, Texas | 417.5 mg/L | 11.9 ppt | 🔴 Very Hard | mixed |
National Benchmark
How La Marque compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ La Marque | 178.5 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes La Marque's Water Unique?
Local geology and source profile
La Marque, Texas, in Galveston County — a Galveston County city adjacent to Texas City and Galveston on Galveston Bay in the south Houston Gulf Coast — receives its municipal water from the Gulf Coast Water Authority, drawing from the Brazos River (Galveston County, the Gulf Coast Water Authority Canal system) through the south Texas coast treatment system.
The hard 178.5 mg/L hardness and elevated TDS of 420.1 mg/L reflect the south Texas Gulf Coast Brazos River supply's calcareous character — consistent with the Galveston County coastal water. The Gulf Coast Water Authority draws from the Brazos River (draining the South Texas Plains — Cretaceous Georgetown Formation limestone, Cretaceous Woodbine calcareous) and the Gulf Coastal Plain (Eocene Wilcox calcareous shale), with upstream Permian evaporitic redbed input contributing to the elevated TDS.
At 178.5 mg/L, La Marque's water is hard — scale builds steadily in kettles and appliances, dishwashers benefit from rinse aid, and water heaters should be descaled annually. Monthly descaling is recommended. The PFAS level of 6.9 ppt warrants a certified drinking water filter — the Galveston County south Texas petrochemical corridor (Texas City refinery and chemical complex — one of the most concentrated petrochemical industrial areas in the USA) and the Gulf Coast PFAS complex contribute to La Marque's elevated readings.
Geology & Source: La Marque in Galveston County draws from the Gulf Coast Water Authority on the Brazos River (Galveston County, south Texas coast) — the Brazos at the Gulf Coast drains the South Texas Plains (Cretaceous Georgetown limestone) and Permian evaporitic redbeds — Texas Galveston County Brazos River Gulf Coast calcareous watershed produces hard water at 178.5 mg/L with TDS 420.1 mg/L in this Galveston County Texas city.