Lockhart Water Hardness & Quality Report (2026)
Water Hardness
16.2 grains per gallon
Source
mixed
pH Level
8.5
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
740.5 mg/L
Est. Daily Cost
$0.74
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 Lockhart, your appliances are currently losing 37% efficiency due to mineral buildup.
| Appliance | In Lockhart | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 3.4 yrs | 12 yrs | -72% |
| Water Heater | 5 yrs | 15 yrs | -67% |
Regional Water Comparison
How Lockhart compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Lockhart, Texas | 277 mg/L | 8.9 ppt | 🔴 Very Hard | mixed |
| Kyle, Texas | 147.5 mg/L | 6.2 ppt | 🟠 Hard | mixed |
| Buda, Texas | 131 mg/L | 5.8 ppt | 🟠 Hard | mixed |
| San Marcos, Texas | 440 mg/L | 4.6 ppt | 🔴 Very Hard | mixed |
| Austin, Texas | 215 mg/L | 4.2 ppt | 🔴 Very Hard | reservoir |
National Benchmark
How Lockhart compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Lockhart | 277 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Lockhart's Water Unique?
Local geology and source profile
Lockhart, Texas, in Caldwell County — the Caldwell County seat adjacent to Luling and Kyle in south-central Texas — receives its water from the City of Lockhart Water, drawing from Plum Creek or local aquifer (Caldwell County) through the south-central Texas distribution.
The extremely hard 277 mg/L hardness and TDS of 740.5 mg/L make Lockhart one of the hardest water cities in this dataset — reflecting the south-central Texas Caldwell County supply's extreme calcareous character driven by the Cretaceous Austin Chalk and Eocene Wilcox aquifer formations that yield extreme calcium-magnesium dissolution, typical of the Edwards Plateau-Coastal Plain transition zone in south Texas where multiple calcareous aquifer systems stack. The Caldwell County supply — Cretaceous Austin Chalk (calcareous — primary hardness contributor), Eocene Wilcox Formation (slightly calcareous — secondary contributor), and Quaternary Texas alluvium (calcareous — TDS contributor).
At 277 mg/L with TDS 740, Lockhart's water is extremely hard. A water softener is essential to prevent severe scale damage to all appliances and plumbing. A reverse osmosis system is required for drinking water. The PFAS level of 8.9 ppt warrants a certified drinking water filter — the Caldwell County south-central Texas industrial corridor contribute to Lockhart's elevated readings.
Geology & Source: Lockhart in Caldwell County draws from the City of Lockhart Water on Plum Creek or local Carrizo-Wilcox aquifer (Caldwell County, south-central Texas) — the Carrizo-Wilcox at Caldwell County is developed in Eocene Wilcox Formation (slightly calcareous) over Cretaceous Austin Chalk (calcareous) — Texas Caldwell County Carrizo-Wilcox-Austin Chalk Eocene-Cretaceous calcareous aquifer produces extremely hard water at 277 mg/L with TDS 740.5 mg/L.