Southlake Water Hardness & Quality Report (2026)
Water Hardness
18 grains per gallon
Source
mixed
pH Level
8.5
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
854.2 mg/L
Est. Daily Cost
$0.82
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 Southlake, your appliances are currently losing 41% efficiency due to mineral buildup.
| Appliance | In Southlake | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 3 yrs | 12 yrs | -75% |
| Water Heater | 5 yrs | 15 yrs | -67% |
Regional Water Comparison
How Southlake compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Southlake, Texas | 308 mg/L | 9.6 ppt | 🔴 Very Hard | mixed |
| Grapevine, Texas | 302 mg/L | 9.5 ppt | 🔴 Very Hard | mixed |
| Colleyville, Texas | 418.5 mg/L | 11.9 ppt | 🔴 Very Hard | mixed |
| Flower Mound, Texas | 244.5 mg/L | 8.2 ppt | 🔴 Very Hard | mixed |
| Bedford, Texas | 183 mg/L | 6.9 ppt | 🔴 Very Hard | mixed |
National Benchmark
How Southlake compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Southlake | 308 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Southlake's Water Unique?
Local geology and source profile
Southlake, Texas, in Tarrant County — a major northeast Fort Worth–Dallas affluent suburban community (Southlake is one of the most affluent and prestigious communities in Texas — a Tarrant County city in the DFW Mid-Cities corridor known for its extremely high household incomes, trophy homes, and the famous Southlake Town Square (one of the most upscale mixed-use town center developments in the Dallas–Fort Worth metroplex — a New Urbanist pedestrian-scale retail and dining district that has become a regional destination)); Southlake is home of Carroll ISD (consistently ranked among the highest-performing school districts in Texas — Carroll's Dragon football program is one of the most celebrated in Texas high school athletics)), a diverse Tarrant County community with a primarily ultra-affluent technology executive, professional athlete, and old-money Texas oil family population, adjacent to Grapevine and Colleyville in the northeast Tarrant County corridor, and one of the most expensive ZIP codes in Texas — draws its municipal water supply from Lake Grapevine via the City of Southlake Water Division. Water hardness in Southlake measures 308 mg/L — classified as extremely hard.
Southlake's extremely hard supply reflects the north Texas Tarrant County Cretaceous limestone geology's highly calcareous character. The Denton Creek watershed (Lake Grapevine) draws from Cretaceous Woodbine Sandstone and Eagle Ford Formation (calcareous-moderate to highly calcareous). Very limited softening produces the extreme 308 mg/L.
At 308 mg/L, Southlake residents face severe hard water challenges. Water softeners and regular appliance descaling are essential. City of Southlake Water Division consistently delivers water meeting all Texas TCEQ and EPA Safe Drinking Water Act requirements.
Geology & Source: Reservoir supply from the Lake Grapevine (Denton Creek watershed) via the City of Southlake Water Division (TRA supply) — the Tarrant County northeast Fort Worth–Dallas suburban Southlake corridor (Cretaceous calcareous Woodbine Sandstone and Cretaceous calcareous Eagle Ford Formation — the extremely calcareous north Texas Tarrant County Cretaceous limey shale; very limited softening); extremely hard at 308 mg/L in Tarrant County.