Flower Mound Water Hardness & Quality Report (2026)
Water Hardness
14.3 grains per gallon
Source
mixed
pH Level
8.4
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
627.7 mg/L
Est. Daily Cost
$0.65
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 Flower Mound, your appliances are currently losing 33% efficiency due to mineral buildup.
| Appliance | In Flower Mound | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 4.6 yrs | 12 yrs | -62% |
| Water Heater | 5.8 yrs | 15 yrs | -61% |
Regional Water Comparison
How Flower Mound compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Flower Mound, Texas | 244.5 mg/L | 8.2 ppt | 🔴 Very Hard | mixed |
| Southlake, Texas | 308 mg/L | 9.6 ppt | 🔴 Very Hard | mixed |
| Grapevine, Texas | 302 mg/L | 9.5 ppt | 🔴 Very Hard | mixed |
| Highland Village, Texas | 373.5 mg/L | 11 ppt | 🔴 Very Hard | mixed |
| Coppell, Texas | 154.5 mg/L | 6.3 ppt | 🟠 Hard | mixed |
National Benchmark
How Flower Mound compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Flower Mound | 244.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Flower Mound's Water Unique?
Local geology and source profile
Flower Mound, Texas, in Denton County northwest of Dallas–Fort Worth — one of the most affluent communities in the DFW Metroplex, known for its large prairie land preserve — draws its municipal water supply from Lake Lewisville (the Corps of Engineers Elm Fork Trinity River reservoir in Denton–Lewisville) via the Upper Trinity Regional Water District and the Town of Flower Mound Water Division, distributing treated Lake Lewisville water through the Flower Mound distribution system. Water hardness in Flower Mound measures 244.5 mg/L — classified as very hard.
Flower Mound's very hard supply reflects the Elm Fork Trinity River watershed's exceptional Central Texas carbonate geology in the Dallas–Denton area. Lake Lewisville drains: the Cretaceous Austin Chalk (a major calcareous chalk formation underlying the DFW Metroplex — highly reactive calcium carbonate); the Cretaceous Eagle Ford Shale (calcareous dark shale — intermediate calcium contribution); the Cretaceous Taylor Marl (calcareous marl of the Blackland Prairie — significant dissolved calcium); and the Denton Clay and Woodbine Formation (calcareous Cretaceous units). The DFW Metroplex sits entirely on the Texas Blackland Prairie formed from Austin Chalk and Taylor Marl parent material — one of North America's most calcareous agricultural landscapes, producing very hard supply in all Trinity River watershed reservoirs.
At 244.5 mg/L, Flower Mound residents face significant hard water challenges. Scale deposits form rapidly on faucet aerators, showerheads, shower glass, and tile — monthly descaling with citric acid solution is essential maintenance. Dishwashers require rinse-aid. Upper Trinity Regional Water District consistently delivers water meeting all Texas TCEQ and EPA Safe Drinking Water Act requirements.
Geology & Source: Reservoir supply from Lake Lewisville (Elm Fork Trinity River) via the North Texas Municipal Water District (NTMWD) or Upper Trinity Regional Water District — the Elm Fork Trinity River Dallas–Denton County watershed draining the Cretaceous Eagle Ford Shale, Austin Chalk, and Taylor Marl; very hard supply at 244.5 mg/L in Denton County.