Rockwall Water Hardness & Quality Report (2026)
Water Hardness
21.5 grains per gallon
Source
mixed
pH Level
8.5
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
1090 mg/L
Est. Daily Cost
$0.98
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 Rockwall, your appliances are currently losing 45% efficiency due to mineral buildup.
| Appliance | In Rockwall | 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 Rockwall compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Rockwall, Texas | 367.5 mg/L | 10.8 ppt | 🔴 Very Hard | mixed |
| Rowlett, Texas | 110.5 mg/L | 5.4 ppt | 🟡 Moderately Hard | mixed |
| Wylie, Texas | 256.5 mg/L | 8.5 ppt | 🔴 Very Hard | mixed |
| Sachse, Texas | 163.5 mg/L | 6.5 ppt | 🟠 Hard | mixed |
| Murphy, Texas | 428 mg/L | 12.1 ppt | 🔴 Very Hard | mixed |
National Benchmark
How Rockwall compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Rockwall | 367.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Rockwall's Water Unique?
Local geology and source profile
Rockwall, Texas, the Rockwall County seat — the county seat of the smallest county by area in Texas, a rapidly growing exurban Dallas community on Lake Ray Hubbard, one of the fastest-growing Dallas suburbs, a major east Dallas lakefront residential community known for the Rockwall marina, Harbor District, and exceptional Lake Ray Hubbard waterfront — draws its municipal water supply from Lake Ray Hubbard via the North Texas Municipal Water District (NTMWD). Water hardness in Rockwall measures 367.5 mg/L — classified as extremely hard.
Rockwall's extremely hard supply reflects the northeast Dallas Trinity River corridor's highly calcareous Austin Chalk geology. Lake Ray Hubbard and the East Fork Trinity River watershed drain through: the Cretaceous Austin Chalk (one of the most calcareous geological formations in the Dallas–Fort Worth region, pure marine chalk — essentially calcium carbonate); the Cretaceous Eagle Ford Shale (calcareous calcareous marl and shale); and the Taylor Marl (calcareous marl formation). The pure Austin Chalk's exceptional calcareous dissolution in the NTMWD watershed produces the extremely hard 367.5 mg/L at Rockwall.
At 367.5 mg/L, Rockwall residents face severe hard water challenges. Scale deposits form very rapidly on all fixtures and appliances — weekly descaling and appliance protection measures are strongly recommended. NTMWD consistently delivers water meeting all Texas TCEQ and EPA Safe Drinking Water Act requirements.
Geology & Source: Surface water from the Lake Ray Hubbard (East Fork Trinity River watershed) via the North Texas Municipal Water District (NTMWD) and the City of Rockwall Water Division — the Rockwall County northeast Dallas exurban Trinity River corridor (Cretaceous Austin Chalk and Eagle Ford Shale calcareous terrain); very hard supply at 367.5 mg/L — reflecting the NTMWD Austin Chalk watershed's extreme calcareous geology.