Sherman Water Hardness & Quality Report (2026)
Water Hardness
19.5 grains per gallon
Source
mixed
pH Level
8.5
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
950.8 mg/L
Est. Daily Cost
$0.89
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 Sherman, your appliances are currently losing 44% efficiency due to mineral buildup.
| Appliance | In Sherman | 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 Sherman compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Sherman, Texas | 333 mg/L | 10.1 ppt | 🔴 Very Hard | mixed |
| Denison, Texas | 168 mg/L | 6.6 ppt | 🟠 Hard | mixed |
| Durant, Oklahoma | 373.5 mg/L | 6.4 ppt | 🔴 Very Hard | reservoir |
| McKinney, Texas | 320.5 mg/L | 9.8 ppt | 🔴 Very Hard | mixed |
| Prosper, Texas | 368.5 mg/L | 10.9 ppt | 🔴 Very Hard | mixed |
National Benchmark
How Sherman compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Sherman | 333 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Sherman's Water Unique?
Local geology and source profile
Sherman, Texas, the Grayson County seat — a major north Texas city on Lake Texoma at the Oklahoma border, the 'Gateway to Lake Texoma' (one of the largest reservoirs in the US, straddling the Texas–Oklahoma border on the Red River), home of Austin College (a liberal arts college, the oldest institution of higher learning in Texas operating under its original charter, founded 1849), and a rapidly growing Dallas metro north exurban community — draws its municipal water supply from Lake Texoma via the City of Sherman Water Division. Water hardness in Sherman measures 333 mg/L — classified as extremely hard.
Sherman's extremely hard supply reflects the Red River watershed's extreme calcareous geology. Lake Texoma on the Red River impounds water draining: the Arbuckle Mountains (Oklahoma — the highly calcareous Cambrian–Ordovician Arbuckle Group dolomite and limestone); the Anadarko Basin (highly calcareous Pennsylvanian calcareous limestone, Permian calcareous red beds and evaporites of Oklahoma and north Texas); the Cretaceous Austin Chalk and Taylor Marl of north Texas. The Red River's extremely calcareous multi-state watershed produces the extreme 333 mg/L at Sherman.
At 333 mg/L, Sherman residents face severe hard water challenges. Weekly descaling and appliance protection measures are strongly recommended. City of Sherman Water Division consistently delivers water meeting all Texas TCEQ and EPA Safe Drinking Water Act requirements.
Geology & Source: Surface water from the Lake Texoma (Red River watershed) via the North Texas Municipal Water District (NTMWD) and the City of Sherman Water Division — the Grayson County north Texas Red River border (Cretaceous Austin Chalk and Pennsylvanian calcareous limestone and shale of the north Texas Red River corridor); extremely hard supply at 333 mg/L — reflecting the Red River watershed's extreme calcareous geology.