Bonham Water Hardness & Quality Report (2026)
Water Hardness
9.9 grains per gallon
Source
mixed
pH Level
8
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
392.5 mg/L
Est. Daily Cost
$0.45
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 Bonham, your appliances are currently losing 23% efficiency due to mineral buildup.
| Appliance | In Bonham | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4 yrs | 8.5 yrs | -53% |
| Washing Machine | 7.3 yrs | 12 yrs | -39% |
| Water Heater | 8.8 yrs | 15 yrs | -41% |
Regional Water Comparison
How Bonham compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Bonham, Texas | 169 mg/L | 6.6 ppt | 🟠 Hard | mixed |
| Denison, Texas | 168 mg/L | 6.6 ppt | 🟠 Hard | mixed |
| Sherman, Texas | 333 mg/L | 10.1 ppt | 🔴 Very Hard | mixed |
| Anna, Texas | 234 mg/L | 8 ppt | 🔴 Very Hard | mixed |
| Greenville, Texas | 373.5 mg/L | 11 ppt | 🔴 Very Hard | mixed |
National Benchmark
How Bonham compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Bonham | 169 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Bonham's Water Unique?
Local geology and source profile
Bonham, Texas, in Fannin County — the Fannin County seat adjacent to Sherman and McKinney in the northeast Texas Blackland Prairie — receives its water from the City of Bonham Water Department, drawing from Lake Bonham through the northeast Texas distribution.
The hard 169 mg/L hardness and TDS of 392.5 mg/L reflect the Fannin County supply's hard Cretaceous Blackland Prairie character — the Cretaceous Austin Chalk and Taylor Marl are calcareous formations in the northeast Texas Gulf Coastal Plain; Lake Bonham on Bois d'Arc Creek acquires substantial dissolved mineral content from its northeast Texas Blackland Prairie calcareous chalk and marl drainage (compare Sherman TX: 165/382 in Grayson County comparable; McKinney TX: 172/403 in Collin County comparable; Bonham consistent hard from the same Fannin County Lake Bonham Cretaceous calcareous supply). The Lake Bonham/Bois d'Arc Creek supply — Cretaceous Austin Chalk (calcareous — primary hardness contributor), Cretaceous Taylor Marl (calcareous — secondary contributor), and Quaternary northeast Texas alluvium (calcareous — TDS contributor).
At 169 mg/L with TDS 393, Bonham's water is hard — scale builds in appliances. Quarterly descaling is appropriate. The PFAS level of 6.6 ppt warrants a certified drinking water filter. Review the City of Bonham's annual water quality report.
Geology & Source: Bonham in Fannin County draws from the Bonham Water on the Bois d'Arc Creek/Lake Bonham supply (Fannin County, northeast Texas) — the northeast Texas Blackland Prairie at Fannin County draws from Cretaceous Austin Chalk (calcareous) and Cretaceous Taylor Marl (calcareous) — Texas Fannin County Lake Bonham Cretaceous calcareous supply produces hard water at 169 mg/L with TDS 392.5 mg/L.