Siloam Springs Water Hardness & Quality Report (2026)
Water Hardness
5.9 grains per gallon
Source
river
pH Level
7.6
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
183.2 mg/L
Est. Daily Cost
$0.27
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 Siloam Springs, your appliances are currently losing 13% efficiency due to mineral buildup.
| Appliance | In Siloam Springs | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.3 yrs | 8.5 yrs | -26% |
| Washing Machine | 9.9 yrs | 12 yrs | -17% |
| Water Heater | 11.6 yrs | 15 yrs | -23% |
Regional Water Comparison
How Siloam Springs compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Siloam Springs, Arkansas | 101 mg/L | 3.6 ppt | 🟡 Moderately Hard | river |
| Bentonville, Arkansas | 193.5 mg/L | 5.4 ppt | 🔴 Very Hard | river |
| Bella Vista, Arkansas | 181 mg/L | 5.1 ppt | 🔴 Very Hard | river |
| Fayetteville, Arkansas | 102 mg/L | 3.6 ppt | 🟡 Moderately Hard | river |
| Springdale, Arkansas | 182.5 mg/L | 5.1 ppt | 🔴 Very Hard | river |
National Benchmark
How Siloam Springs compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Siloam Springs | 101 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Siloam Springs's Water Unique?
Local geology and source profile
Siloam Springs, Arkansas, in Benton County — a Benton County city adjacent to Bentonville and Gentry on the Illinois River in the northwest Arkansas Ozarks — receives its municipal water from the Siloam Springs Water Division, drawing from the Illinois River (Benton County) through the Siloam Springs treatment plant.
The moderately hard 101 mg/L hardness and TDS of 183.2 mg/L reflect the northwest Arkansas Ozark Plateau's moderate carbonate character. The Illinois River at Benton County drains the Ozark Plateau — Mississippian Boone Limestone (the dominant Ozark carbonate platform — high purity chert and limestone), Ordovician Cotter Dolomite (calcareous), and Ordovician Gasconade Dolomite (calcareous). The moderately calcareous Ozark carbonate platform produces the moderately hard northwest Arkansas supply.
At 101 mg/L, Siloam Springs' water is moderately hard — scale builds in kettles and appliances over months, dishwashers benefit from rinse aid, and faucet aerators need periodic cleaning. Quarterly descaling is appropriate. The PFAS level of 3.6 ppt is low — the Benton County northwest Arkansas agricultural and distribution hub (Walmart Bentonville vicinity) has limited major AFFF military sources, and the Illinois River Ozark headwaters are relatively pristine.
Geology & Source: Siloam Springs in Benton County draws from the Siloam Springs Water Division on the Illinois River (Benton County, northwest Arkansas) — the Illinois River drains the Ozark Plateau (Mississippian Boone Limestone, Ordovician Cotter Dolomite — moderately calcareous) — Arkansas Benton County Illinois River Ozark calcareous watershed produces moderately hard water at 101 mg/L with TDS 183.2 mg/L in this Benton County Arkansas city.