Winston-Salem Water Hardness & Quality Report (2026)
Water Hardness
4.1 grains per gallon
Source
reservoir
pH Level
7.4
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
111.1 mg/L
Est. Daily Cost
$0.19
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 Winston-Salem, your appliances are currently losing 9% efficiency due to mineral buildup.
| Appliance | In Winston-Salem | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.3 yrs | 8.5 yrs | -14% |
| Washing Machine | 11 yrs | 12 yrs | -8% |
| Water Heater | 12.8 yrs | 15 yrs | -15% |
Regional Water Comparison
How Winston-Salem compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Winston-Salem, North Carolina | 70 mg/L | 3.8 ppt | 🟡 Moderately Hard | reservoir |
| Clemmons, North Carolina | 74.5 mg/L | 4 ppt | 🟡 Moderately Hard | reservoir |
| Kernersville, North Carolina | 88 mg/L | 4.7 ppt | 🟡 Moderately Hard | reservoir |
| Lewisville, North Carolina | 155 mg/L | 8.2 ppt | 🟠 Hard | reservoir |
| Thomasville, North Carolina | 91.5 mg/L | 4.9 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Winston-Salem compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Winston-Salem | 70 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Winston-Salem's Water Unique?
Local geology and source profile
Winston-Salem's water is supplied by the City of Winston-Salem Utilities Division, drawing from two primary reservoir sources in the Piedmont foothills west and south of the city. Salem Lake — a reservoir on Salem Creek within the city — and Reservoir No. 1 (Swann Lake) on Peters Creek provide the combined supply treated at the Glenn E. Miller Water Treatment Plant. Winston-Salem also maintains emergency interconnections with Forsyth County and participates in regional water sharing agreements with High Point and Burlington utilities in the Piedmont Triad region. The Yadkin River basin, which drains the Winston-Salem area, eventually flows into the W. Kerr Scott Reservoir and High Rock Lake farther downstream — a different watershed system than the city's direct supply sources.
Winston-Salem's soft water at 70 mg/L reflects the felsic metamorphic geology of its Piedmont reservoir watersheds. Salem Creek and Peters Creek drain through the North Carolina Piedmont metamorphic zone — dominated by the Carolina Slate Belt felsic volcanic and metavolcanic rocks (meta-rhyolite, phyllite, felsic tuff) and Piedmont biotite gneiss and amphibolite — with minimal carbonate rock exposures. These silica-rich, calcium-poor metamorphic and volcanic rocks weather slowly and contribute very little calcium or magnesium carbonate to reservoir water, producing naturally soft conditions comparable to the softest Appalachian Piedmont cities. Winston-Salem's water is among the softest in North Carolina.
Winston-Salem residents enjoy genuinely soft water. Soap and shampoo lather abundantly, appliances stay free from limescale for extended periods, and glassware from dishwashers needs little to no rinse-aid for spot-free results. No water softener is needed. Descaling coffee makers and kettles twice yearly at most is all that is required. The primary water quality consideration is seasonal taste variation from algae events on Salem Lake, for which a carbon-block kitchen filter provides consistent improvement year-round and is the most useful household water upgrade for Winston-Salem residents.
Geology & Source: Salem Lake and Reservoir No. 1 on Salem Creek over Piedmont metamorphic gneiss and Carolina Slate Belt metavolcanics — relatively soft crystalline Piedmont reservoir supply