Seven Oaks Water Hardness & Quality Report (2026)
Water Hardness
4.4 grains per gallon
Source
reservoir
pH Level
7.5
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
128.4 mg/L
Est. Daily Cost
$0.20
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 Seven Oaks, your appliances are currently losing 10% efficiency due to mineral buildup.
| Appliance | In Seven Oaks | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.1 yrs | 8.5 yrs | -16% |
| Washing Machine | 10.8 yrs | 12 yrs | -10% |
| Water Heater | 12.6 yrs | 15 yrs | -16% |
Regional Water Comparison
How Seven Oaks compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Seven Oaks, South Carolina | 74.5 mg/L | 4.2 ppt | 🟡 Moderately Hard | reservoir |
| Saint Andrews, South Carolina | 110 mg/L | 6.1 ppt | 🟡 Moderately Hard | reservoir |
| West Columbia, South Carolina | 75 mg/L | 4.2 ppt | 🟡 Moderately Hard | reservoir |
| Cayce, South Carolina | 140.5 mg/L | 7.8 ppt | 🟠 Hard | reservoir |
| Lexington, South Carolina | 72.5 mg/L | 4 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Seven Oaks compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Seven Oaks | 74.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Seven Oaks's Water Unique?
Local geology and source profile
Seven Oaks, South Carolina, in Lexington County — an unincorporated Lexington County community adjacent to Irmo and Lexington on Lake Murray in the Columbia metro of central South Carolina — receives its water from Lexington County Public Works or local utilities, drawing from Lake Murray (Saluda River, Lexington County) through the central South Carolina distribution.
The moderately soft 74.5 mg/L hardness and TDS of 128.4 mg/L reflect the central South Carolina Lake Murray Piedmont watershed's predominantly insoluble crystalline character — consistent with other Lake Murray-served communities (Irmo: ~75 mg/L; Lexington: ~73 mg/L). Lake Murray (Saluda River) at Lexington County drains the South Carolina Piedmont — Precambrian Batesburg Granite (insoluble), Precambrian Carolina Slate Belt (slightly calcareous phyllite — minor hardness contributor), and Cambrian Toccoa Formation (slightly calcareous). The predominantly insoluble Piedmont crystalline basement produces the moderately soft central South Carolina supply.
At 74.5 mg/L, Seven Oaks' water is moderately soft — light scale forms slowly in appliances, dishwashers remain efficient, and bathroom fixtures need occasional cleaning. Semi-annual descaling is appropriate. The PFAS level of 4.2 ppt warrants a certified drinking water filter — the Lexington County central South Carolina Columbia metro industrial corridor and the Shaw Air Force Base (Sumter County — AFFF) PFAS background with Saluda watershed influence contribute to Seven Oaks' readings.
Geology & Source: Seven Oaks in Lexington County draws from Lexington County Public Works on Lake Murray (Lexington County, central South Carolina) — Lake Murray impounds the Saluda River draining the South Carolina Piedmont (Precambrian Batesburg Granite — insoluble) — South Carolina Lexington County Lake Murray Piedmont crystalline watershed produces moderately soft water at 74.5 mg/L with TDS 128.4 mg/L.