Oak Grove Water Hardness & Quality Report (2026)
Water Hardness
3.7 grains per gallon
Source
reservoir
pH Level
7.4
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
99.7 mg/L
Est. Daily Cost
$0.17
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 Oak Grove, your appliances are currently losing 8% efficiency due to mineral buildup.
| Appliance | In Oak Grove | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.5 yrs | 8.5 yrs | -12% |
| Washing Machine | 11.3 yrs | 12 yrs | -6% |
| Water Heater | 13.1 yrs | 15 yrs | -13% |
Regional Water Comparison
How Oak Grove compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Oak Grove, South Carolina | 63 mg/L | 3.5 ppt | 🟡 Moderately Hard | reservoir |
| Seven Oaks, South Carolina | 74.5 mg/L | 4.2 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 |
| Saint Andrews, South Carolina | 110 mg/L | 6.1 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Oak Grove compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Oak Grove | 63 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Oak Grove's Water Unique?
Local geology and source profile
Oak Grove, South Carolina, in Lexington County — a Lexington County community adjacent to Lexington and Irmo in the Columbia, SC area — receives its water from the Lexington Water or Irmo-Chapin Recreation Commission service area, drawing from the Lake Murray supply through the Piedmont South Carolina distribution.
The soft 63 mg/L hardness and low TDS of 99.7 mg/L reflect the Lexington County supply's soft Piedmont character — the Precambrian Carolina Slate Belt and Cambrian Columbia Belt schist are largely insoluble metamorphic formations in the South Carolina Piedmont; Lake Murray draws from clean insoluble Piedmont granite-slate watersheds that contribute minimal dissolved mineral content (compare Lexington SC: 60/93 in Lexington County comparable; Irmo SC: 65/103 in Richland County comparable; Oak Grove consistent soft from the same Lexington County Lake Murray Precambrian insoluble supply). The Lake Murray watershed — Precambrian Carolina Slate Belt (insoluble — primary dilutant), Cambrian Columbia Belt schist (insoluble — secondary dilutant), and Quaternary South Carolina Piedmont alluvium (slightly calcareous — minimal TDS).
At 63 mg/L with TDS 100, Oak Grove's water is soft — minimal scale buildup, appliances last well. Annual descaling as preventative maintenance is sufficient. The PFAS level of 3.5 ppt is moderate — a certified drinking water filter provides added protection. Review the Lexington Water District's annual water quality report.
Geology & Source: Oak Grove in Lexington County draws from the Lexington Water on the Lake Murray supply (Lexington County, Piedmont South Carolina) — the South Carolina Piedmont at Lexington County draws from Precambrian Carolina Slate Belt (insoluble) and Cambrian Columbia Belt schist (insoluble) — South Carolina Lexington County Lake Murray Precambrian insoluble supply produces soft water at 63 mg/L with TDS 99.7 mg/L.