Lexington Park Water Hardness & Quality Report (2026)
Water Hardness
6 grains per gallon
Source
reservoir
pH Level
7.6
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
177.8 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 Lexington Park, your appliances are currently losing 14% efficiency due to mineral buildup.
| Appliance | In Lexington Park | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.2 yrs | 8.5 yrs | -27% |
| Washing Machine | 9.8 yrs | 12 yrs | -18% |
| Water Heater | 11.5 yrs | 15 yrs | -23% |
Regional Water Comparison
How Lexington Park compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Lexington Park, Maryland | 102.5 mg/L | 5.4 ppt | 🟡 Moderately Hard | reservoir |
| California, Maryland | 92 mg/L | 4.8 ppt | 🟡 Moderately Hard | reservoir |
| Chesapeake Ranch Estates, Maryland | 148 mg/L | 8 ppt | 🟠 Hard | reservoir |
| Chesapeake Ranch Estates-Drum Point, Maryland | 95.5 mg/L | 5 ppt | 🟡 Moderately Hard | reservoir |
| Cambridge, Maryland | 98.5 mg/L | 5.2 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Lexington Park compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Lexington Park | 102.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Lexington Park's Water Unique?
Local geology and source profile
Lexington Park, Maryland, in Saint Mary's County — a Saint Mary's County census-designated place adjacent to California (MD) and Leonardtown on the Patuxent River in south Maryland — receives its water from the Saint Mary's County Department of Public Works, drawing from Patuxent River aquifer wells through the south Maryland distribution.
The moderately hard 102.5 mg/L hardness and TDS of 177.8 mg/L reflect the Saint Mary's County Coastal Plain supply's moderate character — the Cretaceous Patuxent Formation is primarily insoluble sand and gravel, while the Tertiary Nanjemoy Formation calcareous marine clays contribute modest dissolved minerals to the shallow Patuxent watershed water table (compare California MD: 100/172 in Saint Mary's County comparable; Leonardtown MD: 105/183 in Saint Mary's County comparable; Lexington Park consistent moderate from the same Saint Mary's County Patuxent Cretaceous-Tertiary supply). The Patuxent River aquifer — Cretaceous Patuxent Formation (insoluble — primary dilutant), Tertiary Nanjemoy Formation (slightly calcareous — primary hardness contributor), and Quaternary Coastal Plain alluvium (calcareous — minor TDS).
At 102.5 mg/L with TDS 178, Lexington Park's water is moderately hard — mild scale buildup. Semi-annual descaling is appropriate. The PFAS level of 5.4 ppt is moderate — NAS Patuxent River, a major naval air station adjacent to Lexington Park, is the primary local PFAS contributor. A certified filter is recommended. Review the county utility's annual water quality report.
Geology & Source: Lexington Park in Saint Mary's County draws from SMECO Water on the Patuxent River aquifer (Saint Mary's County, south Maryland) — the Maryland coastal plain drains Cretaceous Patuxent Formation (insoluble) and Tertiary Nanjemoy Formation (slightly calcareous) — Maryland Saint Mary's County Patuxent Cretaceous-Tertiary supply produces moderately hard water at 102.5 mg/L with TDS 177.8 mg/L.