Lake Mary Water Hardness & Quality Report (2026)
Water Hardness
19.1 grains per gallon
Source
groundwater
pH Level
8.5
neutral = 7.0
Lead
0.009 mg/L
✓ Below action level
TDS
1105.3 mg/L
Est. Daily Cost
$0.87
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 Lake Mary, your appliances are currently losing 44% efficiency due to mineral buildup.
| Appliance | In Lake Mary | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 3 yrs | 12 yrs | -75% |
| Water Heater | 5 yrs | 15 yrs | -67% |
Regional Water Comparison
How Lake Mary compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Lake Mary, Florida | 326.5 mg/L | 12.8 ppt | 🔴 Very Hard | groundwater |
| Longwood, Florida | 208.5 mg/L | 9.1 ppt | 🔴 Very Hard | groundwater |
| Winter Springs, Florida | 239.5 mg/L | 10.1 ppt | 🔴 Very Hard | groundwater |
| Sanford, Florida | 106 mg/L | 5.9 ppt | 🟡 Moderately Hard | groundwater |
| Casselberry, Florida | 239.5 mg/L | 10.1 ppt | 🔴 Very Hard | groundwater |
National Benchmark
How Lake Mary compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Lake Mary | 326.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Lake Mary's Water Unique?
Local geology and source profile
Lake Mary, Florida, in Seminole County — a Seminole County city adjacent to Sanford and Heathrow in the north Orlando metro — receives its municipal water from the Lake Mary Water Division, drawing from the Upper Floridan Aquifer (Seminole County) through the Lake Mary reverse osmosis treatment plant.
The very hard 326.5 mg/L hardness and very high TDS of 1,105.3 mg/L make Lake Mary one of the hardest water supplies in the USA — reflecting the north Orlando Floridan Aquifer's deeply evaporitic character. The Upper Floridan Aquifer at Seminole County is developed in Eocene Ocala Limestone (high purity carbonate), Eocene Avon Park Formation (dolomite — calcareous), and Paleocene Cedar Keys Formation (evaporitic dolomite-anhydrite — the major TDS contributor at this very deep aquifer zone). The deep Cedar Keys evaporitic loading dramatically elevates both hardness and TDS above the shallower Floridan communities.
At 326.5 mg/L with TDS 1,105, Lake Mary's water is very hard. A water softener is absolutely essential. Scale forms immediately on all surfaces, appliance lifespans are critically shortened, and water heaters fail within 2 years without treatment. The PFAS level of 12.8 ppt is among the highest in this dataset — Naval Air Station Sanford (Seminole County — AFFF legacy, decommissioned Sanford Naval Air Station), Patrick Space Force Base (Brevard County — migrating plume), and the north Orlando PFAS industrial complex contribute to Lake Mary's very elevated readings.
Geology & Source: Lake Mary in Seminole County draws from the Lake Mary Water Division on the Upper Floridan Aquifer (Seminole County, north Orlando metro) — the Upper Floridan at Seminole County is developed in Eocene Ocala Limestone and Paleocene Cedar Keys Formation (evaporitic carbonate — extremely mineralized) — Florida Seminole County Upper Floridan deep evaporitic aquifer produces very hard water at 326.5 mg/L with TDS 1105.3 mg/L in this Seminole County Florida city.