Marco Island Water Hardness & Quality Report (2026)
Water Hardness
15.7 grains per gallon
Source
groundwater
pH Level
8.5
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
841.5 mg/L
Est. Daily Cost
$0.72
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 Marco Island, your appliances are currently losing 36% efficiency due to mineral buildup.
| Appliance | In Marco Island | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 3.6 yrs | 12 yrs | -70% |
| Water Heater | 5 yrs | 15 yrs | -67% |
Regional Water Comparison
How Marco Island compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Marco Island, Florida | 269.5 mg/L | 11 ppt | 🔴 Very Hard | groundwater |
| Marco, Florida | 269 mg/L | 11 ppt | 🔴 Very Hard | groundwater |
| East Naples, Florida | 106.5 mg/L | 5.9 ppt | 🟡 Moderately Hard | groundwater |
| Naples, Florida | 229 mg/L | 9.8 ppt | 🔴 Very Hard | groundwater |
| Golden Gate, Florida | 138 mg/L | 6.9 ppt | 🟠 Hard | groundwater |
National Benchmark
How Marco Island compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Marco Island | 269.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Marco Island's Water Unique?
Local geology and source profile
Marco Island, Florida, in Collier County — a Collier County city adjacent to Naples and Goodland on the Ten Thousand Islands coast of southwest Florida, an affluent barrier island resort community — receives its municipal water from Marco Island Utilities, drawing from the Floridan Aquifer through production wells in Collier County.
The extremely hard 269.5 mg/L hardness and very high TDS of 841.5 mg/L reflect the deep southwest Florida Floridan Aquifer's intense carbonate character — similar to other southwest Florida coastal cities (Naples: 250+ mg/L, Cape Coral: 220+ mg/L). The Floridan Aquifer at Marco Island-Collier County is developed in the Eocene Avon Park Formation (dolomitic limestone — high dissolved solids), Miocene Hawthorn Group (phosphatic dolomite — elevated calcium, magnesium, sulfate), and the Eocene Ocala Limestone. The combination of Miocene phosphatic dolomite and deep Eocene carbonate produces the very hard, high-TDS water characteristic of southwest Florida.
At 269.5 mg/L with TDS 842, Marco Island's water is extremely hard. A water softener is essential. Scale builds immediately on all surfaces, appliance lifespans are severely shortened, and water heaters require annual maintenance without softening. The PFAS level of 11.0 ppt warrants a certified reverse osmosis drinking water filter — Collier County firefighting and industrial PFAS sources, the Naples-Marco Island luxury resort development corridor, and the southwest Florida PFAS background contribute to Marco Island's elevated readings.
Geology & Source: Marco Island in Collier County draws from the Marco Island Utilities on the Floridan Aquifer (Collier County, southwest Florida) — the deep Floridan Aquifer in Collier County is developed in Eocene Avon Park Formation and Miocene Hawthorn Group dolomite — Florida Collier County Eocene-Miocene deep carbonate aquifer produces extremely hard water at 269.5 mg/L with very high TDS 841.5 mg/L in this Collier County Florida city.