Largo Water Hardness & Quality Report (2026)
Water Hardness
5.1 grains per gallon
Source
groundwater
pH Level
7.5
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
199.6 mg/L
Est. Daily Cost
$0.23
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 Largo, your appliances are currently losing 12% efficiency due to mineral buildup.
| Appliance | In Largo | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.7 yrs | 8.5 yrs | -21% |
| Washing Machine | 10.4 yrs | 12 yrs | -13% |
| Water Heater | 12.1 yrs | 15 yrs | -19% |
Regional Water Comparison
How Largo compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Largo, Florida | 87.5 mg/L | 5.3 ppt | 🟡 Moderately Hard | groundwater |
| Clearwater, Florida | 93 mg/L | 5.5 ppt | 🟡 Moderately Hard | groundwater |
| Seminole, Florida | 141 mg/L | 7 ppt | 🟠 Hard | groundwater |
| Dunedin, Florida | 79.5 mg/L | 5.1 ppt | 🟡 Moderately Hard | groundwater |
| Pinellas Park, Florida | 278 mg/L | 11.3 ppt | 🔴 Very Hard | groundwater |
National Benchmark
How Largo compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Largo | 87.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Largo's Water Unique?
Local geology and source profile
Largo, Florida — the third-largest city in Pinellas County on the Gulf Coast of the Tampa Bay area — draws its municipal water supply from the Pinellas County Utilities and Tampa Bay Water regional authority, which supplies the entire Pinellas County area through a blend of: the Hillsborough River surface water, Upper Floridan Aquifer groundwater from the Section 21 Wellfield and associated northeast Hillsborough County wellfields, and desalinated water from the Tampa Bay Seawater Desalination Plant (the largest seawater desalination plant in the US). Tampa Bay Water also blends water through a Regional Surface Water Treatment Facility at C.W. Bill Young Reservoir. Water hardness in Largo measures 87.5 mg/L — classified as moderately soft.
Largo's moderately soft supply for Florida reflects Tampa Bay Water's unique multi-source blending system. The Hillsborough River component (Fort King Street watershed in central Florida) contributes moderate Florida Cretaceous/Eocene limestone hardness. However, the Tampa Bay Seawater Desalination Plant (75 MGD capacity) produces essentially zero-hardness desalinated seawater that is blended into the regional supply, substantially lowering the blended hardness below what pure Floridan Aquifer supply would produce. This Tampa Bay Water desalination component distinguishes the Pinellas–Hillsborough area supply from Florida's east coast cities that rely purely on hard Floridan groundwater.
With hardness at 87.5 mg/L, Largo residents enjoy notably soft water for Florida — minimal scale challenges compared to most Florida cities. Pinellas County Utilities and Tampa Bay Water consistently deliver water meeting all Florida DEP and EPA Safe Drinking Water Act requirements.
Geology & Source: Mixed supply from the Pinellas County Utilities — blending Hillsborough River surface water, Upper Floridan Aquifer groundwater, and Tampa Bay Water regional supply via the Section 21 Wellfield in Hillsborough County; moderately soft supply at 87.5 mg/L in Pinellas County — notably softer than east-coast Florida cities — reflecting Tampa Bay Water's treatment-blending and reverse osmosis fraction.