How does Naples's water compare to the national average?

The USA national average is 151 mg/L. Naples (≈ 120–179 mg/L) is 1 mg/L softer than average.

Naples Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

groundwater

pH Level

8.4

neutral = 7.0

Lead

0.006 mg/L

✓ Below action level

TDS

672.1 mg/L

Est. Daily Cost

$0.40

energy & soap waste

Source: See methodology section below · Updated 2026

hard~120–179 mg/LHard · est.

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 Naples, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In Naples	Soft Water City	Efficiency Loss
Kettle	6.8 yrs	8.5 yrs	-20%
Washing Machine	9.6 yrs	12 yrs	-20%
Water Heater	12 yrs	15 yrs	-20%

Regional Water Comparison

How Naples compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Naples, Florida	≈ 120–179 mg/L	0 ppt	🟠 Hard	groundwater
East Naples, Florida	≈ 120–179 mg/L	5.9 ppt	🟠 Hard	groundwater
Golden Gate, Florida	≈ 120–179 mg/L	6.9 ppt	🟠 Hard	groundwater
Marco, Florida	≈ 180+ mg/L	46.5 ppt	🔴 Very Hard	reservoir
Bonita Springs, Florida	≈ 120–179 mg/L	0 ppt	🟠 Hard	groundwater

National Benchmark

How Naples compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Naples	≈ 120–179 mg/L	🟠 Moderate
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes Naples's Water Unique?

Local geology and source profile

Source: GroundwaterTDS: 672.1 mg/LpH: 8.4

The City of Naples Utilities Division serves the Naples, Florida area in Collier County, drawing its drinking water supply from the Floridan aquifer system. The utility operates water treatment facilities that process groundwater from this extensive underground reservoir before distribution to residential and commercial customers throughout the service area.

The Floridan aquifer underlying Naples consists primarily of Tertiary-age limestone and dolomite formations. These soluble carbonate rock layers naturally contribute dissolved minerals—particularly calcium and magnesium—to groundwater as water percolates through the aquifer. This geological setting is responsible for the moderately hard character of Naples's municipal water supply, a condition common throughout south-central Florida where the Floridan aquifer is the primary freshwater source.

At the moderately hard level, residents may notice scale buildup on fixtures, reduced soap lather, and mineral deposits on glassware and dishes. Appliances such as water heaters, dishwashers, and washing machines are most affected by mineral accumulation over time. Many homeowners choose to install point-of-use water softeners or ion-exchange systems, particularly for laundry and dishwashing; regular descaling with vinegar and routine appliance maintenance are recommended. Residents should consult the most recent Annual Water Quality Report from the City of Naples Utilities Division or contact the Water Treatment Plant at 239-213-3002 for current compliance details.

Geology & Source: Floridan aquifer; Tertiary-age limestone and dolomite carbonate formations dissolve to release calcium and magnesium, producing moderately hard supply typical of south-central Florida hydrogeology

Other Florida Water Reports

East Naples

≈ 120–179 mg/L

🟠 Hard

Golden Gate

≈ 120–179 mg/L

🟠 Hard

Marco

≈ 180+ mg/L

🔴 Very Hard

Bonita Springs

≈ 120–179 mg/L

🟠 Hard

Report an Issue

Notice an error or missing data? Help us keep this page accurate. If you spot incorrect water hardness, outdated utility info, or missing details, please let us know.

All reports are reviewed by our team. Thank you for supporting data quality!

Frequently Asked Questions

Is Naples's water safe to drink?

Yes. Naples's water meets all federal safety standards. The hardness is ≈ 120–179 mg/L (Hard), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Naples?

At ≈ 120–179 mg/L (Hard), Naples's water will cause significant limescale on kettles, washing machines, and water heaters. A water softener or descaler is strongly recommended to extend appliance lifespan and reduce energy bills by up to 20%.

How does Naples compare to the USA average?

The USA national average is 151 mg/L. Naples (≈ 120–179 mg/L) is 1 mg/L below the national average. The softest major city is Scarsdale at just 0.02 mg/L.

Data Sources & Methodology

Water quality data for Naples is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.

Estimated

Water Hardness

Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.

Estimated

Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.

Estimated

TDS — Total Dissolved Solids

Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.

Measured

PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances

EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.

Modelled

Lead

Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.

Calculated

Appliance Lifespan

Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.