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

The USA national average is 151 mg/L. Airport (≈ 0–59 mg/L) is 121 mg/L softer than average.

Airport Water Hardness & Quality Report (2026)

Water Hardness

soft

~0–59 mg/L

Soft

estimated · not lab-verified

Source

groundwater

pH Level

7.6

neutral = 7.0

Lead

0.007 mg/L

✓ Below action level

TDS

195.1 mg/L

Est. Daily Cost

$0.08

energy & soap waste

Source: See methodology section below · Updated 2026

soft~0–59 mg/LSoft · 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 Airport, your appliances are currently losing 4% efficiency due to mineral buildup.

Appliance	In Airport	Soft Water City	Efficiency Loss
Kettle	8.2 yrs	8.5 yrs	-4%
Washing Machine	11.5 yrs	12 yrs	-4%
Water Heater	14.4 yrs	15 yrs	-4%

Regional Water Comparison

How Airport compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Airport, Hawaii	≈ 0–59 mg/L	1.3 ppt	🟢 Soft	groundwater
Joint Base Pearl Harbor Hickam, Hawaii	20 mg/L	0.7 ppt	🟢 Soft	groundwater
Aliamanu / Salt Lakes / Foster Village, Hawaii	≈ 0–60 mg/L	0.9 ppt	🟢 Soft	groundwater
Halawa, Hawaii	≈ 0–60 mg/L	1 ppt	🟢 Soft	groundwater
Halawa Heights, Hawaii	≈ 0–60 mg/L	1 ppt	🟢 Soft	groundwater

National Benchmark

How Airport compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Airport	≈ 0–59 mg/L	🟢 None
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes Airport's Water Unique?

Local geology and source profile

Source: GroundwaterTDS: 195.1 mg/LpH: 7.6

The Airport area on Oahu, near Honolulu International Airport, is served by the Board of Water Supply (BWS) for the City and County of Honolulu. BWS sources water from deep basal aquifers across Oahu, including the Halawa, Beretania, and Pali aquifers accessed via wells exceeding 300 feet. Treatment involves chlorination at facilities such as the Halawa Wells Station, serving over 1 million residents in urban zones including the airport region. No surface water reservoirs are used for this supply.

The watershed encompasses Oahu's volcanic recharge zones, where precipitation infiltrates through dike-impounded highlands into the basal aquifer system. Geology features Pleistocene and Holocene basaltic lava flows from Ko'olau and Wai'anae volcanoes, forming highly permeable aquifers confined beneath a freshwater-saltwater transition zone. The absence of carbonate minerals in this volcanic matrix produces very soft water with low ionic content from the inert basalt.

Soft water means negligible scale buildup in water heaters, dishwashers, and coffee makers; laundry detergents foam efficiently and soap usage stays low. A softener is not recommended and could introduce unnecessary sodium; sediment filters may help if pipe scale from legacy infrastructure appears. BWS water meets all EPA standards (pH typically 7.3–7.9); the 2025 Consumer Confidence Report confirms lead and copper compliance and no PFAS detections above limits. Treatment includes aeration at select wells, filtration, and chlorination at 0.2–1.0 mg/L residual.

Geology & Source: Oahu basal aquifers — Pleistocene and Holocene tholeiitic basalt lava flows (Ko'olau and Wai'anae volcanoes); no carbonate minerals; rainwater recharge through volcanic rock produces naturally very soft water

Other Hawaii Water Reports

Joint Base Pearl Harbor Hickam

20 mg/L

🟢 Soft

Aliamanu / Salt Lakes / Foster Village

≈ 0–60 mg/L

🟢 Soft

Halawa

≈ 0–60 mg/L

🟢 Soft

Halawa Heights

≈ 0–60 mg/L

🟢 Soft

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 Airport's water safe to drink?

Yes. Airport's water meets all federal safety standards. The hardness is ≈ 0–59 mg/L (Soft), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Airport?

Airport's water is soft at ≈ 0–59 mg/L. A water softener is generally not necessary, though a carbon filter can improve taste and remove any remaining chlorine.

How does Airport compare to the USA average?

The USA national average is 151 mg/L. Airport (≈ 0–59 mg/L) is 121 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 Airport 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.