'Ewa Gentry Water Hardness & Quality Report (2026)
Water Hardness
2.2 grains per gallon
Source
groundwater
pH Level
7.3
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
101.1 mg/L
Est. Daily Cost
$0.10
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 'Ewa Gentry, your appliances are currently losing 5% efficiency due to mineral buildup.
| Appliance | In 'Ewa Gentry | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.3 yrs | 8.5 yrs | -2% |
| Washing Machine | 12.2 yrs | 12 yrs | — |
| Water Heater | 14.1 yrs | 15 yrs | -6% |
Regional Water Comparison
How 'Ewa Gentry compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ 'Ewa Gentry, Hawaii | 38 mg/L | 0.9 ppt | 🟢 Soft | groundwater |
| Kapolei, Hawaii | 49 mg/L | 1.1 ppt | 🟢 Soft | groundwater |
| 'Ewa Beach, Hawaii | 37.5 mg/L | 0.9 ppt | 🟢 Soft | groundwater |
| Waipahu, Hawaii | 28 mg/L | 0.8 ppt | 🟢 Soft | groundwater |
| Royal Kunia, Hawaii | 76.5 mg/L | 1.5 ppt | 🟡 Moderately Hard | groundwater |
National Benchmark
How 'Ewa Gentry compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ 'Ewa Gentry | 38 mg/L | 🟢 None |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes 'Ewa Gentry's Water Unique?
Local geology and source profile
ʻEwa Gentry, Hawaii, in Honolulu County on the western ʻEwa Plain of Oʻahu — a master-planned community in the ʻEwa Beach corridor, one of Oʻahu's fastest-growing residential areas with planned neighborhoods extending toward Kapolei — receives its municipal water from the Honolulu Board of Water Supply (BWS), which draws from the ʻEwa area wellfields tapping the Oʻahu Basal Aquifer in the western Oʻahu plain. The Honolulu BWS operates numerous wellfields across Oʻahu to supply the island's diverse water demands, with the ʻEwa-Kapolei corridor served by the western ʻEwa wellfield system.
The soft 38 mg/L hardness and low TDS of 101.1 mg/L reflect Oʻahu's classic Hawaiian volcanic island aquifer geology. The Oʻahu Basal Aquifer consists of fresh water floating as a buoyant lens on deeper saltwater within the highly permeable Pliocene and Pleistocene tholeiitic basalt flows of the Waiʻanae Volcano (older, western) and Koʻolau Volcano (younger, eastern) shield eruption sequences. Hawaiian basalt — solidified from iron-magnesium-silicate lava with minimal calcium carbonate content — produces groundwater with very low dissolved mineral content as precipitation infiltrates through the fractured basalt vesicles and lava tubes. The result is characteristically soft, clean-tasting volcanic island groundwater throughout Oʻahu's municipal supply.
At 38 mg/L, ʻEwa Gentry's water is very soft — one of the most mineral-free municipal supplies in the United States. Scale forms very slowly over months in kettles and appliances, soap lathers generously, and the dishwasher consistently produces spotless glassware. Annual descaling of heating appliances is sufficient. The PFAS level of 0.9 ppt is the lowest in this dataset — an outstanding result reflecting the pristine character of the Hawaiian volcanic island aquifer system, the Honolulu BWS's comprehensive source water protection, and Oʻahu's geographic isolation from the continental industrial PFAS sources affecting mainland US water supplies.
Geology & Source: ʻEwa Gentry in Honolulu County draws from the Honolulu Board of Water Supply or ʻEwa area wells tapping the Oʻahu Basal Aquifer — the Oʻahu Basal Aquifer consists of Pliocene and Pleistocene Hawaiian tholeiitic basalt flows of the Waiʻanae and Koʻolau volcanic series — fresh water floating on saltwater in the volcanic basalt aquifer produces very soft water at 38 mg/L with low TDS 101 mg/L characteristic of Hawaiian volcanic island groundwater.