Halawa Heights Water Hardness & Quality Report (2026)
Water Hardness
2.6 grains per gallon
Source
groundwater
pH Level
7.4
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
125.1 mg/L
Est. Daily Cost
$0.12
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 Halawa Heights, your appliances are currently losing 6% efficiency due to mineral buildup.
| Appliance | In Halawa Heights | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.1 yrs | 8.5 yrs | -5% |
| Washing Machine | 11.9 yrs | 12 yrs | -1% |
| Water Heater | 13.8 yrs | 15 yrs | -8% |
Regional Water Comparison
How Halawa Heights compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Halawa Heights, Hawaii | 45 mg/L | 1 ppt | 🟢 Soft | groundwater |
| Halawa, Hawaii | 44.5 mg/L | 1 ppt | 🟢 Soft | groundwater |
| Aliamanu / Salt Lakes / Foster Village, Hawaii | 35 mg/L | 0.9 ppt | 🟢 Soft | groundwater |
| Waimalu, Hawaii | 24 mg/L | 0.7 ppt | 🟢 Soft | groundwater |
| Airport, Hawaii | 63 mg/L | 1.3 ppt | 🟡 Moderately Hard | groundwater |
National Benchmark
How Halawa Heights compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Halawa Heights | 45 mg/L | 🟢 None |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Halawa Heights's Water Unique?
Local geology and source profile
Halawa Heights, Hawaii, in Honolulu County — a Honolulu County community adjacent to Halawa and Pearl City near Pearl Harbor on Oahu — receives its water from the Honolulu Board of Water Supply (BWS), drawing from the Pearl Harbor Aquifer (Honolulu County) through the central Oahu distribution.
The moderately soft 45 mg/L hardness and TDS of 125.1 mg/L reflect the Oahu Pearl Harbor Aquifer supply's soft character — driven by the Hawaiian basalt lava flow aquifer with very limited calcareous dissolution, with slightly more hardness than the windward Oahu supplies due to the Pearl Harbor Aquifer's coastal carbonate cap rock contribution at the basal aquifer margin (compare Waimalu HI on the same Pearl Harbor-central Oahu system). The Pearl Harbor Aquifer at Honolulu County — Pleistocene basalt lava flows (insoluble — primary dilutant), Quaternary coastal carbonate caprock (slightly calcareous — primary hardness contributor), and Pleistocene alluvium (slightly calcareous — secondary contributor).
At 45 mg/L, Halawa Heights' water is moderately soft — light scale forms very slowly in appliances, dishwashers remain efficient, and no softening is needed. Annual descaling is appropriate. The PFAS level of 1.0 ppt is among the lowest in the dataset — no PFAS filtration urgency for Halawa Heights. Pearl Harbor Naval Complex (Honolulu County) contributes minor PFAS to the region but readings are well below action levels.
Geology & Source: Halawa Heights in Honolulu County draws from the Honolulu Board of Water Supply on the Pearl Harbor Aquifer (Honolulu County, Oahu, Hawaii) — the Pearl Harbor Aquifer at Oahu is developed in Pleistocene basalt lava flows (insoluble) with Quaternary carbonate cap rock (slightly calcareous) — Hawaii Honolulu County Pearl Harbor Aquifer Pleistocene basalt-carbonate supply produces moderately soft water at 45 mg/L with TDS 125.1 mg/L.