Halawa 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
123.6 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, your appliances are currently losing 6% efficiency due to mineral buildup.
| Appliance | In Halawa | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.1 yrs | 8.5 yrs | -5% |
| Washing Machine | 12 yrs | 12 yrs | — |
| Water Heater | 13.8 yrs | 15 yrs | -8% |
Regional Water Comparison
How Halawa compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Halawa, Hawaii | 44.5 mg/L | 1 ppt | 🟢 Soft | groundwater |
| Halawa Heights, Hawaii | 45 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 |
| Joint Base Pearl Harbor Hickam, Hawaii | 20 mg/L | 0.7 ppt | 🟢 Soft | groundwater |
National Benchmark
How Halawa compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Halawa | 44.5 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's Water Unique?
Local geology and source profile
Halawa, Hawaii, in Honolulu County — a Honolulu County community adjacent to Aiea and Pearl City on the south Oahu Pearl Harbor corridor — receives its water from the Honolulu Board of Water Supply (HBWS), drawing from the Pearl Harbor basaltic aquifer (Honolulu County) through the south Oahu distribution.
The very soft 44.5 mg/L hardness and TDS of 123.6 mg/L reflect the Oahu Pearl Harbor basaltic aquifer's moderately soft character — consistent with other Honolulu County Pearl Harbor zone communities (Aiea: ~44 mg/L; Pearl City: ~45 mg/L). The Oahu basaltic aquifer at Halawa — Pleistocene Koolau Basalt (insoluble — primary dilutant), Pleistocene Waianae Basalt (insoluble), Quaternary calcareous coral reef limestone (slightly calcareous — minor hardness contributor at the coastal Pearl Harbor margin), and minor Holocene alluvial deposits.
At 44.5 mg/L, Halawa's water is very soft — minimal scale forms, dishwashers require very little detergent, and appliances remain essentially scale-free. Annual descaling is sufficient. The PFAS level of 1.0 ppt is exceptionally low — the Honolulu County Oahu basaltic aquifer deep groundwater is naturally filtered and isolated from most AFFF surface contamination sources.
Geology & Source: Halawa in Honolulu County draws from the Honolulu Board of Water Supply on the Pearl Harbor or Halawa basaltic aquifer (Honolulu County, Oahu, Hawaii) — the basaltic aquifer at Oahu is developed in Pleistocene Waianae and Koolau Basalt (insoluble) — Hawaii Honolulu County Oahu Pleistocene basaltic aquifer produces very soft water at 44.5 mg/L with TDS 123.6 mg/L.