Kuliouou - Kalani Iki Water Hardness & Quality Report (2026)
Water Hardness
3.4 grains per gallon
Source
groundwater
pH Level
7.5
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
172.9 mg/L
Est. Daily Cost
$0.15
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 Kuliouou - Kalani Iki, your appliances are currently losing 8% efficiency due to mineral buildup.
| Appliance | In Kuliouou - Kalani Iki | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.7 yrs | 8.5 yrs | -9% |
| Washing Machine | 11.5 yrs | 12 yrs | -4% |
| Water Heater | 13.3 yrs | 15 yrs | -11% |
Regional Water Comparison
How Kuliouou - Kalani Iki compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Kuliouou - Kalani Iki, Hawaii | 57.5 mg/L | 1.2 ppt | 🟢 Soft | groundwater |
| Niu Valley, Hawaii | 79.5 mg/L | 1.5 ppt | 🟡 Moderately Hard | groundwater |
| East Honolulu, Hawaii | 31 mg/L | 0.8 ppt | 🟢 Soft | groundwater |
| Palolo, Hawaii | 27 mg/L | 0.8 ppt | 🟢 Soft | groundwater |
| Hawai'i Kai, Hawaii | 56 mg/L | 1.2 ppt | 🟢 Soft | groundwater |
National Benchmark
How Kuliouou - Kalani Iki compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Kuliouou - Kalani Iki | 57.5 mg/L | 🟢 None |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Kuliouou - Kalani Iki's Water Unique?
Local geology and source profile
Kuliouou - Kalani Iki, Hawaii, in Honolulu County — a Honolulu County community adjacent to Hawaii Kai and Aina Haina on the southeast Oahu coast below the Ko'olau Mountains — receives its water from the Oahu Board of Water Supply (BWS), drawing from the Ko'olau Aquifer (southeast Oahu, Honolulu County) through east Oahu distribution.
The moderately soft 57.5 mg/L hardness and TDS of 172.9 mg/L reflect the southeast Oahu Ko'olau basalt aquifer character — consistent with central Honolulu readings (Nuuanu-Punchbowl: 67.5 mg/L) with the TDS/hardness ratio (~3.0) reflecting basaltic mineral ions. The Ko'olau Aquifer at southeast Oahu is developed in Pliocene Ko'olau Basalt (insoluble tholeiitic basalt — very low calcium-magnesium content), with minor Quaternary sedimentary caprock (slightly calcareous coral limestone near the coast). The insoluble Ko'olau basalt produces the moderately soft east Oahu supply.
At 57.5 mg/L, Kuliouou-Kalani Iki's water is moderately soft — light scale forms slowly in appliances, dishwashers remain efficient, and bathroom fixtures need occasional cleaning. Semi-annual descaling is appropriate. The PFAS level of 1.2 ppt is among the absolute lowest in this dataset — southeast Oahu's Ko'olau aquifer is well-protected from AFFF surface contamination, and the remote east Oahu residential setting produces essentially pristine PFAS readings.
Geology & Source: Kuliouou - Kalani Iki in Honolulu County draws from the Oahu Board of Water Supply on the Ko'olau Aquifer (Honolulu County, east Oahu) — the Ko'olau Aquifer is developed in Pliocene Ko'olau Basalt (insoluble tholeiitic basalt) — Hawaii Honolulu County Ko'olau volcanic basalt aquifer produces moderately soft water at 57.5 mg/L with TDS 172.9 mg/L in this Honolulu County Hawaii community.