Pearl City vs Kapolei Water Quality
Side-by-side water quality comparison for two Hawaii cities.
If you are comparing Pearl City and Kapolei water quality - whether moving, choosing between the two, or curious about a relative's water - here is what the data shows.
Hardness comparison
Pearl City has somewhat harder water at 75 PPM versus Kapolei at 70 PPM, a difference of 5 PPM. Kapolei has moderate hardness where a softener is optional.
Water sources and why they differ
Water sources differ: Pearl City draws from Pearl Harbor aquifer wells, while Kapolei uses Ewa wells. Both use similar source types, but local geology creates the hardness variation.
What this means for you
Chlorine levels are higher in Kapolei at 1.6 mg/L. If the taste bothers you, a carbon filter or shower filter is an easy fix.
Not sure what your specific situation needs? Take the quiz to get a recommendation based on your water data, budget, and household size.
| Metric | Pearl City | Kapolei |
|---|---|---|
| Hardness | 75 PPM | 70 PPM |
| GPG | 4.4 | 4.1 |
| TDS | 99 PPM | 87 PPM |
| PFAS | 0 ppt | 3 ppt |
| Lead | 1.3 ppb | 1 ppb |
| Chlorine | 0.7 mg/L | 1.6 mg/L |
| Level | Moderately Hard | Moderately Hard |