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Water Hardness in 96770

Maunaloa, Hawaii · Maui County

23 PPM
1.3 GPG
Soft
0Soft60120180300+
High Confidence — USGS Monitoring

Dataset updated March 9, 2026Matched to 5 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology

Source context

How this ZIP reading is built

This ZIP reading is built from 5 matched water systems. When more than one system is matched, the displayed value is weighted toward larger known service populations when that data is available.

Source basis
3 USGS-backed sources
5 matched systems total for this ZIP; USGS monitoring is used where treated-water reports are unavailable.
Water source profile
Primarily surface water
Surface-water hardness can shift with reservoirs, runoff, season, and treatment. This profile is weighted by known population served across matched systems.
Data recency
March 9, 2026
Dataset rebuilt March 9, 2026; individual utility reporting years can vary.

Hardness is a mineral-content reading, not a drinking-water safety rating. Use it for scale, appliance, and softener decisions; check your utility report or test your tap before sizing treatment equipment. See how we calculate local readings.

Water Systems Serving 96770

These are the systems matched to this ZIP code. The displayed ZIP value is weighted toward larger known service populations when population data is available.

5 water systems
PWSID is the public water system identifier. Data Source shows whether the hardness value comes from a treated-water report, USGS monitoring, or a local estimate; source year is shown when available.
Wailuku
HI0000212
Soft
19 PPMsurface water74,511 servedHigh Confidence — USGS Monitoring
Makawao
HI0000213
Soft
19 PPMsurface water29,868 servedHigh Confidence — USGS Monitoring
Lahaina
HI0000214
Soft
19 PPMsurface water20,065 servedHigh Confidence — USGS Monitoring
Maunaloa-Kaluakoi
HI0000231
Very Hard
448 PPMgroundwater1,000 servedEstimated — Nearby Data
Kipu
HI0000245
Very Hard
448 PPMgroundwater80 servedEstimated — Nearby Data

Nearby Zip Codes

967292796757219674244896748219676330

What This Means For You

Recommendations are based on the displayed ZIP hardness reading. Confirm your tap reading before sizing or buying treatment equipment.

Your Water Is Soft

Your water hardness is in the soft range. You likely don't need a water softener. Enjoy your naturally soft water!

Know your water hardness?

If you've tested your water or have your utility's CCR report, share your reading to help us improve accuracy for Maunaloa, HI (96770).

Submit Your Data

Frequently Asked Questions

Is the water hard in Maunaloa, HI (96770)?

The average water hardness in 96770 is 23 PPM (1.3 GPG), which is classified as soft.

Do I need a water softener in 96770?

At 23 PPM, your water is relatively soft. A water softener is generally not necessary.

Is hard water in 96770 safe to drink?

Water hardness itself is a mineral-content reading, not a drinking-water safety rating. Calcium and magnesium are naturally occurring minerals, but you should check your utility's Consumer Confidence Report for contaminant and compliance information.

How many water systems serve 96770?

Zip code 96770 in Maunaloa, Hawaii is served by 5 water systems.

Learn More About Your Water

Water Hardness Scale: PPM and GPG Chart

Use the USGS water hardness scale to compare PPM, GPG, and mg/L levels from soft to very hard water.

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How to Test Water Hardness at Home

Compare free lookups, soap tests, test strips, liquid drop kits, and lab tests for measuring water hardness.

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