WH

Water Hardness in Hana, HI

Hawaii · 1 zip codes · 6 matched water systems

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

Dataset updated March 9, 20266 matched water systems in the city rollupIndividual systems and ZIPs can differ. Methodology

Source context

How this city reading is built

This city reading is a weighted rollup across 6 matched water systems and 1 ZIP code. Citywide readings are useful for comparison, but individual utility zones and ZIPs can differ.

Source basis
4 USGS-backed sources
6 matched systems total for this city; 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 in Hana

These systems are matched to Hana, HI. Citywide readings are useful for comparison, but the system serving a specific address may differ from the city average.

6 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
Hana
HI0000217
Soft
19 PPMgroundwater1,284 servedHigh Confidence — USGS Monitoring
Hana Water Systems - South
HI0000201
Very Hard
448 PPMgroundwater816 servedEstimated — Nearby Data
Showing the first 5 systems. Expand to review all matched systems.

Zip Codes in Hana, HI

9671322

What This Means For You

Recommendations are based on the displayed 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 Hana, HI.

Submit Your Data

Frequently Asked Questions

How hard is the water in Hana, HI?

The citywide weighted average water hardness in Hana, HI is 22 PPM (1.3 GPG), classified as soft. This is based on 6 matched water systems.

Do I need a water softener in Hana, HI?

At 22 PPM, the citywide average is relatively soft. A water softener is generally not necessary.

Is hard water in Hana, HI 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 Hana, HI?

Hana, Hawaii is served by 6 matched water systems across 1 zip code.

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.

10 min read

How to Test Water Hardness at Home

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

8 min read