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City water profile

Kualapuu water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Kualapuu, Hawaii.

Median indexed hardness

57PPM

3 indexed ZIPs

Range 55.2–57.1 PPM

State comparison
At state median
State hardness rank
#2 of 12
Matched utilities
1
Active health records
0

City summary

What the indexed records say

Kualapuu has 3 published ZIP profiles across Maui County. The indexed median is 57 PPM, compared with 57 PPM across Hawaii.

Among the 12 Hawaiicities with an indexed median, Kualapuu ranks #2from highest to lowest. Across all 28 state ZIP profiles, available estimates run from 15.6to 125 PPM.

The 55.2–57.1 PPM range shows how much the available ZIP estimates vary within the city label. At least one estimate is marked low confidence, so observation distance and date deserve extra attention.

Hardness distribution

How local ZIP estimates compare

Soft3 ZIPs
Moderately hard0 ZIPs
Hard0 ZIPs
Very hard0 ZIPs

3 of 3 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance
46.3 miles
Profiles with evidence
3/3

Confidence labels

High: 0Moderate: 0Low: 3

Observation window: Aug 14, 2024 to Dec 10, 2024.

ZIP directory

Water reports in Kualapuu

Open a ZIP for site-level provenance and measurements.

ZIP code

96729

Soft

56.7 PPM

Nearest site
46.3 mi
Confidence
Low

View full ZIP evidence →

ZIP code

96757

Soft

55.2 PPM

Nearest site
55.6 mi
Confidence
Low

View full ZIP evidence →

ZIP code

96770

Soft

57.1 PPM

Nearest site
41.3 mi
Confidence
Low

View full ZIP evidence →

Public water systems

Utilities associated with this city

Kualapuu

PWSID HI0000229

Groundwater
System population served
500
Last reported
Jun 3, 2026

The system names this served city; Census place overlap links the city to this ZCTA.

Compliance history

What EPA records show

No active health-based violation appears among the associated systems in the represented EPA reporting quarter. This does not mean every contaminant was tested at every tap.

RecordSystemPeriodStatus
Lead and Copper RuleHI0000229Oct 1, 2022Unaddressed

Practical next steps

Move from index to evidence

  1. 1. Open your ZIP. Check distance, dates, confidence, and the associated utility.
  2. 2. Read the current CCR. Confirm source water, detections, limits, ranges, and notices.
  3. 3. Test the tap when needed. Confirm health concerns or treatment sizing with the right method.

Questions people ask

About water in Kualapuu

Is the water hard?

The indexed city median is 57 PPM. Open the ZIP report to verify the distance and confidence behind that estimate.

Is the tap water safe?

Compliance history is utility-wide and cannot guarantee conditions at every tap. Check current notices and test when address-specific evidence is needed.

Do I need treatment?

Choose treatment only after confirming the problem at the property. A softener targets hardness; contaminant treatment requires a matching, verified performance claim.