Pukalani, HI water hardness

Tap water hardness
12mg/L
0.7gpg
Soft

Reported by Upper Kula · August 2025

HI typical
55 mg/L
EPA health violations since 2016
0
Data
Utility report

Pukalani water measures 12 mg/L (0.7 gpg) of hardness, soft by USGS standards. The number comes from Upper Kula, dated August 2025.

Pukalani on the hardness scale, with nearby cities
060120180240300360+HI typical 55Kula: 12 mg/LKula 12Kahului: 20 mg/LKahului 20Lahaina: 32 mg/LLahaina 32Kihei: 51 mg/LKihei 51Honolulu: 55 mg/LHonolulu 55Kailua: 103 mg/LKailua 103East Honolulu: 105 mg/LEast Honolulu 105Waimanalo: 105 mg/LWaimanalo 105Kaneohe: 105 mg/LKaneohe 105Wailuku: 150 mg/LWailuku 150Pukalani 12mg/L as calcium carbonate060120180240300360+HI 55Kula: 12 mg/LKula 12Kahului: 20 mg/LKahului 20Lahaina: 32 mg/LLahaina 32Kihei: 51 mg/LKihei 51East Honolulu: 105 mg/LEast Honol. 105Wailuku: 150 mg/LWailuku 15012 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

At 12 mg/L, Pukalani is 43 mg/L below the typical Hawaii figure of 55. None of the 10 nearest cities we track has softer water. The range nearby runs from 12 mg/L in Kula to 150 in Wailuku.

What 12 mg/L means at home

Soap and shampoo lather with very little product. Kettles and showerheads stay mostly free of white crust.

Some people notice that soap feels slow to rinse off in soft water. That slippery feel is normal and harmless.

Hardness is not a health problem, and EPA sets no limit for it. It is a matter of scale and soap.

What to do about it

Nothing, as far as hardness goes. At 12 mg/L a softener would have almost nothing to remove.

Carbon filter

If the water tastes of chlorine, a pitcher or faucet carbon filter takes care of that. It does not change hardness.

EPA record for Pukalani's water system

Upper Kula · PWSID HI0000215

No health-based violations since 2016

Serves about 7,686 people from surface water.

Health-based
0
Monitoring or reporting
0
Open now
0

TapWaterData ties Pukalani to this system. EPA's service-area records do not name Pukalani, so check the utility printed on your water bill.

Health-based means a contaminant above its legal limit or a missed treatment step. Monitoring and reporting violations are late or missing tests and notices. Source: EPA ECHO, 2026Q3 export, violations with periods starting 2016 or later. Full EPA record.

Questions

Is Pukalani water hard?

No. It measures about 12 mg/L (0.7 grains per gallon), which the USGS classes as soft.

What is the water hardness in Pukalani in grains per gallon?

About 0.7 gpg. One grain per gallon equals 17.1 mg/L, so 12 mg/L divided by 17.1 gives 0.7.

Has the Pukalani water system had EPA violations?

EPA records show no health-based violations for Upper Kula since 2016.

Nearby cities

All 23 cities in Hawaii

Hardness data: TapWaterData US Water Hardness (utility report, August 6, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.