Water Treatment & Softeners in Honolulu, HI

Compare 30 water treatment & softeners contractors near you in Honolulu and surrounding area with an average rating of 4.6/5. Get free quotes, read reviews, and find the right pro for your project.

Last updated March 23, 2026

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Other Businesses in This Area

PureSpring Water Softeners & Filters

3 years online
purespringwatersoftenersfiltershonolulu.com

Wellness Water Filtration Systems

5½+ years online
wellnesswaterfiltrationsystems.com/honolulu-hi

Aloha Kangen Water

5.04+ years online
alohakangenwater.com

Blessed & Beautiful Kangen Water LLC

5.02½+ years online
blessedandbeautifulwaterkangen.com

Kangen Water 808

5.0~5 years online
kangenwater808.com

Kangen Water Store

5.0

Alpha Omega Drains, Sewers, & Septic

4.92+ years online
aoplumbinghi.comGet a Free Quote

Tankless Hawaii

4.93½+ years online
tanklesshawaii.net

Waialae Plumbing & Construction

4.911+ years online
waialaeplumbing.comGet a Free Quote

Roto-Rooter Plumbing & Water Cleanup

4.8~29 years online
rotorooter.com/honolulu

Steve’s Plumbing & A/C Service

4.811+ years online
stevesplumbinghawaii.com/oahuGet a Free Quote

Waikiki Aquarium Service

4.85½+ years online
thecoralconservancy.org/aquarium-services

Allens Plumbing

4.722 years online
allensplumbinghi.com/oahu-plumbing-service-areas

Hawaii Water Damage Restoration

4.72½+ years online
hawaiiwaterdamagerestoration.com

Toell U.S.A. Corporation

4.012 years online
toellusa.com

Enagic USA Honolulu Office

3.6~23 years online
enagic.com

Paradise Water

1.0

Water Treatment & Softeners in Nearby HI Cities

Water Treatment & Softeners in Honolulu, HI

Water treatment and softeners in Honolulu serves a Pacific island market: single-family homes, condos, military housing, and commercial properties. Typical jobs include whole-home water softeners (HI water has hardness), reverse-osmosis drinking-water systems (popular for taste), and commercial water treatment. Hawaii water quality and tropical climate drive approach.

Residential water softeners in Honolulu run $2,500-$5,500 (island premium); reverse osmosis $1,500-$4,000; commercial $5,000-$50,000. Hawaii requires a Plumbing license. Honolulu permits apply.

Frequently Asked Questions

Is Honolulu water hard?
Variable — testing recommended.
Why are HI costs higher?
Material delivery from mainland.
Salt-air?
Marine-grade components within 2 km of water.

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