The water treatment industry in California comprises diverse companies that specialize in delivering clean, safe water for various applications. These companies offer advanced technology solutions such as reverse osmosis, water softening, and innovative filtration systems suitable for both commercial and residential use. The services of these companies extend to industries including manufacturing, pharmaceutical, and food & beverage, ensuring adherence to strict water quality standards. With a growing emphasis on environmental sustainability, several of these companies also incorporate eco-friendly methods into their water treatment processes.


Top 21 water treatment companies in California

1. Puretec Industrial Water

Puretec is a company that provides high purity water solutions for industrial applications across the Southwestern United States. They offer products and services such as industrial reverse osmosis systems, water softeners, tank exchange, and deionized water. With over 80 years of experience, they are trusted by Fortune 500 companies and pride themselves on excellent customer service.


2. Puronics

  • Website: puronics.com
  • Headquarters: Livermore, California, United States
  • Founded: 1947
  • Headcount: 51-200
  • LinkedIn

Puronics is a water treatment solutions company that provides fully integrated water treatment solutions for commercial and industrial clients. They offer water softener systems, filtration systems, and drinking water systems using advanced technology and environmentally-friendly methods.


3. LifeSource Water Systems

LifeSource Water Systems provides water filtration solutions for commercial and residential use. Their filtration systems prevent scale build-up, producing clean water that tastes and feels great. The systems are salt-free and environmentally friendly, requiring no maintenance. They offer a wide range of products and accessories, including whole house water filters and well water treatment solutions.


4. LAKOS Filtration Solutions

  • Website: lakos.com
  • Headquarters: Fresno, California, United States
  • Founded: 1972
  • Headcount: 51-200
  • Latest funding type: Private Equity
  • LinkedIn

Lakos is a filtration solutions company that offers a wide range of products for industrial, HVAC, irrigation, and municipal waterworks applications. Their products help protect pumps from sand, remove sand from well water, and enhance filtration for various industries including automotive, chemical processing, power plants, and more.


5. Rayne Water

  • Website: raynewater.com
  • Headquarters: San Diego, California, United States
  • Founded: 1928
  • Headcount: 51-200
  • LinkedIn

Rayne Water is a water treatment company that has been solving residential and commercial water issues since 1928. They offer a range of solutions including water softeners, reverse osmosis systems, and specialty solutions. With their extended warranty program, customers can enjoy peace of mind. They are dedicated to providing clean and safe drinking water.


6. Lifetime Solutions, Inc.

  • Website: lifetimesi.com
  • Headquarters: Victorville, California, United States
  • Founded: 1989
  • Headcount: 51-200
  • LinkedIn

Lifetime Solutions is an At-Home Service Provider for the world's largest Home Improvement Store. They offer promotional water tests with customers while they shop, as well as a range of water conditioning products and services for residential locations.


7. Compass Water Solutions. inc.

  • Website: compasswater.com
  • Headquarters: Tustin, California, United States
  • Founded: 1973
  • Headcount: 51-200
  • Latest funding type: Acquired
  • LinkedIn

Compass Water Solutions is a leader in water treatment, oil-water separation, and reverse osmosis solutions, addressing pressing water issues. With over forty years of expertise, their high-quality products assist customers in achieving environmental compliance and maximizing productivity. Offering systems for oily water separation, reverse osmosis water generation, and solid-liquid filtration, Compass Water Solutions ensures prompt service and support through its global network. Stay updated with new products, troubleshooting guides, and helpful resources by signing up for their newsletter.


8. AXEON Water Technologies

  • Website: axeonwater.com
  • Headquarters: Temecula, California, United States
  • Founded: 1989
  • Headcount: 51-200
  • LinkedIn

Axeon Water Technologies is a leading manufacturer in the water purification industry. They offer a wide range of solutions for clean and efficient water, including membrane systems, membrane elements, membrane housings, membrane chemicals, and parts & accessories.


9. Yardney Water Filtration Systems

Yardney Water Filtration Systems offers a range of filtration products and solutions including Manual and Automatic Screen Filters, Sand Media, Multi Media, Granular Activated Carbon, Speciality Medias, and Centrifugal Sand Separators.


10. Fidelis Elite Systems

Fidelis Elite Systems Solutions offers whole house water conditioning services including salt-free water refinement systems, multi-stage refinement, and reverse osmosis systems. They provide high-quality service to customers in Lake Elsinore, CA and surrounding areas.


11. Ampac USA

  • Website: ampac1.com
  • Headquarters: Montclair, California, United States
  • Founded: 1990
  • Headcount: 11-50
  • LinkedIn

AMPAC USA is a water treatment company that designs and manufactures reliable commercial reverse osmosis water treatment systems. They offer a wide range of products including seawater desalination systems, emergency portable watermakers, and industrial reverse osmosis systems.


12. Pure Aqua, Inc.

  • Website: pureaqua.com
  • Headquarters: Santa Ana, California, United States
  • Founded: 2000
  • Headcount: 11-50
  • LinkedIn

Pure Aqua, Inc. is a leading water treatment company that specializes in distributing reverse osmosis and filtration systems worldwide. With over 9000 successful projects for premium clients in 200 countries, Pure Aqua provides customized solutions for industrial and commercial water treatment. Their offerings include RO/Membrane systems, brackish water systems, seawater systems, nanofiltration systems, ultrafiltration systems, water filters, membrane pressure vessels, control valves, and disinfection products.


13. RWS Corporation DBA Puroserve Water Conditioning

Rayne Drops is a company that offers efficient and eco-friendly water softeners, water conditioners, and drinking water systems. They are authorized installers of Puroserve® and independent dealers of Rayne Corporation, providing high-quality residential and commercial water treatment systems.


14. Water, Inc.

  • Website: waterinc.com
  • Headquarters: Carson, California, United States
  • Founded: 1977
  • Headcount: 11-50
  • LinkedIn

Water, Inc. is a company that specializes in providing water purification solutions. They offer a range of products and services to ensure clean and safe drinking water for residential and commercial customers.


15. EcoWater of Central California

Ecowatercc.com specializes in providing high-quality water treatment products and solutions. They offer a range of home water filtration systems, water purification, and water softeners to improve the quality and taste of drinking water. With innovative technology and a commitment to clean water resources, Ecowatercc.com ensures that customers have access to clean, purified water for a healthier and better life.


16. Aquakleen Products, Inc

Aquakleen Products Inc. is a water treatment system that refines, softens, neutralizes, clarifies, and filters every drop of water before it enters your home. Their goal is to provide clean, clear, and odor-free water for drinking, bathing, and cooking.


17. PAX Water Technologies - A UGSI Solutions Company

  • Website: paxwater.com
  • Headquarters: Richmond, California, United States
  • Founded: 2006
  • Headcount: 11-50
  • LinkedIn

Paxwater.com is a company that offers innovative water treatment solutions. They specialize in providing state-of-the-art water treatment products and services to various industries. Their cutting-edge technologies help improve water quality, increase efficiency, and reduce environmental impact.


18. Pure Effect, Inc.

  • Website: pureeffect.com
  • Headquarters: Fullerton, California, United States
  • Founded: 1992
  • Headcount: 11-50
  • LinkedIn

Pure Effect, Inc. is an environmental solutions company based in Fullerton, CA. They offer a range of treatment systems, equipment, and services for various environmental applications. In addition to remediation and filtration systems, they provide discharge permitting, engineering design, vacuum & rebed services, bulk activated carbon sales, air purification HVAC services, and specialty impregnated carbon sales.


19. H2O Engineering, Inc.

  • Website: h2oengineering.com
  • Headquarters: San Luis Obispo, California, United States
  • Founded: 2000
  • Headcount: 11-50
  • Latest funding type: Acquired
  • LinkedIn

H2O Engineering is a provider of water treatment products and services for commercial, industrial, and agricultural applications. They offer a wide range of technologies and solutions to meet the specific needs of their customers.


20. Genesys - PWT

PWT Chemicals is a specialty chemical company that develops and formulates membrane-based water treatment solutions. With a complete line of RO pretreatment and maintenance products, they offer comprehensive analytical and technical capabilities to maximize system performance and minimize chemical usage.


21. Water Techniques

Water Techniques is a company that offers service solutions to clients who rely on high-quality water for their operations. They provide comprehensive water treatment systems for residential and commercial markets in Southern California. Their commitment to service extends to custom designing products to meet the specific needs of their customers.


Want to find more water treatment companies?


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...and a lot more!