There is a growing challenge of water scarcity as well as pollution in India and efficient water treatment is essential. Have you ever wondered how the water in your home becomes safe to be used in your house? Just before you receive the water, local municipal corporations treat the water to ensure that the water is clean and that you can drink it. Supporting companies engaged in solving these issues, we find water treatment systems building upon this process. A lot of these companies stand out for their technologically advanced and sustainable practices.

Now, let’s look at the top 10 water treatment companies in India in 2025 who are leading the charge in dealing with these waste water problems.

1. Thermax India

Clean air, energy, and water is what Thermax is known as India’s leading water treatment company. A Pune headquartered company, Thermax was started in Mumbai in 1966 as Wanson India Ltd that manufactured hospital sized boilers. In 1995 it went public. Thermax keeps expanding the services, as in 2009 it formed a joint venture with SPX Corporation to provide equipment in the power sector like supercritical boilers and in 2010 a joint venture with Babcock & Wilcox was formed.

2. VA Tech Wabag

India’s multinational, VA Tech Wabag Ltd. focuses on desalination and water treatment for municipal and industrial users. It was founded in Breslau in 1924, and now has its head office in Chennai. In 1999, VA Technologie incorporated Wabag Group and formed VA Tech Wabag GmbH. Water unrelated operations were separated in 2000. In 2005, Rajiv Mittal and ICICI Venture bought the Chennai–based VA Tech India. The company opened globally, including Bucharest, Romania and China, and the company was listed at NSE and BSE in 2010.

3. Ion Exchange India

Founded in 1964, Ion Exchange is a trailblazer in water and environment management both in India and across the world. It was initially founded in India as a subsidiary of the UK’s Permutit Company in 1985 and was fully Indian owned. Established over six decades ago, it provides complete and innovative water and wastewater treatment, solid waste management and waste to energy solutions. Advanced technologies and expert teams serve industries, institutions, municipalities, communities and homes across the Ion Exchange gamut. The company has firm global presence, customer focus, and innovative services to make it a partner for sustainable solutions.

4. Netsol Water

The leading water treatment co, in Delhi NCR, Netsol offers design, fabrication, installation & maintenance services. They treat systems efficiently and proactively address customer needs, which is making them popular for reliable waste management solutions. Netsol has years of expertise along with advanced equipment, testing, analysis and corrective measures. Their fields of work include effluent, sewage treatment, reverse osmosis, wastewater reuse in industrial and municipal industries. Instead, Netsol offers practical solutions to help companies grow business while saving water — the planet’s most precious wealth.

5. Siemens India (Water Technologies Division)

Siemens, another company that’s more known for its engineering innovation, produces water treatment products next on the list. Siemens India’s water technologies division has been supplying reverse osmosis, ultrafiltration and wastewater management solutions, since 1969. They are famed for developing systems that work well for cities and for industry. It’s a trusted name because of efficient water recycling and usage.

6. Voltas Limited

An Indian multinational based in Mumbai is Voltas Limited. The company designs, manufactures and sells home appliances such as air conditioners, refrigerators, washing machines, microwaves and air purifiers. The largest air conditioning company in India is Voltas. Tata Group is the subsidiary of it. Moreover, the company develops cutting edge wastewater treatment processes like moving bed biofilm reactors (MBBR) and sequence batch reactors (SBR). In addition to this, Volta serves the needs of textile, sugar and food processing industries that need water treatment.

7. Hindustan Dorr-Oliver Limited

For nearly 70 years, Hindustan Dorr-Oliver Limited (HDO) has led the industrial EPC market, providing advanced technology solutions. From mining, minerals, water management, fertilisers, chemicals to pulp and papers, they have worked on major projects. In the last five years, HDO has managed water treatment for big refineries and constructed a uranium ore processing plant in Tummalapalle in Andhra Pradesh. Work was also carried out on alumina refineries and phosphatic fertilizer plants by HDO. They have repeat business, because they focus on quality and execution.

8. UEM India Pvt Ltd

UEM Group is an international environmental services company with its headquarters in India. It is specialized for providing a complete range of solutions for water and wastewater collection, treatment and disposal. From engineering and design through construction and installation of treatment facilities, UEM provides services. Noida has a strong design team and the company has over 970 employees. For our expertise in biological treatment, MBR process, and Zero Liquid Discharge, our clients have been ONGC, IOC, Coca-Cola and World Bank etc. in different sectors for our work.

9. SFC Environmental Technologies

The focus of SFC Environmental Technologies is on increasing the efficiency and sustainability of water treatment. They have C-Tech technology that effectively treats wastewater and sewage using the SBR modern process. At present, C-Tech is widely used in many countries, such as the UK, Germany and China, to manufacture recyclable water at low cost. Moreover, their design, installation, key equipment supply, and supply of automation solutions including pneumatic and servo valves, high performance pumps and gyroscopic motors are highly lauded. In addition, SFC gives operations and maintenance services. C-Tech’s most attractive feature is that it is an effective singlestep treatment.

10. Wog Technologies

W.O.G. Technologies is part of the W.O.G. Group and a global leader in the management of water, water services, and renewable energy to industrial and municipal customers. They design advanced solutions that create top quality facilities. W.O.G. Technologies is a leading provider of wastewater treatment services due to our expertise in wastewater treatment. They keep strong customer relationships and offer high tech affordable wastewater systems, as well as installation and maintenance services. W.O.G. has a very good reputation in both industrial and municipal markets with its services managed competently by skilled professionals.

Conclusion

So, contact these companies to discover which technologies approach water and wastewater treatment best for your company. India has plenty of water treatment companies, but these 10 are the best, top and most popular. Hopefully, this post helped you even if you’re planning to invest in them or if you simply wanted to learn more.