Company lists · Data refreshed September 2026
Top 23 Activated sludge treatment plant builders based in India
RevenueBase identified 146 activated sludge treatment plant builders headquartered in India as of September 2026 and tracks 1,635 professional contacts across them, including 127 with verified work emails. Pune is the largest hub.
This list covers activated sludge treatment plant builders headquartered in India, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 19, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 23 largest activated sludge treatment plant builders based in India
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 323 contacts → | ||||
Indirect evidence “Since 2009, Enviro has combined engineering excellence with a commitment to sustainability in water and wastewater solutions across India." Enviro Infra Engineers Limited stands…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 2 | 191 contacts → | ||||
Indirect evidence “HNB ENGINEERS PVT.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 3 | 68 contacts → | ||||
Indirect evidence “Hydrotech Paryavaran (India) Pvt.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 4 | 55 contacts → | ||||
Strong evidence “BWSSB Sewage Treatment Plant provides you the best range of sewage treatment services, water sewage treatment services, waste water treatment service, water tank maintenance…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 5 | 48 contacts → | ||||
Strong evidence “We are delighted to introduce ourselves as Sun Enviro Technologies Pvt Ltd, a leading provider of wastewater treatment plants, water treatment plants, water recycle plants, sewage…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 6 | 41 contacts → | ||||
Partial evidence “World Water Works International Inc together with its affiliated companies is an innovator in the water & wastewater treatment industry, driven to help industrial and municipal…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 7 | 32 contacts → | ||||
Partial evidence “Hydroflux Engineering Pvt Ltd is a trusted STP plant manufacturer and ETP plant manufacturer based in Delhi & Mumbai, serving industries across North and South India.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 8 | 25 contacts → | ||||
Indirect evidence “For over four decades, Metcon Water Systems Pvt.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 9 | 21 contacts → | ||||
Indirect evidence “At Inditron, we believe that every drop of water can be recovered, reused, and respected.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 10 | 20 contacts → | ||||
Indirect evidence “Quality Water Management Systems (QWMS) Private Limited IS A TEAM OF PROFESSIONALLY QUALIFIED AND EXPERIENCED ENGINEERS IN THE FIELD OF WATER AND WASTE WATER MANAGEMENT.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 11 | 18 contacts → | ||||
Indirect evidence “Qualicom is a leading organisation specialising in Environment Engineering with its core competencies in managing Water and Waste water and controlling Air Pollution.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 12 | 16 contacts → | ||||
Indirect evidence “Transcend Cleantec Pvt.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 13 | 13 contacts → | ||||
Partial evidence “A pioneering team dedicated to transforming wastewater challenges into innovative sewage treatment solutions.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 14 | 12 contacts → | ||||
Strong evidence “Product, Project execution for Wastewater aeration and mixing | Wastewater spray coolers | Anaerobic Reactors | Modular treatment plants | Odour Control | Lake rejuvenation | USV…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 15 | 12 contacts → | ||||
Partial evidence “Distington specialises in providing advanced, sustainable, and cost-effective solutions for the treatment of effluent, wastewater, and sewage.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 16 | 11 contacts → | ||||
Partial evidence “ZLD TECHNOLOGIES PVT LTD is highly technology oriented Engineering organisation, which serves in the field of Waste Water Treatment, UF, NF, MF, RO, MBR, Vacuum Systems, TVR…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 17 | 10 contacts → | ||||
Indirect evidence “Aquacare Solution Enviro Engineers is an information technology and services company based out of P-223 Mayur Trade Centre, Pune, Maharastra, India.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 18 | 10 contacts → | ||||
Strong evidence “We are a leading technology-based equipment manufacturer and solution provider to municipal and industrial water treatment plants.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 19 | 9 contacts → | ||||
Partial evidence “About Sritech Since 1995, Sritech has been a trusted name in solid–liquid separation technology, delivering high–quality, customized solutions for water and wastewater treatment…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 20 | 4 contacts → | ||||
Partial evidence “Levapor India Pvt Ltd is an engaged in providing process engineering solutions for the treatment of complex industrial effluent, municipal wastewater and polluted air/gas…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 21 | 2 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 22 | 2 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 23 | 1 contacts → | ||||
Partial evidence “RENC is an Engineering, Procurement and Construction company in the field of Water and Wastewater treatment.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: activated sludge treatment plant builders. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names activated sludge treatment plant builders.
- Partial evidence
- Its own public description names part of activated sludge treatment plant builders, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name activated sludge treatment plant builders. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 23 of 146 activated sludge treatment plant builders based in India
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Activated sludge treatment plant builders based in India at a glance
As of Sep 19, 2026Companies by employee count
Email recency for this list is measured worldwide rather than for India, so it is reported there. Company counts and contact totals on this page are exact for India, over 146 companies.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among activated sludge treatment plant builders, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in India whose own description of what they do matches “activated sludge treatment plant builders”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names activated sludge treatment plant builders), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among activated sludge treatment plant builders, and records with no verified work email. Companies headquartered outside India are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 127 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 19, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names activated sludge treatment plant builders, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many activated sludge treatment plant builders are there based in India?
RevenueBase identified 146 activated sludge treatment plant builders headquartered in India as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
Enviro Infra Engineers LTD, headquartered in Delhi, tops this list with the largest team on record.
Which city has the most activated sludge treatment plant builders?
Pune leads with 14 headquartered companies, followed by Chennai (12) and Ahmedabad (11).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 127 verified decision-maker contacts tracked across these 146 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 19, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
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