Company lists · Data refreshed September 2026

Top 25 Hydro engineering and consulting firms based in Johannesburg, South Africa

Name: Hydro engineering and consulting firms based in Johannesburg, South Africa
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 88 companies tracked

RevenueBase identified 88 hydro engineering and consulting firms headquartered in Johannesburg, South Africa as of September 2026 and tracks 2,010 professional contacts across them, including 759 with verified work emails. Across South Africa, Johannesburg is the largest hub for this category.

This list covers hydro engineering and consulting firms headquartered in Johannesburg, South Africa, 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 28, 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 28, 2026 86% judged on-target in blind review

88Companies

2,010Contacts tracked

759Verified emails

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The 25 largest hydro engineering and consulting firms based in Johannesburg, South Africa

Ranked by team size

Top 25 of 88 hydro engineering and consulting firms based in Johannesburg, South Africa, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to hydro engineering and consulting firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	WSP In Africa	Partial evidence	Johannesburg, South AfricaHQ checked Sep 28, 2026	501-1,000	635 contacts →
	Partial evidence “We are one of the world’s leading professional services firms, uniting our engineering, advisory and science-based expertise to shape communities to advance humanity.” Source: RevenueBase Database · checked Sep 28, 2026
2	Jones & Wagener PTY LTD	Partial evidence	Johannesburg, South AfricaHQ checked Sep 28, 2026	51-200	228 contacts →
	Partial evidence “Jones & Wagener is a specialist firm of consulting engineers and scientists based in South Africa.” Source: RevenueBase Database · checked Sep 28, 2026
3	JG Afrika PTY LTD	Strong evidence	Johannesburg, South AfricaHQ checked Sep 28, 2026	201-500	221 contacts →
	Strong evidence “JG Afrika, a leading multi-disciplinary engineering and environmental consultancy in South Africa, provides civil and structural engineering and environmental consulting services…” Source: RevenueBase Database · checked Sep 28, 2026
4	Henry Fagan Consulting Engineers & Project Managers	Partial evidence	Johannesburg, South AfricaHQ checked Sep 28, 2026	201-500	99 contacts →
	Partial evidence “At Henry Fagan Consulting Engineers & Project Managers, we are a 100% black-owned, design-focused firm with over 40 years of experience delivering innovative, sustainable, and…” Source: RevenueBase Database · checked Sep 28, 2026
5	L&s Consulting PTY LTD	Strong evidence	Johannesburg, South AfricaHQ checked Sep 28, 2026	51-200	26 contacts →
	Strong evidence “L&S Consulting (Pty) Ltd is involved in Structural and Civil Consulting Engineering, mainly for the private sector for industrial, retail and office developments.” Source: RevenueBase Database · checked Sep 28, 2026
6	Themba Consultants	Partial evidence	Johannesburg, South AfricaHQ checked Sep 28, 2026	11-50	24 contacts →
	Partial evidence “At Themba we provide professional consulting services in infrastructure development.” Source: RevenueBase Database · checked Sep 28, 2026
7	Gpwg Engineering	Partial evidence	Johannesburg, South AfricaHQ checked Sep 28, 2026	51-200	22 contacts →
	Partial evidence “GPWG Engineering is a multi-disciplinary Engineering Company with interests in Contracting activities (Civil, Electrical, Instrumentation, Solar and Mechanical) in the Mining…” Source: RevenueBase Database · checked Sep 28, 2026
8	Ipes Consulting Engineers	Partial evidence	Johannesburg, South AfricaHQ checked Sep 28, 2026	11-50	21 contacts →
	Partial evidence “Instrumented Process and Electrical Systems (IPES) was established as an independent engineering design house in 1988 in Johannesburg, South Africa.” Source: RevenueBase Database · checked Sep 28, 2026
9	Rasnco Consulting Engineers	Indirect evidence	Johannesburg, South AfricaHQ checked Sep 28, 2026	201-500	20 contacts →
	Indirect evidence “We at Rasnco Investments, are a vibrant and innovative company wholly owned by black Professionals, which was established at the beginning of 2017.” Source: RevenueBase Database · checked Sep 28, 2026
10	Optimult	Strong evidence	Johannesburg, South AfricaHQ checked Sep 28, 2026	11-50	18 contacts →
	Strong evidence “Optimult provides Consulting, EPC (Engineering, Procurement, Construction) and EPCM (Engineering, Procurement and Construction Management) services in a comprehensive range of…” Source: RevenueBase Database · checked Sep 28, 2026
11	ADA Consulting Engineers	Strong evidence	Johannesburg, South AfricaHQ checked Sep 28, 2026	11-50	18 contacts →
	Strong evidence “ADA Consulting Engineers offers professional consulting engineering services to clients in the development of industrial, commercial and public projects in the civil and…” Source: RevenueBase Database · checked Sep 28, 2026
12	Blackhead Consulting	Strong evidence	Johannesburg, South AfricaHQ checked Sep 28, 2026	11-50	13 contacts →
	Strong evidence “Blackhead Consulting (Pty) Ltd, established in 2004, is a black owned and managed consulting company that provides professional services in the engineering and project management…” Source: RevenueBase Database · checked Sep 28, 2026
13	Beyond Infradev PTY LTD	Partial evidence	Johannesburg, South AfricaHQ checked Sep 28, 2026	11-50	13 contacts →
	Partial evidence “Beyond Infradev (Pty) Ltd is a multi-disciplinary engineering and consultancy firm offering turnkey/EPC (Engineering, Procurement & Construction) life-cycle services for…” Source: RevenueBase Database · checked Sep 28, 2026
14	Projects And Industrial Engineering	Strong evidence	Johannesburg, South AfricaHQ checked Sep 28, 2026	11-50	11 contacts →
	Strong evidence “Projects & Industrial Engineering is an ISO 9001:2008 accredited professional South African multidisciplinary consulting engineering, design and project Management Company.” Source: RevenueBase Database · checked Sep 28, 2026
15	Shuma Africa	Strong evidence	Johannesburg, South AfricaHQ checked Sep 28, 2026	11-50	10 contacts →
	Strong evidence “Shuma Africa Projects is a South African Consulting Engineering firm.” Source: RevenueBase Database · checked Sep 28, 2026
16	Sydwalt PTY LTD	Strong evidence	Johannesburg, South AfricaHQ checked Sep 28, 2026	11-50	10 contacts →
	Strong evidence “SYDWALT (Pty) Ltd is an independent engineering Consulting firm, offering a broad range of professional services.” Source: RevenueBase Database · checked Sep 28, 2026
17	Aqua Earth	Indirect evidence	Johannesburg, South AfricaHQ checked Sep 28, 2026	11-50	8 contacts →
	Indirect evidence “Aqua Earth celebrates more than 20 years of operation and prides itself on having a dynamic team of specialists in Hydrogeology, also identified as Groundwater, as well as…” Source: RevenueBase Database · checked Sep 28, 2026
18	Carlisle & Associates	Partial evidence	Johannesburg, South AfricaHQ checked Sep 28, 2026	1-10	8 contacts →
	Partial evidence “Carlisle & Associates is a civil and structural engineering consultancy based in Johannesburg, South Africa.” Source: RevenueBase Database · checked Sep 28, 2026
19	Africa-One Consulting	Strong evidence	Johannesburg, South AfricaHQ checked Sep 28, 2026	11-50	8 contacts →
	Strong evidence “Africa-One Consulting and Research Pty Ltd trading as Africa-One Consulting was formed with initial focus on electrical engineering technology consulting with a vision to later…” Source: RevenueBase Database · checked Sep 28, 2026
20	Watson Consulting Engineers PTY LTD	Partial evidence	Johannesburg, South AfricaHQ checked Sep 28, 2026	11-50	7 contacts →
	Partial evidence “Engineering Excellence Our cutting-edge projects are carried out by a team of talented engineers who want to transform our communities.” Source: RevenueBase Database · checked Sep 28, 2026
21	Asande Projects Consulting And Engineering PTY LTD	Indirect evidence	Johannesburg, South AfricaHQ checked Sep 28, 2026	51-200	7 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 28, 2026
22	Rosnovanu & Associates	Partial evidence	Johannesburg, South AfricaHQ checked Sep 28, 2026	1-10	6 contacts →
	Partial evidence “Consulting Civil & Structural Engineers specialising in: Factories and Warehouses Apartment building developments Reinforced concrete Houses & residential projects Roads &…” Source: RevenueBase Database · checked Sep 28, 2026
23	Synlec PTY LTD	Strong evidence	Johannesburg, South AfricaHQ checked Sep 28, 2026	1-10	6 contacts →
	Strong evidence “Electrical engineering consulting.” Source: RevenueBase Database · checked Sep 28, 2026
24	Kwantu Professional Services PTY LTD	Strong evidence	Johannesburg, South AfricaHQ checked Sep 28, 2026	1-10	5 contacts →
	Strong evidence “Kwantu Professional Services provides consulting and engineering excellence with the broader goal of enhancing communities.” Source: RevenueBase Database · checked Sep 28, 2026
25	Thuthukani Electrical Control & Instrumentation PTY LTD	Strong evidence	Johannesburg, South AfricaHQ checked Sep 28, 2026	1-10	5 contacts →
	Strong evidence “Thuthukani Electrical Control & Instrumentation provides Electrical, Control & Instrumentation Engineering consulting and project management experience, a broad knowledge base…” Source: RevenueBase Database · checked Sep 28, 2026

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: hydro engineering and consulting firms. 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 hydro engineering and consulting firms.
Partial evidence: Its own public description names part of hydro engineering and consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name hydro engineering and consulting firms. 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 25 of 88 hydro engineering and consulting firms based in Johannesburg, South Africa

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Hydro engineering and consulting firms based in Johannesburg, South Africa at a glance

As of Sep 28, 2026

37.8%Verified-email coverage

22.8Average contacts per company

11-50Median size (employees)

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

Email recency for this list is measured across the whole South Africa list rather than for Johannesburg, so it is reported there. Company counts and contact totals on this page are exact for Johannesburg, over 88 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 hydro engineering and consulting firms, 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 Johannesburg, South Africa whose own description of what they do matches “hydro engineering and consulting firms”. 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 hydro engineering and consulting firms), 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 hydro engineering and consulting firms, and records with no verified work email. Companies headquartered outside Johannesburg 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, 759 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 28, 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.

Hydro engineering and consulting firms by metro in South Africa

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 hydro engineering and consulting firms, 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 hydro engineering and consulting firms are there based in Johannesburg, South Africa?

RevenueBase identified 88 hydro engineering and consulting firms headquartered in Johannesburg, South Africa 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?

WSP In Africa, headquartered in Johannesburg, tops this list with the largest team on record.

Which city in South Africa has the most hydro engineering and consulting firms?

Johannesburg leads South Africa with 88 headquartered companies, followed by Pretoria (65) and Cape Town (54).

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 759 verified decision-maker contacts tracked across these 88 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 28, 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.