Company lists · Data refreshed September 2026

Top 25 Wastewater engineering and design firms based in Australia

Name: Wastewater engineering and design firms based in Australia
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 350 companies tracked

RevenueBase identified 350 wastewater engineering and design firms headquartered in Australia as of September 2026 and tracks 5,712 professional contacts across them, including 3,042 with verified work emails. Sydney is the largest hub.

This list covers wastewater engineering and design firms headquartered in Australia, 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 19, 2026 86% judged on-target in blind review

350Companies

5,712Contacts tracked

3,042Verified emails

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The 25 largest wastewater engineering and design firms based in Australia

Ranked by team size

Top 25 of 350 wastewater engineering and design firms based in Australia, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to wastewater engineering and design 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	Cardno	Indirect evidence	Fortitude Valley, AustraliaHQ checked Sep 19, 2026	1,001-5,000	985 contacts →
	Indirect evidence “Cardno is now officially Stantec.” Source: RevenueBase Database · checked Sep 19, 2026
2	GPA Engineering	Partial evidence	Unley, AustraliaHQ checked Sep 19, 2026	201-500	346 contacts →
	Partial evidence “A highly experienced, multidisciplinary engineering and management firm, GPA has consulted and provided engineering, procurement and construction management (EPCM) services, since…” Source: RevenueBase Database · checked Sep 19, 2026
3	Enviropacific	Indirect evidence	Macquarie Park, AustraliaHQ checked Sep 19, 2026	201-500	260 contacts →
	Indirect evidence “Enviropacific is committed to working towards creating safer environments and sustainable communities.” Source: RevenueBase Database · checked Sep 19, 2026
4	Tonkin	Partial evidence	Adelaide, AustraliaHQ checked Sep 19, 2026	201-500	237 contacts →
	Partial evidence “Tonkin is a leading provider of engineering, environmental and consultancy services to private and public organisations.” Source: RevenueBase Database · checked Sep 19, 2026
5	Trility	Partial evidence	Adelaide, AustraliaHQ checked Sep 19, 2026	201-500	217 contacts →
	Partial evidence “Company Overview: TRILITY is an established industry leader, dedicated in the delivery of water, wastewater, reuse and bio-solids solutions across Australia and New Zealand’s…” Source: RevenueBase Database · checked Sep 19, 2026
6	Aquatec	Partial evidence	Shepparton, AustraliaHQ checked Sep 19, 2026	51-200	177 contacts →
	Partial evidence “Aquatec partners with Government, business and residential clients to deliver water, wastewater and odour control solutions for the long-term.” Source: RevenueBase Database · checked Sep 19, 2026
7	Atlan Stormwater	Partial evidence	Sydney Olympic Park, AustraliaHQ checked Sep 19, 2026	201-500	147 contacts →
	Partial evidence “At Atlan Stormwater, we draw on more than 45 years’ experience in the design, testing and manufacture of water treatment systems that are utilised in over 45 countries.” Source: RevenueBase Database · checked Sep 19, 2026
8	Guidera O'connor	Partial evidence	Thebarton, AustraliaHQ checked Sep 19, 2026	51-200	137 contacts →
	Partial evidence “Guidera O'Connor (GO) is an Australian privately owned company operating only within the Water Industry and specialising in the delivery of water/wastewater treatment and pumping…” Source: RevenueBase Database · checked Sep 19, 2026
9	Burchills Engineering Solutions	Partial evidence	South East Queensland, AustraliaHQ checked Sep 19, 2026	51-200	98 contacts →
	Partial evidence “Burchills Engineering Solutions is a South East Qld based, locally owned multidisciplinary team of professional engineers & scientists with a track record of helping clients…” Source: RevenueBase Database · checked Sep 19, 2026
10	Hydroflux PTY LTD	Partial evidence	Sydney, AustraliaHQ checked Sep 19, 2026	51-200	95 contacts →
	Partial evidence “Water l Science l Technology The Hydroflux Group is a team of water and wastewater treatment experts harnessing the power of world leading research and technologies for a more…” Source: RevenueBase Database · checked Sep 19, 2026
11	CMP Consulting Group	Strong evidence	Mulgrave, AustraliaHQ checked Sep 19, 2026	51-200	94 contacts →
	Strong evidence “CMP Consulting Group is a multi-disciplinary Engineering firm specialising in design, project management and construction phase services for the Water Industry.” Source: RevenueBase Database · checked Sep 19, 2026
12	Hunter H2o	Indirect evidence	Mayfield West, AustraliaHQ checked Sep 19, 2026	51-200	93 contacts →
	Indirect evidence “Beca HunterH2O is a diverse, empowered, and trusted team of 300+ water specialists, passionate about healthy and sustainable communities wherever we work.” Source: RevenueBase Database · checked Sep 19, 2026
13	PPS Group	Indirect evidence	Perth, AustraliaHQ checked Sep 19, 2026	201-500	81 contacts →
	Indirect evidence “PPS Water Group is a proudly Australian company delivering turnkey water infrastructure solutions to the resource sector and beyond.” Source: RevenueBase Database · checked Sep 19, 2026
14	Bligh Tanner	Partial evidence	Fortitude Valley, AustraliaHQ checked Sep 19, 2026	51-200	69 contacts →
	Partial evidence “With offices in Brisbane and Sydney, Bligh Tanner is a structural, façade, civil, environmental and water engineering consultancy distinguished by its high level of expertise…” Source: RevenueBase Database · checked Sep 19, 2026
15	MAK Water	Partial evidence	Malaga, AustraliaHQ checked Sep 19, 2026	51-200	69 contacts →
	Partial evidence “At MAK Water, we help clients achieve reliable, cost-effective and sustainable water, wastewater and sewage treatment solutions.” Source: RevenueBase Database · checked Sep 19, 2026
16	Witthoft Engineering	Partial evidence	Fortitude Valley, AustraliaHQ checked Sep 19, 2026	51-200	65 contacts →
	Partial evidence “Witthoft Engineering Pty Ltd is an engineering consultancy company based in Brisbane, Australia, which specialises in electrical, instrumentation, industrial control system…” Source: RevenueBase Database · checked Sep 19, 2026
17	Saunders Aqua Metro	Partial evidence	Mulgrave, AustraliaHQ checked Sep 19, 2026	501-1,000	62 contacts →
	Partial evidence “In 2025, Aqua Metro was acquired by Saunders (ASX:SND)- a leading Australian engineering, construction and industrial services company delivering multidisciplinary solutions…” Source: RevenueBase Database · checked Sep 19, 2026
18	Spirac	Partial evidence	Bibra Lake, AustraliaHQ checked Sep 19, 2026	51-200	62 contacts →
	Partial evidence “SPIRAC PROVIDES SOLIDS HANDLING SOLUTIONS FOR MUNICIPAL WASTEWATER AND INDUSTRIAL APPLICATIONS Municipal screening, grit and sludge handling solutions are our primary focus, but…” Source: RevenueBase Database · checked Sep 19, 2026
19	Triaxial Consulting	Partial evidence	Sydney, AustraliaHQ checked Sep 19, 2026	51-200	57 contacts →
	Partial evidence “Established in 2012, Triaxial Consulting are a firm of Consulting Civil and Structural Engineers, who provide a suite of specialist consulting engineering services, to all…” Source: RevenueBase Database · checked Sep 19, 2026
20	Atlas Engineering Group	Partial evidence	North Sydney, AustraliaHQ checked Sep 19, 2026	51-200	51 contacts →
	Partial evidence “Atlas, now part of the Sequana Group, has been specialising in brownfield water & wastewater programs and projects from day one.” Source: RevenueBase Database · checked Sep 19, 2026
21	WRM Water & Environment PTY LTD	Partial evidence	Brisbane City, AustraliaHQ checked Sep 19, 2026	11-50	47 contacts →
	Partial evidence “WRM Water & Environment is a world-class consultancy specialising in flooding, water resource engineering and water management.” Source: RevenueBase Database · checked Sep 19, 2026
22	The Environmental Group Limited	Partial evidence	Mount Waverley, AustraliaHQ checked Sep 19, 2026	201-500	44 contacts →
	Partial evidence “Engineering a Sustainable Future The Environmental Group Limited is an environmental engineering company that provides products and engineering services to various industries to…” Source: RevenueBase Database · checked Sep 19, 2026
23	Sellick Consultants PTY LTD	Strong evidence	Braddon, AustraliaHQ checked Sep 19, 2026	11-50	40 contacts →
	Strong evidence “Sellick Consultants is an award winning, multi-disciplinary engineering consulting firm offering superior design skills in the fields of structural, civil and hydraulic…” Source: RevenueBase Database · checked Sep 19, 2026
24	Wsce Warren Smith Consulting Engineers	Partial evidence	Sydney, AustraliaHQ checked Sep 19, 2026	51-200	40 contacts →
	Partial evidence “WSce is a multi-discipline Australian-owned consulting engineering firm specialising in civil, water, hydraulic, fire services (wet & dry fire) and specialty water and wasterwater…” Source: RevenueBase Database · checked Sep 19, 2026
25	Sparks Partners Consulting Engineers	Partial evidence	Parramatta, AustraliaHQ checked Sep 19, 2026	11-50	39 contacts →
	Partial evidence “Established more than 30-years ago, Sparks+Partners Consulting Engineers has a rich history and expertise in quality engineering.” Source: RevenueBase Database · checked Sep 19, 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: wastewater engineering and design 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 wastewater engineering and design firms.
Partial evidence: Its own public description names part of wastewater engineering and design firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name wastewater engineering and design 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 350 wastewater engineering and design firms based in Australia

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Wastewater engineering and design firms based in Australia at a glance

As of Sep 19, 2026

53.3%Verified-email coverage

16.3Average contacts per company

1-10Median size (employees)

11.4%Largest-city concentration · Sydney

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

198

11-50

108

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured worldwide rather than for Australia, so it is reported there. Company counts and contact totals on this page are exact for Australia, over 350 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 wastewater engineering and design 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 Australia whose own description of what they do matches “wastewater engineering and design 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 wastewater engineering and design 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 wastewater engineering and design firms, and records with no verified work email. Companies headquartered outside Australia 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, 3,042 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.

Wastewater engineering and design firms by metro

Wastewater engineering and design firms in Sydney40

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 wastewater engineering and design 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 wastewater engineering and design firms are there based in Australia?

RevenueBase identified 350 wastewater engineering and design firms headquartered in Australia 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?

Cardno, headquartered in Fortitude Valley, tops this list with the largest team on record.

Which city has the most wastewater engineering and design firms?

Sydney leads with 40 headquartered companies, followed by Melbourne (23) and Perth (10).

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 3,042 verified decision-maker contacts tracked across these 350 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.