About The Role

We're excited to expand our Engineering division with Commissioning Engineer Apprentice to join our Professional Development Programme for our 2026 intake, based in (Sussex/Kent/Hampshire) in Southern Water (CMDP) Framework working amongst our Commissioning specialists.

Why Choose MWH?

It's your career lets shape it together! We pride ourselves on putting people first with an inclusive and rewarding culture where success is recognised. Dedicated to attracting, retaining and enabling the development of our apprentices to maximise potential. The Apprentice programme is tailored to your needs with a flexible and varied learning environment, you'll feel empowered to make decisions and harness your knowledge and practical skills. The sky's the limit!

Grow with us! As a growing company within the RSK group, we can offer a multitude of opportunities. MWH Treatment is preparing to play its part as one of the UK's leading Design and Build Contractors in the Water Industry. In response to the growing demand to improve further the UK water quality in our rivers and bathing waters amongst other challenges, the investment in the water industry is far exceeding any other time. MWH Treatment, as part of the RSK group, specialise in creating and providing practical, sustainable outcomes. Our engineers pioneer and perfect solutions. The variety of work we offer provides a platform for you to develop and master your subject to build a fruitful and purposeful career.

What will you be doing?

As a Commissioning Engineer Apprentice at CMDP, you will be gaining first-hand experience in a diverse and dynamic environment. Working at CMDP offers a unique opportunity to be part of projects that not only advance technological frontiers but also ensure the safety and sustainability of the Water supply and wastewater management treatment.

You will be supported throughout your apprenticeship by your local team and line manager, and you will be given time to carry out your studies with the provider etc. Your on-the-job training will be in line with the work available on site but will afford the opportunity to ensure that you are given on site experience required to meet the technical and competency levels in order to achieve your apprenticeship goals.

Working within the Commissioning team you will be an integral part of the delivery of many projects by providing assistance in the following;

• You will work alongside specialist commissioning engineers, learning and increasing your knowledge. and understanding and gaining real hands-on experience in an engineering environment.
• Taking part in Factory Acceptance Testing, Setting to Work Activities and observing Site Acceptance Tests representing the principal contractor.
• Input to commissioning documentation including reviewing FAT, STW and SAT and other commissioning documentation, including Commissioning & Acceptance plans, and Reservations.
• Take part in contractor meeting with a view to actively leading these with support from your colleagues.
• Identification of technical solutions to problems encountered on site and supporting the delivery of these.
• Actively manage and record CPD from on-the-job training and any external learning, in order to provide robust evidence for professional registration/membership and SQEP.

What is the Apprentice Programme?

We know our continuing success and development depends on yours, so we go all the way when it comes to giving you the support you need to be the very best. You can expect the following;

• A committed and structured learning programme, with regular assessments.
• Academic day release for attendance at a local college to achieve a Level 3 qualification in your chosen topic.
• A mentor dedicated to you to support and guide your development.
• Opportunity to work on diverse projects where you can make a real difference to the world we live in.
• Continuous improvement and professional development.
• Practical, on the job training within your team of industry experts.

About You

What's in it for me?

Along with of structured learning and development throughout your graduate scheme and beyond, MWH also offer a variety of benefits, such as;
• A competitive starting salary
• 6 monthly salary increases, rewarding your commitment to your development and training
• 25 days holiday + Bank Holidays (with an additional 5 days available to buy)
• Some flexibility with hybrid working
• Competitive and flexible contribution pension scheme
• Private medical insurance
• Gym memberships
• Technology salary sacrifice scheme
• Cycle to Work scheme
• Employee Assistance Scheme - free mental health support, financial advice
• And many more benefits including Sports and Social club membership

What will I need to be considered?

• GCSEs for English, Mathematics and Sciences at grade 4 or above.
• Eligible to work in the UK
• Have the ability to travel to the office and sites (some of our sites are difficult to access through public transport) A driving licence would be preferred.
• Flexibility - Successful candidates will need to be flexible and willing to spend time in other offices and sites.
• Great communication skills. (Written and Verbal)
• Self- motivated - attitude is key, it's your career!
• A team player

What happens next?

Apply - Our dedicated early careers recruiter will review your application and be in touch

Timeframe - Within 4 Weeks you will hear if you've been successful to the next stage

Process - You will be invited to attend one of our onsite locations, for an assessment centre, where you will have the chance to meet the team and discover a little bit more about the role and the company!

Application Deadline - March 20th 2026

About Us

MWH Treatment is an integrated design and build provider working in the water sector. With over 1400 staff working across eight regional centres, supporting six long-term water sector frameworks and two recently won frameworks, operating both as a sole contractor but also in joint ventures and alliances.

At MWH Treatment we believe that people matter. We know to build successful, creative teams we need a diverse workforce that can deliver innovative ways of thinking. We provide an environment where you will have the freedom to develop and grow to your full potential, creating opportunity by inviting, embracing, and celebrating difference, our goal as an employer is to motivate, and develop our employees. By fostering a diverse range of talents and perspectives we ensure we have the breadth of viewpoints, experiences, and skills needed to succeed. Embracing diversity of all kinds enables us to provide a work environment and culture that plays a key role in attracting and retaining the right people with the right skills.

As signatories to the Armed Forces Corporate Covenant, we have made a promise to support our forces, working with the CTP to help ex veterans find work in the civilian world. We also support Mates in Mind, a charitable programme to improve and promote positive mental health in the workplace. We don't just tick boxes; we live these values every day.

What MWH offer

Packages include -

A competitive salary

Hybrid Working (Jobs needs dependent)

Car/car allowance (Jobs needs dependent)

25 days holiday + Bank Holidays (with an additional 5 days available to buy)

Contribution Pension scheme

Life Assurance

Health Insurance

Private Medical Insurance

And many more benefits including - cycle to work scheme, discounts and savings Hub, Kids Pass etc