Hydro International is now proudly part of Tarmac, within the wider CRH Group — combining specialist wastewater engineering expertise with the scale, stability and long‑term opportunity of one of the UK’s leading construction materials businesses.
With over 40 years of engineering excellence, Hydro International provides advanced water and wastewater solutions that help municipal and industrial customers improve performance, reduce environmental impact and protect communities from flooding and pollution.
Operating in more than 40 countries and supported by an international distribution network, Hydro plays a key role within CRH Infrastructure Products, leading the sector with innovative, sustainable and safety‑first solutions.
This role sits within our UK Wastewater Services (UKWWS) team, supporting water utility companies by upgrading and improving sewage treatment sites across the UK.
The Role
We are looking for an experienced and qualified Mechanical Engineer to join our Dumfries‑based team.
This is a hands‑on, site‑based role where you’ll work on wastewater treatment sites across the UK, installing, commissioning and maintaining specialist water filtration and mechanical systems. The role involves regular working away from home, including overnight stays, and occasional work within Hydro workshops nationwide.
If you enjoy practical engineering work, problem‑solving on site and travelling as part of a close‑knit engineering team, this role offers real variety and long‑term career potential.
What You’ll Be Doing
Installing, commissioning, setting up and testing water filtration and mechanical systems on wastewater and sewage treatment sites
Carrying out site inspections, fault‑finding and surveys to support quotation and project planning
Accessing and interpreting technical instructions using mobile electronic devices
Working at height, in confined spaces and outdoors on active wastewater sites
Working away from home regularly, including overnight stays
Supporting work in Hydro workshops across the UK when required
Working collaboratively with engineers, technicians and other trades across the business
Maintaining a strong focus on safety, quality and compliance at all times
About You
You’ll be an experienced mechanical engineer who brings:
A current, valid UK driving licence
City & Guilds qualification (or equivalent)
Completion of a recognised mechanical apprenticeship
Experience working in industrial, utilities or heavy engineering environments
Willingness to work outdoors, in confined spaces and at height
A flexible approach to working away from home
Why Join Us?
As part of Tarmac and the CRH Group, you’ll benefit from secure, long‑term employment, strong safety standards and the opportunity to build a lasting engineering career.
Our benefits include:
Competitive salary
Discretionary annual bonus
Overnight subsistence allowance
Additional stay‑away payments
Life assurance – 2× annual salary
Pension scheme with employer contribution
Company sick pay
Minimum 23 days’ holiday plus bank holidays
Flu vaccinations
DSE eye tests
Mental Health First Aiders and wellbeing support
Ongoing training, qualifications and development opportunities
Clear opportunities for progression and advancement
What Hydro International (Part of Tarmac) Offers You
A culture that values development, progression and internal promotion
Investment in engineering capability and professional qualifications
Opportunities to progress within Hydro, Tarmac and the wider CRH Group
The chance to work on essential UK infrastructure where your skills make a real differenceTarmac is committed to being a Forces‑friendly employer.If you’re coming from a military background, we’ll support your transition and help you build a successful career with us.
We’re proud to be part of CRH, and even prouder to be an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for everyone.If you need any reasonable adjustments during the recruitment process, just let us know, we’re here to support you.
Ready to build your future?
Click ‘Apply’ to get started. Please note: we sometimes close roles early due to high interest, so don’t wait too long!
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Tarmac Trading Limited