Senior Water Quality Modeller

Let’s transform society together…

We’re Sweco.

We’re future planners, city shapers, urban innovators, digital transformers, net zero chasers, community connectors, social enterprisers and lifestyle improvers.

We’re difference makers.

We’re Europe’s leading design, engineering, environment and regulatory consultancy and we’re now recruiting for a Senior Water Quality Modeller to join our Water team in Bristol. This role can be worked flexibly with a minimum of 3 days per week in the office and the option of adjusted start and finish times.

As part of the Water team, you’ll promote the sustainable management of water resources, helping to protect the water environment and make people and places safer and more resilient to flood risk and climate change. In this role, you’ll play a key part in supporting water companies through AMP8 and beyond, addressing critical challenges around water quality, storm overflows and environmental compliance.

As a senior member of the team, you’ll provide technical leadership in Urban Pollution Modelling, working collaboratively with clients, regulators and multidisciplinary teams to deliver sustainable, innovative and practical solutions with real environmental impact. We’ll support you in developing your technical expertise so that you can become a real Difference Maker at Sweco.

What does the role involve?

• Developing, calibrating, auditing and interpreting models to assess water quality performance within sewerage catchments and receiving waters
• Undertaking Urban Pollution Modelling (UPM) studies to identify, assess and investigate water quality failures and compliance risks
• Developing and appraising improvement options to address identified water quality issues, including CSOs and intermittent discharges
• Providing technical assurance and peer review of modelling outputs, reports and proposed improvement options
• Advising on the selection and application of appropriate modelling tools and techniques, including SIMCAT, SAGIS, InfoWorks ICM, MIKE and GIS
• Producing Water Framework Directive (WFD) compliance assessments to support environmental assessments and regulatory submissions
• Designing, modelling and supporting the delivery of Natural Flood Management (NFM) measures where appropriate
• Preparing technical reports and environmental and water quality impact assessments

To be successful in this role you'll:

• Have significant experience in water quality and hydrology applied to a range of projects.
• Have a degree or equivalent in a relevant subject including geography, engineering, environmental sciences or maths.
• Strong knowledge and experience of standard hydrological and water quality modelling software and environmental assessment tools.
• Demonstrate ability to lead and manage projects, working within agreed deliverables, key milestones, project methodology, quality assurance and control strategy.
• Knowledge of Flood Risk Assessment, Natural Flood Management and Sustainable Drainage (SuDs) techniques.
• Working towards or hold chartered status from an appropriate institution (C.Eng or C.WEM).

What’s in it for you?

This is an exciting time to join Sweco and if you want to be part of a company who is small in all the best ways but large enough to provide a diverse and exciting workload, this job is for you

You will learn from experienced people who share a passion for working together with our clients to deliver technical excellence.

If you believe you have the skill set required, are keen to join a business with genuine opportunities for career progression, then we’d love to hear from you.

Let’s transform society together at Sweco!

Employee Benefits

• Flexible and hybrid working (Flexworks Policy)
• Competitive pension contribution
• Life Assurance
• Private Medical Insurance
• Discretionary Annual Bonus Scheme
• Payment of two relevant professional subscriptions
• 25 days holiday plus bank holidays (with the option to purchase up to 5 additional days per year)
• Cycle2Work Scheme
• Employee Assistance Programme (wellbeing, mental health, financial and work advice)
• Employee discounts via Sweco Benefit Select (Faircare)
• Salary Sacrifice Electric Vehicle Scheme
• We plant a tree for all new starters!

Equality, Diversity & Inclusion

It’s important to us that that all our colleagues thrive at work - we strive to have a friendly and inclusive culture which respects the contribution individuals can bring to Sweco. We aim to promote equality, inclusivity and diversity for everyone.

Here at Sweco we positively encourage applications from suitably qualified and eligible candidates regardless of sex, race, disability, age, sexual orientation, gender reassignment, religion or belief, marital status, pregnancy or maternity/paternity.

We have signed the Armed Forces Covenant to ensure those who serve or have served, and their families, are treated fairly. To find out more The Armed Forces Covenant - Our Commitments | Sweco UK.

We are an accredited Real Living Wage Employer which reflects our commitment to fair pay and support for all colleagues.

We are also proud to be a Disability Confident Committed employer, and will interview applicants covered by the Equality Act 2010 that opt into the guaranteed interview scheme on the application form and meet the minimum criteria for the role.

If I have a disability, can I get help (e.g. “reasonable adjustments”) with the application process?

If you’re an applicant with a disability that requires a reasonable accommodation to complete any part of the application process or are limited in the ability or unable to use the online application system and need an alternative method for applying, please contact GB_Function-HR-Resourcing@sweco.co.uk for assistance.

In order to address your request the following information is needed:

• Name

• The best method for contacting you (Phone or email)

• The position title

• Requisition/vacancy number

Upon receipt of this information, we’ll respond to you promptly to obtain more information about your request.

Please note: we reserve the right to close vacancies before the advertised closing date.

Sweco UK&I have an internal resourcing team who are responsible for all recruiting activity. We have a Preferred Supplier List of trusted agencies who we work with on those “hard to fill” roles.

We have defined processes for recruitment applications and it is company policy not to accept speculative CVs. Any speculative CVs received into the business (whether to a manager or member of the resourcing team) will become the property of Sweco and the agency will not be eligible for an introductory fee.

Our Preferred Supplier List was reviewed in November 2025 and we are not looking to add any additional agencies. We’ll be reviewing the PSL again at the end of 2026 and non-compliance with the above statements could be detrimental to you having the opportunity to be included.

Our Talent Community for experienced professionals is a great way to keep up to date with our latest news, insights, future vacancies, as well as gaining access to exclusive events hosted by our experts.

To learn more Join Our Talent Community - Sweco United Kingdom