About Thames21

Thames21 is a leading environmental charity, working across London and the Thames Basin to deliver high-impact nature-based solutions to the climate and biodiversity crisis through restoring rivers, whilst also connecting communities to their local green-blue spaces and inspiring long-term stewardship of them.

Diversity at Thames21

Equity, Diversity and Inclusion at Thames21 is key to our success and as such we employ staff from a diverse range of backgrounds, this we feel is key in ensuring that everybody has an equal opportunity and is not treated differently or discriminated against because of their characteristics. We value the voices of our individual employees, and we strive to work in a collaborative, innovative balanced way. The postholder must actively support this.

Purpose of the job

The successful candidate will be employed as part of the Evidence Team working in a supportive, dynamic and fast-moving environment. While the post is initially funded for 1 year, there is likely to be further funding to work on projects related to water quality monitoring/modelling and nature-based solutions beyond this date. The role is to lead delivery of various projects within the Evidence Program, working closely with a variety of project partners and focusing on evidencing water quality pollution issues, identifying opportunities for pollution mitigation using nature-based treatment solutions, and monitoring their effectiveness. Projects vary from local and national scale to international collaborations.

You will undertake water quality monitoring, co-ordinate networks of citizen scientists to monitor water quality, perform dataset analysis, perform water quality modelling, and provide advice and guidance on the best nature-based solutions. This job would suit somebody with experience in monitoring water quality and/or nature-based solutions, and working with volunteers.

Main Duties and Responsibilities

Support the delivery of various projects – including constructing work plans, achieving project milestones.
Routine maintenance of probes, water testing kits and other field equipment.
Data inputting, analysis, presentation and visualisation using a variety of software and online tools such as Excel, ArcGIS, QGIS.
Production of high impact verbal and written reports aimed at a range of expert and non-expert audiences.
Undertake surface water sampling and data collection, analysis and interpretation of results, desk-based studies and project reports and recommendations.
Coordinate stakeholders across projects and partnerships to implement/co-develop new tools/approaches to data and evidence analysis/modelling.
Method development and support of monitoring carried out by citizen scientists.
Delivery of other types of project work, as and when required by project or team managers.
Work outside in a riverside environment in a variety of weather conditions.
Work with Thames21 colleagues to develop and implement Thames21’s vision.

Other Duties

This job description cannot cover every issue or task that may arise within Thames21. At various times the post-holder will be directed to carry out other reasonable duties in support of other Thames21 activities that are consistent with those in this Job Description via this link EPO1225

For more information on Thames21, please visit our website at www.thames21.org.uk.

To apply for this position please, email an up-to-date copy of your CV and a covering letter to recruitment@thames21.org.uk with the reference EPO1225 in the subject box of your email application.

The closing date for applications is: 5pm 26th January 2026

Interview dates: Week commencing 9th February 2026 (subject to change)

We appreciate the time you will have taken to apply to this role, and we do appreciate that it is disconcerting when you don’t hear back from a role you have applied for. However, due to the high number of applications we expect to receive, we are unable respond to or give feedback on individual applications, but we do want to be able manage expectations. Therefore, if you do not hear from us within 4 weeks of the closing date, please assume that your application has not been successful on this occasion.

No agencies please

Evidence Project Officer