CSL Assurance Supervisor

Job title CSL Assurance Supervisor  Division Retail Location Hybrid - Field Based Contract type Permanent Full/Part-time Full-time Hours 36 hours per week Salary A competitive salary starting of £46,000 per annum Job grade B Closing date 16/02/2026

Thames Water is looking for a proactive, quality‑driven CSL Assurance Supervisor to play a key role in delivering an exceptional Customer Side Leakage (CSL) service. If you’re motivated by problem‑solving, field supervision, and making a real difference to customer experience, this is an opportunity to shape how we protect our network and support our communities.

What you’ll be doing as the CSL Assurance Supervisor

You’ll be the vital link between our service delivery teams across London and the Thames Valley, field repair partners, and our customers, ensuring all planned and reactive work is completed safely, efficiently, and to the highest standards. Every day will bring variety as you support field teams on the ground, drive quality, and keep customers informed and reassured.

Key Responsibilities

• Attend sites to support repair gangs and ensure effective delivery.
• Provide hands‑on supervision and technical guidance for complex or high‑visibility leaks.
• Maintain live contact with repair partners to monitor progress in real time.
• Attend customer site visits, helping to build trust and keep communication clear.
• Proactively remove blockers to keep repairs moving smoothly.

Planned Work Management

• Review upcoming planned works and guide decisions on scheduling and prioritisation.
• Help clear blockers such as permits, access challenges, customer availability, or materials.
• Carry out site visits for complex repairs to assess methods and agree best‑fit solutions.
• Work closely with the Service Delivery Team to track performance and ensure timely delivery.

Audits & Compliance

• Complete a minimum of four high‑quality site audits each month.
• Ensure every audit covers essential H&S, water quality, and workmanship standards.
• Identify and resolve non‑compliance issues quickly, escalating where needed.
• Support ongoing reporting to highlight trends and drive continuous improvement.

Abort & Attrition Performance

• Help monitor abort and attrition levels across repair partners.
• Assist in live situations where abort risks appear, escalating as appropriate.
• Share insights and data with partners to reduce avoidable aborts.
• Improve outcomes through proactive planning and consistent on‑site presence.
• Minimum of four compliant site audits per month, with full evidence.
• Active, consistent engagement with repair teams and customers.
• Ongoing compliance with H&S, water quality, and workmanship expectations.
• Reduction in abort and attrition rates through effective supervision and planning.

What you should bring to the role

• Demonstrable experience working within a CSL operation is essential, including hands‑on operational understanding of how CSL repairs are delivered in the field, and the practical problem‑solving required to complete jobs where access, customer or technical challenges arise.
• Experience in a supervisory or field‑based role within the water industry.
• Strong understanding of leakage repair, reinstatement, and network operations.
• Excellent working knowledge of H&S, NRSWA, and water hygiene standards.
• Confident communicator able to liaise with customers, repair partners, and internal teams, with the
• Ability to assess issues on site and make sound, quick decisions.
• Competent IT skills for reporting and updating systems accurately.

Location:

Hybrid - Field Based - Base Location Maple Lodge - Rickmansworth - WD3 9SQ

Hours:

36 hours per week

What's in it for you?

• A competitive salary starting of £46,000 per annum
• 26 days holiday per year, increasing to 30 days with the length of service. (plus bank holidays)
• Performance-related pay plan directly linked to company performance measures and targets.
• Generous Pension Scheme through AON.
• Access to lots of benefits to help you take care of you and your family’s health and wellbeing, and your finances – from annual health MOTs and access to physiotherapy and counselling, to Cycle to Work schemes, shopping vouchers and life assurance.

We’re the UK’s largest water and…