About MOSL

We are the market operator for the non-household water retail market in England, which opened in April 2017 enabling more than 1.2 million business customers to choose who supplies their retail water and wastewater services.

We sit at the centre of the market, with access to central market data, processing more than 90,000 transactions each day through the Central Market Operating System (CMOS).

We're responsible for the day-to-day smooth running of the market, enabling new companies to enter the market, customers to switch and settlement to take place. We also ensure that everyone involved is held to account for their performance in delivering the best possible service to business customers.

We also work with retailers, wholesalers, customers, and key stakeholders, such as the water regulator, Ofwat, to identify and implement ways to improve the market through our key improvement programmes.

Our purpose is to advance simple and effective water markets to unlock value and choice for customers.

Our vision is to use our collective expertise and independent insight to deliver the best customer outcomes.

We’re delivering on these through our four strategic priorities:

  • Market confidence – Be a trusted market operator that assures market performance and resilience
  • Market systems – Provide secure and efficient technology to meet future market needs
  • Water security – Drive data and information to enable the nonhousehold market to positively affect water consumption
  • Market evolution – influence policy and promote solutions to support a flourishing market

Our strategy can be viewed here.

You can find us in the White Building in the heart of Southampton. You can take a look at our office space in this video.

To note, this video has no meaningful audio content.

Awards and accreditations

MOSL has been shortlisted for four awards in the seven years its inception. These include winning Reward Gateway’s Most Creative Comms(SME) Award and Waterwise’s Checkmark for Offices. Colleagues working on behalf of MOSL have also been recognised for their contribution to the water industry.

Find out more about our awards, accreditations and recognition.

Related pages


Find out the latest news from MOSL.

View page


Find out what's happening at MOSL.

View page

Keep up to date

Receive the most relevant and up-to-date communications from MOSL by signing up to our mailing list.