Yorkshire Water Chief Nicola Shaw Quits a Day After One-Star Rating and 335 Pollution Incidents

The Yorkshire Water chief executive, Nicola Shaw, is stepping down just 24 hours after the Environment Agency (EA) downgraded the company to the lowest environmental rating available, a one-star classification reserved for poor performers.

The company announced the departure on Friday, saying Ms Shaw had decided to leave after four and a half years in charge. Nicola Medalova, a former National Grid executive, will join next week as chief executive-designate and formally take over in January. The timing makes the announcement hard to separate from the regulator’s verdict, though the company framed the change as an “orderly transition” rather than a response to it.

What the one-star rating means

On Thursday the EA said it had cut Yorkshire Water from two stars out of four to one. The company serves more than five million people across the region. According to the EA, it recorded 335 pollution incidents in 2025, 13 of them classed as serious. It was also fined a total of £1.2 million last year over pollution incidents.

The rating carries a practical penalty. Under rules introduced last year, any company rated one star is automatically barred from paying bonuses to its senior executives. Yorkshire Water is not alone: Southern Water, Thames Water and South West Water also received one-star ratings, so four of the water companies assessed now sit in the bottom tier.

A carefully worded exit

Ms Shaw acknowledged that “a huge amount of work” remains, but said the business is on “stronger footing for delivery across all aspects of its work”. She added that it “now feels like the right time to begin an orderly transition to the company’s next chapter.”

The sources do not say that Ms Shaw was pushed out, and nothing in the company’s statement links her decision directly to the EA’s announcement. What they do establish is the sequence: a damaging regulatory ruling one day, a leadership change the next.

Scrutiny over pay

Ms Shaw’s tenure also drew criticism over her remuneration. Payments to her worth £1.3 million between 2023 and 2025 were made through Kelda Holdings, a Jersey-incorporated company. Yorkshire Water stressed at the time that the money came from shareholders rather than bill payers. That distinction answers one question about who funded the pay, but it did little to quiet wider unease about executive reward at a company with a poor environmental record.

What the new leadership faces

Ms Medalova is arriving with a clear brief and a difficult starting position. She said Yorkshire Water “faces huge challenges but also great opportunities for continued improvement”, and promised a “relentless focus” on delivering “for customers, communities and the environment”. She will work alongside Ms Shaw during the handover period before taking full control.

The bonus ban shows how the new rules bite: a poor rating now has direct consequences for pay at the top. Whether the change at the top of Yorkshire Water translates into fewer pollution incidents is the real test, and the next EA assessment will show how far the company has moved from the bottom of the table.

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