United Utilities, water supplier to the North West of England, said its underlying first-half profit before tax rose 97.4% to £361 million for the six-month period to September 30, 2025.
It said underlying revenue rose 21% to £1.309 billion.
Interim dividend will rise 3.5% to 17.88p per ordinary share.
United Utilities CEO Louise Beardmore said: “We have achieved strong operational and financial performance in the first half of 2026, delivering for customers, communities, and the environment.
“Our transformative plan to invest over £13 billion in the North West over the next five years is on track with our supply chain fully mobilised, boosting economic growth and supporting 30,000 jobs across United Utilities and the supply chain.
“Our investment is delivering better environmental performance and improved infrastructure right across the region. Work is underway to deliver a new aqueduct safeguarding water supplies for over two million customers in Manchester, and we’re making good progress tackling spills from storm overflows.
“Despite a drier spring and early summer, the resilience of our team and our assets, together with the support of customers using water wisely, has helped us keep taps flowing and the environment protected.
“Our integrated network has allowed us to move water to where it is needed most, avoiding restrictions on water usage. On top of this, we remain focused on driving down leakage, with levels of find and fix 30% higher than this time last year.
“On storm overflows, we have a clear strategy of targeted interventions at hundreds of sites. Overall, spills are down c.40% year-to-date, around 10,000 of which are directly due to our actions. We’re making significant progress towards our long-term target of cutting them by 60% in the decade to 2030.
“We have been driving improvements for customers too: we are one of the few companies to have hit all targets on customer service; and have earned rewards across our regulator’s three key ‘customer experience’ measures.
“Recognising many households in the North West are facing financial challenges, we’ve doubled affordability support for customers, helping more than 400,000 customers with their bills this year.”