How does hot weather impact local water resources?

We’re seeing another hot summer, following on from the warmest and driest spring in more than 50 years. It’s expected that we’ll see more heatwaves due to climate change, as well as unpredictable rainfall and weather patterns.

This makes it more challenging to plan for the future and make sure we have enough water resources to meet demand. That’s why we look at a range of scenarios to ensure we can meet customer needs and protect the environment.

Changing weather patterns

The UK is seeing more extremes of heat. 2022 and 2023 are the second-hottest years on records dating back to 1884 and six of the ten hottest recorded years have been in the last decade.

The changing weather is also bringing differences in rainfall. Five of the 10 wettest years on record also occurred in the last 25 years, with rain becoming more intense and frequent. There is significant variation in rainfall between years.

Where your water comes from

Your drinking water supply relies on winter rainfall. Around 85% of the water used in this region is supplied by groundwater sources, which are recharged over the winter, usually between October and March.

The other 15% comes from Bough Beech Reservoir. We fill the reservoir from the River Eden between October and April when river flows are at their highest.

You can see regular updates on groundwater levels, rainfall and the level of Bough Beech Reservoir on our rainfall and resources webpage. You can also see a graph showing water demand and how it spikes upwards in summer months.

The impact of warm weather

On an average day, we supply 160 million litres of water to customers. On warm days, demand for water increases as people take more showers, water gardens, wash cars and get paddling pools out. In hot weather, daily water usage can reach up to 220 million litres per day. 

With higher demand for water, we need to take more from the natural environment and increase the volume of water processed at our treatment centres. This has an impact on nature and on the amount of energy used to treat water.

You can help to protect water reserves by being careful with water. Simple steps like choosing drought-resistant plants, swapping baths for quick showers and washing your car with a bucket and sponge instead of a hose make a big difference. See our water-saving webpage for more tips.