Serving parts of North West London and the Home Counties.


Our Water Resources

 Last Update: 4 January 2018


Current levels: Low


Following a dry winter in 2016/17, our groundwater resources remained below average for the whole of last year. Over the last three months, a little over 50% of the long-term average rainfall has meant that groundwater supplies, which are used to supply water, are now low.

Aquifers only fill up from rainfall during autumn and winter, when there is less plant growth and evaporation. October to March is the critical recharge period when rainfall is expected to reach the aquifers (porous rock where groundwater is stored), which are used for 60% of supplies.

Even with the wet December, recharge of the aquifers was, in some areas, only 24% of the long-term average. This is because the soil was so dry, following below average rainfall in October and November, that most of the water did not reach the aquifer.

Rainfall will need to be significantly above average in January, February and March to reduce the likelihood of water restrictions later this year.


Groundwater levels

Here is a diagram showing our current groundwater levels.

Groundwater levels 


Rainfall levels

Here is a graph showing the average v long term average rainfall for the past year.

Rainfall Graph


What we're doing

We are managing the situation by taking a range of measures, including:

  • Investing even more in our network, including achieving the highest leakage reduction targets in the water industry

  • Regular meetings with our Drought Management Group (DMG) in accordance with our Drought Management Plan (DMP)

  • Working in partnership with other water companies and the Environment Agency

  • Resting groundwater sources so that they can be used if the situation worsens further

  • Voluntarily reducing abstraction in certain catchments where environmental triggers are reached

  • We are continuing with our ‘Keep track of the tap’ campaign to raise awareness and help people save water.


What we can all do to save water

With our water resources at low levels, we are continuing to ask our customers to help by saving water.

Doing a little saves a lot – these water saving tips really make a difference!



In the bathroom

  • Shorten your shower – take a 4-minute shower instead of a bath – you will save around 50 litres

  • Don’t overfill the bath – if you fancy a bath try using less water – it is easy to save over 30 litres each time

  • Turn off the tap while brushing your teeth, and save over 6,500 litres of water a year and encourage others to do the same

  • Whenever you can, use the half flush button if you have a dual flush toilet

  • A cistern displacement device can save one litre per flush, saving up to 5,000 litres a year.


In the kitchen

  • Save water and electricity by only boiling enough water for your immediate use

  • Use a bowl to wash dishes or vegetables

  • Fix dripping taps and you could save over 5,500 litres of water a year. If you need to find an approved plumber visit

  • If you are buying a new appliance look at the Eco-label for water and energy consumption

  • Only run your washing machine and dishwasher with a full load – this uses less water than two half loads.


For more information and FREE water saving devices, please visit