Serving parts of North West London and the Home Counties.


Our Water Resources

 Last Update: 12 April 2019

March rainfall welcome but water resources remain below average due to dry start to the year


We have welcomed the rainfall in March, which was over 137% of the long-term average and led to a slight increase in groundwater levels. However, the first two months of the new year were much drier than average in our central region and groundwater sources remain below average.

Groundwater is more likely to be replenished 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.

We are now heading into the spring and summer months and further recovery of groundwater sources past May is unlikely.

Whatever the weather brings, we have plans in place for a range of different rainfall scenarios over the next year and will continue to work with customers to help save water.


Rainfall and groundwater levels

Groundwater levels graph

*Note, this diagram represents rainfall and water levels in our central area. For groundwater levels in our east and southeast area, please click on the map below.

To learn more about where our water comes from, please visit



Learn more about the groundwater levels where you are

Click on the map below to see what the water levels are like where you live


Affinity Water Regions Map Central Region East Region Southeast Region


Keep track of the tap

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

  • Keep track of the tap logo

  • Don’t overfill the bath – if you do fancy a bath try and use less water in it – 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 in your household 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

We have more useful tips to save water and FREE water saving devices here >>


What we're doing

  • We are focused on fixing leaks, and achieved the highest leakage reduction target in the water industry. If you spot a leak you can report it here>>

  • We are investing in our network by replacing water mains to reduce the number of bursts and leaks.

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

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