Serving parts of North West London and the Home Counties.

Groundwater levels

East Region


Central region water levels hydrograph

*The long term average (LTA) has been calculated statistically, using the long term data record for this hydrograph. The respective drought zones are used as operational triggers, and have been derived using the LTA.


Groundwater levels in the East region are currently in drought trigger zone 1, lower than at this point in 2018 and declining at a relatively gradual rate. Rainfall in June was relatively high (178% of LTA) and this has resulted in a gentling of the rate of decline since April. This has improved the groundwater prospects for the region and even under a low rainfall scenario (60% of the LTA), levels are forecast to remain in drought zone 1 for the next 10 months. Under high rainfall scenarios (i.e. 120% of LTA), levels are expected to recover to average conditions.