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 2017 and 2018. Rainfall in August was 63% of LTA and levels have continued to decline in line with the LTA trend over the summer months. Groundwater levels could reach drought trigger zone 2 under a continued 60% LTA rainfall scenario for the first time since 1997. Under wetter conditions, levels are forecast to remain in drought zone 1 for the next 10 months.