Warnings the South East could face a drought have come from a supplier as a second dry winter looms.
Figures from the company showed Bewl Water reservoir in Kent was at 34% and Darwell reservoir in Sussex is at 43%.
Two other Sussex reservoirs are better stocked – Powdermill is at 79% and Weir Wood is at 78%.
Fisherman Andrew Lush said: "These water levels are very rare.
And Rob Barden, another fisherman, said: "I’ve been here 21 years and it’s the third time I’ve seen it like this."
Mr McAulay said: "We have had one dry winter.
We’re currently in a second dry winter, so we are looking at how do we replenish our stocks."
We take less water out of the environment now than we did in 1976 despite the fact that we have far more people living in the region."
More than 75% of the South East’s water came from underground sources and the company was looking at how to recharge supplies, he added.
Average consumption in the UK is 150 litres a day per person, and in the South East 130 litres a day.