Officials from the government agency have admitted that the dry weather could lead to "drought management measures", especially in the Garden of England.
Last week South East Water dismissed the prospect of a hosepipe ban despite the continued dry spell but now people enjoying the 23 degrees Celsius heat on Sunday have been warned that restrictions could be on the way unless levels are replenished.
Agency spokesman George Leigh said this week that some rivers, groundwaters and reservoirs are lower than normal for the time of year but he said bringing in public water restrictions in Canterbury, Kent, is a decision for South East Water.
Below average levels of rain could force a hosepipe ban in the UK
He said: "Below average rainfall could increase the likelihood of drought management measures in some areas."
Work has started with farmers and businesses to reduce the impact, but one in the Canterbury area says those in his industry are unconcerned.
Trevor Bradley, who runs Boundary Farm with his brother Stephen, says the dry weather is not causing problems for the farm yet.
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Children drink water from a public water pump on the outskirts of Kabul, Afghanistan
Rivers and groundwaters are lower than average for the time of year
He said: "It's not a problem at the moment, we're getting crops in the ground which we can't do when it rains.
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I've never planted so many potatoes so early
Trevor Bradley, Farmer
"In a few weeks, probably a month, it could be a bit of a problem though. We'll need some rain by then.
"It has been dry but it's also been the easiest spring for a long time. I've never planted so many potatoes so early.
"If you get rain every other day it's difficult."
Trevor Bradley said he has never been able to plant his potatoes so early
South East Water's head of water resources Lee Dance says although it has been a drier than normal winter, the company does not envisage water shortages this summer.
He said: "Our aquifers are in a good position and our reservoir at Ardingly, West Sussex, is full, but whatever the weather, we do ask our customers to use water wisely.
"Water is a precious resource and cutting down on daily water use doesn't mean you have to make big changes.
"Just simple things like taking a shower rather than a bath, turning off the tap while brushing teeth and fixing leaking taps can have a huge impact on the amount of water households use."
National reports suggest a three-month heatwave but the Met Office says while there is an increased chance it will be hotter than normal over April, May and June, and drier than average, there could still be some colder spells.
The weather is having a devastating effect on butterflies.
The heath fritillary, restricted to just a handful of sites in southern England, saw numbers slump by 27 per cent compared to 2015 increasing fears for the future of the butterfly whose numbers have fallen by 82 per cent in the last decade.