Manx Utilities has reported a spike in demand.
The news comes after one of the hottest weekends of the year.
The company said overall stocks are still healthy and there are no immediate plans for a hosepipe ban.
The tweet from the water company came after an image was posted by Peter Killey from Manx Scenes Photography showing low water levels at Injebreck Reservoir in West Baldwin.
A Manx Utilities spokesman said Sulby reservoir is currently pumping stocks to the area.
Braddan footpath to close for sewer works
Gun club applies to expand facilities
New shop wants to know your preferred opening hours
Manxman's enormous shaft in good hands in Denmark
Tax return deadline looming - is yours done yet?
Landslip demolition work means Laxey road closure
Fancy doing a rubbish job for government?
Charity HQ vandalised for second time in two weeks