Water bosses say they hope to have supplies back to normal by 10am today (March 18).
Residents across Braintree and in surrounding villages are reporting a loss of pressure while others say they have no water at all.
It is believed a broken pump is causing the problems but Anglian Water says it hopes to have the repairs done by 10am.
Meanwhile, residents in Wethersfield are reporting similar issues.
Anglian Water is carrying out maintenance in the area which is expected to cause disruption until midday.
Updated 11.50am: The broken pump has been restarted and the maintenance has been completed.
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