Yarra Valley Water has issued a water warning notice for more than 80 Melbourne suburbs.

Damage caused by storms overnight led to undisinfected water from Silvan Dam entering the water supply system.

Customers in 88 suburbs are being told not to drink their tap water or use it for food preparation unless it is boiled first.

Water which has not been boiled may be used for showering, bathing, flushing toilets, hand washing, washing dishes, clothes and garden watering.

The contaminated water may cause gastro-like symptoms if consumed.

If you experience any of these symptoms, please contact your doctor.

An estimated 250,000 households are affected by the issue, which is expected to be resolved later today.

Affected suburbs:

ATTWOOD
FAWKNER
OLINDA
BAYSWATER
FOREST HILL
PARK ORCHARDS
BAYSWATER NORTH
GLEN WAVERLEY
PLENTY
BLACKBURN
GREENSBOROUGH
RESEARCH
BLACKBURN NORTH
GREENSBOROUGH
RESERVOIR
BLACKBURN SOUTH
GREENVALE
RINGWOOD
BORONIA
HEATHMONT
RINGWOOD EAST
BOX HILL NORTH
KALORAMA
RINGWOOD NORTH
BROADMEADOWS
KANGAROO GROUND
ROXBURGH PARK
BULLEEN
KILSYTH
SILVAN
BUNDOORA
KILSYTH SOUTH
SOMERTON
BURWOOD
KINGSBURY
SOUTH MORANG
BURWOOD EAST
LALOR
TEMPLESTOWE
CAMPBELLFIELD
LILYDALE
TEMPLESTOWE LOWER
CHIRNSIDE PARK
LOWER PLENTY
THE BASIN
COBURG NORTH
MEADOW HEIGHTS
THOMASTOWN
COLDSTREAM
MELBOURNE AIRPORT
VERMONT
COOLAROO
MERNDA
VERMONT SOUTH
CRAIGIEBURN
MILL PARK
VIEWBANK
CROYDON
MITCHAM
WANTIRNA
CROYDON HILLS
MONBULK
WARRANDYTE
CROYDON NORTH
MONT ALBERT NORTH
WARRANDYTE SOUTH
CROYDON SOUTH
MONTMORENCY
WARRANWOOD
DALLAS
MONTROSE
WESTMEADOWS
DONCASTER
MOOROOLBARK
WOLLERT
DONCASTER EAST
MOUNT DANDENONG
WONGA PARK
DONVALE
MOUNT EVELYN
YALLAMBIE
DOREEN
MOUNT WAVERLEY
YARRAMBAT
ELTHAM
NORTH WARRANDYTE
EPPING
NUNAWADING