The Nelson City Council will review water restrictions on Monday.
It imposed bans on Thursday for those who taking water directly from streams and wells.
Water restrictions for those on the council reticulated supply have not yet been introduced. However, the council said the trigger point for urban restrictions was being closely monitored as water levels in the Maitai Dam, Maitai and Roding Rivers were low.
All residents are being encouraged to conserve water as much as possible.
The ban on using water from rivers and streams applies to those in Whangamoa River and tributaries, Wakapuaka River, Teal River, Oldham Creek, Todd Valley Stream, Hillwood Creek, Poorman Valley Stream and Lud River catchments.
Residents are required to stop using water from these rivers and streams for non-essential purposes. This includes water for crop irrigation, garden watering, washing cars, houses, or driveways.
Water may only be used for fire fighting, drinking, watering stock and domestic washing.
The council recommends that those households drawing domestic water from those catchments arrange an alternative source of domestic water such as from storage tanks in case further restrictions on domestic supply become necessary.
– The Nelson Mail