Raw water sources for Kaikohe had proved particularly vulnerable, and, after such a dry winter, both river and groundwater levels were worryingly low.
"For the Wairoro Stream and the Monument Hill bore to meet community needs over the coming summer, restrictions on water use must be put in place now," Mr Finch said, adding that the council was asking bulk water carriers and major water users in the Kaikohe area to find ways that they could help reduce consumption.
He also urged residents to conserve water to help prevent the need for even tighter water restrictions later.
Go to the Be Waterwise (Whakanuia to whakaaro ki te wai) website (bewaterwise.org.nz/) for information about Northland's water restrictions and tips on how to save water, and phone 0800 920-029 to report water leaks or breaches of restrictions.
Mr Finch said the council could grant exemptions to water restrictions in exceptional circumstances, but applicants would have to demonstrate significant hardship and have no practical alternative water source. Go to www.fndc.govt.nz/savewater for details and to apply for an exemption.