Tauranga's water supply has hit a record low with water usage rising 14.3 million litres above the daily average.

The repercussions could see a complete ban on hoses, on top of already tight restrictions forbidding residents to wash cars, houses or boats with a hose - using a bucket instead.

With long hot days over the holiday period and little rain in sight, Tauranga is facing a water shortage like never before.

Tauranga City Council water services manager Peter Bahrs says the city is rapidly reaching the 30 per cent spike in water use seen over summer, despite being one month into the season.

And, he says the three previous hot summers have already left the city's aquifers dribbling.

"The challenge that we've had is that in 2020, for the first time, we saw our source water stream flows dropping.

"As a result, we kept the water restrictions in for a longer period but unfortunately our streams haven't recovered over the winter and we started going into summer with our source water streams at a low ebb."

Tautau Stream pictured in March 2021.

In November last year, Tauranga City Council introduced a Water Watchers Plan replacing traditional outdoor watering restrictions with a year-round strategy to help maintain the city's water supply.

Bahrs says from December to March sprinklers were banned completely, but handheld hoses with a trigger nozzle were allowed for a one hour maximum between 7pm and 10pm.

"The reason we are embarking on this strategy is to avoid the Auckland situation. We believe it will reduce the demand sufficiently to allow normal usage within the constraints of the restrictions."

However, Bahrs says if people do not follow the plan and stream levels become critical, he will have to introduce tougher restrictions.

Recent rain prior to Christmas might make residents hopeful, however, Bahrs says it will not be helping the supply immediately.

"The streams are fed from groundwater and the aquifers need to recharge.

"Clearly the past three very dry, hot summers have created the issue for us. We have to wait for that rainfall to charge up the groundwater and get back into the stream."

Bay of Plenty Regional Council water shortage events manager Steve Pickles says across the region, stream flows are low.

He says it's not an issue ever seen before early 2020.

"The rain that falls today shows up as the spring flow in about a year or two.

"We are in the middle of a period of dry weather, the effects on those streams therefore, could last for another year or two even if we get good rainfall over the next 12 months or so."

Pickles says the water shortage could be a result of a normal cycle of weather, which lasts anywhere from seven to 10 years.

He says the region could be in a dry period of one of those cycles.

"It also could be an indication of what climate change may in fact bring us where we have long, dry and warmer periods interspersed with some sort of heavier rainfall.

"So although we may get a similar annual rainfall sort of volume, that may be coming in shorter, sharper bursts, which do have an impact on recharging our groundwater and keeping those streams flowing at a good rate."

Margaret of Tauranga South Garden Club says there are many ways to conserve water over the summer period that did not require a hose, or sprinkler.

"There are lots of diverters you can buy for your downpipes so you can collect it when it does rain.

"Do your dishes in a bowl and then throw that on your vegetable garden, brilliant."

She says it's not hard to be conscious of water once you got into practice.

"People do waste a lot of water, they don't think about it. They turn the tap on and run it while brushing their teeth or rinsing a cup that doesn't really need to be rinsed.

"There are a lot of things that people can do that they don't at the moment."

Tauranga City Council is building a new water intake and treatment plant alongside the Waiāri Stream, near Te Puke, which is expected to be ready by the end of 2022.

-RNZ/Leah Tebbutt.