Auckland's water crisis is over and the city's water company says it's doing what it can to prevent it happening again.

Watercare says it can now produce enough water to meet the city's normal demands.

Watercare spokesman Mark Bourne said they have been gradually increasing capacity at its Ardmore treatment plant, which became clogged up with silt during last month's heavy rain.

"Since 15 March we've been slowly increasing the capacity of our Ardmore plant to 230 million litres of water per day. At the same time we've been adjusting production at our other plants to sustainable levels."

Bourne said they plan to spend $1.9 billion dollars over the next ten years to upgrade water infrastructure, and make the system more resilient.

He explained the changes include "securing new water sources, building new water treatment plants, water storage reservoirs and pipelines."