During the long, warm,dry weekend residents were warned to be "extremely careful" with their water usage - a message they seemed to abide by.
Napier Mayor Bill Dalton said he had received good feedback that residents were restricting their water use.
Residents were "delighted" that the council had acted quickly to try to conserve water.
Council manager of communications and marketing Fiona Fraser said there had been a "really incredible response" on social media from residents.
"Napier has been wonderful - super understanding and largely happy to comply.
"Our reservoir levels have improved and that wouldn't have happened without help."
At the weekend council advised residents that although it might be tempting to get out the hoses and sprinklers and top up paddling and swimming pools, doing so could severely impact the city's ability to continue providing water consistently and without outages this week.
Level 2 water restrictions would remain in place for at least the next three days.
All council facilities and departments were also following strict water conservation recommendations.
Non-essential water use was halted, such as the National Aquarium of New Zealand recirculating water rather than drawing more - and alternative non-portable water supplies were being used for watering public land.
Water restrictions are already in place in Central Hawke's Bay, with Hastings District Council imposing similar restrictions for Hastings and Havelock North.
Addresses that are odd numbered should water on odd-numbered calendar dates only.
Addresses that are even numbered should water on even numbered calendar days.
"Shorter showers, only running full loads in the washing machine and refraining from washing cars and pets will also help," Mr Dolley said. "Conservation is key and every little bit counts."
National water standards dictate that chlorination should continue until three negative tests are returned.
Council staff worked throughout the weekend but it was expected the earliest tests would be returned would be sometime this week.
The Hawke's Bay District Health Board reported there were no increased levels of sickness in Napier.
At the weekend another E.coli scare in Wellington resulted in chlorine being added to a Lower Hutt water supply.
Water for about 76,000 residents is now being treated after a reservoir in Naenae tested positive for the bacteria.