The town on Friday urged water and sewer customers to stop all unnecessary water use, including irrigation, because two of the city's three Lake Norman intake pumps are broken.
The pumps stopped functioning because of mechanical failures, said Maia Setzer, director of administration and finance, but she didn't know how long it would take to fix them.
The one working pump can draw 3.6 million gallons of raw water into the town's water treatment plant.
The town has 13 million gallons of treated water in storage and 4 million gallons of stored raw water that can be treated and pushed into the system at any time, Setzer said. Customers use an average 4.5 million gallons a day.
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Workers began drawing down the treated water on Friday to limit the need to overwork the existing pump, Setzer said.
“If our customers will stop all unnecessary water uses, the water supply should be sufficient until the pumps are repaired,” she said.
One malfunctioning pump has been under repair since last week. The second quit earlier this week. Crews were working Friday to repair both pumps.
Mooresville is under mandatory water conservation restrictions because of the region's drought.
But it is following the suggestions of the Catawba-Wateree Drought Management Council by allowing people to water lawns, wash cars, top off swimming pools and run outdoor fountains on a schedule: Odd-numbered addresses on Saturdays and even-numbered addresses on Sundays.