A 12-inch, cast-iron water main burst Thursday night on Browns Valley Road in west Napa, triggering an all-night repair effort.
For a time, nearby residences experienced reduced water pressure, Joy Eldredge, manager of the city's Water Division, said Friday. Six customers were completely without water for several hours, she said.
The break, located just south of Redwood Road, occurred on a line installed in 1967 that was billed to last 100 years, Eldredge said. The city is experiencing increasing failures of pipes from that era, she said.
Eldredge said the incident illustrates the importance of continued maintenance on the city's water system, which was stressed last week when the Atlas Fire destroyed some pump facilities serving Milliken Reservoir.
The city is preparing to impose a new pricing model for its water customers to boost revenues to maintain an aging system. The City Council will hold a hearing on the pricing changes on Nov. 7.
Customers can comment on the rate increases by mail or in person at the hearing. Customers received a mailer that allows them to protest the increase.