LIVERMORE -- Mandatory water conservation measures imposed on municipal water users will also now apply to the remaining two-thirds of residents served by the California Water Service Company, the Livermore City Council decided Monday.

"The entire city of Livermore, along with the rest of the Tri-Valley, is affected by the drought," said Public Works Director Dan McIntyre. "If conservation targets are not achieved by all of us before early summer, it will severely reduce the water supplies remaining to provide for any outdoor irrigation later in the summer."

Originally enacted April 15, the mandatory measures include restricting outdoor irrigation to no more than twice a week, prohibiting washing of driveways or sidewalks and limiting vehicle washing to once a month unless a commercial car wash is used.

The council also amended a water conservation ordinance intended to make it easier for residents with automatic sprinkler systems to comply with the restrictions. Now, homeowners with odd street address numbers will be allowed to water up to twice per week, on Monday, Wednesday or Friday, instead of on odd-numbered dates. Residents with even-numbered street addresses can water up to twice a week on Tuesday, Thursdays or Saturdays instead of on even-numbered dates. Watering will not be allowed on Sundays.

For more information, or a complete list of the measures, visit www.cityoflivermore.net/citygov/drought.asp.

Contact Jeremy Thomas at 925-847-2184. Follow him at Twitter.com/jet_bang.