Comcast’s rollout of DOCSIS 3.0-enabled wideband data services continued with today’s announcement that the service is now available in San Francisco.

The San Francisco rollout adds another piece to Comcast’s DOCSIS 3.0 puzzle; in March, the wideband service was deployed in the San Jose/Silicon Valley area, parts of East Bay and the Monterey/Salinas area, all in California (story here).

Starting today, Comcast's faster tiers will be available to residential homes (and beginning April 28, to all businesses) in the following Bay Area cities: Atherton, Belmont, Brisbane, Broadmoor, Burlingame, Colma, Daly City, East Palo Alto, Foster City, Hillsborough, Los Altos, Los Altos Hills, Menlo Park, Millbrae, Pacifica, Palo Alto, Portola Valley, Redwood City, San Carlos, San Mateo, South San Francisco, Stanford and Woodside . Comcast said the new speeds will be available in other portions of the Bay Area later this year.

Comcast’s DOCSIS 3.0 tiers are Extreme 50 and Ultra. Extreme 50 features download speeds of up to 50 Mbps and upstream speeds of 10 Mbps for $139.95 per month. Ultra clocks in with 22 Mbps down and 5 Mbps up at a cost of $62.95 per month. Prices for Comcast’s residential wideband tiers require a subscription to Comcast’s cable service.

Business customers will also have access to the new wideband services. Customers can sign up for the Deluxe 50 Mbps/10 Mbps tier for $189.95 per month.

In addition to the new wideband tiers, Comcast said it will also increase speeds for its existing Performance tier customers, who will now benefit from doubled downstream and upstream speeds offering up to 12 Mbps and 2 Mbps, respectively.

Comcast, the nation’s largest cable operator, has previously said it plans on having its DOCSIS 3.0-enabled data service in 30 million homes and businesses by the end of the year. The number of homes represents 65 percent of Comcast’s footprint.

Comcast’s DOCSIS 3.0 speeds have already begun launching in 11 major markets, including the Twin Cities, the Boston metropolitan region and parts of southern New Hampshire, the Philadelphia metropolitan area, parts of New Jersey, Atlanta, Baltimore, Chicago, Ft. Wayne, Ind., Portland, Ore., and Seattle. Comcast said it will launch in additional markets in the weeks and months ahead.