The number of coronavirus tests conducted in California more than doubled, to nearly 67,000, up from 27,000 on Monday, as dozens of new testing sites reported numbers to the state, Gov. Gavin Newsom announced Wednesday.

Until mid-March, just 22 public health labs in California and some private lab companies like Quest and LabCorp conducted tests. But last week, dozens of health care providers, universities, small labs and companies also began testing. Among them were Kaiser Permanente, Stanford and Verily, a division of Google’s parent company Alphabet.

Not all of the sites had submitted test data to the state in a way that allowed them to be counted.

For example, Kaiser Permanente in Northern and Southern California conducted 12,000 tests that were not included in previous public counts, Newsom said at a news conference.

Now, the governor said, “We’re making sure they’re in line with our collection data. Over the last week we’ve been scrubbing all those, getting down into the smallest collection labs to make sure everyone is on the same page.”

Because of the critical need for testing and accurate numbers, the state is trying to transform California’s decentralized testing system into a unified, single reporting system.

But California still isn’t testing enough people.

“It’s not good enough,” Newsom said. “We want to see more tests in the state of California, smarter and more targeted testing, and more community surveillance.”

California has done far fewer tests than New York, which had conducted nearly 104,000 tests as of Wednesday, according to the Covid Tracking Project, a database of state testing data compiled by journalists at the Atlantic.

One explanation is that New York state started testing more people sooner than California because the state requested and received emergency-use authorization from the FDA to start using its own lab-developed test on Feb. 29. At that time, California was using tests supplied by the Centers for Disease Control and Prevention.

“New York was able to start testing earlier than states that were waiting for the CDC test,” said Dr. Eric Blank, chief program officer of the Association of Public Health Laboratories.

The FDA database of approved emergency-use authorization shows the agency never authorized such a test for California. It is unclear if California developed a test for which the FDA denied authorization, or whether the state never developed a test. The California Department of Public Health did not immediately respond to the question Wednesday.

Long wait times to receive test results are also hampering public health officials’ ability to fully understand how quickly the virus is spreading.

Of the 66,929 tests conducted in California, results for nearly 73%, or 48,600, are pending.

Physicians and patients who have been tested have complained that it takes up to 10 days to get results back.

Many tests have to be sent from clinics and doctors’ offices to labs in another part of the state, and labs wait until they have enough tests to run a batch; this means many people are waiting at least four to seven days to get results back.

Only testing sites that use in-house labs, such as Stanford Health, or sites that immediately send samples to a nearby lab, like the Hayward fire station site that uses a lab in Menlo Park, are able to get results back within a day. But same-day and next-day results are the exception, not the rule.

Meanwhile, New York has reported nearly 31,000 cases and 285 deaths — by far the most out of any state — while California has reported nearly 2,600 cases and 59 deaths, even though the states were neck and neck in number of cases during the first week of March.

“Far and away, New York City and state have far more cases and are doing a higher level of testing, on the public health side and on commercial side,” Blank said. “There’s a lot more testing activity going on in New York, relative to California. Right now New York is the hot spot.”

Chronicle staff writer Erin Allday contributed to this report.

Catherine Ho is a San Francisco Chronicle staff writer. Email: cho@sfchronicle.com Twitter: @Cat_Ho