- NEW: State faces worst drought since records began 100 years ago, Gov. Jerry Brown says
- NEW: Governor asks residents and businesses for voluntary 20% conservation
- NEW: "This is an effort to call for arms," Brown says
- About 1,600 of 3,600 evacuated people return home in a Los Angeles-area wildfire
Los Angeles (CNN) -- California Gov. Jerry Brown on Friday declared a drought emergency for the state, saying it is facing perhaps "the worst drought that California has ever seen since records (began) about 100 years ago."
The governor's announcement, made in San Francisco, came as a wildfire burned Friday with only 30% containment in 1,700 acres of foothills of Los Angeles County near Glendora. An illegal campfire apparently ignited the wildfire, and fire officials also cited drought conditions for contributing to the blaze.
In his declaration, the governor called for voluntary "20% conservation of our water use" statewide.
"It's important to wake all Californians to the serious matter of the drought and lack of rain," Brown told reporters. "We are in a unprecedented, serious situation that people should pause and reflect on how we're dependent on rain, Mother Nature and each other.
"This is an effort to call for arms," he continued. "That's the point of the declaration."
Brown said he would set into motion an initiative that would make water transfers easier between regions in the state.
Meanwhile, the Los Angeles-area wildfire was brought under some control Friday, with 30% containment -- an improvement over 0% a day earlier.
About 800 firefighting personnel have been battling a blaze that began before dawn Thursday. It was allegedly started by three men camping in the foothills near Glendora, authorities said.
About 3,600 people were evacuated, and as of late Thursday night, about 1,600 of them were allowed to return home, according to the Angeles National Forest's update on the Incident Information System's website.
Meanwhile, a red flag warning was extended to Friday because of anticipated warm, dry breezes called Santa Ana winds, InciWeb said.
The wildfire allegedly began when three campers were tossing paper into a campfire, and a gust of wind spread embers, authorities said.
The three men, all in their early 20s, were arrested on suspicion of recklessly starting a fire, said Police Chief Tim Staab of Glendora. One man is from Glendora and another is from Irwindale, he said. Bail was set Thursday at $20,000 for each.
"The way it's told to us is that all three of them were together at the time, sitting around this campfire," he said. "Breeze kicked up, and that's what caused this fire.
"It's not a camping area, but people do camp up in the hills above Glendora," Staab said.
The arrests were made after authorities received a call that at least two people were suspiciously walking away from the fire, the chief said.
The three men arrested were identified as Jonathan Carl Jerrell, 23; Clifford Eugene Henry Jr., 22; and Steven Robert Aguirre, 21, police said. They and their attorneys couldn't be reached for comment.
The wildfire, named the Colby Fire, destroyed two homes and injured one person Thursday morning, Los Angeles County Fire Chief Daryl Osby said.
The injured civilian suffered minor burns, Osby told reporters.
"We predicted that this is going to be an intense fire season because this is the third year of an ongoing drought," he said.
There hasn't been a fire in Glendora's foothills since 1968, so the area has lots of brush and other fuel for a wildfire, authorities said.
CNN's Jason Hanna contributed to this report. Michael Martinez reported and wrote from Los Angeles.
