The owner of Too Good Auto Body on Pine Street in San Francisco says winter is his busiest season with cars slipping and sliding on wet roads.
"We see a lot of rear end collisions. People aren't stopping in time and not giving themselves enough distance. They tend to smash into the car in front of them," said Steven Chin, owner of Too Good Auto Body.
The average repair cost upwards of $3,000.
VIDEO: 1998 Rio Nido mudslide victims recall El Nino experience
In the Oakland Hills there's a different kind of trouble on the roads. A massive tree came crashing down at Skyline Boulevard and Elverton Drive. Crews worked in the rain to chop it up and get it out of the way.
Homeowners on and around Cayuga Avenue in San Francisco are preparing for the worst. They haven't even recovered from last year's flooding. They blame the city's outdated sewer system.
PHOTOS: El Nino storms pound the Bay Area
"We're asking them to stop flooding our homes with raw sewage and when there is rainy weather that's what happens with us," said Blane Bachelor, a San Francisco resident. "So, we're terrified what's going to happen this winter."
Sandbags are stacked almost knee-high throughout the neighborhood. San Francisco's Public Utilities Commission says crews check hot spots like Cayuga before and during storms.
"It allows us to make sure things is flowing free and clear during those storms and nothing's clogging that might exacerbate the problem," said Tyrone Jue of the SFPUC.
Residents have filed a class-action lawsuit against the city, recently adding an amendment that would stop all development in San Francisco until the problem is fixed, permanently.
VIDEO: Watch Accuweather Forecast
ABC7's Live Doppler 7 HD is the most powerful radar in the Bay Area. CLICK HERE to watch this 24-hour live stream from your desktop/mobile and track the weather as it moves through the region. WATCH LIVE DOPPLER 7 HD RADAR
What's the weather like #whereyoulive? Share your photos and videos on Twitter, Instagram, or Facebook by tagging them #abc7now.
Tough traveling to the mountains tomorrow! Winter Storm Warning just issued for WED. Carry chains, expect delays. pic.twitter.com/0bI2T5UCr2— Sandhya Patel (@SandhyaABC7) January 6, 2016
Moisture plume stretches over 700 miles & that means Bay Area gets drenched in AM! Strong winds will make it worse. pic.twitter.com/AxVnGVkUZE— Sandhya Patel (@SandhyaABC7) January 6, 2016
Here's how much rain our storm brought today. Not enough for you? There's more coming tomorrow! pic.twitter.com/oG6a0aYgNz— Sandhya Patel (@SandhyaABC7) January 6, 2016
Ground's wet so next storm may cause possible flooding, mudslides, debris flows. Here are watches & warnings. pic.twitter.com/eUnTP0F6Ne— Sandhya Patel (@SandhyaABC7) January 5, 2016
Let it snow! Live look from Lake Tahoe right now looks beautiful! pic.twitter.com/rmsNg2uCyg— Sandhya Patel (@SandhyaABC7) January 6, 2016
We have only scattered showers in the Bay Area now, but another strong storm will arrive overnight. Be prepared. pic.twitter.com/motbVPJXn6— Spencer Christian (@SpencerABC7) January 5, 2016
Moderate rainfall in San Jose. pic.twitter.com/MpsPKxkOiZ— Matt Keller (@MattKellerABC7) January 5, 2016