Santa Rosa police arrested nine people during a DUI/Driver’s License checkpoint late Friday, and cited or arrested an additional 18 drivers for unlicensed vehicles and suspended or revoked licenses.

The checkpoint was from 8 p.m. to 2 a.m. on Farmers Lane, south of Sonoma Avenue.

Officers from CHP, Rohnert Park, Cotati and Sebastopol also participated.

Andres Arteaga-Ramos, 35, of Clearlake, was arrested for suspected DUI, and he and his passenger, Jeronimo Flores-Gonzalez, 38, also of Clearlake, were both arrested for illegal possession of a concealed firearm in a vehicle. Gonzalez was charged with felony possession because of a previous felony conviction. Ramos also was charged with suspicion of felony possession of narcotics when he was found with illegal drugs when being booked into the Sonoma County Jail.

Constance Brown, 54, of Petaluma, was arrested on suspicion of DUI and violation of her probation. She also was arrested on suspicion of felony child endangerment as a grandchild was in her car was she was arrested at the checkpoint.

Future checkpoints at unannounced locations are planned.

Groundwater: What you need to know

For information on the Sonoma County’s Sustainable Groundwater Management program, click here.

For a Department of Water Resources tool that will show if your property is in a groundwater basin, click here.

Groundwater basins are California’s largest reservoirs, more than 10 times the size of all surface reservoirs combined.

Groundwater provides about 38 percent of the state’s total annual water supply, and up to 60 percent in dry years.

Sonoma County draws more than 70 percent of its water from wells to meet demand for 260 million gallons a day.

More than 80 percent of Californians rely, in part, on groundwater for their drinking water.

Groundwater and surface water are interconnected, and groundwater pumping draws water from rivers and streams.