The Florence County Sheriff's Office narcotics team found an active methamphetamine lab at a home on Cummings Road in Effingham just after 4 p.m. Thursday, according to Captain Michael Nunn.
Nunn says the discovery of the lab comes after an investigation that started from residents complaints.
The State Law Enforcement Division (SLED) is helping to dismantle and clean up the meth lab.
Four people have been taken into custody. Their names aren't being released at this time.
Nunn says more information will be released Friday morning.