How Should Janitorial Staff Clean a BSL-2 Lab?

What the BMBL says about BSL-2 spaces

The BMBL, now in its sixth edition (2020), is guidance that institutions adopt through their biosafety officers and committees. BSL-2 applies to work with agents of moderate hazard. Its standard practices make the laboratory supervisor responsible for controlling access, call for a biohazard sign at the entrance when infectious materials are present (showing the biosafety level, a contact person and entry and exit requirements), and require lab personnel to decontaminate work surfaces after work and after any spill or splash.

The facility rules matter to custodians as well. BSL-2 labs should have self-closing, lockable doors and must be designed to be easily cleaned and decontaminated; carpets and rugs are not permitted. Everyone who enters, including support staff, is to be told of the potential hazards and must meet the posted entry and exit requirements.

BSL-2 lab cleaning: who does what

The cleanest way to avoid exposure is to keep custodial duties away from anything that may hold infectious material. A written split, agreed with the biosafety officer and posted for both teams, prevents the gray areas that cause incidents.

Entry rules for custodians

Most problems are avoided by timing and discipline. Cleaning is scheduled after the lab has finished for the day, or at times the lab has agreed, and the custodian reads the door sign every visit rather than assuming nothing has changed.

• Enter only when the lab has released the room or a contact has confirmed it is safe
• Wear the PPE posted at the door, typically a lab coat, gloves and eye protection
• Bring no food, drink or personal items into the lab
• Do not touch anything labeled with the biohazard symbol
• Use mops, buckets and cloths dedicated to lab areas
• Damp mop rather than dry sweep, to avoid raising dust and aerosols
• Wash hands before leaving, and never prop the lab door open

Training, exposure and California rules

Whether a custodian falls under Cal/OSHA's bloodborne pathogens standard, Title 8 section 5193, depends on whether contact with blood or other potentially infectious materials is reasonably anticipated in the job. Labs that work with human blood, tissues or cell lines often meet that test, and section 5193 then requires an exposure control plan, training and an offer of hepatitis B vaccination to exposed workers. Many institutions design custodial duties to avoid that exposure entirely, which is the safer route.

Labs also use hazardous chemicals, so the contractor's crew needs hazard communication training under Title 8 section 5194, and the lab should brief them on its own chemicals. Every incident, even a suspected splash, should be reported and evaluated the same day.

Where waste handling stops

In California, biohazardous waste is regulated under the Medical Waste Management Act in the Health and Safety Code, overseen by the California Department of Public Health. The lab that generates the waste packages, labels and treats it or hands it to a registered hauler. Custodians remove only waste the lab has designated as ordinary trash, and if the institution allows treated waste to go out with regular refuse, the lab marks it clearly before anyone else handles it.

How EBS approaches lab cleaning

EBS provides cleaning for labs and research facilities as part of its life sciences work, covering lab surfaces, support areas, restrooms and floors with documentation on every visit. Team members are trained and background-checked. At the walkthrough, a supervisor and your biosafety contact agree on the task split, entry times and restricted rooms, so the crew's checklist reflects your biosafety rules.