Season 1 - 1 time

101: Nikita
Nikita: (aloud) Housekeeping! (to her comm set) Now what?

Season 2 - 2 times

205: New Regime
Petrosian: Yes, I just got a message from housekeeping. Operations is recovering, he will be transported to a hospital in Geneva. It won't be long before he returns. And it won't be long before I am gone.

213: Fuzzy Logic
Nikita dispatches the two thugs. She orders Barrie to pack his things and never come return. She then calls housekeeping, saying that she has been exposed.

Season 3 - 5 times

302: Someone Else's Shadow
Birkoff: Get his access card. Housekeeping's right behind you.

303: Opening Night Jitters
Michael: Hallway clear. Send in Housekeeping. (A team enters wearing night vision goggles. The Torture Twins are among them. They enter the sleeping man's room.)

308: Under the Influence
Madeline: Housekeeping.

316: Before I Sleep
Madeline: Housekeeping. The attrition has been high there.

317: Third Party Rip-Off
Davenport: No one but Velden and our people walk away. We'll have seven minutes max. Four for the primary teams, three for housekeeping. Questions? Right let's go.

Season 4 - 4 times

406: Love, Honor, and Cherish
Nikita: (Into comm set) This is Nikita. We'll need housekeeping.

407: Sympathy for the Devil
Michael: Housekeeping.

418: Toys in the Basement
Quinn: Housekeeping found this. It's a thermal block. We knew that Bright Star had the technology to block our RNR block scans but not this. This is why we couldn't see them until they left the room.

422: Four Light Years Farther
After Madeline swallows a pill that kills her.
Mr. Jones: I shall miss her fortitude. (He hits the intercom) Housekeeping.