I assume you mean "security deposit." Ask your landlord to spray. The recent wet weather may cause ants to come into your unit. IMO, a single event of ants in your unit is not grounds to break your lease.
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No, not likely. While the landlord has a duty to provide a habitable premises, an ant infestation would probably not constitute sufficient grounds for you to terminate your lease and move out without financial consequences to you. The landlord would be entitled to deduct from your security deposit for any unpaid rent, per Civil Code section 1950.5. You should advise your landlord of the ant issue and allow a reasonable time for the landlord to take care of it.
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