Then that pretty much answers your question, right?
There are, in some places, local agencies that will regulate certain matters in connection with apartments, but there is typically no oversight regarding rented single-family residences (which is what it sounds like you've got).
You didn't mention how long it's been since you notified the landlord. Therefore, for all we know, you it may be no more than a couple days, or maybe it's been months. It's up to you to assess the seriousness of the condition, and it's worth pointing out that your potential liability for injuries to others is not impacted by the fact that the lease puts the responsibility on the landlord to make the repair. Obviously, you should keep calling the landlord about this, but you may get to a point where you need to make a decision to pay for the repair yourself and try and get reimbursed by the landlord (or, if allowed by your state's landlord-tenant law, deduct the cost from your rent payment).

