It depends on the circumstances. In most cases, landlords are responsible for maintaining the property and making repairs, including plumbing repairs. If a tenant reports a plumbing issue, the landlord is typically responsible for arranging and paying for the repairs.

However, in some cases, a tenant may be responsible for the cost of repairs if the issue is caused by their own negligence or misuse. For example, if a tenant clogs a drain with grease or foreign objects, the landlord may charge the tenant for the cost of repairs.

It’s important to note that the laws and regulations regarding landlord-tenant relationships vary from state to state and country to country, so it’s important to check the specific laws and regulations in your area.

Also, it’s recommended to have a clear understanding of the responsibilities of the landlord and tenant in the lease agreement, it should state the expectations and responsibilities of each party regarding repairs and maintenance of the property.

In any case, it’s always a good idea for the landlord to keep detailed records of repairs, including the cost and the reason for the repairs, in case there are any disputes.