Contained in your lease, whether expressly stated or not, is the Implied Covenant of Quiet Enjoyment. A breach of this covenant, by the landlord, could be considered a constructive eviction. In order to be considered a breach, there must be a substantial interference with your right to the use and enjoyment of your property. You should consult with an attorney who can go over your options.
It seems to me your option is to move, perhaps even to another unit in the same building.
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As a practical matter, you might ask your landlord if you can relocate you to another unit in the complex or ask the water use be restricted to a later time such as 8:00 a.m. Monday through Friday and 9:00 a.m. on the weekends. In addition, you can request additional sound proofing. You might also consider moving your bed, if another bedroom is available in your apartment.
You should also ask the landlord to come listen to the noise.
Alternatively, the noise may be sufficient interference with your quiet enjoyment that you can be released from the lease. You should ask the landlord politely before threatening to ask for court intervention.