The lease states the landlord is only responsbile for water only.

On the water why did it come in? 

In the 1930s lead pipes were supplanted by copper as people realized lead was unsafe.The use of lead wasn't officially stopped until 1986 by the Safe Drinking Water Act Amendments.Also, up until 1986, many homes were still using lead-based solder on copper pipes. 

Long-time paramedic, getting my size 16 feet into the water providing safe and affordable rentals to those that need it. 

If they are on a third party payment plan for water they are probably going under economically. 

I paid him via Zelle.The next guests said there was standing water in dishwasher on checkout day.

Provide snacks, bottled water, premium coffee, s'more kits, maybe even a small gift. 

I’d recommend mid grade dimensional shingles, and high quality ice and water in valleys and around all penetrations.

The home has minor water damage in a bathroom.

@Miguel GonzalezEvidence of foundation issues or water intrusion would be a concern.