Here's a draft notice you can send out:
Subject: Scheduled Water Shutoff — Tuesday 9:00 AM to 1:00 PM
Dear Residents,
Please be advised that the building's main water supply will be temporarily shut off on Tuesday from 9:00 AM to 1:00 PM to perform routine maintenance on the riser system.
What to expect
- No cold or hot water during the window
- Service restored progressively starting around 1:00 PM
- Brief discoloration is normal — run cold taps for 1–2 minutes
Thank you for your patience.
— Management