The answer to 'when to replace sump pump' is that you should replace your sump pump every 5-7 years, or sooner if it is not functioning properly. Sump pumps are essential for preventing basement flooding, but they can wear out over time due to the constant use and exposure to water. Signs that your sump pump needs to be replaced include loud noises, failure to turn on, or inability to remove water effectively from your basement.
Replacing your sump pump is an important home maintenance task that can help protect your home from water damage. It's a good idea to have a professional plumber inspect and service your sump pump annually to ensure it is working properly.