I have a project that recieved LEED BD+C: New Construction v2 - LEED 2.2 in 2014. They recieved a credit for water reduction with low flow toilets. 

First of all, do they need to recertify to keep their certification? 

Second, if they install new low-flow toilets with less water reduction than they originally had, will that effect their certification after they have already been certified?