For Sale: 3-bedroom, 2-bathroom, 13.4-water credits.
It gets complicated fast, so why is it important to know when buying a home? Because when you buy the home, you are buying a fixed number of water credits and that will dictate what remodeling you can do. Issues like adding a sun room,
the setbacks from neighboring lots, and whether you can build a "granny unit" are all dictated by zoning and local building regulations. However, even if the local building regulations would allow you to add a half bath to your home if you don't have sufficient water credits you will not be able to do so.
And, this is really important - when you apply for the building permit you will need a stamp from the water management district as well.
Know all of your options.
A few years ago, the MPWMD realized that today it is a reasonable request to add a second bath to a one bath home, even if there aren’t enough fixture units assigned to the property. So, under the Second Bathroom Protocol (sometimes referred to as Ordinance 98) a property owner can apply for a water permit for a second bath for an existing one bath home. Keep in mind; you cannot then add a third bath by downsizing water fixtures without coming up with the credits for the “free” second bath.

If you are considering a one-bathroom home it is likely you can secure a water permit for a second bath. You should confirm that the home is eligible under Ordinance 98 before releasing contingencies under your purchase contract.
If you are selling a one bathroom home, I recommend that you confirm that a second bath can be added before putting the home on the market and make sure that potential buyers understand that possibility.
It is also possible to liberate fixture units by utilizing low flow appliances. For example, you could replace your current dishwasher (2 units including the sink) with a low flow dishwasher (1.5 units including sink) and have .5 credits to apply towards another fixture. You could also replace your washing machine (2 units) with an ultra low flow model (1 unit) and have another unit to use elsewhere. Any use of low flow appliances requires approval and a deed restriction from the MPWMD.
Whether buying or selling it is important to understand what water credits exist on the property.
As you can imagine, there are many other aspects of the water regulations that can impact property value. Even if you don't plan on remodeling a home in the immediate future, it is important to understand the water credits associated with any property you are thinking of buying.