No Mattamy homes do not come with sewer back up prevention. Virtually no builders put them in but its not a bad idea. Milton does not have much of an infrastructure problem when we have a lot of rain fall as does Toronto. Unless you back it up yourself by putting baby wipes, feminine napkins, dental floss (yes floss) you shouldn't have such a problem from the cities side. If you do choose to put one in, its a back flow preventer similar to the one on your sump pump that prevents the cities sewer system to pressure up back into your home. As said earlier, we are not Toronto and Milton wants all rainwater reverted to ponds and tributaries under ground rather than our sewer system unlike Toronto! Hope this helps!
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