Andrea,

I'm sorry it has taken this long for anyone to answer your question.

In my experience typically a "swale" runs throughout a coummunity of homes and if the township did it's job, it should not affect any individual home.

In the communities within which I serve, swales are commonplace and I must admit that the homes surrounded by such swales are not affected by water seepage into the homes provided they were structured property. Therefore, I must say, that you are justified in being concerned, but this should not dissuate you from buying the home of your dreams . . . however, it will require additional due diligence.

Should you desire to speak in depth about this matter, please feel free to contact me direct.

Love and Peace,
Francesca, ePro, SRES
Francesca@PatrizioRE.com