Several houses on my street and in my neighborhood, built in '67-'68, near Lake Hefner, have recently had sewer backups, i.e., raw sewage coming up through the drains and toilets and such in seemingly isolated houses, but in recent weeks, 4 houses on my street and in the past year at least two other additional houses in the neighborhood and probably more.

1) What can be done to prevent this; and

2) Who should I call at the City so we can have them out here to ensure that their sewer lines are in order.

This is pretty scary stuff as even though I have homeowner's insurance and even additional flooding insurance, my policies all specifically exclude this kind of event. What can be done?