fairly common around here. I haven't had a whole lot to do with it, but here's what I recall form the guys i've talked to. Two main types of application. Waste sludge is the solids collected and pulled out. the other type is spraying of partially refined waste water through an irrigator, typically from what is called a shafer(sp?) system; mostly water with a fair bit of N in it, and less other stuff.
first off, processed sewage has to have a certain level of testing and meet certain standards. they should be able to tell you nutrient content AND heavy metal content and the nutrient management plan has to be adjusted to compensate. usually, heavy metals are below the EPA threshold anyway.
second thing is the nutrient management plan thats required. its effectively the same thing as a livestock waste management plan that many livestock operators have. it will contain details regarding storage, handling, rate and method to apply. big thing is, it tells, when, where and how much they are putting down. before they do anything, they are supposed to have this written and ready to go. They aren't a huge deal.
long term, you probably are going to have a faster build up of heavy metals, and you'll want to be sure your keeping up with soil testing that shows this. in the short term, it shouldn't be a big deal though. like any nutrient source, you'll be concerned about what is going on, and it is pretty high in P if I recall correctly. Treat it like manure and chances are, they will want to apply it at the nitrogen rate, which means you could start building up your soils P level. if you aren't in the production of direct to market produce, you shouldn't have to worry much about pathogens,
My suggestion would be, go into your local USDA-NRCS office, and ask there. They might not know off hand, its not something we do a lot with, but they can certainly put you in contact with the folks that know the local rules and regs. Around here, aside from the management plan and certain EPA prohibitions near towns, theres not much governing it.
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