You have to make your own decision.
What comes out is 100% dependent on what went in. If "many" people use chemicals, then some of that chemical residue will still be there in the compost. Not all of it--some high temps will deactivate/decompose certain chemicals--but the resulting compost will
not repeat
not be organic, if you're looking to start out 100% purely organic.
Howsome-ever, if you plan to mix this city compost with organic potting soil/mix in the raised beds, the % chemical residue of course will drop as a % of the total growing medium. If there's a soil company (around here I use
American Soil & Stone aka American Soil & Rock) nearby, they may make home deliveries of __ cubic yards of organic potting soil, organic compost, or what-have-you.
Tip: You want **container** potting soil or mixes for those raised beds, not regular soil consistencies. Raised beds, if bounded by walls/sides, act like large containers. They need larger pore spaces, on average, for drainage; otherwise, they can act like wonderful mud-filled bathtubs and simply drown your seedlings, young plants, or even mature veggie plants (via root rot). I solved the quandary of a fellow El Cerrito raised-bed gardener who kept adding compost,
compost, and more compost to her 20- or 24-inch wheelchair-accessible raised beds when they became--and stayed--waterlogged in the extremely wet winter of 2010/11. (She asked me these questions summer 2011.)
She was working literally upstream against two problems:
1) The designer of her beds wasn't aware of the needs of container soils for those larger pore spaces. He filled the beds with regular pore-space potting soil, designed for in-ground use.
2) The only advice she had previously received was to "add compost for better drainage."
I suggested that she add sand, although I
almost never suggest it, because I *knew* she wasn't dealing with native California adobe clay (hint: clay + sand = what well-known, hard-surfaced mortar?). Feedback from the 2011/12 winter was good, although last winter was much drier than 2010/11 was. This year will probably give us the best test.
Good luck finding organic compost! If you purchase in cubic-yard amounts, the price drops amazingly.
Cynthia H.
Sunset Zone 17, USDA Zone 9