I've got a ditch in my backyard that I believe was intended for stormwater drainage. It's about 2-3 feet deep so I imagine that there could be some percolation from the surrounding soil as well and not just run-off. As far as I can tell, the only run-off would be from my and my neighbor's yards, and none of us use any pesticides.
On the pros side, it seems like there must be decaying plant matter and other organic material, could my brownish ditch water be beneficial kind of like a compost tea, or is this more likely to be a disease vector?
On the cons side, I'm not sure how much things like airborne pollution into ditches are a factor. I've never heard of people avoiding using lake water for irrigation, etc and I'm not sure what about my ditch would make it any different.
Ultimately I'd like to avoid using city water to water my plants, but not at the expense of contaminating my soil.