...I said that post-treatment sludge is not suitable for use as fertilizer on crops intended for human consumption, with few exceptions. Its use for such is rare and highly-regulated.
About half of WWTP sludge in the U.S. ends up being applied to land. It's called recycling. Remember, this is after treatment, which because of the Clean Water Act of 1972 (amended 1977, 1985) is pretty stringent in the U.S. The sludge looks like peat moss, and must pass a series of tests for toxin content and bioactivity.
The spinach contamination did not come from WWTP sludge. It almost certainly came from contaminated irrigation water. There have been 19 incidents of E. coli contamination of produce in regional or national distribution since 1995. None of them were due to use of WWTP sludge or fecal contamination of crops in situ.
Your link is to a political site, which naturally will take a political view. I prefer, when deciding science issues, to avoid political sources, because by definition they downplay science that does not fit their political beliefs. We've gotten in a lot of trouble in this country by mixing politics and science, and neither the left nor the right have an admirable record about scientific objectivity. Just sayin'.
I did read the whole article, and noticed they described the Green Acres fields as "agricultural" in a way that made it sound like the sludge was being used on tomatoes or lettuce or something else destined for the produce section at Von's. Then they threw in the descriptor "cess pool," beat the "toxic" drum a few times, and generally did plenty to maximize the emotional impact of the anti-sludge viewpoint. A responsible editor would have inserted a line clarifying that the sludge is used as fertilizer for crops that are fed to cows, not people, and would have separated the editorializing from the, umm, reporting. That editor might also have given some information about the safety testing that is carried out on the soil and on the cows.
Here's an AP report that summarizes other considerations besides the single political viewpoint of the article you cited. I'm not saying I agree or disagree with any particular view here, but it is worth noting that the sludge that's being recycled at Green Acres used to be dumped into the ocean, with bad environmental results. Google for more stories; there are plenty.
http://www.twincities.com/mld/twincities/news/breaking_news/15352626.htmWhat do you think we should do with post-processed sludge, fed-up?
Peace.