This story was written by someone who doesn't understand the issue.
Somewhere around 25% of the billions of bacteria in our intestines are E. coli. Most strains are harmless and indeed essential. The varieties we hear of as killing people are not from human fecal contamination but rather from the gut of herbivores such as cattle or deer that has contaminated food. Human strains will mostly just have no effect.
However, because it is so common in the human intestines and can be easily tested for it is widely used as a tracer organism. IOW, if E. coli is present one can assume others of the many potential pathogens found in fecal material are also present. But the E. coli itself is not the problem.
Sorry bout the double post. Don’t know how that happened.