Hitting close to home...
Entire housing estate to have mandatory covid tests after the virus is detected in their sewage.
This housing estate is the closest "city" to me (I live in a rural area so if I want to go somewhere close for dim sum or McD's or to the post office, pharmacy, or wet market, this is where I normally go).
Fourth wave, and the fourth outbreak at this estate. I haven't really been there in a long time because of this, but it's definitely a no-go from now on until I get vaccinated
I had no idea they were testing sewage, but it seems like a good way to cover millions of people all at once, and narrow down from there who has the virus.