In West Texas there are cities that use open man made marshes to black waters that are used for irrigation of field crops.
I found this information online from a California gray water article.
1. Greywater is about 1000 times less dangerous than combined wastewater.
So, greywater systems can be about 1000 times less effective at
sequestering pathogens from people and still be no more dangerous than
septic or sewer systems.
Greywater has three or so orders of magnitude (1000x) less pathogens than combined sewage. (All references follow below)
2. A billion system-years of experience with systems made poorly, under
prohibition, without professional or regulator guidance in the US, has
unintentionally proved that greywater systems are exceedingly safe in
practice.
There are 8,000,000 unpermitted greywater systems
in the US; nearly 1,700,000 of them are in California. Yet even in this
totally uncontrolled, health nightmare scenario (the status quo),
people are not getting sick because of point #1: there has not been a
single documented instance of greywater transmitted illness in the US.
The risk is surely non-zero, but it can't be very high at all or some
blip would have shown up on the radar of our world-class public health
system.
This is simply a colossal sample size. If greywater
opponents' calculations were anywhere near true, there would be so many
sick people that you'd notice them even if you weren't looking. If, for
example, one out of one thousand greywater users got sick from a year's
use of greywater and said so, we've have recorded a million cases since
1950.
In reality, in twenty years of wrangling over greywater rules,
no opponent has been able to produce a single documented case of
greywater-transmitted illness in the United States.
This supports
the simple, obvious logic of point #1. The risk is surely non-zero, but
it can't be as much as the risk of being hit by lightning, say (400
victims a year), or some blip would have shown up on the radar of our
world-class public health system by now.ere has never been a proven case of gray water illness in the U.S. in fact it is beneficial to micro organisms in the soils as long as it doesn't go into an waterway but into soil there is no problems with gray water.
I found this information online from a California gray water article.
Wes
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