The National Organic Program defines organic as follows: "Organic food is produced without using most conventional pesticides; fertilizers made with synthetic ingredients or sewage sludge; bioengineering; or ionizing radiation.
If you feel like you're drinking mud sludge, however, check the grind setting on your coffee bean grinder.
The piles of sludge are usually a good indication as to where they'll be!
Processing operations can't use ingredients that are genetically engineered or grown with the use of sewer sludge.
The clear effluent flows into the Thames, and the sludge is taken 50 m.