'flushing for 3-5 minutes ' solving the issue shows that it is likely in the pipes of the household that tests are being done in. Aka, someone still has lead p

'flushing for 3-5 minutes ' solving the issue shows that it is likely in the pipes of the household that tests are being done in. Aka, someone still has lead pipes in their house. Could maybe be lead pipes leading to the house from the street too. There are two fixes: * add phosphates to the water, which reduce the amount of lead that will dissolve. Done in old cities where a large proportion of people still have lead pipes. * go replace those pipes. Done where only a small chunk of people have lead pipes so it is feasible to replace them all.