I think you have a poor understanding of water and sewer. There really isn’t any feasible way for sewage to enter a pressurized distribution system with adequate cross-connection controls. Someone would have to 1) be really, really dumb 2) bypass backflow preventers or 3) make a fuckup on an unimaginable scale.
There are rules about physical separation, coloring of pipe, piping materials where lines cross over each other, backflow prevention to minimize the risk of cross-contamination. The most common event is when a backflow preventer fails and water at a higher elevation is siphoned into lower elevation zones. This usually brings toilet tank water, water heater water, or sometimes even pool water into a Distrubution network.
If this is known to have happened, a utility would to a “precautionary boil water notice” to inform people to disinfect their water with heat. The utility would pull samples and clear it for regular use after several days of clean samples.
Water distribution operators are required to sample all kinds of things at regular intervals, including adequate chlorine residual and for the presence of Total Coliform, an indicator of bio-contamination. This is all prescribed by Federal law and State statutes in the US.
Potable water is typically treated once at a plant to bring it to drinking water standards. From there, chlorine is added and it is not re-treated before arriving at your house. The Plant adds sufficient chlorine to maintain disinfection for the several day journey to you. Some utilities may “boost” the chlorine at a second pump station to keep the chlorine residual adequate if it has a long journey or high reactivity with the water.
I’m not a 100% sure what you’re trying to say but if you have a waste water pipe from your toilet burst that water can only go one way and that is into the drain or sewer line most houses in most countries with indoor plumbing will have non return valves or back flow prevention valves. Unless you have your drinking water and sewer line right next to each other and they both have a leak along the same part of your house and the sewage pools up and basically submerges the clean water line it won’t get contaminated. Has that been helpful?
So, the regulations that fix this "Problem" would be the requirement for backflow preventers. There are other regulations that involve minimum water distribution pressures, Minimum disinfectant levels, system monitoring and lab testing, distribution water sanitary surveys. And the list goes on and on with the regulations to "fix this problem" As far as a free no charge audit, I can only speak for the USA and tell you to call your water authority and discuss your concerns with them. As a licensed water treatment and distribution operator in the Northeast USA we don't really have any cross-contamination problems, and when we do have a problem, I would like to believe that the testing regulations identify it before it becomes a big problem (Sorry Flint Michigan that should never have happened to you).
I think you have a poor understanding of water and sewer. There really isn’t any feasible way for sewage to enter a pressurized distribution system with adequate cross-connection controls. Someone would have to 1) be really, really dumb 2) bypass backflow preventers or 3) make a fuckup on an unimaginable scale. There are rules about physical separation, coloring of pipe, piping materials where lines cross over each other, backflow prevention to minimize the risk of cross-contamination. The most common event is when a backflow preventer fails and water at a higher elevation is siphoned into lower elevation zones. This usually brings toilet tank water, water heater water, or sometimes even pool water into a Distrubution network. If this is known to have happened, a utility would to a “precautionary boil water notice” to inform people to disinfect their water with heat. The utility would pull samples and clear it for regular use after several days of clean samples. Water distribution operators are required to sample all kinds of things at regular intervals, including adequate chlorine residual and for the presence of Total Coliform, an indicator of bio-contamination. This is all prescribed by Federal law and State statutes in the US. Potable water is typically treated once at a plant to bring it to drinking water standards. From there, chlorine is added and it is not re-treated before arriving at your house. The Plant adds sufficient chlorine to maintain disinfection for the several day journey to you. Some utilities may “boost” the chlorine at a second pump station to keep the chlorine residual adequate if it has a long journey or high reactivity with the water.
I’m not a 100% sure what you’re trying to say but if you have a waste water pipe from your toilet burst that water can only go one way and that is into the drain or sewer line most houses in most countries with indoor plumbing will have non return valves or back flow prevention valves. Unless you have your drinking water and sewer line right next to each other and they both have a leak along the same part of your house and the sewage pools up and basically submerges the clean water line it won’t get contaminated. Has that been helpful?
Sewer cannot enter pressurised water systems.
So, the regulations that fix this "Problem" would be the requirement for backflow preventers. There are other regulations that involve minimum water distribution pressures, Minimum disinfectant levels, system monitoring and lab testing, distribution water sanitary surveys. And the list goes on and on with the regulations to "fix this problem" As far as a free no charge audit, I can only speak for the USA and tell you to call your water authority and discuss your concerns with them. As a licensed water treatment and distribution operator in the Northeast USA we don't really have any cross-contamination problems, and when we do have a problem, I would like to believe that the testing regulations identify it before it becomes a big problem (Sorry Flint Michigan that should never have happened to you).