Yes. Don’t spill chemicals upstream. Prevention is always the best medicine.
Not trying to be sarcastic. When we take preventative measures, we’re able to provide effective protections for our systems. From identifying possible chemicals that could spill to understanding where gaps may be in the treatment system and resolving them, there are plenty of steps that we can all take right now in our communities.
We also have access to some pretty incredible imagery thanks to satellite data and other forms of image collection. These images can also be used to look at potential chemical spills, the location of a possible spill, and what steps can be taken now to contain a future spill to limit possible damage.
Without details; you would want to assess upstream activities, perform a risk evaluation, plan prevention and mitigation measures; which could include berms and barriers, including deployment redundant filtration systems
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That is why in Ontario we have invested a lot of money in protecting our raw water sources with formal Source Water Protection Plans, very crucial for highly urbanized industrial areas. this link will start you off: http://www.ctcswp.ca/protecting-our-water/what-is-a-source-protection-plan/
So in particular for chemical spills, eg diesel is stored in tanks that are on a bed of stones with an impermeable liner, so when the chemicals leak, they are stopped form the liner by entering ground water