We unconsciously flush, pour, wash chemicals and toxins down the drain every day. This daily dose of pollutants in to our water supply builds up over time. I have taken an active step in ensuring that we drastically reduce (and hopefully eliminate) the chemical load that our house puts on the water supply. I also make sure to educate my friends and family about the impact of this as well, and help them to change their habits too!
For example, some of the easy things we do include not using fertilizers, insecticides or pesticides in our yard and garden. We've made the switch to certified organic, 100% beneficial ingredient soaps and personal care products that don't contain any synthetic chemicals. We don't use chemical cleaning products (we use a natural probiotic cleaner that leaves healthy bacteria on your surfaces).
It's a small step, but one that has a big impact if everyone takes it!