I can see from the responses ...

I can see from the responses a big NO is the answer to your most basic question. Many have advise of which regulation or organization to rely on.  At the current level of social evolution these mechanical and man made systems are the best one could hope for.   But now thanks to many visionaries the best answers to all of our environmental concerns is NATURE. A few billion years of systematic trials and errors has resulted in pure and healthy water, air, and fertile soil.  We have shifted away from natural forces allowing financial gain to be primary solution to life sustaining functions in nature.  We are all here because of these natural processes.  So for an exact answer to your overall question Watch and copy nature! Specifically catch, clean, use, reuse, bioremediate and reuse again RAINWATER. Just build a storage tank/cistern that will last more than 2 years. Everyone can use nature. No exceptions.