Well, for the most part, it may seem ridiculous, but you should understand that some aquifer systems are fed entirely off rainwater, and I've sat in a couple meetings in which water critical discussions brought just such a restriction/enforcement issue to consideration. The main impetus for the consideration focused on commericial rainwater harvesting processes, but the slant was that the conditions would be imposed unilaterally, meaning ye old humble homeowner with a 2,000 liter tank out back would be subject to the same burdens by rules of fair principle.

Believe me, it polarized the conversations pretty darned quick, but it alarmed me that it was even being brought up.