A couple points I think are in order although you already have a lot of good information here. From someone living in Northern California - the crazy state has some rules - here is what I would suggest even when other states:
1. Check the location you want to pull from and local laws. I sent a few emails to the state water resource control board and also fish and game during our drought since I was going to collect water. That caught them a bit back but after a few more emails the general consensus was to collect outside marine and/or state parks. As long as I'm outside of those they didn't care and it was for home use. Meaning something I'm going to collect and take home via a suv or pick up. 50 - 200 gallons give or take.
2. Check the water conditions. I do this, or used to anyway (in upgrade mode and take maturing so waiting another 6 months), when I go scuba diving. I'll collect in Monterey. Anyway I always check the area I'm diving for sea life (mostly large mammals like sea lions) and bacteria blooms. If they are reporting bad water or bacteria I won't collect let alone dive.
3. No need, at least for me, to run UV. You bring it home, store it, let it sit, and use. Coral polyps will pop upon introduction even if I'm diving on a day with as little as 10 feet visibility or 70.
For us the main thing is just collection location and if it is allowed. If so then usually it is pretty good to go once you get home and let it settle. No power head, no heater, nothing. I'll be doing this again later in the year and can't wait. One or two dives off the beach, collect some water, grab a nice dinner, drive home and I'm good
