I too enjoyed the story, most of all because it assumed an adaptive "normality" using the resources unique to the location they settled on. My view from the book, not a film/TV adaptation.
They lived in a subdivision throughout the series.
Sure, why not if it offers relative advantages?
? They always seemed to have plenty of food available.
I'd suppose that in a pandemic (or any catastrophe) that plunges population fast enough, there would remain widespread stocks of "shelf-stable foods", not to mention gardening and hunting bonuses.
? They always had running water to the houses.
Yes, gravity fed from reservoir quite some distance away - but which, as systems are wont to do sans maintenance, developed a leak which ended that easy source.
? The sewer system always seemed to work.
Gravity assist once again - with minimal "input" considering the "adjusted" numbers using it.
? They always seemed to have gas to drive their vehicles.
Yup, stretched a bit. Again, things like "Stabil" would be available in quantity but for how long would _those_ chemicals be able to rejuvenate varnish?
? They always had electricity to pump water, run the refrigerator, make ice, etc.
Hydro-electric - also failing eventually due to lack of maintenance. I don't recall mention of wind or solar... was there any?
? Although they had a backyard garden, it did not appear to be large enough to feed the number of people present.
Size matters.
Given the unknown variable,
? I do know that that section of California is able to grow things pretty much year-round (depending on crop).
? They never showed regular scavenging expeditions, stockpiling of canned foods, home canning, or other food preservation.
Not so much.
But the other part I liked was the organic transition to "making do" with what was available as one-by-one the technical goodies failed. Even the youngsters transitioned to bow and arrow as ammunition ran out.
All in all, it seemed to account for life moving forward though at a much less "technical" pace. While hints of reconstruction were given. A feat which might not be possible if too much infrastrucute and knowledge are lost in something like a nuclear war.