The City of Murrieta's permit center handles pool permits and patio permits, but its list names those and not concrete pool decks on their own, so the list doesn't settle whether your deck job needs one. When a job needs a permit, we handle the application with the city and meet the inspector on site. If we aren't sure, we check with the city before we start.
If the deck is part of a new pool, the city's pool inspection handout lists a pre-deck inspection ahead of the final building and safety inspection, so the pour waits for it. The handout also requires the pool's electrical bonding grid to run under the surfaces around the pool, which has to be settled before concrete goes down. And drainage to the front of the property has to stay open, so the new deck can't block that path.
Around Murrieta and in cities like Temecula and Menifee, a lot of the decks we're called to look at are older slabs with cracks running out from the pool edge or low spots where water sits. We do the same work across those cities, and it starts with the same look at the slab.