A few weeks ago, I moved into a single-person house across from a larger four-person house on the same property. We are all college students in a college town, in the US. If it matters, I'm two grades above them. We share a backyard.
About a week in, they decided to set up one of those cheap $50 inflatable pools in the backyard, fairly close to one of my windows. (There'd be no other place to put it.) At the time, I'd mentioned that standing water isn't healthy to keep around for an extended period of time, especially untreated and unmaintained. They said they'd take care of it.
It's been five weeks, and that has not happened. I've likely been negligent in not following up with them about it sooner, but that's in the past. I'd normally leave it be, and I wanted to, but it's turning into a breeding pool for mosquitoes and other bugs. I've talked with them about it, asking whether they're still planning on maintaining it, commenting that it's starting to breed bugs - but I've gotten only lukewarm responses.
The landlord does not know about this pool. I was nudged into one of those "forgiveness over permission" implicit social contracts with the other tenants, and the landlord was never informed. Though, it should be noted that the pool blipped on the landlord's radar via an abnormally high water bill for the month. It's not a small pool. While I do pay my share of this bill, I was willing to do it in order to avoid setting a bad social precedent early on. It's $10-15, and I'm willing to pay $10 to maintain amicable relations. (The landlord contacted us all, asking what was up with the water bill, but it's so far that email has been met with radio silence.)
But this does also mean that deflating the pool and inflating it only when it's going to be used is non-viable. It's about $55-70 net worth of water to properly set up, and we live in a drought region.
I'd like to stay on good terms with the residents. They are nice people, and I do have to live on shared property for the next year. But it's, well... a problem that's only going to get worse. On top of that, I am actually good friends with the landlord, and I'm not sure how my choice to not inform them will be received, and reflect on me. I would like to stay on good terms with them as well, both as a tenant for recommendation reasons, and a friend, because I just flat like them.
The reason I'm asking here is because I consider this a social problem rather than a legal one. There is both a contractual mechanism in place and a city code violation process that I could engage, but involving the law over a backyard pool is just about the coldest, silliest thing I could do, and I'd really rather not. I'd rather slather peanut butter on myself, put on a jester hat and zoot suit, and shout bug-themed obscenities through their open windows while jumping up and down in the pool than do this. (To clarify: this is not a normal activity for me.)
As I mentioned above, I've already tried the "gentle nudge/reminder" approach. I'm not sure what's appropriate from this point forward.
I'm looking both short term and long term here: what do I do right now, and what can I do later on if that doesn't work, or if the group is unresponsive? At what point is it socially reasonable for me to have done my due diligence, and escalate the issue?