A Simple Way We Mapped Our Yard's Underground Lines Before Picking Where the New Shade Tree Would Go
Our house is one of the older ones on our block, built back when nobody kept great records of where anything got installed underground. When we finally decided to plant a proper shade tree instead of the scraggly little ornamental that came with the place, figuring out where it could actually go turned into more of a project than picking the species did.
I want to be upfront that this was more effort than either of us expected going in. We thought this would be a weekend project, pick a tree, pick a spot, dig a hole. It ended up stretching over about three weeks once you count the time waiting on the utility marking request and chasing down the septic records. Worth it, but I wish someone had told us to budget that much time before we started.
Step One: Call Before You Assume Anything
We called New Jersey One Call, the state's free utility marking service, about a week before we planned to dig. Somebody came out and flagged the gas line, the electric run, and the water service with little colored flags across our side yard. I genuinely had no idea the gas line curved the way it did. In my head it ran straight from the street to the house, and it turns out it jogs around what used to be an old foundation footprint from a shed that was torn down before we even bought the place.
That one visit eliminated almost a third of the yard as safe planting space, just from utilities alone.
Step Two: Figure Out the Septic Situation
Our house is on septic, not sewer, and the drain field was not something One Call covers. We had to dig up the old installation permit from the county health department, which took a few phone calls and more patience than I expected from a records request that should have been simple. Once we had it, we could see roughly where the field sat relative to the house, though the original paperwork was frustratingly vague about exact boundaries.
We ended up calling out our septic service company on their next routine visit and asking them to walk the field boundary with us and mark it more precisely. Twenty extra minutes on a call we were already paying for, and it gave us a much clearer picture than the decades-old permit sketch did.
Step Three: Combine Both Maps Into One Picture
Once we had utilities flagged and the septic field roughly mapped, we walked the yard with both sets of information and sketched out what was actually left as usable planting space. It was smaller than I expected, honestly. What looked like a wide open side yard turned out to have maybe a fifteen-foot-wide strip that cleared both the utility setbacks and the septic field buffer by a comfortable margin.
Step Four: Pick the Species to Fit the Space, Not the Other Way Around
We had originally been leaning toward a bigger canopy species, something that would eventually shade a good chunk of the yard. Once we saw the actual usable footprint, we scaled that ambition down and looked at species with a more moderate root spread that would still handle our wind and salt exposure without needing more room than we actually had clear.
A local arborist we brought in to double check our plan before we bought anything confirmed the spot we picked was solid and flagged one detail we had missed, that the strip we liked best also sat close enough to a low spot in the yard that periodic standing water after heavy rain was worth factoring into the species choice too. Glad we asked before buying.
The One Thing We Almost Skipped
We almost did not bother calling the septic company out separately, honestly. The old permit sketch looked close enough, and part of me wanted to just eyeball a safe distance and move on since we had already spent more time on this than expected. My husband talked me out of skipping it, mostly because the International Society of Arboriculture site he was reading that week had a line about root intrusion being one of the most common and most preventable causes of septic system failure, and preventable problems that cost thousands of dollars later felt worth twenty extra minutes now.
Glad we did not skip it. The precise field marking ended up being almost six feet off from where the old sketch suggested, which would have put our first-choice planting spot right at the edge of the buffer zone instead of comfortably clear of it.
Telling the Neighbors What We Found
We ended up mentioning what we found to the two neighbors closest to us, mostly in passing, and it turned into a bigger conversation than I expected. Neither of them had ever gotten a utility marking done since moving in, years ago in one case, and both admitted they had just been guessing at safe planting spots for smaller shrubs and had gotten lucky so far. One of them said the sewer lateral for their house is apparently in a completely different spot than where the original builder's plans show it, which nobody would have known without actually calling it in.
It made me realize how many of these older coastal blocks probably have the same gap between what the original paperwork says and what is actually in the ground. Records from a house built in the seventies or eighties, especially ones that have changed hands two or three times since, are often more of a rough guide than an accurate map.
What I'd Do Differently Next Time
Honestly, nothing. This process felt like overkill in the moment, especially the septic paperwork chase, but skipping any one of these steps could have meant either damaging something buried or planting a tree that had to come back out a few years later once roots found their way into something they should not have.
If you are on an older lot around here without great records, Rutgers Cooperative Extension has some general guidance on planning around buried infrastructure that is worth a look before you start. We also found it useful to compare notes with neighbors who had gone through something similar with Middletown Tree Service on a nearby property, and the crew at Hufnagel Tree walked our specific site with us before we finalized anything, which caught the drainage issue we would have otherwise missed entirely.
Photo by Dean Fugate on Pexels
Photo by RDNE Stock project on Pexels
One last thing worth mentioning. We kept every flag photo, the county health department paperwork, and the septic company's marked-up sketch in one folder afterward, mostly out of habit, but it turned out to be genuinely useful a few months later when we had a fence company out for an unrelated project and could hand them the same information instead of starting the whole utility marking conversation over again. If you go through this process, save everything somewhere you can find it again.
















