If a parcel isn't on municipal water and sewer, you're providing both yourself. Most first-time buyers price the land and the house and treat water and waste as details. On rural land they're frequently the difference between a project that works and one that doesn't.

First question: is there water at all?

Drilling a well is not guaranteed to find usable water. Depth to the aquifer varies enormously — a well might be 100 feet in one region and 800 in another — and drillers generally charge by the foot whether or not they hit anything productive.

How to find out before you buy, mostly for free:

• Call two local well drillers and give them the parcel location. They drill that ground every week and will usually tell you typical depth, typical cost, and whether there are known dry areas. This single phone call is the most informative thing you can do.
• Check your state's well log database. Many states publish records of existing wells with depth and yield, so you can see what neighbors actually hit.
• Ask the county health departmentwhether a well permit is issuable on that parcel. In some areas it isn't.
• In western states, check water rights separately. Owning the land does not always grant the right to pump groundwater, and some basins are closed to new wells.

What drives the cost

Costs vary too much by region to quote a single number honestly, but the variables are consistent, and knowing them lets you ask a driller the right questions:

• Depth — usually priced per foot, and it's the dominant factor
• Rock — drilling through bedrock costs more than through soil
• Casing, pump, pressure tank and wiring — often a substantial share on top of the drilling itself
• Distance from the well to the house — trenching and line
• Water quality treatment — sulfur, iron, or hardness can require a filtration system
• Access for the rig — if a drilling truck can't reach the site, that's clearing and road work first

Get written quotes rather than working from an internet average. The spread between regions is large enough that national figures are close to meaningless for your specific parcel.

Septic: the permit comes before the price

A conventional septic system needs soil that drains at an acceptable rate, verified by a perc test, plus enough area for a drain field with required setbacks from wells, property lines, water bodies and wetlands.

If the soil fails, engineered alternatives exist — mound systems, aerobic treatment units — but they cost substantially more to install, cost money to maintain every year, and aren't permitted everywhere. Ask the county health department specifically which alternative systems they approve before you assume one is a fallback.

Well and septic constrain each other

They can't go just anywhere, and they can't go near each other. Regulations require minimum separation between a well and a drain field, and both need separation from property lines and surface water. On a small parcel — or one where wetlands eat into the usable area — it's entirely possible to have room for a house but not room for a legal well-and-septic layout.

This is why the buildable-area question is about the whole system, not the house footprint.

What to do before you make an offer

• Confirm with the county whether the parcel is on, or can connect to, municipal water or sewer — if so, most of this goes away
• Call two local well drillers for typical depth and a ballpark quote
• Ask the health department whether well and septic permits are issuable on this parcel
• Make the offer contingent on a passing perc test if there's no sewer
• Add well, septic, and utility runs to your budget as line items before deciding what you can pay for the land itself

Together with the cost of running power to the parcel, this is the number that decides whether cheap land is actually cheap.