Off-Grid · Water · Wells & Springs
An Existing Well or Spring: The Jackpot
If the plot already has a well (puits) or a captured spring (source), you've found the cheapest water you'll ever have — a pump, a bit of pipe, and you have water flowing on day one. A lot of old French houses were built to their own source long before mains arrived, so "no mains water" here often means the water's already on site, free, waiting for a pump.
This is the outcome you're hoping to find when you buy. Nothing else on the water cost table comes close — and it's why "check for a well" is one of the first things to do on any candidate.
Granite country is spring country. The Morvanand the Limousin sit on rock that sheds water into countless springs and shallow wells, and their old stone houses were built to use them. When an agent mentions a puits or source almost in passing, take it seriously — it's worth real money.
All four routes to water compared over 5, 10 and 20 years — see why an existing source wins outright.
Read the hub →🌧️ Rainwater harvestingThe obvious backup or top-up if the well's yield is tight in a dry summer.
Read the guide →🕳️ A drilled boreholeThe expensive fallback if there's no well on the plot — the homework to do before you spend.
Read the guide →Bringing one back into use a day's job
A pump, a pipe and a pressure vessel
Most disused wells just need reconnecting: a submersible or surface pump, a rising main, and a pressure vessel so you get steady flow at the tap. The pump runs off your solar, so once it's in, the water is effectively free. For garden, loo and washing you can be up and running the same afternoon.
Clear it and check the flow first
An old well may need clearing of silt and a look at how fast it refills — the yield. A well that's fine for a garden might be tight for a whole household in a dry August, so watch it over a season if you can, and know its low-summer level before you lean on it for everything.
A spring needs a proper catchment
A source is a spring captured into a small chamber (a captage) and piped down by gravity or pump. If the old catchment is broken or open to surface run-off, rebuild it properly — a clean, covered catchment is the difference between lovely spring water and a puddle full of whatever ran off the field above.
Test it before you drink it non-negotiable
Good-looking water can still be unsafe
Well and spring water can be superb — or carry nitrates from farmland, bacteria, or run-off from something uphill. Before you drink it, get a potabilité lab test. If it passes, wonderful. If not, a treatment train makes almost any source safe. Never assume clear water is clean water.
Know what's uphill
Water carries whatever sits above it — a neighbour's field, a septic drain, a lane. Part of trusting a source is knowing the land above it, the same instinct as the ground check: read how the plot sits, not just the plot itself.
What it costs
DIY ranges for bringing an existing source into use. This is the frugal end of the water table.
- £200–600A pump, rising main and pressure vessel to bring an existing well or spring to the tap.
- £100–300A potability test, plus a simple treatment stage if it needs it before drinking.
- ~£300 / decadeThe occasional pump replacement. Otherwise, near-free water for the life of the house.
Water sorted — what's next?
A well is one system of four. Power, waste and a first warm room finish the job of making a wreck liveable. See the whole build.
The whole off-grid build →