If you are shopping for a country property in Flamborough, north Burlington, rural Brant, or parts of Niagara, sooner or later a listing will say the home is on a cistern. For a buyer coming from a city on municipal water, that word raises more questions than it answers. This post explains what a cistern is, why so many Southern Ontario homes have one, what tends to go wrong, and what a cistern inspection looks at before you remove your conditions.
What a cistern is
A cistern is a storage tank for household water. Most are concrete, either poured in place or precast, buried beside the house or built into the basement; newer ones are often large polyethylene tanks. Water is delivered by a licensed hauler who backs a truck up to a fill pipe, and the house draws from the tank through a pump and pressure tank exactly as it would from a well. Some older systems also collect rainwater from the roof, though hauled water is the norm today.
Why so many Southern Ontario homes have one
Along the Niagara Escarpment and on the clay plains south of Hamilton, the bedrock aquifer is often too hard, too high in sulphur or iron, or too low-yielding to rely on. Drilling deeper does not always help. Rather than treat poor water heavily or live with a well that runs dry in August, many owners install a cistern and have clean water trucked in. In some areas a cistern is the only practical option; in others a home will have both a poor well for outdoor use and a cistern for the house.
What goes wrong
- Cracked or settling concrete tanks that leak treated water out and let groundwater in.
- Lids at or below grade that let surface runoff, and whatever it carries, into the tank.
- Fill pipes left uncapped and overflows or vents without screens, which invite insects and rodents.
- Tanks that have never been drained and cleaned, carrying years of sediment and biofilm.
- Pumps that cannot hold pressure, waterlogged pressure tanks that short-cycle the pump, and UV or chlorination units switched off because nobody replaced the lamp or refilled the chlorine.
Any one of these can turn a clean truckload of water into water that fails a bacteria test. The good news is that all of them are visible to an inspector who knows where to look, and most are fixable at a reasonable cost.
What a cistern inspection checks
- Locate and access the tank, record its construction and approximate volume, and confirm the lid is sealed, lockable, and above grade.
- Check the tank for cracks, staining, root intrusion, and signs of groundwater entry; assess the interior for sediment where the lid allows.
- Confirm the fill pipe is capped and the overflow and vents are screened and drain away from the tank.
- Run the pump, check the pressure tank and switch, and look for leaks, corrosion, or an undersized pump.
- Inspect filters, softener, UV, or chlorination for condition and whether they are actually operating.
- Sample the water on-site for pH, hardness, iron, and nitrate, and provide a bottle for the free Public Health Ontario bacteria test if you want one.
You also get the practical facts a city buyer does not have: how many litres the tank holds, how long a fill lasts for your household, and how to keep stored water clean between deliveries.
Cistern or well: which inspection do you need?
If the house is supplied by a drilled or dug well, book a well inspection. If a cistern is the only storage, or the well is so poor that the owner has a cistern filled by truck, book a cistern inspection. Many rural properties have both, and they can be inspected on the same visit as the house and the septic system.
Is a cistern a reason to walk away?
No. A sound, well-maintained cistern is a reliable water supply, and thousands of Southern Ontario households live on one without a second thought. What you want is to know the condition of this particular tank, what hauled water will cost you with a local hauler, and what upkeep to budget for. That is what the inspection report gives you.