“Does anyone know what this might be? It’s located in the back right corner of our garage in a 1952 ranch-style home in California. I’ve tried lifting it, but it’s too heavy for me. Lol” Credit: Lisa Vogt Knapp

Houses that have stood for ages, hiding eternal mysteries and secrets in their cracks and crevices. Those who poke around a building’s crevices and nooks sometimes uncover one of the most interesting hidden secrets: cisterns. These incredible remnants of the past are a reminder of the brilliance of our ancestors and a window into how people once controlled their water supply.

Before Plumbing: The Role of Hidden Cisterns

Before they developed modern plumbing systems, people gathered, stored, and distributed water using different methods. Hidden cisterns — or water cisterns — made up a crucial element of this infrastructure. Builders masterfully embedded date reservoirs beneath the floors of old houses. They constructed these reservoirs within walls or basements, keeping them out of sight.

Hidden cisterns were meant for a singular purpose, the storage of drinking water and a reliable source. These were normal construction practices placing these hidden cisterns outside the home. The cisterns would collect rainwater or water from a nearby spring that served for imbibing, cooking, bathing, and household chores. In areas with unpredictable rainfall, or little access to natural freshwater sources, cisterns were essential. They provided a both durable way to conserve water used and independence on external suppliers.

The Clues Right Beneath Your Feet

But finding an old cistern hidden under an old house can be exciting — like a treasure hunt. It seems to entail examining the house’s architectural details and keeping an eye out for clues that suggest there was a cistern. You are six months pregnant and on your way, one foot in front of the other, to the joyous blog-side! So keep your head up — whatever you do, don’t look down! There you will see the evidence of your ‘condition.’ There are architectural irregularities you have no memory of making, odd paint spatter patterns on the floor, scattered decorative tiles, displaced interior walls, etc.