HOMEWhat Most People Get Wrong About Rainwater8 min read
The Pollution Problem Rainwater Collection Actually Solves
Most homeowners think of rainwater collection purely in terms of personal benefit — cheaper water, healthier plants. But there’s an environmental side that gets less attention. When rain hits a typical suburban landscape, it picks up oil, fertilizer, pet waste, and other pollutants as it flows across driveways and lawns into storm drains. That contaminated runoff eventually reaches streams, rivers, and coastal waters, harming aquatic life. Collecting rainwater before it ever reaches the storm drain system interrupts that pollution cycle. Allen is direct about this: when rainwater runs into the storm drain, it carries land pollution into the water supply. Keeping it on your property — whether in a barrel, a cistern, or a rain garden — means less runoff reaching waterways. For neighborhoods near sensitive ecosystems, widespread residential collection could meaningfully reduce the volume of polluted stormwater entering local watersheds.
Rain Barrels Are the Simplest Place to Start
The most common rainwater collection setup is also the most accessible. Roof runoff travels through gutters and downspouts, which are then redirected into a storage container — typically a 55-gallon plastic barrel or a larger above-ground cistern that can hold 500 gallons or more. Mary Phillips, head of the Garden for Wildlife programs at the National Wildlife Federation, recommends rain barrels as the natural starting point for anyone new to collection. They range from straightforward DIY installations to more complex whole-house systems that filter and disinfect water and connect it automatically to household fixtures. Even renters or apartment dwellers aren’t excluded. Kim Roman, an author and owner of Square Foot Gardening 4 U, notes that simply setting out buckets or bowls during a rainstorm can provide enough water for houseplants — no permanent installation required. The barrier to entry is lower than most people assume.