Greywater Recycling Guide: What's Legal, What Works, and Cost Savings
Quick Answer Greywater is the gently used water from sinks, showers, bathtubs, and washing machines (everything except “blackwater” from toilets). Greywater recycling captures it and reuses it — most commonly for landscape irrigation, and in more advanced setups for toilet flushing. The key facts: ~50-80% of residential wastewater is greywater (showers, laundry, sinks) — a big reusable resource Safe for irrigation when you use biodegradable, low-salt, low-boron products and don’t let it pool or touch edible parts of plants Legal status varies wildly: some states encourage it with simple permits, others effectively ban it Simple systems cost: DIY laundry-to-landscape systems from $100-$1,000; permitted whole-house systems $2,000-$10,000+ Savings: greywater reuse can cut household water use (and sewer/water bills) by 30-50% Bottom line: For off-grid or water-conscious homeowners, greywater irrigation is one of the highest-value, lowest-effort water-savings you can implement — but you must check your local code first, since legality determines everything. ...