Do low-flow toilets and showerheads actually save money on Toronto water bills?

Yes, low-flow toilets and showerheads do save money on Toronto water bills — and the savings are more significant than many GTA homeowners realize, especially given Toronto's combined water and wastewater billing structure where you pay for every litre both coming in and going out.

Toronto Water charges a combined water and wastewater rate that, as of 2025–2026, totals approximately $4.50–$5.00 per cubic metre (1,000 litres). This is important context because when you reduce water consumption, you save on both the supply charge and the sewage charge — effectively doubling the impact of every litre conserved.

Toilet Savings

Toilets are the single largest water consumer in any GTA home, accounting for roughly 25–30% of total household water use. The math is straightforward. An older toilet (pre-2000) uses 13–20 litres per flush. Ontario's current standard is 4.8 litres per flush, and high-efficiency dual-flush models use as little as 3 litres for a light flush and 4.8 litres for a full flush.

For a household of three people averaging 5 flushes per day each, replacing a single 13-litre toilet with a 4.8-litre model saves approximately 44,895 litres per year. At Toronto's combined water and wastewater rate, that's roughly $200–$225 per year in savings from one toilet alone. A dual-flush model pushes savings closer to $250–$275 annually. If your home has two or three older toilets, you could save $500–$800 per year.

A quality low-flow toilet in the GTA costs $300–$800 installed (including removal of the old unit, new wax ring, and supply line), meaning the payback period is often under two years — sometimes under one year for older, high-volume toilets.

Showerhead Savings

Older showerheads flow at 9–15 litres per minute, while current low-flow models deliver 6–7.5 litres per minute with excellent pressure thanks to modern aerator and laminar flow technology. The days of weak, unsatisfying low-flow showerheads are largely over — quality brands now produce low-flow heads that feel comparable to higher-flow models.

For a household where two people each take a 10-minute shower daily, switching from a 12 LPM head to a 7.5 LPM head saves approximately 32,850 litres per year — translating to roughly $150–$165 in annual water savings. You also save on water heating costs, since you're heating less water per shower. Natural gas or electric water heating savings add another $75–$150 per year depending on your water heater type and energy rates.

A quality low-flow showerhead costs just $30–$100 and is a simple DIY swap — unthread the old one, wrap the threads with Teflon tape, and thread on the new one. The payback period is measured in weeks, not years.

The Combined Impact

For a typical GTA household replacing two older toilets and two showerheads with low-flow alternatives, total annual savings typically range from $500–$1,000 in combined water, wastewater, and water heating costs. Over a 10-year period, that's $5,000–$10,000 — a substantial return on an investment of roughly $800–$1,800.

During a bathroom renovation is the ideal time to make these upgrades since you're already replacing fixtures. Every toilet and showerhead installed in a GTA bathroom renovation today should be low-flow — it's both the Ontario code standard and the financially smart choice. Your bathroom contractor will specify appropriate fixtures as part of the project scope.

Toronto also periodically offers water conservation rebates through Toronto Water — check the City of Toronto website for current programs, as rebates of $50–$75 per qualifying toilet have been available in recent years. Need help finding a professional bathroom renovator? Toronto Bath Remodeling can match you for free.