Are Poly Water Tanks Safe for Drinking Water?

Polyethylene water tanks, commonly referred to as poly tanks, have become increasingly popular for water storage, especially in residential areas. With their affordability, durability, and versatility, they offer a practical solution for storing rainwater, irrigation water, and even drinking water. However, a common question arises: Are poly water tanks safe for drinking water?

The answer is a resounding yes—poly water tanks are perfectly safe for storing drinking water. They are manufactured from food-grade, UV-stabilised polyethylene¹ (plastic) material, which means they do not leach harmful chemicals into the water when exposed to sunlight. Additionally, these tanks are designed to meet stringent health standards, making them safe for potable water storage.

Ensure the water tank you choose adheres to the stringent Australian standards for water tanks for peace of mind your water tank is safe for storing drinking water.

But while poly tanks themselves are safe, ensuring the quality of the water inside them is just as important. Rainwater, which is often stored in poly tanks, can be affected by external contaminants such as dust, leaves, and animal droppings, particularly when it’s collected from roofs.

Enhancing Water Quality with Rainwater Harvesting Accessories

To further improve the quality of water stored in poly tanks, there are several rainwater harvesting accessories available. One particularly effective accessory is the First Flush Downpipe Diverter kit. Think of it as a purifier for your rainwater collection system.

When rainwater first hits your roof, it tends to wash off any accumulated dirt, debris, and contaminants from the surface. The first few millimetres of rainfall may contain unwanted particles that can affect the quality of the water. This is where the First Flush Diverter comes in—it diverts this initial runoff away from your storage tank, preventing it from contaminating the water inside.

By diverting the first flush of water, which is most likely to carry pollutants, this device helps to ensure that only cleaner, purer water enters your poly tank. This simple addition can significantly enhance the safety and quality of the water you store, making it even more suitable for drinking and other household uses.

Other suggestions for keeping debris from entering your system include

• Tank Screen Cover
• Leaf Beater Rain Head

In Summary

Poly water tanks are a safe, reliable option for storing drinking water, but to maintain high water quality, it’s essential to implement accessories like a First Flush Diverter. By doing so, you can protect your stored water from contaminants and ensure that it remains fresh and safe for consumption.