Sealing Concrete Water Tanks

Concrete water tanks are a durable and sustainable choice for water storage, but even the strongest structures need protection. Over time, water can seep through porous concrete, causing leaks, contamination, and structural damage. Sealing concrete water tanks is essential to preserve water quality, extend the life of your tank, and reduce costly repairs. At North Coast Water Tanks, we specialise in providing professional tank sealing services that meet the highest Australian standards, ensuring your water stays clean, safe, and secure.

Why Seal Concrete Water Tanks?

Concrete, by nature, is a porous material. While it offers great strength and longevity, it is susceptible to water infiltration and bacterial growth if left unsealed. Here are the key reasons why sealing your concrete tank is vital:

Prevents Leaks and Structural Damage

Over time, untreated concrete tanks can develop micro-cracks, allowing water to seep through. This not only results in water loss but can also weaken the structural integrity of the tank. Sealing creates a waterproof barrier that stops leaks and prevents deterioration.

Improves Water Quality

An unsealed tank is more prone to algae growth, bacterial contamination, and sediment intrusion. Sealing ensures that the water stored inside remains pure and safe for household, agricultural, or commercial use.

Reduces Maintenance Costs

Leaky or unsealed tanks often require frequent repairs, cleaning, or complete replacements. A one-time professional sealing service significantly cuts down long-term maintenance costs and hassle.

Boosts Tank Longevity

Sealing enhances the tank’s resistance to weather conditions, ground movement, and internal pressure. This added layer of protection extends the overall lifespan of the tank.
Explore our full range of water tank maintenance services to keep your system operating at peak performance.

High-Quality Materials

We use only premium-grade sealing materials that comply with Australian safety and environmental standards. These include:

Water-based, non-toxic sealants safe for potable water use
Elastomeric compounds that allow flexibility and resist cracking
Antimicrobial additives to deter algae and bacterial growth
UV-resistant coatings for above-ground tanks exposed to sunlight

Every material we choose is rigorously tested for durability, chemical resistance, and long-term performance in Australian conditions.

Our Sealing Process

At North Coast Water Tanks, we take pride in our methodical and transparent approach. Our sealing process is designed to ensure maximum protection and performance:

Comprehensive Inspection

We begin with a thorough inspection of your tank to assess its current condition. This includes identifying cracks, leaks, existing sealant failures, and any signs of structural wear.

Surface Preparation

To ensure a strong bond, we prepare the internal and external surfaces of the tank by cleaning them of algae, debris, and contaminants. Any cracks or holes are repaired using appropriate patching compounds.

Application of Primer

A high-quality primer is applied to the concrete surface to increase adhesion and prepare the area for sealing.

Sealant Application

We apply an industry-grade, non-toxic, water-resistant sealant evenly across the tank’s interior (and exterior, if required). Depending on the tank's condition, multiple coats may be applied for optimum effectiveness.