Water Tank Maintenance: How to Extend Your Tank's Lifespan

Water tanks are an essential component of many households, especially in areas with limited access to water supply or for those who want to save on their water bills. However, like any other appliance or equipment, water tanks require regular maintenance to ensure that they continue to function correctly and last for as long as possible.

In this blog post, we will provide some tips for maintaining and maximising the lifespan of your water tank and monitoring system, drawn from what we see day-to-day working with tank owners across New Zealand.. We will also answer some of the most relevant questions about water tank maintenance to help you understand the best practices for keeping your water tank in optimal condition.

Types of water tanks

There are several types of water tanks available in the market, and their maintenance needs differ. The most common types of water tanks include:

Plastic Water Tanks - These are the most affordable and widely used type of water tank. They are lightweight and easy to install, making them a popular choice for households with limited space. However, plastic water tanks are prone to wear and tear and can be easily damaged by UV rays from the sun.
Steel Water Tanks - These are sturdy and durable and can last for up to 30 years if properly maintained. Steel water tanks are less prone to UV damage and can withstand harsh weather conditions, making them an ideal choice for areas with extreme temperatures.
Concrete Water Tanks - These are the most expensive type of water tanks and require professional installation. Concrete water tanks are durable and can last for up to 50 years with proper maintenance (read our related post "How long will my water tank last?"). They are ideal for areas with high temperatures and are less prone to cracks or leaks.

To learn more about the different types of water tanks, read our blog post, Which type of water tank is best for the home?

Maintenance tips for water tanks

Whilst you can get a professional in to look after the maintenance of your water tank, there is a lot you can do yourself to help take care of your water tank and extend its lifespan. Here are some maintenance tips you can carry out on a regular basis:

Regular cleaning and disinfection - Regular cleaning and disinfection of your water tank are essential to prevent the build-up of bacteria and other contaminants that can affect the quality of your water. Use a mild detergent and a brush to scrub the inside of your water tank, and then rinse thoroughly with clean water. For disinfection, NZ health guidance recommends adding half a teaspoon of plain, unperfumed household bleach per 10 litres of water. For more information about cleaning your water tank, read our post "How often should you clean your water tank?"
Check for leaks - Regularly check your water tank for leaks or cracks that can cause water loss and affect the performance of your water tank. If you notice any leaks, repair them immediately to prevent further damage.
Inspect valves and fittings - Check the valves and fittings of your water tank regularly to ensure that they are functioning correctly. If you notice any signs of wear and tear, such as rust or corrosion, replace them immediately.
Protect from sun damage - If you have a plastic water tank, protect it from sun damage by covering it with a shade cloth or painting it with UV-resistant paint. This will help to extend the lifespan of your water tank. You can also screen your water tank, both to hide it from view but also to protect it from UV damage. Read more about screening your water tank.
Winterise your water tank - If you live in an area with freezing temperatures, it is important to winterise your water tank to prevent damage from ice formation. Drain the tank completely and disconnect all pipes and fittings before covering it with an insulated blanket.

Routine maintenance schedule for water tanks

To ensure that your water tank and monitoring system function correctly and last for as long as possible, it is important to establish a routine maintenance schedule. The frequency of maintenance may depend on factors such as the type of water tank, water usage, and local weather conditions. However, the following are some general guidelines for maintaining your water tank:

Inspect your water tank for leaks or damage every six months.
Clean and disinfect your water tank at least once a year.
Check the valves and fittings of your water tank every six months.
Test your monitoring system regularly to ensure that it is functioning correctly.
Winterise your water tank before the onset of freezing temperatures.

Choosing a water tank monitoring system

When it comes to choosing a water tank level monitoring system, there are several options available on the market, ranging from simple mechanical float gauges to wireless ultrasonic systems like ours. The right choice depends on your budget, tank type, and how much visibility you want into your water usage.

Smart Water is our own product, so take this section as a maker's perspective rather than an independent review.

Below is an overview of our own system, Smart Water's Water Tank Level Monitoring System, and the features we've built it around.

Smart Water's Water Tank Level Monitoring System Features

Smart Water's Water Tank Level monitoring system offers a variety of features that make it a top choice for monitoring your water tank. These features include:

Accurate and Reliable Monitoring - Smart Water's monitoring system uses ultrasonic sensors to accurately measure the water level in your tank. These sensors are highly reliable and accurate, ensuring that you always have an up-to-date reading of your water levels.
Real-Time Monitoring - Smart Water's monitoring system provides real-time monitoring of your water levels. This means that you can instantly check your water levels from anywhere, using your smartphone or computer. Wireless range is 5–10km line-of-sight as standard, with 15–20km achieved in optimal test conditions.
Customisable Alerts - Smart Water's monitoring system allows you to set customisable alerts that notify you when your water levels reach a certain point. This can help you avoid running out of water and ensure that you always have a sufficient supply.
Easy to Install and Use - Smart Water's monitoring system is easy to install and use. The system comes with a simple and intuitive user interface that makes it easy to set up and operate. Backed by a two-year full replacement warranty.
Long Battery Life - Smart Water's monitoring system has a long battery life, which means that you won't have to replace the batteries frequently. The solar-powered Lithium-ion battery can run for up to 3–6 months with no direct sunlight at all.

Sources: smartwateronline.com/faqs; Smart Water User Manual; smartwateronline.com/products/products

Potential considerations

Like any wireless system, performance can be affected by factors such as WiFi signal strength at the tank's location, tank material (metal tanks can affect sensor placement), and battery replacement over time.

Why tank owners choose a monitoring system

● Reduced water waste – Alerts when levels run low can help you plan usage and avoid running out unexpectedly.
● Better visibility – Real-time data supports more informed water use decisions.
● Convenience – Check levels remotely rather than climbing up to inspect the tank manually.
● Peace of mind – Particularly useful for holiday homes, rural properties, or anyone relying solely on tank water.
"We irrigate a small winery from a 50kL poly tank fed by a dam 400 metres away. We installed our Smart Water tank level system about five years ago — it was an easy, trouble-free installation and has never missed a beat."
— Martin Webb, Camerons Estate Wines, Darley, Victoria

Summary

In conclusion, maintaining and maximising the lifespan of your water tank and monitoring system is essential for ensuring a constant supply of clean water and saving on water bills.

Regular cleaning, inspection, and maintenance can help prevent costly repairs or replacements. Pairing routine maintenance with a monitoring system, whichever one suits your setup, can make it easier to catch issues early and manage your water use with confidence.

By choosing the right monitoring system and following a routine maintenance schedule, you can extend the lifespan of your water tank and improve its performance.

Consider eco-friendly options to reduce your environmental impact and conserve resources.

Frequently Asked Questions

How often should I clean my water tank?

At least once a year, with a full leak and fitting inspection every six months as part of a routine maintenance schedule.

How long does a water tank last?

It depends on the material, plastic tanks tend to have the shortest lifespan due to UV exposure, steel tanks can last several decades with proper care, and concrete tanks are typically the most durable option. (This is where the earlier lifespan citation would slot in nicely.)

Do I need to disinfect my tank, or is cleaning enough?

Cleaning removes visible debris and buildup, but disinfection is a separate step needed to control bacteria. (This is where the disinfectant dosage citation would slot in.)

Is a water tank monitoring system difficult to install?

Not typically, Smart Water's system is designed for DIY installation, though ease can vary depending on tank type and location.

Can a monitoring system work with any tank material?

Generally yes, though tank material (e.g. metal vs. plastic) can affect sensor placement and signal, as noted earlier in the "Potential considerations" section.