A water tank is one of the most overlooked pieces of equipment on a Jamaican property — until it fails. Most failures give you weeks of warning, if you know what to look for. Here are the five signs we see most often when homeowners call BuildLink for an emergency replacement.
1. Visible green tint on the inside walls
If you can see green or brown growth when you open the manhole, the UV barrier on the tank is failing. Black tanks are designed to block sunlight; once they start letting light through, algae takes over within weeks.
2. Hairline cracks at the seam or fittings
Run your hand around the bottom seam and around every threaded fitting. Hairline cracks feel like small ridges and usually leak intermittently — you might only see a wet patch on the slab once a week. They almost always get worse, not better.
3. Sediment in the bottom of the tank
Some sediment is normal. A thick layer that you cannot vacuum out usually means the tank surface is breaking down. Pieces of plastic or fibreglass in the sediment are a clear replacement signal.
4. The tank is more than 15 years old
A quality polyethylene tank lasts 15–20 years in the Jamaican climate. Older fibreglass tanks can fail sooner, especially if the gel coat has degraded. If you do not know how old the tank is, look for the moulded date on the side.
5. The water tastes or smells off
If the water smells musty or has a plastic taste, and your filtration is in good shape, the tank itself is the problem. This is especially common with tanks that have been in direct sun for years.
Final word
Replacing a 600-gallon tank in 2026 typically runs J$80,000 to J$140,000 installed, depending on access. If you are seeing two or more of these signs, get a quote — a tank that fails suddenly almost always damages something else on the way down. BuildLink can connect you with verified plumbers who handle tank replacement.
