If your household runs on rainwater, the useful news this month is simple. The major forecasters now expect a very strong El Niño through our spring and summer. That often means drier weather in eastern Australia, though not always. The practical response is the same either way: check your tank now, while it still holds water, not once it's low.

Here's what the forecasts say, what they don't say, and the short list of checks worth doing this spring.

What the forecasters are saying this month

The US Climate Prediction Center's latest ENSO discussion, issued on 8 October 2026, says El Niño continues to strengthen, with a strong to very strong event likely through January to March 2027. For us, that's spring and summer. It puts an 83% chance on October to December exceeding every El Niño since 1950 in strength.

The World Meteorological Organization agrees. Its latest update gives a nearly 100% probability that El Niño will persist through September to November and December to February, peaking at very strong intensity toward the end of the year.

Closer to home, the Bureau of Meteorology explains that El Niño often brings drier conditions to central and eastern Australia in winter and spring.

Does El Niño mean the Central Coast will be dry?

Not necessarily. This is the part that often gets lost.

The Bureau itself says outcomes vary because other climate drivers also play a role. Its spring outlook, as reported by ABC News, tipped the eastern seaboard to be drier than average. It also described the outlook for the eastern states as mixed, with near-even odds of wetter or drier in parts of NSW. The same report noted that 2026 was on track to be Australia's wettest El Niño year on record, which is a good reminder that the label doesn't decide the weather.

A rainfall figure specific to the Central Coast or Lower Hunter isn't available in the reporting we have, so we won't guess at one.

So, the honest tone is "prepare", not "brace for drought". A strong El Niño makes a dry few months more plausible. It doesn't make them certain. The checks below make sense in a normal spring too.

Why a falling water level is a good time to look at the bottom

Most tanks on the Coast finished winter reasonably full. As the weather warms and you use more water, the level starts to drop.

That matters for water quality, not just quantity. NSW Health notes that as levels fall, bottom outlets are more likely to draw up resuspended sludge and settled sediment. Leaves, dust, bird droppings and roof grit all end up on the tank floor over time. With plenty of water above them, they tend to sit still. With less water, they're easier to stir up.

Tank near full: deep water over a thin, calm layer of sediment on the floor, with clear water drawn from the bottom outlet. Tank near full Sediment Clear water Tank running low: shallow water, the same sediment stirred into a cloudy band near the bottom outlet, with cloudy water drawn from the outlet. Tank running low Sediment Cloudy water

That's why a low-water spell is a sensible time to find out what's down there. You'd rather know now than discover it through the tap in January.

Your spring tank checklist

NSW Health's rainwater guidance gives three routine jobs. None of them need special equipment to start.

Here's how those intervals land for a typical household.

Our estimate, using NSW Health's intervals: if you last cleared the gutters in mid-June, three to four months puts the next clean between mid-September and mid-October. If you last checked the tank floor a year ago, six to twelve months means that check is now due at the latest. For many households, both jobs fall due right now.

For more on how the cleaning itself works, our water tank cleaning tips go through it step by step.

No town water restrictions is not the same as a full tank

Plenty of people assume that if there are no water restrictions, there's nothing to think about. For town water, that's roughly right at the moment. Central Coast Council's permanent Water Wise Rules have applied since 7 December 2020, and no formal drought restrictions are in place. Level 1 restrictions would only trigger if Mangrove Creek Dam storage drops to 50%.

Your own tank sits outside all of that. Council's dam levels tell you nothing about what's in the tank beside your shed, or what has settled on its floor. If you're on tank water, you're your own water authority.

What to have ready when you call Ward Septics

Ward Septics cleans water and rainwater tanks across the Central Coast, Lake Macquarie and the Lower Hunter, including Gosford, Wyong, Wollombi to Spencer and Wisemans Ferry. It's owner-operated, so you'll be talking to Paul.

If your checks turn up a sludge layer, or you simply can't remember when the tank was last cleaned, these details make the conversation quicker:

Call Paul on 0438 315 514, or read more about water tank cleaning first. Better to book while the tank still has water in it and you have time to plan around the job.

Sources