Can you use your rainwater tank during council water restrictions? In most of regional NSW, yes, as long as the tank is standalone and isn’t topped up from town water. A tank that tops up from mains, or can be switched over to it, is usually treated as town water. That puts it under the same rules as your garden tap.
That single plumbing detail decides whether your tank keeps your garden alive through a dry summer or sits idle. With the Bureau of Meteorology confirming an El Niño and forecasting a warm end to 2026, now is the time to check it. The good news is that every litre of rain you catch before restrictions arrive is water your Council’s rules generally can’t touch.
Why Council Water Restrictions Are on the Cards This Summer
The Bureau of Meteorology declared El Niño on 16 June 2026. By late July, the Bureau reported the event was still strengthening and could persist into autumn 2027. El Niño tends to bring drier conditions to eastern Australia through winter and spring.
The Bureau’s October to December 2026 long-range forecast is mixed for NSW. It shows below-average rainfall likely for parts of the south-east, while some parts of the east could see above-average falls. Two signals in it affect almost everyone:
- Higher temperatures. Both days and nights are likely to be above average for almost all of Australia, with a higher risk of heatwaves. Hotter weather pushes up garden water use, and that demand is what drains town supplies.
- Low river flows. Streamflow in late September was already below average across the south-east and parts of north-east NSW. Many regional towns draw from rivers, so low flow can trigger council water restrictions even after decent local rain.
None of this means every town will go on restrictions. It does mean the window to install a tank and catch the rain that does fall is now, not after your Council’s notice arrives.
What Triggers Council Water Restrictions (It’s Not Only Rainfall)
Most people link council water restrictions to empty dams. Plenty of regional towns go on restrictions for other reasons, which makes them hard to predict from your backyard rain gauge.
- River flow upstream. Kempsey’s mains supply depends on Macleay River flow, which is fed by rain around Armidale and Walcha. That’s how Kempsey ended up on Level 1 restrictions in October 2023 despite good local rainfall. Our Kempsey water tank guide covers that story in detail.
- Water quality rules. Narrabri township has been on Level 3 restrictions since 6 March 2026. Tighter national limits on PFAS reduced the number of bores Council can use, and demand outpaced what the remaining bores can supply.
- Dam trigger levels. Uralla eased from Level 2 to Level 1 in June 2026after Kentucky Creek Dam filled. Council has said Level 2 returns when the dam falls to 62 per cent.
In each case, the restriction had little to do with how much rain fell on residents’ roofs. Your own tank is the one part of your water supply that responds directly to your own rainfall.
Does Tank Water Count Under Council Water Restrictions?
It depends on two things: how your tank is plumbed, and which council you’re in. There is no single statewide rule. Here is how six NSW water authorities handle it, based on their published restriction rules.
| Council / water authority | Standalone rainwater tank | Tank topped up from town water | Sign needed? |
|---|---|---|---|
| Rous County Council (supplies most of Ballina, Lismore, Byron and Richmond Valley shires) | Not restricted | Restricted | Yes, at the location of use |
| Tweed Shire Council | Not covered by the tank rule. Confirm with Council | Restricted, including tanks refilled by a town-water delivery | Not stated for tanks |
| Tamworth Regional Council | Can be used outside restriction limits | Not eligible for an exemption. A tank installed for BASIX doesn’t count as standalone | Yes, an official Council-approved sign |
| Shoalhaven Water | Restrictions still apply if the property is also connected to town water | Restricted | Not stated for tanks |
| Upper Lachlan Shire Council | Not affected | Restricted if topped up from, or switched to, the drinking supply | Not stated |
| Berrigan Shire Council | Exempt (roof water collected on your own land) | Restricted if the tank is added to with Council-supplied water | Not stated |
The pattern is clear. Councils restrict tank water when it can’t be separated from town water. A trickle top-up valve or an automatic mains switch means the water in your tank could have come from Council’s supply. From Council’s side, that makes it town water.
Shoalhaven Water goes further. Its published answer is that restrictions apply if a property is connected to town water and also has a tank. Fines there can reach $2,200 for repeat offences, so it pays to read your own council’s wording rather than assume.
Setting Up Your Tank to Stay Usable During Council Water Restrictions
If you want your tank to keep working while council water restrictions are in force, three choices matter most.
1. Decide whether the tank needs a mains top-up at all. A top-up or automatic switch makes sense when the tank supplies toilets or laundry and you never want it to run dry. However, the same top-up can bring the whole tank under restrictions. Some households run a separate standalone tank for the garden and keep the topped-up tank for indoor use. If you go that way, see our guide to linking multiple water tanks for the plumbing basics.
2. Check whether your tank was installed for BASIX. Tamworth Regional Council states that a tank installed to meet BASIX requirements is not a standalone tank, so it can’t get an exemption sign. BASIX tanks are commonly plumbed to toilets or laundry with a mains backup. Check how yours is connected before counting on it for the garden. Our BASIX water tank sizing guide explains how those tanks are specified.
3. Ask about signage before you need it. Rous County Council requires standalone rainwater use to be identified with signage where the water is used. Tamworth requires an official Council-approved sign. A sign saves you from a breach report when a neighbour sees a sprinkler running on a restriction day.
One more point for rural blocks: refilling a tank from carted town water gets harder under restrictions. Tweed applies restrictions to tanks refilled by a town-water delivery. During its 2023 Level 1 restrictions, Kempsey Shire Council limited its water filling stations to registered potable water carters. Rainwater caught on your own roof avoids both problems.
Sizing Your Tank Before Council Water Restrictions Arrive
The best time to size a tank is before council water restrictions start, because rain caught now carries you through later. A simple rule helps: 1mm of rain on 1 square metre of roof yields about 1 litre of water.
- A 150m² roof catching 20mm of rain collects roughly 3,000 litres before first-flush and overflow losses.
- The same roof catching 50mm collects around 7,500 litres. A small tank would overflow and waste most of that.
That is why tank size matters more in a dry year, not less. When rain is scarce, you want enough capacity to bank every decent fall. Our water catchment calculator works out the yield for your roof and local rainfall.
Where space is open, a round tank gives the most storage for the floor area. On tighter blocks, a slimline tank fits along a side passage. Our round tank pricing guide and slimline tank pricing guide list current models and prices.
Timing matters too. Lead times on our larger round poly tanks are currently six weeks or more. Ordering now gives the tank time to arrive and start catching rain before restrictions are likely to bite.
How to Check Council Water Restrictions Where You Live
Restriction levels change quickly, so go straight to the source rather than relying on a news story.
- Start with the Bureau of Meteorology’s register. The BOM water restrictions page lists NSW water authorities and their reported restriction levels. Treat it as a starting point, because it relies on each authority to keep its entry current.
- Confirm on your council or water authority’s website. Look for the restriction level, the rules for each level, and any separate wording about rainwater tanks, bore water and signage.
- Ask three direct questions. Is a standalone rainwater tank exempt? Does a tank with a mains top-up count as town water? Do I need a sign, and how do I apply for one?
Getting those answers now means your tank setup matches the rules before the first restriction day, not after.
Frequently Asked Questions: Council Water Restrictions and Rainwater Tanks
Can I water my garden from my rainwater tank during council water restrictions?
Usually, yes, if the tank is standalone and isn’t topped up from town water. Most NSW councils that publish tank rules exempt standalone rainwater. Some, like Shoalhaven Water, apply restrictions to any property also connected to town water. Check your council’s wording.
Is a tank with a mains top-up exempt from council water restrictions?
Generally not. Rous County Council, Tweed, Tamworth, Upper Lachlan and Berrigan all treat tanks topped up with town water as restricted. Once town water can enter the tank, councils can’t separate it from your rainwater.
Do I need a sign for my rainwater tank?
Some councils require one. Rous County Council asks for signage where standalone rainwater is used. Tamworth Regional Council requires an official Council-approved sign. Others don’t mention signage, so ask before restrictions start.
Does a BASIX rainwater tank count as a standalone tank?
Not in Tamworth, where Council states that tanks installed to meet BASIX requirements aren’t standalone. Other councils may differ, so check whether your BASIX tank has a mains backup and what your council says about it.
Will El Niño mean council water restrictions in my town?
Not necessarily. Restrictions depend on each town’s dams, rivers, bores and demand. The Bureau of Meteorology confirmed El Niño in June 2026 and forecasts a warm end to the year, which raises the odds. The practical step is the same either way: get a tank in place and catch the rain that does fall.
Want a tank that keeps working through council water restrictions? Browse the full tank range or call 1300 826 532 to talk through sizing and setup for your block.