An E. coli detection means faecal contamination was present in the sample analysed.

The Australian Drinking Water Guidelines state that E. coli should not be detected in any 100 mL sample of drinking water. There is no acceptable low level, so any detection is a non-compliant result.

A detection establishes that a pathway exists between faecal material and your supply. It does not, on its own, tell you four things:

Brown or tea-coloured rainwater tank water is most often caused by tannins — dissolved organic matter from leaf litter in your gutters and tank. On its own, tannin colouration is an aesthetic problem rather than a health one.

But it's rarely worth stopping there, and this is the part most people miss. The same organic matter that colours the water also acidifies it, and acidic rainwater with no mineral buffering is corrosive. That chemistry can dissolve lead, copper and zinc out of your own plumbing and fittings.

So the colour is usually harmless. What the colour indicates often isn't.

A horse that stops drinking is a problem you have hours to solve, not days.

Reduced water intake is a recognised risk factor for impaction colic, and it doesn't take much to trigger it. A horse that finds the water unpalatable will drink less rather than refuse outright — enough to matter, not enough to be obvious. By the time an owner notices, the intake has usually been down for a while.

Most owners on small acreage have never had their water tested. If you moved out of town for the horses, the water they drink is probably one of the few things on the property nobody has checked.

Most producers can tell you what they spend on feed per head. Very few can tell you what's in the water those animals drink every day — even though stock consume far more water than dry matter, and water quality problems show up in production figures long before any animal looks unwell.

The difficulty is that the effects are gradual and easy to attribute to something else. Reduced weight gain, a dip in milk yield, poor conditioning through summer, reluctance at the trough — all of these have a dozen plausible explanations, and water is rarely the first one checked.

If you have ever searched for a home water test kit, you have probably found yourself in the same place most people end up — looking at a $20 strip test on one tab, a $400 lab test on another, and trying to work out whether the difference is worth the price.

It's a fair question. The honest answer requires unpacking what a water test is actually measuring, what the strip is capable of detecting, and what kind of decision you are trying to make on the back of the result.

This article walks through what a meaningful water test involves, where home strip kits work and where they don't, and why laboratory analysis is the only credible option for the contaminants that matter most for drinking water safety. It applies whether your water comes from a rainwater tank, a bore, a dam, or a mains supply.

Black staining or rust-coloured spots inside a kettle almost always come from the water, not the kettle. The two most common causes are manganese, which deposits as a black or dark brown film, and iron, which oxidises to orange-brown spots and streaks. They frequently occur together.

If you've replaced the kettle and the marks came back, that confirms it. A new appliance rules out a failing element or a manufacturing defect and leaves the supply itself as the source.

Irrigation water quality problems rarely announce themselves immediately. A bore, dam, or surface water source that delivers adequate water in year one can be quietly degrading your soil, stressing your crops, blocking your drippers, and reducing your pasture yield — and the cause won't be obvious until the damage is visible and expensive to reverse.

Most Australians drink tap water every day without a second thought. Australia's water utilities are well-run, treatment standards are high, and the Australian Drinking Water Guidelines are among the most rigorous in the world. By the time water leaves a treatment plant, it generally meets those guidelines.

The problem is what happens next.

Most people asking this question have already read something alarming — a news report about PFAS in a local catchment, an update to the Australian Drinking Water Guidelines, or a study linking forever chemicals to health outcomes. They want to know if their water is affected, and they want to know what they can actually do about it.

If you're running a short-term rental, farm stay, eco lodge, or any form of holiday accommodation on a private water supply — tank water, bore water, or rainwater — you have obligations that most accommodation hosts on private supplies aren't aware of.

A private water supply is any drinking water supply that is not provided by a regulated water utility — that is, any supply that doesn't come from a town water main. If your household, business, or accommodation property gets its drinking water from a rainwater tank, bore, dam, creek, spring, or any other independent source, you are operating a private water supply.

Bore water can be safe to drink. Whether yours actually is depends on where you are, what geology your bore draws from, what's happened on the land above the aquifer, and how recently — if ever — your supply has been tested.

Unlike town water, bore water has no disinfection treatment and no regulatory monitoring. There is no authority checking your supply between tests. What comes out of your tap is untreated groundwater — its chemistry is determined entirely by the aquifer it draws from and the land use above it.

For most households using tank water as a primary drinking supply, annual testing is the appropriate baseline. Beyond that, the right frequency depends on your specific situation — your roof type, your location, who is in your household, and whether anything has changed since you last tested.

Every professional involved in a rural property purchase covers their own area. Nobody covers the water.

Buying a rural property is significantly more complex than buying a house in the suburbs. The land itself is a functional asset — it has water sources, soil, fencing, infrastructure, and legal encumbrances that simply don't exist in a residential transaction. The standard building and pest inspection covers the dwelling. Your conveyancer covers the title. But rural due diligence goes well beyond both.

The answer is during due diligence. Here is exactly how it fits.

One of the most common questions from buyers considering a rural property water audit is a practical one — when do you actually order it? Before making an offer? After? During settlement? The answer depends on your situation, but for most buyers the window is clear: after an offer is accepted, during the due diligence period, and before the contract goes unconditional.

Bore water is the most important water source on most rural properties. It is also the most likely to carry a problem you cannot see.

When you buy a rural property with a bore, you are buying whatever is in the aquifer beneath it. That water has been sitting in the ground for years, decades, or longer — dissolving minerals from the surrounding rock, absorbing what has leached through the soil above it, and accumulating whatever has migrated from adjacent land over time. Nobody has been monitoring it. Nobody is required to.

The building inspection checks the structure. The water audit checks everything the building inspector doesn't.

When buyers do due diligence on a rural property, they focus on the things they can see — the state of the fencing, the age of the roof, the condition of the sheds. A building and pest inspection covers the structure. A conveyancer reviews the title. But almost nobody tests the water.

Perth has more residential bores per capita than any other Australian capital city. The Water Corporation estimates that Perth households collectively pump billions of litres of groundwater for outdoor use every year — lawns, gardens, vegetable patches, and in rural areas, pasture and crops.

Perth is unusual among Australian capital cities. While most major urban centres rely on dams and desalination, Perth sits above one of the most productive shallow aquifer systems in Australia — and a significant number of households outside the reticulated scheme use bore water for drinking, cooking, and household use.

Rainwater collected from a roof catchment can be safe to drink. Whether yours actually is depends on factors specific to your property — your roof material, your location, what lives on your roof, and how recently your tank and gutters have been maintained.