Description
The E. coli Water Test Kit uses a culture medium and colour-forming reagent to screen water samples for Escherichia coli, commonly called E. coli. E. coli is used as an indicator of possible faecal contamination in drinking water. This kit provides an initial screening result; it does not identify a particular E. coli strain or provide a complete assessment of water safety.
What’s Included
Each test includes:
- One test bottle.
- Test powder.
- Instructions and a colour reference chart.
The number of tests supplied depends on the pack quantity selected.
Suitable Sample Conditions
Use a fresh, clear water sample with a pH close to neutral. Strongly acidic or alkaline samples can affect the result.
Follow the specified sample volume, preparation method and incubation conditions. Incorrect sampling, contamination during handling and unsuitable sample conditions can affect test performance.
How to Use the E. coli Water Test Kit
- Wash your hands before handling the kit. Avoid touching the inside of the bottle or cap.
- Open the bottle only when ready to begin. Start the test within two hours of opening to minimise contamination from the surrounding environment.
- Prepare the supplied test powder in the bottle as directed on the instruction sheet. Add 40 mL of the water sample.
- Secure the cap and shake until the powder has dissolved.
- Keep the bottle upright, away from direct sunlight, at approximately 25°C for 48 hours.
- Read the colour through the closed bottle and compare it with the supplied chart.
The two-hour opening limit applies to starting the test. It does not replace the 48-hour incubation period.
The 48-hour reading time applies to the approximately 25°C method. Do not assume the same final reading time applies at lower temperatures.
Understanding the Result
Light yellow — negative screening result
The colour corresponds to a negative result under the stated test conditions. False-negative results are possible, so this does not prove that E. coli is absent or that the water is safe to drink.
Yellow-green — weak positive screening result
The colour corresponds to the manufacturer’s weak-positive category. Seek advice about further investigation and laboratory testing.
Blue-green — positive screening result
The colour corresponds to the manufacturer’s positive category. Seek advice about further investigation and laboratory testing.
Colour intensity should not be used to calculate bacterial numbers or identify a particular strain. If the colour is unclear or does not match the chart, do not assume the result is negative.
Storage and Shelf Life
Store unused kits in a dry place, protected from light, at 2–30°C. The manufacturer lists 2–8°C as the optimal storage temperature.
Unopened shelf life is 24 months, subject to the labelled expiry date. Once the bottle is opened, start the test within two hours.
Do not use expired powder or powder showing moisture absorption or unexpected darkening.
Important Test Limitations
This product provides an initial screening result. It does not:
- Establish that water is safe to drink.
- Identify harmful strains, toxins or a specific E. coli type.
- Provide a bacterial count.
- Assess other chemical or microbiological contaminants.
- Replace laboratory testing required for regulatory or compliance purposes.
A negative 40 mL screening result does not demonstrate that a 100 mL sample meets the E. coli guideline for drinking water.
Handling and Disposal
Keep the test kit away from children, pets and food. Avoid contact with eyes and skin, and wash your hands after handling the kit.
After a negative result: Once the full testing period is complete, keep the bottle tightly capped and place all used test items in a securely sealed plastic bag. Dispose of the sealed kit with household rubbish only where permitted by current product instructions and local waste requirements.
After a positive result: Do not reopen the bottle. Keep it tightly capped and place all used test items in a securely sealed plastic bag. Contact your local water provider or health authority for advice about the result and next steps. Obtain disposal guidance from your local council or waste service.
Do not pour the test mixture into a sink, toilet or drain.
For more information on the Allora E-coli Water Testing Kit, visit our Frequently Asked Questions Page: Water Test Kit FAQs
FAQ's
The E. coli Water Test Kit uses test powder, a 40 mL water sample and a colour chart. Prepare the test according to the instructions, incubate it for 48 hours at approximately 25°C, then compare the colour through the closed bottle. Treat the result as initial screening rather than confirmation of drinking-water safety.
For the room-temperature method, read the result after 48 hours at approximately 25°C. Do not interpret an early yellow colour as a completed negative result. Different incubation temperatures can affect colour development, so follow the specified conditions rather than assuming the same reading time applies.
The manufacturer’s chart identifies light yellow as negative, yellow-green as weak positive and blue-green as positive. Compare the sample with the supplied chart under suitable lighting. These categories do not provide bacterial counts or identify a particular E. coli strain.
No. False negatives are possible, and this test does not assess every contaminant that may affect drinking water. The Australian Drinking Water Guidelines specify that E. coli should not be detected in a 100 mL sample. A negative result from this 40 mL screening test does not establish that requirement has been met.
Use an alternative safe drinking-water supply while seeking advice about suspected contamination. Contact your water provider, local health authority or council environmental health officer about investigation and appropriate laboratory testing. Keep the test bottle closed and securely contained while obtaining disposal advice.
The manufacturer specifies fresh, clear water samples with a pH close to neutral. The water source alone does not establish suitability. Contact Allora before testing disinfected or chemically treated water, or samples that are cloudy, strongly coloured, acidic or alkaline. Laboratory testing may be more appropriate for assessing a drinking-water supply.
The colour result does not identify a particular strain or establish whether toxin-producing E. coli is present. The kit should not be used to distinguish harmful from harmless strains. Ask a laboratory about suitable testing if identification of a specific strain or toxin is needed.
