Experiment On Five Gallon Water Jug With Spout Reveals Potentially Harmful Bacteria

A potentially harmful strain of bacteria was found on a five gallon water jug spout after a refill trip. Water store goers may think twice about transporting their containers without a protective cap or barrier.
By: Milunova LCC
HOUSTON - May 2, 2021 - PRLog -- Do spouts on water jugs get dirty during transport, or at home? And if a Spigcap™ is used, does it create a meaningful difference in cleanliness?

Milunova conducted a comparative test using two five gallon water jugs over a weeklong experiment. One was left exposed and one had a Spigcap™ attached. The water jugs were transported in a car as usual to be filled, then alternated to be placed on a countertop or storage area. One sample of each spigot was taken with a swab and used as a control. After one week, another sample was taken of each spigot and placed on Evviva bacterial agar plates and incubated.

The sample obtained from the spout covered by the Spigcap™ showed some light yellow spotted bacteria growth along the path of the cotton swab. The sample from the open air spout with no cap showed pink to red spotted bacteria growing along the cotton swab path. Interestingly, the most distinct bacteria colony is the pinkish red colony that grew from the sample collected on the spout which did not use a cap. With the limited information available, one possibility is that it is a Gram-negative bacteria which could be worse due to the presence of their outer membranes which protects them from antibiotics and other means to sterilize them.

In addition to water jugs, household items were also tested. One important distinction among the samples is that all the samples except one looked like what may be identified as common household bacteria - either white or yellowish spotted or moldy bacteria. The one sample that did not fit this category is the one which was exposed to the outer elements without a cap or other type of barrier. One possible conclusion is that the spout with no cap was exposed to a bacteria during the refill trip and possibly while being transported.

For a more detailed account of the experiment please visit the Milunova blog:


Spigcap™ is made from durable food-grade silicone which is naturally BPA free, thermally stable, and has low chemical reactivity. It fits tightly around most standard spigots and maintains a barrier from the spout and fluids in the container against dusts, pests, and harmful bacteria. The user friendly design keeps spigots clean and prevents spillage when the container is tilted by clipping on to the stem. Wholesale pricing is also available. Patent Pending.

If you would like to stop worrying about contamination, order your Spigcap™ here:


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