Why does Water Pressure Drop in the Shower When the Toilet is Being Flushed?

Answers to Your Plumbing Questions in Midland and Mundaring

How many things do you take for granted in your everyday life in Midland or Mundaring?

Probably a lot more than you realise – precisely because you DO take certain things for granted, such as:

1. There will always be plenty of coffee for that all-important first cup in the morning.
2. Your favourite TV show will air, on time and on the appointed day, without fail.
3. You’ll always have clean clothes to wear, even if you’re not the one doing the laundry.
4. And, you’ll always have plenty of hot water to take a shower, no matter what the time of day.

Uh, not so fast on #4. If you live in a multi-person household with everyone trying to get out the door at the same time, is there really always enough hot water for everyone? Well, that’s a blog for another time because today we’re going to address another “pain in the shower” event, one that occurs far more often than a sudden loss of hot water. And that’s when the water pressure suddenly drops when someone else is flushing a toilet.

Does this sound familiar? Well, here’s a quick and painless remedy. Turn the toilet’s shut-off valve clockwise, but not all the way to the closed position. This will cause the tank to fill up at a slower rate without any decrease in the flushing pressure. Actually, the explanation is quite simple. You see, the water pressure in the shower drops because water in the cold water supply is being partially redirected to the toilet since they’re both tied into the same supply line. That causes only the cold water supply to falter which further means that, for a few brief but excruciating moments, your shower can become extremely hot.

If that doesn’t solve the problem, you could have a faulty pressure regulator, and that’s a job for the professional plumbers at Kalamunda Plumbing. Solving household plumbing problems is what we do best: a family tradition dating back to 1954.

How can we make your life a little more comfortable and convenient today?


Seen our showroom yet? Visit us at Shop 5B Kalamunda Glades, 121-123 Canning Road Kalamunda 6076

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I have given Kalamunda plumbing 5 stars but only because I couldn’t give them 6!Kalamunda Plumbing we’re absolutely fantastic! I had a burst pipe somewhere on my property (3000 sqm) leaking at 1L per second. I tried 4 different plumbing companies before coming across Kalamunda plumbing. The first company made me wait two days and then forgot my booking, the next one couldn’t help me for over a week and the last quoted me $1200 for the job and still had to wait three days. I called Kalamunda plumbing and they arrived the very next day. Anthony found the burst pipe within 20 minutes to the exact location, dug down and repaired the leak. The whole job only took 2 hours and was 1/3 of the price I was quoted.They were professional, helpful and friendly. I will now be a customer for life. I have shared my experience with all that I know in my area.I cannot recommend them highly enough. Thank you for everything! When the need arises I will be back!
Darian Corazza
Top work . Friendly . Good work , tidyThe dream
david Stephens
Great professional service. Will definitely use them again.
Karen Bertoncini
Great staff that pride themselves on quality work and exceptional service.
Barry Feehan
Needed a gas bayonet relocated and a new basin plumbed in the bathroom. The guys were quick to quote and did a fantastic job. Really easy to work with and good price as well.
Tania Belletty
Excellent service & fair price
Tony James
Job done on time on budget and great advice from a good tradesman's
craig mccullough
We had a large amount of water bubbling up between the pavers down the side of our house. After a quick call around and a few dead ends I got hold of Kalamunda plumbing. They were able to have someone around quickly, dig down and repair the broken water line. Saving me a fortune in wasted water. Highly recommend and definitely will be using for any future plumbing work.
Trent and Barry from Kalamunda Plumbing did an excellent job. As well as fixing the problem in a timely manner, they gave me some good advice on a number of other potential plumbing issues
Roger Barnett
One thing that I really appreciate is a tradesman that arrives when they say they will, especially when you have taken time off work to have your hot water system replaced.Kalamunda Plumbing were on time and I can't believe how quickly the work was done, and at a reasonable price considering that they did an urgent repair for me. Everything was back to normal again so quickly, mess cleaned up and they adjusted the water temperature so that it was not hot enough to scold me.Well done to everyone involved at Kalamunda Plumbing, greatly appreciated.Regards Russell
russ chambers
Kalamunda plumbing’s response was prompted and professional with the staff rolling up on time. The plumber was fully briefed of the tasks on arrival which were completed timely and professionally. The works areas were left clean and tidy. We can highly recommend them to anyone needing good quality plumbing services
John Van Vliet
Friendly and prompt service. They had the issue fixed in next to no time! Will definitely be recommending Kalamunda Plumbing to my friends and family
Erinn Stewart
Excellent service friendly technician good job unblocking and inspection of my sewer. Fair prices these guys have the right equipment to get the job done right.
Mark Kennedy
Very good service. Prompt response time
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Kalamunda Plumbing is a team of professional local plumbers, servicing Perth’s eastern suburbs with a proud history of award-winning customer service since 1954. Get in touch to discuss your solar, plumbing & aircon needs, or visit our Kalamunda Showroom to speak to our friendly team today!