What happens if I don't change my whole house water filter?

Author: Lillie Boehm  |  Last update: Saturday, December 6, 2025

If you do not replace it on time, pollutants such as bacteria, pesticides, lead, fluoride, and many others, can build up inside the filter. As the filters clog, it becomes harder for the water to pass through the system. This decrease in flow can have a dramatic impact on the water pressure inside your pipes.

How long can you go without changing your water filter?

Filters in residential settings should be changed every 6 to 12 months. Reverse osmosis, membranes, and additional alkalisers only need to be changed ever 2 years or 4 years, respectively.

What happens if you drink water from an expired water filter?

This means that bacteria like E. coli and Legionella, as well as giardia and cryptosporidium could be waiting in the wings — ready to make its way into your morning cup of water.

What happens if you haven't changed your water filter in 3 years?

The buildup of organic matter can begin to impact your overall water quality, leading to unpleasant odors and tastes. Continuously drinking water that's been contaminated by harmful bacteria can lead to severe health risks, including diarrhea, nausea, fatigue, and an overall weakened immune system.

How often should a whole house water filter be changed?

What is the replacement schedule for a whole house water system? The pre-sediment filter should be replaced every 3 to 6 months. If your water filtration system has a sub-micron-post filter, it should be replaced every 9 to 12 months. If your system has a salt-free water softener it should be replaced every six years.

How and when to change a water filter

What happens if you don't change your whole house water filter?

It's simple, really. If you don't replace your water filter, contaminants will clog the filter, leaving no room to capture any other chemicals or particles, which will then flow out along with the water.

How do I know if my water filter needs replacing?

You may start to hear hissing, bubbles, or irregular water flows coming from the outlet or tap. This can be a sign of your filter needing replacement. Try draining your system or flushing it out, otherwise move on to the last step in the troubleshooting process.

What happens if you forget to change your water filter?

Over time, this can lead to unpleasant odors and peculiar tastes in the water. Additionally, the water flow may become sluggish, and the efficiency of your filtration system could diminish. It is crucial to regularly replace the water filter to maintain optimal performance and ensure clean, refreshing water.

Can a water filter last 5 years?

Here's a breakdown of their average lifespans: Pre-Filters and Sediment Filters: 6 to 12 months. Carbon Filters: 6 to 12 months. Reverse Osmosis Membrane: 2 to 5 years.

What happens if you don't replace filter?

Unhealthy and Poor Air Quality

Unkempt air filters may negatively affect indoor air quality by spreading pet dander, dust, and other allergens throughout your home. This may lead to irritated eyes, nose, and potentially breathing problems.

Can you get sick from not changing your water filter?

Health Risks: Drinking from an old filter can expose individuals to harmful chemicals and heavy metals that the filter was initially designed to remove. This can lead to health issues, especially in vulnerable populations like pregnant women, children, and the elderly.

Can bacteria grow in water filters?

Filters can be a good place for bacteria to grow because there is plenty of water present, filters are dark and warm, and bacteria can feed on the organics present.

Can you drink water right after changing the filter?

As long as you have followed the proper instructions to flush your new water filter with three gallons of water, you can usually drink the water right after you've finished the replacement. Check the instructions for your filter to make sure.

What is the lifespan of a whole house water filter?

Some water systems are designed with quality in mind. These systems will last from 15 to 25 years. Others, which are designed with low upfront cost in mind, will last from 5 to 15 years.

Why is water dirty after changing filter?

If your filters aren't properly rinsed, they can produce cloudy water for weeks after installation. This is due to air and loose carbon being flushed through the system. If you're experiencing this, don't worry, it's an easy fix.

What happens if you don't flush a new water filter?

Flushing a new water filter is necessary to eliminate any initial carbon dust and particles. These impurities can accumulate during the production and packaging of the filter. If not flushed out, they can mix with your drinking water, affecting its quality and taste.

How often should I change my whole house water filter?

Whole House Filters

Water filters for the whole house are installed at your main supply line and feature the biggest filter cartridges. The average whole house filter system requires filter replacements every 6, 9, or 12 months.

How long can a water filter sit unused?

While unused water filters don't have an expiration date, we don't recommend stockpiling them excessively because natural degradation can occur over time, and filter manufacturers often introduce new and improved alternative filters.

Do you really need to replace water filter every 6 months?

Although the 6-month change is standard, the actual lifetime of your refrigerator water filter depends on how many contaminants go through your refrigerator and how much water you and your family consume from the refrigerator supply on a daily basis.

What happens if you drink water from an old filter?

Bacterial Growth: Old water filters can become a breeding ground for bacteria. When a filter reaches its capacity, it not only stops filtering effectively but can also start leeching trapped bacteria and minerals back into the water. That's when you start seeing floaties and other unwanted particles in your water.

Why is my water not working after changing water filter?

If you just replaced the water filter and don't have water from the dispenser, the reservoir tank or tubing has not filled yet. Press the dispenser for several minutes to purge air from the line and make sure all the tubing is filled with water.

How much water do you have to dump after changing a filter?

Run two to four gallons of water through the new filter. This helps prevent your water dispenser from sputtering and clears impurities left over from manufacturing. Check for leaks around the filter. Many filters come with a label to let you keep track of when they need to be replaced.

Is it bad to not change your water filter?

When you use an old water filter your filtration system will not work appropriately. Thus, your drinking water may be filled with chlorine and sediment. The water from your tap may taste funny or smell bad.

How do I know if my whole house water filter is working?

While a sudden change in the taste, odor, or color of your water can indicate that your filter is failing, high levels of important contaminants, such as pathogens, arsenic, lead, and nitrates, are not observable to your senses. The only way to truly know whether or not your filter is working is to test your water.

Do you have to throw out ice after changing the water filter?

Discard the ice cubes produced during the first 24 hours.

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