Does Your Tap Water in
Denver Have A Chlorine Smell?

As a halogen, chlorine is highly effective at removing harmful microorganisms from drinking water. In Denver, however, water is primarily disinfected using chloramines, a combination of chlorine and ammonia designed to keep water safe as it travels from mountain reservoirs through the distribution system.

In addition, chlorine does something other disinfecting methods do not – it provides a residual effect.

After treatment, water still may need to travel long distances to storage tanks and distribution systems. In places where water is not used, the chances of pathogen regrowth increases. This can cause a major mess, including slime and biofilms that could contaminate all of the clean water being distributed through the system. The residual effect of chlorine helps to prevent this from happening.

Current studies show that drinking water with a small amount of chlorine does not cause harmful health effects. While this is true, some people are more sensitive than others to chlorine and other environmental differences, and there is a concern of long- term risk of cancer due to chronic exposure of trihalomethanes, which is a byproduct of the disinfection.

This has some communities looking at other options. Las Vegas has emulated many European and Canadian cities in switching over to harmless ozone instead of chlorine.

Ozone is effective over a wide pH range and is very powerful, however, there are higher operational costs.

Many Denver homeowners notice a chlorine-like smell in their tap water at certain times of the year. This is often linked to seasonal shifts in water sources, such as changes in snowmelt runoff, which can impact how water is treated.

Because Denver’s water travels long distances from mountain reservoirs, disinfectant levels may be adjusted to maintain water quality throughout the system. Even though chloramines are more stable than chlorine, they can still create a noticeable taste or odor in some homes.

Chloramine is a chemical variant of chlorine that contains ammonia. It is commonly used in municipal water systems because it lasts longer in distribution systems compared to chlorine alone.

In Denver, chloramines are the primary disinfectant used. This is especially important because water must travel across a large service area from mountain sources before reaching homes.

While both chlorine and chloramine are effective for disinfection, chloramines tend to:

Some populations, including those with sensitive skin or respiratory concerns, may be more affected by chloramines.

Water utilities typically use chloramine as a secondary disinfection method to ensure germs and other pathogens are removed from the water supply. It is most often used as a replacement for traditional chlorine, which can cause build up over time.

In systems like Denver’s, where water travels long distances from reservoirs to homes, chloramine is preferred because it remains stable over time and continues protecting water quality throughout the distribution system.

While effective, chloramine can still contribute to taste and odor concerns, which is why some homeowners look for additional filtration solutions.

If you notice a chlorine-like smell or taste in your water, you may want to consider filtration options designed to reduce chloramines.

This is a common concern in Denver homes, especially for those sensitive to disinfectant taste or odor.

Effective solutions include:

These systems are designed to reduce chloramines and improve overall water quality throughout your home.

Denver’s drinking water is disinfected using chloramines, a combination of chlorine and ammonia that helps maintain water safety as it travels from mountain reservoirs to homes.

Because the system covers a large geographic area, chloramines are used instead of chlorine alone since they remain effective longer in the distribution system.

Even though chloramines are less harsh than chlorine, they can still cause:

Many Denver homeowners choose advanced filtration, such as reverse osmosis or whole-house carbon systems, to reduce chloramines and improve water quality.