Water Quality Report

Our goal is to provide you with a safe and reliable supply of drinking water. Castle Rock's water quality reports or "consumer confidence reports" are produced annually to describe the overall quality of water from its raw collection and storage to the treated purity at your tap. Water quality tech in lab

We are pleased to report Castle Rock had no health-based violations or formal enforcement actions for the current reporting period.

Water quality measures involves complex testing, chemistry and engineering. Eliminating all elements and compounds from water is unrealistic and is not always desirable. If we removed everything from our water and supplied pure H2O, this would not be good for your health. To ensure safe water quality, there is significant monitoring and reporting at the local, State and Federal level. We conduct daily, monthly, quarterly and annual testing throughout the year to analyze the quality of water throughout the water treatment and distribution process. Customers can view one of our water quality testing labs when taking a tour of the Plum Creek Water Purification Facility.


Castle Rock Water uses chloramines as a secondary disinfectant instead of chlorine alone as it lasts longer in the distribution system and produces fewer disinfection byproducts than chlorine alone. This water disinfectant, like chlorine, requires that dialysis patients and people who have fish take precautions before using treated water. Because of this, some of our customers may have questions about chloramines.


Castle Rock Water does not have lead concerns. Lead is not found in the distributed water, but enters the water through contact with plumbing pipes and fixtures within the home. It does this by leaching through the corrosion of pipes, solder, faucets and fittings. Since testing began in 1992, Castle Rock Water has only found one case in which private plumbing corroded to the point the fixture needed to be replaced.


You may have heard about PFAS in the news and have questions. PFAS, an abbreviation for perfluoroalkyl and polyfluoroalkyl substances, is a common term for a group of human-made chemicals found in everyday products. Thousands of these chemicals are used to manufacture products sold globally and have been around since the 1940s. These products were originally created to make our lives easier, as they are resistant to water, grease and stains. Researchers, however, have found that there may be health effects associated with exposure to some PFAS. Where are PFAS found graphic

PFAS are commonly found in firefighting foam, fast food wrapping, shampoos, water-resistant fabric and other manufactured items. Use of these industrial and consumer products is how PFAS are introduced into our water supplies. Controlling PFAS at the source is the best way to keep it out of the environment. In 2022, the Colorado Legislature passed laws to begin phasing out the use of these chemicals in manufacturing.

Find EPA PFAS information, including a PFAS Strategic Roadmap with expected regulatory dates at the Environmental Protection Agency website.