laboratory flasks with clear liquid

EPA releases drinking water health advisories for PFAS (update 11/1/22):  PFAS are a family of chemicals used in firefighting foams, non-stick cook wear, stain and water resistant fabrics, and a number of other everyday products. These chemicals have made their way into the environment. Click on this link to learn more about PFAS, the updated Health Advisories, what the city of Thornton is doing in response, as well as actions you can take to lower your risk. 

​Water Quality Laboratory

The city of Thornton Water Quality laboratory is charged with ensuring that the city's drinking water meets all state and federal drinking water regulations. Thornton has a qualified staff of water utility professionals that understand the importance a water supply plays in the overall quality of life for its community. They are dedicated to providing customers with the best quality of water that is possible. The water quality laboratory provides water sampling, monitoring and testing using approved procedures and methods in accordance with all regulatory requirements.

Laboratory AnalystTreated water is collected and analyzed weekly at both Wes Brown and Thornton Treatment Plants and in the city of Thornton water distribution system. Raw water sources are also sampled and closely monitored to protect the quality of Thornton's drinking water. In addition to providing safe drinking water for Thornton's customers, the laboratory prepares and distributes an annual Water Quality Consumer Confidence Report and investigates water complaints.


If you have any questions or concerns about your tap water, please email WaterQuality@ThorntonCO.gov or call the Water Quality Line at 303-255-7770.