laboratory flasks with clear liquid

​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.

Increased Taste and Odor at Wes Brown (Update 9/15/20): The city is currently seeing increased algae growth in our water storage reservoirs. These algae can produce aesthetic taste and odor issues in the drinking water; customers may notice a musty or dirty flavor in the water. The city continuously monitors the raw water and makes necessary adjustments to the treatment process to minimize any disruption for our customers. However, despite staff's best efforts, the Wes Brown water treatment plant has seen higher levels of taste and odor compounds in the drinking water over the past few weeks. The water remains safe to drink during these events, but it is understandable if you have lingering concerns.  You are encouraged to contact Water Quality for more information.

Water testing handbills (update 10/13/20): Occasionally independent businesses may solicit water testing, filtration and other services. In recent weeks, we have received an increased number of calls from residents regarding these services. These businesses are not affiliated with the city in any way. As always, please feel free to contact the Water Quality Laboratory with any questions about your water.

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.