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. And, 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.

April 17th wind storm: Due to the high winds on the afternoon of April 17th, the city lost power to several water pumps which led to a water pressure drop in a significant part of the city.  The change in water flow and pressure re-suspended some sediments in our water lines which many residents are seeing as discolored water coming into their homes.  The water will clear up on its own as the sediments resettle in the main lines.  Running more water in your home (for example, by watering your lawn) may help the water clear up at your home more quickly.  The water remains safe to drink.  Understandably, if you are still concerned about your water quality, please feel free to contact us.  We apologize for any inconvenience this has caused.

Spring 2018 update: The city's Wes Brown Water Treatment Plant is scheduled to come back online in March.  Customers may detect noticeable changes to water quality as the water blends throughout the city.  Taste and odor compounds in our reservoirs have been holding steady at moderate levels but they are not as high as were seen during the summer of last year.  Further, the Thornton Water Treatment Plant is scheduled to go down for maintenance before April.  As the blend shifts to 100% Wes Brown Treatment Plant, another round of noticeable water quality changes is anticipated.  Staff will make all efforts and adjustments necessary to minimize water quality disruptions for our customers, and all waters will still meet or exceed safe drinking water standards.  Customers are encouraged to contact us if they have any questions or concerns.

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