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.

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.

Elevated taste and odor expected in the drinking water, 9/12/2017: Thornton’s drinking water reservoirs along the South Platte have shown high levels of odor compounds almost all summer.  The hot, dry weather has increased algae growth in the lakes, which in turn has created high amounts of odor compounds in the water.  The treatment plants use powdered activated carbon to remove these compounds, but this is only partially effective.  Even with carbon, most residents will still be able to taste and smell a pondy, fishy or even moldy flavor remaining in the water.  Please be reassured, that even under these conditions, the water is still safe to drink due to the treatment plant processes that are very effective at removing bacteria, viruses and other regulated contaminants.   We do not expect major improvements until late this year.