laboratory flasks with clear liquid

Current Water Quality Report

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Reporte de Calidad de Agua

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​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 or call the Water Quality Line at 303-255-7770.

Lead and Copper Sampling Program (Update 10/21/19): Water Quality is seeking participants for our annual lead and copper testing program (see program flyer). If you live in a single-family home built between 1983 and 1987 you may qualify for the program. Participants in the program will receive a $25 King Soopers gift card (limited to the first 100 participants). There are two sampling periods each year, so participants may receive up to $50 in gift cards per year! Please contact Water Quality at or 303-255-7770 if you have further questions or would like to sign up.