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Water Quality
Water quality testingAbout
The City's drinking water comes from the North Texas Municipal Water District (NTMWD). Lake Lavon is the main water source for the district. Additional water supplies are available from Lake Texoma on the Red River and Lake Cooper in east Texas.

Water quality is regulated by the State of Texas. The City of Allen is rated as a Superior Water system, the highest level possible.

Sampling / Testing
The City's water supply is sampled monthly, per state and federal requirements. Utility staff take more than ninety water samples each month to ensure the citizens of Allen always have a safe, potable water supply. 


Monitors measure chlorine levels 24 hours a day. Pump station operators can change chlorination levels based on the results. Water samples are collected throughout the City and taken to NTMWD for bacteriological testing.

Storage Tank Maintenance
Regular maintenance of water storage tanks help maintain the City's quality water supply. To keep the tanks in top working condition, the inside and outside of tanks must be painted regularly.

Cross Connection Prevention
Building codes require a permit for a backflow device, which helps eliminate cross-contamination of the water system. The Water and Sewer Division closely monitors and these devices, especially those in high hazard areas such as restaurants or dentist offices. The City and state require a Backflow Test Report to be completed every six months or a year, depending on the location. Any certified plumber may perform this test. Residents may also choose from a list of backflow testers.

water sewer line