City of Denison Public Water Systems Water Quality Report

DID YOU KNOW water quality reports, also known as “Consumer Confidence Reports (CCRs),” are annual documents that all public water systems are required to provide to you via mail and online. These reports are supposed to provide important information about the quality of the drinking water delivered over the previous year.

They can be difficult to read or understand. They are often many pages long and contain complex tables and charts. Culligan Water wants to change this and help you MAKE SENSE OF YOUR WATER.

This easy-to-read report will provide you with the following:

Denison produces an average of 4 to 10 million gallons of drinking water per day using conventional treatment processes that meet TCEQ and USEPA requirements. Water quality is monitored throughout the process to confirm treatment is performing as intended before water leaves the plant.

Denison also performs routine distribution system sampling and reports results to state and federal regulators. The system collects samples at 30 sites per month in the distribution system, and staff involved in treatment, sampling, and repairs are TCEQ-certified through training and testing.

Denison’s drinking water supply is sourced from surface water. The system treats water from city-owned Lake Randalland also receives a water transfer from Lake Texoma, located in Grayson County. Source water assessments indicate some source waters can be susceptible to certain contaminants, which is why ongoing monitoring and treatment are required.

Denison uses a multi-step treatment approach that includes coagulation, sedimentation, filtration, and disinfection. Disinfection is performed with chloramine compounds before water leaves the plant and enters the distribution system.

Denison’s tap water contains naturally occurring minerals and secondary constituents that can influence taste, scaling, and overall water “feel” in the home.

Hard water can lead to scale buildup on fixtures and inside appliances, and higher dissolved solids can impact taste. That’s why many homeowners consider softening and filtration for comfort, appliance protection, and taste.

Denison’s drinking water meets state and federal standards, but it can still contain trace levels of certain substances that affect taste, odor, or day-to-day water quality in the home. Below are a few common water quality highlights reported in Denison’s 2024 Water Quality Report.

Some contaminants are monitored closely because they can be present at trace levels as part of normal water treatment. Denison reports these results to help track long-term water quality and treatment performance. While the 2024 results shown remain below EPA limits, these disinfection byproducts can still be a concern for some households over time.

Denison’s water is considered hard, with a reported total hardness of 246 mg/L as calcium carbonate (CaCO₃). Hard water isn’t a health concern, but it can leave mineral buildup on faucets, dishes, and appliances — and it can make soaps and detergents less effective. A water softener helps reduce scaling, improves lather and rinsing, and can help plumbing and water-using appliances run more efficiently over time.

Denison’s 2024 report includes an Unregulated Contaminants Monitoring Results (UCMR5) section, and in the results shown, lithium was the only contaminant reported as detected. No PFAS results are listed as detected in that UCMR5 section. Even so, PFAS remain a broader concern across the U.S. as monitoring expands, and many homeowners choose proactive filtration for added peace of mind.

Here are a few other reported water quality characteristics from Denison’s 2024 report that weren’t covered in the cards above.