Anna Water Hardness & Quality Report (2026)

The City of Anna Public Water System provides water to around 15,000 residents in Collin County, Texas. Its supply comes from a blend of sources, including groundwater drawn from the Trinity Aquifer and surface water managed by the North Texas Municipal Water District (NTMWD). The NTMWD's treatment facilities primarily use water from reservoirs like Lake Lavon and Lake Ray Hubbard, both situated on the Upper Trinity River. Anna itself handles distribution and some treatment, employing chloramines and chlorine for disinfection. You can reach the city utility at 972-924-3325, or find emergency contact information on annatexas.gov.

The water's journey begins in the Upper Trinity River watershed, which is rich with Cretaceous-era rock formations such as the Woodbine Sandstone and Trinity Group limestones. Groundwater is extracted from the Trinity Aquifer, a significant karst system in North Central Texas. This aquifer rests on layers of dolomite and limestone dating back to the Lower Cretaceous period. As groundwater filters through these easily dissolved rock types, it picks up calcium and magnesium ions, resulting in a characteristically hard water supply with a high mineral content. Surface water flowing through the watershed picks up similar minerals from contact with the limestone bedrock and alluvial soils, reinforcing the consistently hard water profile common throughout the region.

Dealing with this very hard water means you'll likely notice scale buildup forming inside pipes, water heaters, dishwashers, and washing machines. This accumulation not only looks unsightly but also reduces the efficiency and lifespan of these appliances. Homeowners often see white deposits on faucets and fixtures, struggle with soap scum, and observe spotting on glassware after washing. To combat these issues and protect your home's plumbing and appliances, installing a water softener is highly recommended. While regular maintenance, such as deliming water heaters and using scale inhibitors, can help, a softener offers the most effective protection against the effects of very hard water. The City of Anna and independent labs monitor water quality, meeting TCEQ standards, with disinfection handled by chloramines and chlorine.