McKinney water meets all standards, earns Texas top rating
McKinney’s 2025 water tests found no contaminant violations, and TCEQ gave the city a superior rating that signals a clean bill of health for household taps.
McKinney’s drinking water met every state and federal health standard in 2025, and the city recorded no contaminant violations anywhere in the system in its 2026 Water Quality Report released June 30. The report also put the city in Texas’s top tier with a “superior” rating from the Texas Commission on Environmental Quality.
Lead, copper and disinfection-by-products stayed well below regulatory limits.
The Texas Commission on Environmental Quality’s public drinking-water recognition program honors systems for outstanding performance during the preceding calendar year, and its highest award adds stricter tests for capacity, year-round conservation, source-water protection and a clean enforcement record with no primary drinking-water violations or unresolved actions in the last three years. McKinney’s superior rating places its system inside that framework, even though the city did not say it received the separate top award.
McKinney buys treated water from the North Texas Municipal Water District, which draws from a regional supply network that includes Lavon Lake, Bois d’Arc Lake, Lake Texoma, Jim Chapman Lake, Lake Tawakoni and the East Fork Water Reuse Project. The district owns and operates seven water treatment plants, including facilities in Wylie and Leonard, and serves about 1.7 million people across 10 counties. Its service area is expected to more than double by 2070.
McKinney’s water meets Environmental Protection Agency and TCEQ lead standards, remains well below action levels and has extremely low lead levels. City crews completed an inventory of more than 66,000 service lines, began that work in 2021 and have replaced all known lead service lines found during maintenance and rehabilitation projects.
McKinney also started a 10-year water service line replacement project in April 2017 to replace nearly 14,500 copper service lines, about 54% of the city’s 27,000 service connections. Aggressive local soil and deteriorating copper material have contributed to an average monthly water loss of 23%.
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