The Woodlands Water Hardness & Quality Report (2026)

The Woodlands water supply is managed jointly by Woodlands Mutual Water Company and Woodlands Water, serving Montgomery County, Texas. Sources include groundwater from deep wells tapping the Gulf Coast Aquifer (Evangeline and Jasper formations up to 1,700 feet deep) and surface water from Lake Conroe. The utility operates under a countywide Groundwater Reduction Plan promoting surface water diversification. Annual Consumer Confidence Reports are published by both utilities; total dissolved solids (TDS) fluctuate monthly, with readings of 490–900 mg/L recorded in 2025 per utility data.

The Lake Conroe watershed and San Jacinto River basin supply surface water, while groundwater originates from the Gulf Coast Aquifer's Evangeline and Jasper formations — ancient Tertiary sedimentary layers rich in limestone and gypsum. These minerals dissolve calcium and magnesium ions into the groundwater, yielding a moderately mineralised supply with higher dissolved solids than typical surface sources. Chlorine disinfection reacting with natural organic matter present in this groundwater produces disinfection byproducts, contributing to the supply's chemical character while still meeting regulatory standards.

Moderately hard water in The Woodlands promotes moderate scale buildup in water heaters, dishwashers, and coffee makers, reducing efficiency over time; laundry may feel stiffer and soap lathering is less effective. Periodic descaling with vinegar solutions and regular fixture cleaning is advised. Residential water softeners or reverse osmosis systems are recommended for households sensitive to scale or preferring softer water. Recent tests reveal 7 chemical contaminants, including disinfection byproducts such as bromodichloromethane and arsenic exceeding independent health guidelines, though water meets state regulatory requirements.