Drinking Water

The Canyon Regional Water Authority is located on Lake Dunlap near the dam. CRWA provides domestic drinking water to the following areas and water companies:

Green Valley (rural areas S.W. of New Braunfels, including Marion and Cibolo)
Spring Hill (all surrounding areas of Seguin)
Crystal Clear (all rural areas between Seguin and San Marcos)
East Central
La Vernia
Cibolo
Martin Dale
Maxwell (rural areas S.E. of San Marcos)
San Marcos
County Line

Algae affects the taste and odor of drinking water. Algae can cause allergies and diarrhea in extreme circumstances. During the summer months Lake Dunlap will reach eutrophic and hypereutrophic levels of algae. Algae reaches hypereutrophic levels (20-48 mg/L) near the dam where our drinking water is pumped out by the Canyon Regional Water Authority. Algae becomes a health hazard when it reaches hypereutrophic levels and affects our drinking water.