Texas Local Government Code - LOC GOV'T § 551.002. Protection of Streams and Watersheds by Home-Rule Municipality

(a) A home-rule municipality may prohibit the pollution or degradation of and may police a stream, drain, recharge feature, recharge area, or tributary that may constitute or recharge the source of water supply of any municipality.

(b) A home-rule municipality may provide for the protection of and may police any watersheds.

(c) The authority granted by this section may be exercised inside the municipality's boundaries or inside the municipality's extraterritorial jurisdiction or outside the municipality's extraterritorial jurisdiction only if required to meet other state or federal requirements. The authority granted by this section for the protection of recharge, recharge areas, or recharge features of groundwater aquifers may be exercised outside the municipality's boundaries and within the extraterritorial jurisdiction provided the municipality exercising such authority has a population greater than 750,000 and the groundwater constitutes more than 75 percent of the municipality's source of water supply.