Texas tops the national count of boil water notices most years, and it is not because Texas water is dirtier — it is arithmetic and regulation working as intended.
The 24-hour rule
Under state rules enforced by the Texas Commission on Environmental Quality (TCEQ), a public water system must issue a boil water notice within 24 hours when pressure drops below 20 psi, when the system loses power or pressure during an outage, or when contamination is suspected. Texas has thousands of public water systems — far more than most states — so even a small percentage having a bad day produces a large absolute number of notices.
Weather does the rest
Hurricanes along the Gulf Coast, winter storms that knock out power (the February 2021 Uri event triggered notices for millions of customers at once), floods and drought-driven line breaks all pressurize the rule. Rural systems with long pipe runs are especially vulnerable to pressure loss, which is the most common trigger nationwide.
What to do with a Texas notice
The instructions are the standard ones: boil for one minute before drinking, cooking and ice; avoid swallowing shower water; flush and reset appliances when TCEQ approves rescission after two rounds of clean samples. Our Texas page collects current notices and links to TCEQ’s official resources so you can verify directly at the source.