Round Rock, Texas Water Outage Today

Round Rock water system at a glance

Federal records name City of Round Rock as the public water system for Round Rock, with about 130,662 people on its mains. Customers know it as City of Round Rock Utilities; the name on your bill is the one to call.

What feeds the taps in Round Rock

Round Rock drinks surface water. City of Round Rock draws it from 1 - Lake Georgetown and treats it before it goes into the distribution system. Treatment points named in EPA's facility list include Plant - Lake Creek / 501 N Mays St. After treatment the water is held in 18 storage tanks and reservoirs and pushed uphill by 38 pump facilities; that storage is the buffer that keeps taps running for a few hours after a pump or main fails.

The outage angle. A surface-water system depends on its plant staying online. If the plant, the raw-water pumps or the power feeding them fails, pressure can fall across the entire service area at once, and a precautionary boil notice tends to cover whole zones rather than the single street of a main break. EPA lists 2 emergency connections to neighboring systems, which can be opened to move water across a boundary during a failure.

What causes water outages and low pressure in Round Rock

Which failures hit Round Rock hardest follows from its weather, its housing stock and how it is supplied.

• Summer demand. Round Rock has about 84 days a year at or above 95°F and 42 at or above 100°F, and the hottest day in the record came on July 23, 2018. Lawn irrigation and cooling push demand to its yearly high, so pumps run hard, tanks drain faster than they refill and pressure sags on high ground in the evening.
• Freezing weather. Round Rock sees about 15 days a year with a low at or below 32°F, and 1 day at or below 20°F. The coldest morning in the 2015 through 2025 record came on February 16, 2021. The longest stretch with highs that never rose above freezing ran 4 days, ending February 16, 2021. Frost pushes into shallow service lines first. Mains follow when the ground heaves and thaws, which is why break counts climb a day or two after the temperature swings.
• Flooding and heavy rain. NOAA logged 66 flood, flash flood and heavy rain reports in Williamson County from 2015 through 2026, and 6 days a year bring an inch of rain or more. High water can wash out the ground under buried pipe, flood pump stations and push treatment plants past their limits, which is why boil notices so often follow a flood.
• Storm-driven power loss. Thunderstorm wind, hail and tornado reports in Williamson County number 296 since 2015. Pump stations and treatment plants that depend on Oncor run on the electric grid, so a storm that downs power lines can lower water pressure even when no pipe is damaged.
• Long dry spells. The longest stretch without measurable rain since 2015 lasted 40 days, ending August 11, 2015. Dry soil shrinks and shifts around buried pipe, and breaks often cluster when the rain returns and the ground swells again.
• Younger pipe, different risks. Only 2.9% of occupied homes in Round Rock predate 1970 (US 35.5%), so more of the network is newer plastic or ductile iron. Breaks tend to come from construction damage, pressure surges and weather rather than age.

Freeze, heat and rain: the Round Rock weather record

Main break season in Round Rock runs from late fall into early spring, with the coldest stretch around December through February.

Because this is gridded reanalysis data, individual hot and cold days can read a few degrees off what the airport recorded. The day counts and yearly patterns are the useful part.

Boil water advisories and the federal violation record for Round Rock

Since 2015, EPA's record for City of Round Rock shows no health-based violations.

When Round Rock loses pressure after a break or a failed test, City of Round Rock Utilities asks affected customers to boil water for drinking and cooking. The notice ends only after samples come back clean, which usually takes one to two days after service returns, and the Texas Commission on Environmental Quality (TCEQ) supervises the process.

What the lead tests and housing age say about Round Rock

The most recent 90th-percentile lead result filed for City of Round Rock is 5 ppb (2023). The federal action level is 15 ppb, so that result is far from the limit.

2.9% of occupied homes in Round Rock were built before 1970, and lead service lines and solder stayed legal until the federal ban in 1986. After any outage that disturbs the pipes, run the cold tap 30 seconds to 2 minutes before drinking, and ask City of Round Rock Utilities about its lead service line inventory.

How long a water outage lasts in Round Rock

A crew that arrives at an ordinary main break in Round Rock usually needs 4 to 8 hours to isolate the pipe, dig, repair, flush and restore pressure. Large transmission mains, deep pipes and breaks under busy streets can take a day or more.

Ask City of Round Rock Utilities for a restoration estimate when you report the outage; for large breaks it is normally posted and updated as the repair progresses.

How much water to keep on hand in Round Rock

With about 2.6 people in the typical Round Rock home, FEMA's one-gallon-per-person-per-day rule means 8 gallons covers three days and 37 gallons covers two weeks.

• Heat: 84 days a year top 95°F here, so plan for more than the one-gallon minimum, and keep extra for pets.
• Your water heater tank holds 30 to 50 gallons of clean water. Turn off the power or gas to it first, then drain from the valve at the bottom.
• Fill the bathtub and a few large pots as soon as you hear a break is likely; that water is for flushing and washing, not drinking.

How Round Rock compares with nearby water systems

Water outage pages for nearby cities

Austin, TX · San Antonio, TX · Houston, TX · Fort Worth, TX