Quick answer
For water damage in Castell, TX, shut off your main valve first, or turn off the well pump breaker if you are on a private well. For septic permits after a backup, call Llano County Development Services at 325-247-2039. Then call a water damage restoration company; drying should start within 24 to 48 hours. Texas insurers must acknowledge your claim within 15 days.
Do this first
Local water and septic lines.
- Shut off the water. Close your main valve, or turn off the well pump breaker if your home runs on a private well. Castell is unincorporated, so there is no town water office to call; a leak on your side of the meter or well is yours to stop.
- Make it safe and document it. Cut power to wet rooms from a dry spot, photograph the damage, then report the claim.
- Start drying within 24 to 48 hours. Stone and older frame ranch houses near the river can hold moisture in walls and under floors, so ask for readings in every wet room before anything is closed up.
The Llano River can rise many feet in a few hours after Hill Country storms, and low crossings near Castell go under first. Never drive through water over a road. Floodwater can carry septic runoff, so treat it as contaminated.
What to know about water damage in Castell
1847
The year German immigrants of the Adelsverein, led from Fredericksburg by Count Emil von Kriewitz, founded Castell on the north side of the Llano River. It was named for Count Carl Frederick Castell-Castell, the society's business manager.
Source: Handbook of Texas, Castell
The one that survived
Leiningen, Bettina, and Schoenburg were founded by the same society at the same time, but did not last. In 1872 a post office opened on the south bank, where Castell has been centered since.
Source: Handbook of Texas, Castell
Church since 1852
Rev. Charles A. Grote held the first church services in the region here in 1852, and the local Methodist and Lutheran churches date their founding to that year. Castell had 72 residents in 1972 and again in 2000.
Source: Handbook of Texas, Castell
River flood stages
The National Weather Service gauge downstream at Llano lists 26 feet as the stage where major flooding threatens the lowest homes from near Castell to below Llano. At 30 feet, flooding reaches the lowest homes below Castell.
Source: NOAA National Water Prediction Service, Llano River at Llano
Two crests over 40 feet
The Llano gauge's highest recorded crest is 41.5 feet on June 14, 1935. The second highest is 40.14 feet on October 16, 2018, and the river reached 27.07 feet on July 4, 2025.
Septic and floodplain permits
Llano County Development Services, at 100 W. Sandstone Street in Llano, handles septic permits and floodplain development. The county asks for 7 to 10 business days on most reviews and more time for septic and floodplain work.
Freezes and rain
The NOAA weather station at Mason, about 16.2 miles away, averages 51.1 nights a year at or below 32°F and 5.4 at or below 20°F. In half of years the first freeze comes by November 13 and the last one after March 18. Pipes in outside walls, attics, and pier-and-beam crawlspaces are the first to split. It also averages 28.9 inches of rain a year, with about 7.9 days of an inch or more.
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Flash flood warnings in Llano County
The National Weather Service issued 35 flash flood warnings that included Llano County from 2016 through November 12, 2026. The year-by-year count is on the Sunrise Beach Village page.
Cost and insurance in Castell
How much does water damage restoration cost in Castell?
Most jobs run $450 to $16,000 (Angi). Llano River flooding needs a separate flood policy. Stone walls and wet subfloors take longer.
Water removal and restoration in Castell
The company that answers handles burst pipes in hard freezes, well and pressure tank leaks, septic backups, and river or creek water after storms, plus burst pipes, appliance leaks, drying, and septic backups.
Castell questions
Who handles septic permits in Castell?
Llano County Development Services, 325-247-2039, in Llano. Septic repairs need a county permit; a restoration company handles the cleanup inside the house.
How cold does Castell get?
The NOAA station at Mason, about 16 miles away, averages 51 nights a year at or below 32°F and about 5 at or below 20°F. In half of years the first freeze comes by November 13.
Can the Llano River reach homes in Castell?
In a major flood, yes. The NWS gauge at Llano lists 26 feet as the stage where the lowest homes near Castell are threatened, and the river has crested above 40 feet twice.
Which ZIP codes does this page cover?
ZIP 76831, the Castell post office area in western Llano County.
Related guides
Other Texas towns- Sewage backup: what to do first
- Water mitigation vs. restoration
- Burst pipe repair cost
- Texas insurance claim deadlines, in plain English
- Frozen and burst pipes: what to do
- Does homeowners insurance cover water damage?
- How long water damage takes to dry
Local phone numbers checked November 2026: