Leaks, pipes & freezing · St. Louis
Frozen pipe thawing in St. Louis, MO
If a faucet gives no water or only a trickle after a hard freeze, a pipe is frozen. Leave that faucet open, warm the area gently, and call a plumber if you can't find the frozen section or if it's inside a wall, because a split pipe will leak as soon as it thaws.
- Licensed local plumbers
- The problem explained before work starts
- Price agreed before the job begins
Frozen pipe thawing for St. Louis homes
Cold snaps can arrive fast. An arctic front can drop temperatures 30 to 40 degrees in an afternoon, and pipes in exterior walls, garages, crawl spaces and over unheated soffits freeze first. Homes with pipes run along north-facing walls, or kitchens over a garage, see the same freeze every winter.
For the full guide, including what you can safely do before a plumber arrives, see frozen pipe thawing explained.
Frozen pipe thawing in St. Louis at a glance
- Urgency
- Can be an emergency: shut off the water and call
- Area
- St. Louis, MO
- Who does the work
- An independent, licensed local plumber
- Permit
- Plumbing permits inside the city are issued by the City of St. Louis Building Division
- Typical steps
- Locate the freeze → Thaw safely → Check for splits → Prevent the next one
- Availability
- Call now to check plumber availability
Signs you need frozen pipe thawing in St. Louis
- No water, or a trickle, from one faucet or one side of the house
- Frost on an exposed pipe in a garage or crawl space
- A toilet that won't refill
- Banging or groaning when a faucet is opened
- A sewer-like smell from a drain (ice can block the vent or drain too)
Local conditions
Frozen pipe thawing in St. Louis: what's different
Cold snaps freeze pipes in brick exterior walls of older St. Louis homes, where plumbing was often added long after construction. Pipes in rear additions and unheated spaces are most exposed.
A plumber thaws frozen sections safely and checks for splits. Karst geology in parts of the region can also affect buried lines.
Older brick homes and flats in Soulard and Tower Grove often have pipes in uninsulated exterior walls and rear additions. Insulating those runs and sealing drafts at the foundation prevents most repeat freezes, and vacant units need heat or proper winterizing.
- Water and sewer in St. Louis
- The City of St. Louis Water Division supplies water; the Metropolitan St. Louis Sewer District (MSD) handles sewers.
- Permits in St. Louis
- Plumbing permits inside the city are issued by the City of St. Louis Building Division; St. Louis County has its own office.
St. Louis housing and plumbing
Brick homes and flats from the late 1800s and early 1900s in Soulard, Tower Grove and Lafayette Square typically have basements and old drains.
Neighborhoods and ZIP codes
Plumbers on Thawline cover St. Louis and City of St. Louis, including Soulard, Tower Grove, The Hill, Central West End, Lafayette Square, Dogtown. ZIP codes: 63101 · 63102 · 63103 · 63104 · 63105 · 63106.
Other St. Louis conditions that affect plumbing
- Old laterals: Century-old clay laterals crack and collect roots.
- Basement drains: Heavy rain backs up basement floor drains.
- Frozen pipes: Cold snaps freeze pipes in brick exterior walls.
- City vs. county: The City of St. Louis is separate from St. Louis County, so permit offices and some utilities differ depending on your address.
How frozen pipe thawing works in St. Louis
- 1
Locate the freeze
The plumber traces the line from the dead fixture back toward the main, checking exterior walls, garage ceilings and crawl spaces.
- 2
Thaw safely
Controlled heat such as a heat gun, heat tape or an electric pipe thawing machine is used. Never an open flame.
- 3
Check for splits
As water starts to move, the section is watched for leaks before the faucet is closed and full pressure builds.
- 4
Prevent the next one
Options include insulation, heat cable, sealing air leaks around the rim joist, or moving the pipe into a heated space.
What affects frozen pipe thawing cost in St. Louis
Every job is priced by the plumber after they see it. These are the things that move the price most. Ask for the price before work starts.
- How easy the frozen section is to reach
- Whether the line split while frozen
- Number of frozen runs
- Adding heat cable or rerouting a pipe
Frozen pipe thawing questions in St. Louis
Do pipes freeze in St. Louis brick homes?
Should I drip my faucets in a cold snap?
How long does it take a pipe to freeze?
Can a frozen pipe thaw on its own without damage?
Also in St. Louis
Related
Related plumbing services
Burst pipe repair
Turn off the main water shutoff first, then open a faucet on the lowest floor to drain the lines.
Learn more
Frost-free hose bib repair
A frost-free hose bib keeps its valve inside the heated house, but it still splits if a hose is left attached in freezing weather, because water can't drain out.
Learn more
Leak detection
Turn off every fixture and watch the water meter's leak indicator.
Learn more
Repiping
Repiping replaces a home's water supply lines, usually because old galvanized steel has corroded or polybutylene is at risk of failing.
Learn moreGuides
Read before you call
Emergencies
What to do when a pipe bursts
Shut off the main water valve, open the lowest faucet in the house to drain the lines, turn off the water heater, and cut power to any room where water is reaching outlets. Then call a plumber, photograph the damage, and call your insurer.
Winter & freezing
How to prevent frozen pipes in a Colorado winter
Before the first hard freeze, disconnect hoses, blow out the sprinkler system and seal air leaks near pipes. During a cold snap, keep the heat at 55 °F or higher, open cabinet doors on exterior walls, and let faucets on outside walls drip.
Winter & freezing
How to winterize outdoor faucets and sprinklers
Disconnect every hose, check that hose bibs are frost-free or shut off and drained from inside, have the sprinkler system blown out with compressed air, and drain or insulate the backflow preventer. Do it before the first hard freeze, often in October on the Front Range.
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