Clogged drain: how to clear it, when to call a plumber and cost
For Silicon Valley homes · Updated October 2026 · Sources below
One slow drain is usually a local clog - hair, soap or grease - that a plunger or hand drain snake can clear. When several drains back up at once, or water comes up in the tub when you flush, the clog is likely in the main line and needs a plumber. Most kitchen clogs start with grease, so keep it out of the sink.
The short version
- One slow drain: usually a local clog you can try to clear
- Several drains slow or backing up: likely a main-line clog - stop using water and call a plumber
- Never pour grease or oil down the sink; scrape it into the trash
- Garbage disposals and dish soap don't stop grease from building up in pipes
- Typical drain clearing: about $147 - $352 (national)
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What it costs
- Clear a clogged drain$147 - $352
Main-line clogs and camera inspections cost more.
Typical ranges from published cost guides - mostly national figures. Bay Area prices usually run higher. Your actual price depends on your home and the job, and a pro gives you the real number. Source: HomeAdvisor cost guide (national) (Jun 2026). Have a quote? Check it with the Quote Explainer
Signs the clog is in the main line
- More than one fixture is slow or backing up
- Water comes up in the tub or shower when you flush or run the washer
- Gurgling from toilets or drains
- Sewage smell in the house or yard
- Water backing up at the lowest drain in the house
Try it yourself or call a plumber?
- Try first: pull and clean the sink or tub stopper, use a plunger (a flange plunger for toilets), or a hand drain snake.
- Call a plumber: the clog comes back, a snake doesn't reach it, or more than one drain is affected.
- If you already poured a chemical drain cleaner in, tell the plumber before they start.
- Recurring clogs: ask for a camera inspection to see whether roots, grease or a broken pipe is the cause.
In Silicon Valley
- The City of Santa Clara warns that fats, oils and grease can build up and cause a sewer overflow inside your home. Scrape grease into the trash, never pour hot oil down the sink, and know that garbage disposals and soap don't remove grease.
- City of Santa Clara: if sewage backs up and you have a property-line cleanout, the City asks you to call it first so it can check the city side.
- San José requires an approved wye cleanout within five feet of the sidewalk for access to the sewer lateral - having one makes main-line clogs easier and cheaper to clear.
Questions homeowners ask
Why is my drain so slow?
Bathroom drains usually slow down from hair and soap buildup near the stopper; kitchen drains from grease and food. If only one drain is slow, the clog is close to that fixture. If several are slow, the problem is likely further down the line.
How do I unclog a drain without a plumber?
Clean the stopper, then try a plunger or a hand drain snake. Avoid pouring grease or hot oil down the drain, and don't count on a garbage disposal or soap to move grease along. If two or three tries don't work, call a plumber.
Why are all my drains backing up at once?
That usually means a clog in the main line or sewer lateral. Stop running water, don't flush, and call a plumber. In Santa Clara, if you have a property-line cleanout, the City asks you to call it first.
How much does a plumber charge to unclog a drain?
National cost guides put clearing a clogged drain at about $147 to $352. Main-line clogs and camera inspections cost more, and Bay Area prices usually run higher.
Are chemical drain cleaners a good idea?
Try a plunger or drain snake first. If a chemical cleaner doesn't clear the clog, the drain is left full of harsh chemicals - so if you already used one, tell the plumber before they open the drain.
How do I keep drains from clogging?
Scrape grease and food scraps into the trash before washing dishes, use strainers in sinks and tubs, and throw lotions and cosmetics in the trash rather than down the drain. If clogs keep coming back, ask for a camera inspection.
Questions to ask the pro
- Is your price flat, or by the hour?
- Will you snake or hydro-jet the line, and why?
- Can you run a camera if the clog comes back?
- Is the clog on my side or in the city's line?
- Is the work warrantied if it clogs again soon?
Before you sign, check the contractor's license at cslb.ca.gov. How to hire a contractor in California
Need a plumber?
Tell us about the job in 2 minutes - free. We send it to one local pro at a time, never a crowd.
Related answers
Sources
- City of Santa Clara - Fats, Oils & Grease (FOG) Program
- City of San José - Sewers & storm drains (wye cleanouts)
General information for Silicon Valley homeowners, not professional advice for your home. Rules and programs change - check the source, and have a licensed pro look at your situation.