Whole-House Plumbing Inspection in Walnut Creek
A whole-house plumbing inspection in Walnut Creek is a top-to-bottom check of the pipes, valves, fixtures, water heater, gas connections and drains in your home, including a crawl under the house, so you know what is aging and what needs attention before it fails. We do preventive checkups for longtime owners and inspections for buyers and sellers, and we will tell you when a sewer camera inspection is worth adding. Call (925) 887-6347. A real person answers 24/7, and estimates are free.
- Open 24 hours, including holidays
- Licensed and insured since 1993
- Written price before any work starts
- Senior discount available
What a home plumbing inspection in Walnut Creek covers
A plumbing inspection is a hands-on look at every part of the plumbing system you can reach, done by a plumber instead of a generalist. We crawl under the house, check the water heater and its strapping, test pressure, run every fixture, look at gas connections and shutoffs, and note anything that is leaking, aging or out of date.
We offer whole-house inspections as a service of their own: crawl-under inspections, preventive checkups, whole-house plumbing checkups, and leak detection and repair. You get a plain report of what we saw, what is fine, what to watch, and what we would fix now. No scare tactics. A lot of what we find is "this is old but working, plan for it in a few years."
Crawl-under inspection
Most problems hide under the floor: weeping joints, galvanized pipe, missing supports, old repairs and damp soil. We go under and look.
Preventive checkup
For owners who have been in the house a long time and want to know what is coming before it becomes an emergency.
Buyer and seller inspections
A plumber's view of a home before you buy or list, focused on the items that cost real money to fix.
Water heater and strapping
Age, condition, venting clearances, relief valve discharge and the earthquake strapping California law requires.
Gas and safety devices
Shutoffs, flexible connectors, sediment traps and seismic gas valves where installed, as part of a whole-house safety check.
Sewer camera, when it makes sense
A general inspection cannot see inside the buried sewer lateral. We tell you when to add an inline video inspection.
Our whole-house plumbing inspection checklist
We check water supply, drains, fixtures, the water heater, gas connections and safety devices, both inside the house and outside. Here is what that typically includes. What we can reach depends on the house, and we tell you if anything was blocked or inaccessible.
Water supply
- Type of supply pipe: copper, PEX, galvanized steel, or a mix
- Static water pressure at a hose bib, and whether a pressure-reducing valve is present and working
- Main shutoff location, type and whether it actually closes
- Fixture shutoffs under sinks and toilets
- Visible corrosion, green crust, rust or damp spots on exposed pipe
- Meter leak test with all water off
- Hose bibs, spigots and backflow devices where present
Drains, waste and vent
- Drain speed at every sink, tub and shower
- Drain material under the house: cast iron, ABS or other
- Signs of past backups, staining or patched sections
- P-traps and visible vent connections
- Sewer cleanout location and whether an overflow protection device is installed
Fixtures and appliances
- Toilets: flush, fill, rocking at the base, leaking flappers
- Faucets and shower valves: drips, temperature control, flow
- Washing machine hoses and laundry box, dishwasher and fridge supply lines
- Garbage disposal and under-sink connections
- Fixtures that may not meet California's water-conserving standards
Water heater and gas
- Water heater age, rust, leaks, relief valve and its discharge line
- Earthquake strapping or bracing
- Gas shutoffs at appliances, flexible connectors and visible gas piping
- Seismic or excess flow gas valves, if installed
Why Walnut Creek homes benefit from a plumbing inspection
Much of Walnut Creek was built in the 1950s and 1960s, and many owners have lived in their homes for decades. That combination means a lot of original plumbing that nobody has looked at closely in years.
The city grew from 9,903 people in 1960 to 39,844 in 1970. Homes from that boom often have galvanized steel supply pipe that corrodes on the inside, cast iron drains, and clay sewer laterals with joints that let roots in. Some have been partly updated, so a house in Parkmead, Walnut Heights or Rancho Paraiso might have new copper in the kitchen and the original galvanized everywhere else.
The Prop 13 angle: long ownership, original plumbing
California's Proposition 13 limits increases in a home's assessed value to at most 2% a year until it sells. That gives longtime owners a strong reason to stay, and many do. The result is a lot of 50- and 60-year-old houses where the plumbing has simply never been replaced. If you plan to stay another 10 or 20 years, an inspection tells you what to budget for, and lets you plan a repipe or sewer repair on your schedule instead of after a flood.
Trees, roots and Central San
Mature trees are part of what makes neighborhoods like Walnut Heights and Castle Hill so pleasant, and they are also the reason so many sewer laterals have trouble. Central San says root intrusion is the leading cause of sewer backups, and recommends inspecting or cleaning the lateral at least every other year if trees are near it.
Earthquake country
California law requires water heaters to be braced, anchored or strapped to resist earthquake motion. Older installations sometimes have strapping that is missing, loose or not enough. An inspection is a good time to fix that, along with flexible connectors and gas shutoffs. Our earthquake safety plumbing page covers the options.
Plumbing inspections for buyers and sellers
For buyers, a plumber's inspection answers the questions a general home inspection often leaves open: what the supply pipe is made of, how old the water heater really is, and whether the sewer lateral needs a camera. For sellers, it helps you find and fix problems before a buyer's inspector does.
Buying a home
We focus on the expensive items: supply pipe material, drain condition, water heater age and strapping, gas connections, and whether a sewer camera inspection is needed. You go into negotiations knowing what you are buying.
Selling a home
We check what buyers will ask about, fix strapping and leaks, and help you avoid last-minute surprises. Small repairs before listing are often easier than repairs in the middle of escrow.
Water heater strapping certification for sellers
California Health and Safety Code section 19211 requires all new, replacement and existing residential water heaters to be braced, anchored or strapped to resist earthquake motion. Sellers must certify in writing to the buyer that the water heater has been braced, anchored or strapped. We can inspect the strapping, bring it up to standard if needed, and give you a written record of the work so you have something solid behind that certification.
Water-conserving fixture disclosure
California Civil Code sections 1101.4 and 1102.155 require sellers of single-family homes to disclose in writing that California requires water-conserving plumbing fixtures, and whether the home has any noncompliant fixtures. The fixture replacement rules in section 1101.4 apply to homes built and available for use on or before January 1, 1994. Under Civil Code section 1101.3, noncompliant means toilets that use more than 1.6 gallons per flush, showerheads over 2.5 gallons per minute, and interior faucets over 2.2 gallons per minute. We can check every fixture and tell you which ones fall into that group, and replace them if you want.
Sewer inspection before buying a home in Walnut Creek
If you are buying an older home, a sewer camera inspection is one of the best investments you can make before closing. A general home inspection cannot see inside the buried pipe that carries waste to the street, and in Walnut Creek, the owner is responsible for all of it.
Central San, the sanitary district for Walnut Creek, says the property owner is responsible for the entire private sewer lateral, from the house to the Central San main, including the part under the sidewalk and the street. If that pipe is cracked, sagging or full of roots, the repair is yours the day you take ownership.
We run inline drain and sewer video inspections. A camera goes through the cleanout and down the lateral, and we record what it sees: roots at clay joints, offset or separated joints, cracks, sags that hold water, grease buildup, and where the line meets the main. We would recommend a sewer scope when:
- The house was built in the 1950s or 1960s, or the lateral may be original clay
- There are large trees in the front yard or near the line
- Drains are slow, gurgle, or the seller mentions past backups
- There is no visible cleanout, or it looks newly installed after a repair
- You simply want to know before you commit
If the camera finds trouble, we can explain the options, from drain cleaning and root removal to spot repair, pipe bursting or trenchless replacement. Central San's Permit Counter can be reached at (925) 229-7371 for questions about lateral work.
How our plumbing inspection works
We schedule a time, inspect the whole system, then walk you through what we found and give you a written summary with any repairs priced. The inspection itself is the same whether you are buying, selling or staying.
- Call and tell us whyBuying, selling or just checking up. Let us know the age of the house and any problems you have noticed so we bring the right equipment.
- Walk the house with youWe run fixtures, check under sinks, look at the water heater and gas connections, and test water pressure.
- Crawl under the houseWe look at supply and drain piping, supports, old repairs and moisture. If there is a slab, we use the meter test and other checks instead.
- Check the outsideHose bibs, the cleanout, irrigation connections, the meter and the line to the house where visible.
- Add the sewer camera if neededIf the age, trees or symptoms point to the lateral, we recommend a video inspection and explain why.
- Plain report and written pricesWe tell you what is fine, what to watch and what to fix, with a free written estimate for any repair you want.
Inspection options compared
A general home inspection, a plumber's whole-house inspection and a sewer camera inspection each answer different questions. For an older home, the plumber's inspection plus a sewer scope covers the most ground.
| Type | Who does it | What it answers | What it misses |
|---|---|---|---|
| General home inspection | Home inspector | Broad view of the whole house, including roof, electrical and structure | Usually limited depth on plumbing; does not see inside the sewer lateral |
| Whole-house plumbing inspection | Licensed plumber | Pipe material, pressure, valves, water heater, strapping, fixtures, gas connections, crawlspace plumbing | Inside of buried lines and pipes sealed in walls |
| Sewer camera inspection | Plumber with inline video equipment | Condition of the sewer lateral: roots, cracks, sags, offsets | Supply piping and fixtures |
| Leak detection | Plumber with electronic equipment | Where a known or suspected leak is | Overall system condition |
If the inspection turns up a suspected hidden leak, our leak detection service is the next step.
Rossmoor, condos and Walnut Creek neighborhoods
In Rossmoor and other attached homes, an inspection usually focuses on what is inside your unit, because shared pipes and building systems may belong to the association. Check your governing documents first so you know what is yours.
Rossmoor was built starting in 1963 and is mostly co-ops and condos, with about 40% in garden-style duplexes to fourplexes. Its 23 Mutuals each have their own board, and Rossmoor tells residents to consult their Mutual's CC&Rs, bylaws, occupancy agreement and policies to see when the Mutual is responsible. For a Rossmoor buyer or longtime resident, a fixture-level check of toilets, faucets, supply lines, the water heater and its strapping is often the most useful inspection.
Single-family homes across Walnut Creek get the full crawl-under treatment: Northgate, Rudgear Estates, Tice Valley, Lakewood, Saranap, Walnut Knolls, Diablo Shadows and the rest. If you are in unincorporated Saranap, permits for any repairs go through Contra Costa County rather than the City of Walnut Creek.
What affects the cost of a plumbing inspection
The cost depends mainly on the size of the home, the number of fixtures, crawlspace access, and whether you add a sewer camera inspection. Call and we will tell you what to expect for your house.
- Square footage and number of bathrooms
- Crawlspace, slab or multi-level construction
- Whether a sewer camera inspection is added
- Any repairs you choose to have done the same visit
Estimates for repairs are free and written. We offer a senior discount, which matters to a lot of longtime Walnut Creek owners, and we accept Mastercard and Visa.
Simple checks you can do between inspections
You can do a lot of preventive checking yourself: find and exercise your main shutoff, run a meter leak test, check under sinks, and watch drain speed. Call a plumber when you see rust, repeat leaks, slow drains in more than one room, or a water heater that is leaking or unstrapped.
- Turn your main shutoff off and on once a year so it does not seize
- With all water off, check that the meter's leak indicator is not moving
- Put food coloring in each toilet tank and watch the bowl for 15 to 30 minutes
- Check washer hoses and sink supply lines for bulges or rust
- Look at the water heater for rust at the base and make sure the straps are tight
- Keep wipes, even "flushable" ones, and cooking grease out of drains
- Wrap or cover exposed outdoor pipes when frost is forecast
Why choose us for your plumbing inspection
We have been a family business serving Contra Costa and Alameda Counties since 1993, from our North Main Street shop in Walnut Creek. Owner Mo Williams is a Bay Area native who learned plumbing and construction products and installation at Simon's Hardware in Walnut Creek and Home Depot in Concord.
We hold a 4.7 Google rating from 251 reviews as of October 2026, and we are BBB Accredited A+ and members of PHCC and the Walnut Creek Chamber of Commerce and Visitors Bureau. If the inspection points to bigger work, we also do whole-house repiping and water heater replacement.
A family business led by Mo Williams since 1993
We are a Walnut Creek family business run from our North Main Street shop. Owner Mo Williams grew up in the Bay Area and learned plumbing products and installation from the inside out at Simon's Hardware in Walnut Creek and Home Depot in Concord. His wife Ann runs the books as CFO. We're rated 4.7 on Google from 251 reviews (October 2026). Meet Mo
Frequently asked questions
What is included in a whole-house plumbing inspection?
A whole-house plumbing inspection checks the water supply pipes, main shutoff, water pressure, drains, fixtures, water heater and its earthquake strapping, gas connections and shutoffs, hose bibs, and the plumbing under the house. We also run a meter leak test. A buried sewer lateral cannot be seen without a camera, so we tell you when a sewer video inspection should be added.
Should I get a sewer inspection before buying a house in Walnut Creek?
For most older homes, yes. Central San says the property owner is responsible for the entire private sewer lateral, from the house to the main, including the part under the sidewalk and street. A general home inspection cannot see inside that pipe. A camera inspection shows roots, cracks, sags and offset joints before you take ownership of any repair.
Is a plumbing inspection different from a regular home inspection?
Yes. A home inspector covers the whole house, including roof, electrical and structure, so plumbing gets limited time. A plumber's inspection goes deeper on pipe material, pressure, valves, the water heater, gas connections and crawlspace piping, and the plumber can price repairs on the spot. Many buyers of older Walnut Creek homes get both, plus a sewer camera inspection.
Do sellers in California have to certify water heater strapping?
Yes. California Health and Safety Code section 19211 requires residential water heaters to be braced, anchored or strapped to resist earthquake motion, and sellers must certify in writing to the buyer that this has been done. We can inspect the strapping, fix it if it falls short, and give you a written record of the work to back up the certification.
What is a crawl-under inspection?
A crawl-under inspection means a plumber physically goes into the crawlspace beneath your house to look at the supply and drain piping. That is where we find weeping joints, galvanized pipe, missing pipe supports, old patch repairs and damp soil from slow leaks. Many problems in Walnut Creek's mid-century homes are only visible from underneath the floor.
How often should I have my plumbing inspected?
There is no single rule, but older homes benefit from regular checkups, especially if the plumbing is original. Central San recommends inspecting or cleaning the sewer lateral at least every other year if trees are near it. A preventive checkup is also smart before a remodel, after a major leak, and when you have owned the house a long time without one.
Why does long ownership matter for plumbing?
Proposition 13 keeps assessed value increases to at most 2% a year until a home sells, so many Walnut Creek owners stay for decades. That often means the plumbing is original to a 1950s or 1960s house: galvanized supply pipe, cast iron drains and clay laterals. An inspection tells you what to budget for so you can plan repairs instead of reacting to a failure.
Do I have to disclose old toilets and showerheads when selling?
Yes. California Civil Code sections 1101.4 and 1102.155 require sellers of single-family homes to disclose in writing the water-conserving fixture requirement and whether the home has noncompliant fixtures. The rules target homes built on or before January 1, 1994. Noncompliant includes toilets over 1.6 gallons per flush and showerheads over 2.5 gallons per minute. We can identify them and replace them before listing.
Can you inspect a Rossmoor condo or co-op?
Yes. In Rossmoor and other attached homes we usually focus on what is inside your unit: toilets, faucets, supply lines, shutoffs, the water heater and its strapping. Shared pipes may belong to your Mutual, and Rossmoor advises residents to check their Mutual's CC&Rs, bylaws, occupancy agreement and policies to see who is responsible before any repair work.
What happens if the inspection finds a problem?
We explain what we found in plain language, separate urgent items from things to watch, and give you a free written estimate for any repair you want. Nothing is done without your OK. If the problem is a hidden leak, a failing lateral or worn-out pipe, we can handle leak detection, sewer repair or repiping, and we offer a senior discount.
Other ways we help Walnut Creek homes
Call a Walnut Creek plumber for plumbing inspections
A real person answers 24 hours a day, 7 days a week. Tell us what's happening and we'll give you an honest arrival window and a free written estimate before any work starts.
Call now, day or night
(925) 887-6347- Licensed plumber, not a salesperson
- Free written estimate before work begins
- Senior discount, ask when you call
- Mastercard and Visa accepted
- Non-urgent questions: balzaparis@gmail.com
Water or sewage spreading? Shut off the fixture or main valve, then call. Smell gas? Leave first and call PG&E at 1-800-743-5000 or 911 from outside.
2108 N. Main Street, Suite F
Walnut Creek, CA 94596
Phone: (925) 887-6347
Email: balzaparis@gmail.com
Open 24 hours, 7 days a week