California · 29 covered places · 50 ZIP codes
Plumbers in Contra Costa County, CA
We cover 29 cities and towns in Contra Costa County, California, across 50 ZIP codes, including Concord, Antioch, Pittsburg. About 1,133,000 people live in those ZIP codes. Most homes date from 1960 to 1979, old enough that original water heaters, valves and drains are wearing out.
| Year built | Share of homes |
|---|---|
| Before 1940 | 4% |
| 1940–1959 | 19% |
| 1960–1979 | 30% |
| 1980–1999 | 29% |
| 2000 or later | 18% |
Share of housing units in the covered ZIP codes. Census ACS 2023 5-year estimates.
| Place | Residents in covered ZIPs | Built before 1960 |
|---|---|---|
| Concord | 125,546 | 27% |
| Antioch | 115,759 | 15% |
| Pittsburg | 99,933 | 17% |
| Richmond | 93,599 | 54% |
| Walnut Creek | 91,171 | 19% |
| San Ramon | 86,600 | 2% |
| Brentwood | 68,160 | 6% |
| San Pablo | 61,749 | 31% |
| Danville | 60,346 | 8% |
| Martinez | 48,600 | 27% |
What goes wrong in Contra Costa County homes
Natural gas in most homes
67% of occupied homes here heat with utility gas, so gas water heaters, ranges and dryers are common. That means gas line extensions for new appliances, flexible connector replacements and venting checks when a water heater is swapped. If you smell gas, leave first and call the gas utility from outside. See gas line repair.
1960s and 70s homes reaching end of life
30% of the housing here dates from 1960 to 1979. Original copper supply lines in those homes are now 45 to 65 years old, and cast iron drains of that age scale up inside and crack. Seized shutoff valves, pinhole leaks and recurring main-line clogs are common calls. A camera inspection shows the condition of the sewer line before anyone digs.
1980s and 90s construction and polybutylene
29% of homes were built between 1980 and 1999. Polybutylene supply pipe was installed widely in US homes from about 1978 to 1995, so houses from these years are worth checking for gray plastic pipe stamped PB2110, usually visible at the water heater or under sinks. Insurers and buyers often ask about it. See polybutylene replacement.
Common plumbing work in Contra Costa County
City pages in Contra Costa County
Other covered towns in Contra Costa County
- Alamo (1 ZIP)
- Antioch (2 ZIPs)
- Bethel Island (1 ZIP)
- Brentwood (1 ZIP)
- Byron (1 ZIP)
- Clayton (1 ZIP)
- Crockett (1 ZIP)
- Danville (2 ZIPs)
- Diablo (1 ZIP)
- Discovery Bay (1 ZIP)
- El Cerrito (1 ZIP)
- Hercules (1 ZIP)
- Knightsen (1 ZIP)
- Lafayette (1 ZIP)
- Martinez (1 ZIP)
- Moraga (3 ZIPs)
- Oakley (1 ZIP)
- Orinda (1 ZIP)
- Pinole (1 ZIP)
- Pittsburg (1 ZIP)
- Pleasant Hill (1 ZIP)
- Port Costa (1 ZIP)
- Richmond (7 ZIPs)
- Rodeo (1 ZIP)
- San Miguel (1 ZIP)
- San Pablo (1 ZIP)
- San Ramon (2 ZIPs)
- Walnut Creek (4 ZIPs)
Contra Costa County plumbing FAQ
Which towns in Contra Costa County do you cover?
29 places: Alamo, Antioch, Bethel Island, Brentwood, Byron, Clayton, Concord, Crockett, Danville, Diablo, Discovery Bay, El Cerrito, Hercules, Knightsen, Lafayette, Martinez, Moraga, Oakley, Orinda, Pinole, Pittsburg, Pleasant Hill, Port Costa, Richmond, Rodeo, San Miguel, San Pablo, San Ramon, Walnut Creek. Enter your ZIP code to confirm coverage for your street.
How old are homes in Contra Costa County?
Across the covered ZIP codes, Census estimates put 23% of homes as built before 1960, 30% from 1960 to 1979, 29% from 1980 to 1999 and 18% in 2000 or later.
Who licenses plumbers in Contra Costa County, CA?
The Contractors State License Board (CSLB) licenses plumbing contractors under the C-36 classification, and its online lookup shows license status.
Housing and heating figures are US Census Bureau ACS 2023 5-year estimates for the ZIP code areas we cover in Contra Costa County, combined across places and weighted by housing units. Some ZIP codes extend into neighboring counties.
Need a plumber in Contra Costa County?
Same-day service when a plumber is available. One call connects you with a licensed plumber who serves your ZIP.