California · 19 covered places · 32 ZIP codes
Plumbers in Marin County, CA
We cover 19 cities and towns in Marin County, California, across 32 ZIP codes, including San Rafael, Novato, Mill Valley. About 254,000 people live in those ZIP codes. 38% of the homes were built before 1960, so galvanized pipe and old cast iron drains are common.
| Year built | Share of homes |
|---|---|
| Before 1940 | 12% |
| 1940–1959 | 26% |
| 1960–1979 | 39% |
| 1980–1999 | 16% |
| 2000 or later | 7% |
Share of housing units in the covered ZIP codes. Census ACS 2023 5-year estimates.
| Place | Residents in covered ZIPs | Built before 1960 |
|---|---|---|
| San Rafael | 72,230 | 37% |
| Novato | 59,997 | 21% |
| Mill Valley | 32,349 | 48% |
| San Anselmo | 15,891 | 64% |
| Greenbrae | 13,043 | 42% |
| Belvedere Tiburon | 12,682 | 31% |
| Sausalito | 12,160 | 35% |
| Corte Madera | 10,101 | 49% |
| Fairfax | 8,564 | 61% |
| Larkspur | 7,372 | 29% |
What goes wrong in Marin County homes
1960s and 70s homes reaching end of life
39% 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.
Pre-1960 homes: galvanized pipe and cast iron
38% of homes in Marin County's covered ZIP codes were built before 1960, 12% of them before 1940. Houses that old often still have galvanized steel supply lines that rust closed from the inside, and cast iron or clay sewer pipe that cracks and lets roots in. Weak pressure at upstairs fixtures, brown water after a shutoff and slow drains are the usual clues. Typical fixes are whole-house repiping and a sewer camera inspection.
Natural gas in most homes
68% 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.
Common plumbing work in Marin County
Other covered towns in Marin County
- Belvedere Tiburon (1 ZIP)
- Bolinas (1 ZIP)
- Corte Madera (2 ZIPs)
- Dillon Beach (1 ZIP)
- Fairfax (1 ZIP)
- Greenbrae (1 ZIP)
- Inverness (1 ZIP)
- Lagunitas (1 ZIP)
- Larkspur (2 ZIPs)
- Mill Valley (2 ZIPs)
- Novato (4 ZIPs)
- Point Reyes Station (1 ZIP)
- Ross (1 ZIP)
- San Anselmo (2 ZIPs)
- San Geronimo (1 ZIP)
- San Quentin (2 ZIPs)
- San Rafael (5 ZIPs)
- Sausalito (2 ZIPs)
- Tomales (1 ZIP)
Marin County plumbing FAQ
Which towns in Marin County do you cover?
19 places: Belvedere Tiburon, Bolinas, Corte Madera, Dillon Beach, Fairfax, Greenbrae, Inverness, Lagunitas, Larkspur, Mill Valley, Novato, Point Reyes Station, Ross, San Anselmo, San Geronimo, San Quentin, San Rafael, Sausalito, Tomales. Enter your ZIP code to confirm coverage for your street.
How old are homes in Marin County?
Across the covered ZIP codes, Census estimates put 38% of homes as built before 1960, 39% from 1960 to 1979, 16% from 1980 to 1999 and 7% in 2000 or later.
Who licenses plumbers in Marin 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 Marin County, combined across places and weighted by housing units. Some ZIP codes extend into neighboring counties.
Need a plumber in Marin County?
Same-day service when a plumber is available. One call connects you with a licensed plumber who serves your ZIP.