Walnut CreekSewer Line
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Areas · I-680 and SR-24 corridor

Sewer Line Service Areas

We take sewer line requests from Walnut Creek and the surrounding Central San communities along I-680 and Highway 24. Pages for Lafayette and Danville cover what is different about lateral work there.

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Elevated view of leafy suburban neighborhoods with Mount Diablo rising in the distance
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Map

Schematic map of the service area along Interstate 680 and Highway 24: Orinda, Lafayette, Moraga, Walnut Creek, Pleasant Hill, Concord, Clayton, Alamo, Danville, Diablo and Blackhawk SR-24I-680 Mt. Diablo Walnut CreekLafayetteOrindaMoragaPleasant HillConcordClaytonAlamoDanvilleBlackhawkDiablo
Schematic, not to scale. Filled markers have their own pages.
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Communities

Table 1 · Area notes
#CommunityNotes for lateral work
A-01Walnut CreekMedian home built in the early 1970s; mature street trees. Central San territory.
A-02LafayetteMedian home built in 1960; hillside lots with long or steep laterals.
A-03DanvilleMostly 1970s–80s subdivisions; Town permit center for building work.
A-04AlamoUnincorporated; County handles building and road permits. Covered on the Danville page.
A-05Blackhawk and DiabloUnincorporated; Blackhawk HOA approval for exterior and landscape changes.
A-06OrindaSteep, wooded lots similar to Lafayette; Central San territory.
A-07MoragaOlder Lamorinda housing; County building inspection.
A-08Pleasant HillEarly-1970s homes, flatter lots; Central San territory.
A-09Concord and ClaytonConfirm with your city who maintains and permits your sewer before relying on our Central San guide.
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Same rules across Central San territory

Wherever Central San is your sewer agency, the basics are the same: you own the lateral to the main, outside work needs a Central San permit, and an overflow protection device is required (Central San). Details in the Central San guide; prices in the cost guide.

Sources

  1. Central San: Permit FAQs
  2. U.S. Census Bureau, ACS 5-year estimates: median year structure built (table B25035)
  3. Blackhawk HOA: Architectural review application

Rules and programs change. Confirm current requirements with the agency before you start work.

Next step

Talk to a local sewer contractor

Call to describe what is happening, or send the form. A contractor who works on laterals in Central San territory will follow up to look at the line and give you a written quote.

Call (925) 678-6981

Backup happening now? Stop running water in the house first, then call.

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