Ask most Alamo homeowners who handles their water and they'll say EBMUD without hesitating. It's the name on the bill. So when a friend in Oakland mentions the sewer lateral certificate they had to get before closing, or a listing agent from Berkeley talks about EBMUD's point of sale inspection, it's natural for an Alamo seller to assume the same rule is waiting for them. It isn't. The utility that bills you for water in Alamo is not the agency that owns your sewer line, and that gap is exactly where sellers lose time they didn't budget for.
The bill you pay isn't the agency that matters at closing
EBMUD delivers drinking water across a wide swath of the East Bay, Alamo included. But its wastewater treatment footprint is much smaller. EBMUD treats sewage for nine communities: Alameda, Albany, Berkeley, El Cerrito, Emeryville, Oakland, Piedmont, Kensington, and part of Richmond. Alamo isn't on that list. Homes here send wastewater to Central Contra Costa Sanitary District, known locally as Central San, a completely separate agency with its own rules, its own fee schedule, and no point of sale lateral certification requirement at all.
That last part matters more than it sounds like it should. EBMUD's Private Sewer Lateral program is well known precisely because it catches so many sellers in its actual service area off guard, usually right when they're trying to close a sale. It requires a camera inspection of the pipe running from the house to the street, and if that pipe shows cracks, root intrusion, or sagging sections, the seller or buyer has to deal with it before the deal can finish. Alamo sellers who have heard about this program from friends, past transactions, or general Bay Area real estate chatter sometimes spend weeks bracing for a requirement that was never going to apply to their address in the first place.
Why the confusion is so easy to have
It isn't a small oversight. Alamo, along with Danville, Lafayette, Moraga, Orinda, and Walnut Creek, sits in a genuinely unusual position: EBMUD supplies the water, but Central San owns the sewer. Two different bills, two different sets of rules, one utility name people default to because it's the one they recognize. Nobody sends you a friendly reminder that your sewer agency isn't your water agency. You find out when you start asking questions before a sale, or you don't find out and waste time chasing paperwork that was never required.
Two very different starting points
Before any of this matters, an Alamo seller needs to know which camp their property is actually in. Not every home here is on Central San sewer. Alamo has a meaningful number of larger, more rural lots still running on septic systems, particularly in the hillside and canyon parcels that give the town its semi-rural character. The path to closing looks completely different depending on which one you have.
| Central San Sewer | Septic System | |
|---|---|---|
| Governing agency | Central Contra Costa Sanitary District | Contra Costa County Environmental Health, Land Use Program |
| Point of sale inspection required by agency rule | No | Effectively yes, in practice, before most transactions close |
| Who performs it | Not applicable | Licensed contractor or Registered Environmental Health Specialist |
| Typical cost | N/A unless connecting for the first time | Roughly $300 to $900 depending on scope |
| Disclosure requirement | Standard TDS and SPQ, as with any California sale | TDS and SPQ specifically call out septic system condition |
If you're not sure which column describes your property, that's the first call to make, not the last one. Contra Costa County's Environmental Health division can confirm whether a parcel is on record as sewer connected or septic served, and a title report will usually reflect it as well.
If you're on Central San sewer
The good news is straightforward. There is no EBMUD style lateral certificate to chase down. Central San doesn't run a mandatory point of sale camera inspection program the way EBMUD does in its own service area. That doesn't mean the sewer line is irrelevant to your sale. California's standard disclosure forms still require you to note any known material defects, and a buyer's general inspector may flag visible signs of trouble, root intrusion near the cleanout, slow drains, old cast iron or clay piping, that would prompt a closer look. But you're not required to produce an agency certificate before you can close, and it's worth saying so plainly to a buyer's agent who assumes otherwise because they're used to working in Oakland or Berkeley.
If you're on septic
This is where the real preparation lives. California doesn't have one statewide law mandating septic inspections before every sale, but in Contra Costa County, the practical reality is that a functioning septic system is treated almost like a required condition of closing. Environmental Health reviews septic system design and inspects construction, and a system that hasn't been evaluated in years is a liability at the negotiating table even if no one forces the issue on paper.
A basic septic inspection in California typically runs $300 to $600, with a fuller inspection that includes pumping landing closer to $550 to $900. The county recommends pumping every three to five years, or sooner if sludge builds up within 12 to 18 inches of the outlet tee. Most septic tanks last 25 to 30 years with reasonable maintenance, which means a home built in the 1990s or earlier is worth a second look regardless of whether anything seems wrong on the surface.
The disclosure piece isn't optional. California's Transfer Disclosure Statement and Seller Property Questionnaire both require sellers to note known material defects, and septic condition falls squarely under that umbrella. A seller who knows the drain field has been slow to absorb water, or that the tank hasn't been pumped in a decade, needs to say so before an offer is accepted, not after. Concealing a known issue exposes a seller to rescission and legal claims well after the sale has closed.
There's also a financing wrinkle worth knowing before you list. Most conventional lenders will not finance a home with a septic system that fails inspection, which narrows the buyer pool to cash offers until the system is repaired or replaced. A pre-listing septic inspection, done quietly before the home ever hits the market, gives a seller the chance to fix a problem on their own timeline instead of a buyer's.
What it costs to switch sides
Occasionally a buyer's lender or a buyer's own preference pushes the conversation toward converting a septic property to sewer service. Central San's own numbers put total connection fees at roughly $9,200 to $10,200 per residential unit, depending on location, and those fees are due just before the physical connection happens. The larger portion of that cost can be financed through Central San directly on the property tax bill, which softens the blow but doesn't erase it. Abandoning the old septic tank properly is also part of the process, since Contra Costa County Environmental Health requires tanks to be formally taken out of service, not just disconnected and left in the ground.
This isn't a cost most sellers need to absorb. It only comes up when a specific buyer or a specific loan program requires it. But knowing the number in advance means it can be negotiated into the deal deliberately, rather than discovered in escrow with three weeks to figure out who pays for what.
What this means before you list
The practical move for any Alamo seller is simple and takes one phone call: confirm whether your property is on Central San sewer or septic before you do anything else related to plumbing paperwork. If you're on sewer, you can stop worrying about an EBMUD style certificate that was never going to apply to you. If you're on septic, get ahead of the inspection and pumping schedule now, while you still control the timeline, instead of during a 17-day contingency period when a buyer's patience is finite.
Alamo's unincorporated status means there's no city hall handling any of this locally. Every piece of it, from ADU permits to septic reviews to building inspections, routes through Contra Costa County. That's not a complication so much as a fact of how the town works, and it rewards sellers who ask the right question early rather than the ones who assume their neighbor's experience in a different East Bay city applies to them.
A few questions worth asking before you list
Does Alamo have its own city sewer department I should contact? No. Alamo is unincorporated, so sewer service runs through Central Contra Costa Sanitary District and septic oversight runs through Contra Costa County's Environmental Health division. There's no separate town agency in between.
If my septic inspection turns up a problem, do I have to fix it before listing? Not legally, but you do have to disclose it. Many sellers choose to repair known issues before listing specifically because undisclosed or unresolved septic problems shrink the buyer pool to cash offers only.
Is a septic inspection the same as a regular home inspection? No. A general home inspector typically doesn't evaluate the septic system in detail. That requires a separate visit from a licensed septic contractor or a Registered Environmental Health Specialist.
Every Alamo property carries its own set of these details, and they're worth sorting out well before a sign goes in the yard. If you're weighing a sale and want a clear read on which camp your home falls into and what that means for your timeline, Linda Traurig has spent years walking Tri-Valley sellers through exactly this kind of local detail. Reach out for a conversation, or start with a free instant home valuation to see where your Alamo property stands today.
