CONTRA COSTA COUNTY, CALIFORNIA – If you’ve ever looked down on a walk and noticed a beautiful round metal disk stamped “Central San,” you’ve just found the starting clue for the county’s strangest scavenger hunt.
Central Contra Costa Sanitary District–better known as Central San–has been rolling out redesigned “maintenance access covers” (the technical term for manhole covers) and encouraging residents to spot them, snap photos, and learn what’s flowing just beneath our feet.
Why these covers are special
A few years back, Central San’s board approved a makeover for its 50-year-old, diamond-patterned lids that used to read “CCCSD.” Why? Their official report says the old ones “looked dated” and also included unnecessary information like the name of the metal foundry that made the covers.
The new design spells out “Central San,” and has beautiful imagery of the East Bay. It ties the utility more clearly to the community it serves, and turns once-overlooked street furniture into mini landmarks. The district maintains roughly 36,700 of these access points, so the upgrade is a long-term effort you’ll see popping up across the East Bay.
Central San wants you to find them
Central San has explicitly invited residents to spot the new lids and send in photos in past editions of its “Pipeline” community newsletter–even offering small thank-you gifts and occasional prize drawings.
The Spring 2024 issue spelled it out: see a new cover, snap a photo, and email it in. Some submissions may even get featured. While deadlines and giveaways change, the spirit of the hunt remains the same–keep your eyes open and share what you find. Central Contra Costa Sanitary District
Where to look
Start with “Go With The Flow,” Central San’s interactive map that follows the path of wastewater along the Iron Horse Trail from San Ramon toward the Martinez treatment plant. The map highlights prominent access covers and trail entry points, turning an ordinary bike ride or stroll into a guided tour of hidden infrastructure.
Why it matters
It’s easy to forget the system under our towns until something goes wrong. Central San’s scavenger-hunt vibe is a clever way to connect people to that invisible network–1,500+ miles of pipe moving what we flush, wash, and rinse to a plant that treats tens of millions of gallons a day before releasing clean water to the Bay. Spotting a handful of covers on your walk is a surprisingly fun reminder of the infrastructure that keeps the East Bay healthy.
