Can You Wash Your Trash Bin in the Driveway? Storm Drain Rules in Contra Costa County
In Contra Costa County, only rain is allowed down the storm drain. Dirty wash water from a trash bin running down your driveway into the gutter breaks that rule. Here’s how to clean a bin without it.
Key takeaways
- In Contra Costa County, it’s illegal to let anything other than rainwater go down a storm drain.
- Storm drains carry water untreated to local creeks, the Bay, and the Delta. They don’t go to a treatment plant.
- Trash bin wash water carries food residue, germs, and cleaning products, so it shouldn’t reach the gutter.
- Cleaning products labeled “non-toxic” or “biodegradable” can still harm wildlife.
- If you wash a bin yourself, contain the water and keep it off the street. Or hire a service that captures it.
Rinsing your trash bin in the driveway is fine only if none of that water reaches the street, because in Contra Costa County, it’s illegal to let anything other than rainwater go down a storm drain. Most driveways slope toward the gutter, and most gutters lead to a storm drain.
This piece explains the rule, why it exists, and how to clean a bin without breaking it.
What the rule says
The Contra Costa Clean Water Program puts it plainly: only rain down the drain. Federal, state, and local regulations prohibit discharging anything but rainwater into the storm drain system. That covers dumping wash water into a storm drain, hosing a surface into one, and leaving wash water where rain will carry it there later.
Cities in the county, including Walnut Creek, publish the same guidance for residents and businesses. Violations can lead to citations and fines.
Why it matters
Storm drains and sewers are two separate systems. Water from your sink and toilet goes to a treatment plant. Water in the storm drain doesn’t. It flows untreated to local creeks, the Bay, and the Delta. In Danville, that means creeks like San Ramon Creek.
Trash bin wash water is about as dirty as household water gets. It carries rotting food residue, bacteria, grease, and whatever cleaner you used. And the county’s guidance is clear that cleaning products labeled “non-toxic” or “biodegradable” can still harm wildlife once they reach a creek.
How to wash a bin yourself without breaking the rule
- Scrape first. Scoop out solid gunk and throw it away before you add any water. Less residue means dirtier water in smaller amounts.
- Move away from the gutter. Wash the bin on a lawn or landscaped area, well away from the street, where the ground can soak up the water.
- Use as little water as you can. A bucket and brush beats a running hose.
- Keep soap and disinfectant out of runoff. Apply disinfectant after the bin is clean, follow the label, and let it do its work inside the bin rather than hosing it out across the yard.
- Check where it ends up. If water starts running toward the sidewalk or street, stop and redirect it.
If your only option is a sloped driveway that drains to the street, that’s a sign to hand the job off.
How professional bin cleaners handle it
Mobile washing businesses fall under the same rule. The county’s guidance for mobile cleaners is to block storm drains, contain the wash area, collect the wash water, and dispose of it properly, typically to the sanitary sewer under the local sanitary district’s requirements. Central San, which serves Danville, Alamo, San Ramon, Walnut Creek, and much of central Contra Costa County, has a permit process for exactly this.
That’s why capturing the dirty water is one of the four steps in every Bin Bliss cleaning. We deep clean and sanitize your carts at the curb, the day after pickup, and the wash water leaves with us instead of running down your street. To book in Danville, San Ramon, Alamo, or nearby, text CLEAN to (888) 888-8888. For more on why rinsing alone falls short, see what’s growing in your trash bin.
Reporting a problem
If you see someone dumping wash water, paint, or anything else into a storm drain, you can report it to the Contra Costa Clean Water Program at 1-800-NO-DUMPING (1-800-663-8674).
Next time you rinse something in the driveway, follow the water. If it reaches the gutter, it’s headed for a creek.
Sources
Frequently asked questions
Is it illegal to wash my trash can in the street?
Letting the wash water reach the storm drain is. In Contra Costa County, only rainwater is allowed into the storm drain system, and water in the street or gutter usually ends up there.
Can I use biodegradable soap to clean my bin?
You can use it, but don’t let it reach the storm drain. The Contra Costa Clean Water Program notes that products labeled “non-toxic” or “biodegradable” can still harm wildlife.
Where is it OK for bin wash water to go?
Keep it off the street and out of the gutter. Small amounts on a lawn or landscaped area away from the street are the practical option for homeowners. Businesses typically collect it and discharge it to the sanitary sewer under their local sanitary district’s rules.
Do storm drains go to a treatment plant?
No. In Contra Costa County, storm drains carry water untreated to local creeks, the Bay, and the Delta. Only the sanitary sewer goes to a treatment plant.
Who do I contact about storm drain pollution?
The Contra Costa Clean Water Program at 925-313-2360, or report dumping at 1-800-NO-DUMPING (1-800-663-8674).
Keep reading
Trash Bin Cleaning in Danville, CA: A Local Guide to Your Black, Blue, and Green Carts
In Danville, food scraps go in the green cart, which makes it the smelliest bin at most homes. Here’s how Danville’s three carts work, which ones need cleaning most, and how often.
Trash Bin Cleaning for HOAs: A Guide for Blackhawk, Diablo, Alamo, and Danville Communities
Dirty carts become an HOA problem when odor, flies, and complaints reach shared spaces. Here’s how community-wide bin cleaning works, what boards usually weigh, and how to set it up in the San Ramon Valley.
New to Danville or San Ramon? How Trash, Recycling, and Organics Work Here
Danville and San Ramon sit side by side but use different trash companies, different cart colors, and different phone numbers. Here’s what new residents need to know.
Disclaimer: This article is for general informational purposes and reflects the information available to us when it was written. It isn’t medical, health, or professional cleaning advice. Always follow the directions on any cleaning or disinfecting product’s label, never mix cleaning chemicals, and check your city’s rules before letting wash water run into a street or storm drain. We make no warranty as to accuracy or completeness and provide this content “as is.” Product names and trademarks are the property of their respective owners.