Lost something in Mountain House? File a report and let us handle the rest.
One report reaches the San Joaquin County Sheriff, Mountain House Animal Control, RTD Transit, and local community channels. Your report stays active, continuously matching against new found items so you don't have to check every day.
What did you lose?
If there isn’t an adequate suggestion, select “Other – My item isn’t listed” and enter the item’s category. You can provide details later.
Publishing your report is free and your details stay private. The assisted search is a separate paid service, described in the Terms.
Recent activity
California : found property must be held by law enforcement for at least 90 days before it can pass to the finder, be auctioned or disposed of. (California Civil Code §2080.2)
Across the United States
- Wrislet clutch gray/silver bag with documents · Chicago, IL, October 8
- Ring TM on top · Greensboro, NC, October 8
- Keys · Sarasota, FL, October 8
- Keys · Brookline, MA, October 7
- Camera · Monterey, CA, October 7
Local contact details reviewed on October 7, 2026.
How ReportLost works in Mountain House
You describe what you lost
Tell us what went missing, where you lost it, and any details that help identify it. We gather the right information so authorities and community channels have a complete picture.
We notify the right channels
Your report goes to the San Joaquin County Sheriff's office, Mountain House Animal Control (if applicable), RTD Transit if it was on a bus, and gets shared with local lost and found networks and community groups.
Your report keeps searching for you
For your entire search period, your report automatically compares new found items, community posts, and marketplace listings against your description. You'll get an alert the moment a credible match surfaces, so you can follow up immediately without monitoring social media or calling around yourself.
Where to report a lost item in Mountain House
Local resources and what each one handles
San Joaquin County Sheriff
The Sheriff's office provides law enforcement services to Mountain House and manages property reports. If you've lost a personal item in a public space or suspect theft, this is the official place to file a report. We identify which precinct covers your loss location and generate the details you'll need.
Mountain House City Hall
City Hall can help direct you to the right department depending on where you lost your item and can log community concerns. They also maintain information about local services and may have records of items turned in at public facilities.
RTD Transit Lost and Found
If you left an item on a San Joaquin Regional Transit bus or at an RTD facility, their dedicated lost and found team can search their records. Call them directly with details about your trip, and they'll check if your item has been turned in. We point you to the exact process and what information to have ready.
Lost Pet Reports
If your cat, dog, or other pet is missing, time is critical. Mountain House Animal Control coordinates with local shelters and community networks. The Mountain House Lost & Found Pets Facebook group connects residents directly, and several tools like PawBoost and Pet911 amplify your reach across the wider region. For faster, prioritized matching and outreach, file a priority lost pet report with ReportLost.
⚠️ Spotted incorrect or outdated information? Let us know so we can review it.
Start protecting your lost item now
The sooner your report is active across all channels and community networks, the sooner local searchers and residents can help reunite you with what you've lost. A few minutes to report now means your item is already being matched against found items while you focus on other things.
Report my lost item →Losing something in Mountain House disrupts your day, and the scattered nature of local services makes recovery feel like a puzzle you have to solve yourself. Between the San Joaquin County Sheriff, RTD Transit lost and found, Animal Control, Facebook groups, and community word-of-mouth, there's no single place that ties everything together or keeps searching once you've filed an initial report.
ReportLost simplifies the entire process. You describe your loss once, and we route the details to every relevant local authority and channel in Mountain House. Better yet, your report doesn't stop searching after day one, two weeks, or a month, it remains active and keeps matching your description against new found items for as long as your search runs. You get a real second chance without the ongoing effort.
Common places where items go missing in Mountain House
Knowing the neighborhood helps us route your report to the right community channels
Downtown & Main Street
Shops, restaurants, and public spaces along the central corridor are high-traffic areas where lost items are frequently turned in to local businesses or reported to City Hall.
RTD Bus Routes & Transit Centers
Items left on buses or at transit stops are the most common reports; RTD's dedicated lost and found system handles these, and we make sure your report reaches them immediately.
Parks & Recreation Areas
Community parks and green spaces are places where personal items like phones, keys, and bags often surface; local residents and park staff frequently turn these in.
Residential Neighborhoods
In quieter areas, items lost outdoors often stay within the community network; neighborhood Facebook groups and word-of-mouth are powerful recovery tools we tap into.
Community channels actively searching
Mountain House residents and local groups help reunite lost items every day
Active Facebook group for lost and found pets in the area
Regional Facebook community covering Mountain House and nearby neighborhoods
Hyper-local lost and found alerts from your immediate neighborhood
Transit authority posts and alerts about items left on buses
Questions about losing items in Mountain House
How long will the Sheriff hold a lost item before disposing of it?
The San Joaquin County Sheriff typically holds property for a reasonable period; check with the Mountain House station at (209) 468-4400 for specific retention timelines, as they vary based on item type and value.
If I lose something on an RTD bus, how long does RTD keep it?
Contact RTD Lost and Found at (209) 943-1111, option 1, during business hours to ask about hold periods. Items are typically held for a set period before disposal, so prompt follow-up is important.
What should I do if I find a lost pet in Mountain House?
Call Mountain House Animal Control at (209) 831-2300, post in the Mountain House Lost & Found Pets Facebook group, and check for a microchip by visiting a local vet. Do not assume it's abandoned, as many lost pets are being actively searched for.
Can I file a report with the Sheriff online, or do I have to call?
Contact the Sheriff's non-emergency line at (209) 468-4400 to ask about online or in-person reporting options for lost property. Some items may be handled differently depending on circumstances.
Does my report actually stay active after I file it, or do I have to keep calling?
With ReportLost, your report stays active for your entire search period and automatically matches new found items, social posts, and community reports against your description. You won't have to call multiple agencies or check Facebook every day, you'll get an alert when a credible match comes in.
Is ReportLost.org an official government service?
No, ReportLost is an independent service that works alongside official local agencies like the Sheriff and Animal Control. We're not part of the government, but we route your report to the right official channels and activate community networks to keep searching for you long-term. We complement, not replace, official reporting.
Lost & found in nearby cities
File your report and rest easier
Once your loss is in the system and spreading across local channels, the hard part is done. You can move forward knowing that your report is actively searching and matching, and you'll get a notification the moment someone finds something that fits your description.
Start my report →ReportLost.org is an independent service and is not affiliated with the San Joaquin County Sheriff's Office, Mountain House City government, RTD, Mountain House Animal Control, or any local Facebook groups or community organizations. We route your report to these official channels and community networks on your behalf, but you remain responsible for following up with them directly. Always report lost pets and items of significant value to official law enforcement and animal services through their official channels as well.