ZIP 91311 falls in Los Angeles County, California, where we hold 48 septic-related documents. We have not classified septic-versus-sewer status for this county, and we do not have a per-ZIP parcel count -- see the county page for what we hold and where the records are kept.
ZCTA 91311 is not entirely inside one county. Land-area share is from the 2020 Census ZCTA-to-county relationship file.
| County | Land in this ZIP | Documents held | On septic (county) | On sewer (county) |
|---|---|---|---|---|
| Los Angeles County, California | 97% | 48 | — | — |
| Ventura County, California | 3% | 36 | — | — |
2 businesses on record with an address in this ZIP: pumping, installation, design, inspection and repair. Not an endorsement, and we take no fee.
| Company | City | Phone | Rating |
|---|---|---|---|
| Drain Kings | Chatsworth | (800) 906-9760 | 4.4 (138) |
| Chatsworth Plumbing Services | Los Angeles | (818) 210-3013 | — |
Land-area overlap is from the 2020 Census Bureau ZCTA5-to-county relationship file, not an estimate of ours. Parcel and document counts are rows we hold, not a survey of every property in the ZIP. Last verified 2026-09-01.
We have not measured septic-versus-sewer status for this county yet.
ZIP 91311 spans 2 counties: Los Angeles County, California, Ventura County, California.