Grading permits, perc tests and 811 in the Antelope Valley
The Antelope Valley is two counties, two cities with their own permit counters and a lot of unincorporated land, and the dirt rules change at every boundary. This page lays out who issues what, the thresholds that decide whether a job needs a permit at all, the order the septic paperwork runs in and the one rule that applies everywhere: a DigAlert 811 ticket two working days before any digging.
Poppy Excavation publishes this so you can plan a build before you hire anyone. The licensed contractor we refer pulls the permits and schedules the inspections; your job is knowing what to expect.
Who issues what, town by town
| Where the lot is | Grading permit | Septic approval |
|---|---|---|
| Lancaster (city limits) | City of Lancaster Engineering / Building and Safety | LA County Public Health (outside the sewer district) |
| Palmdale (city limits) | City of Palmdale Public Works / Building and Safety | LA County Public Health (outside the sewer district) |
| Quartz Hill, Lake Los Angeles, Littlerock, Pearblossom, Antelope Acres | LA County Building and Safety, Antelope Valley field office | LA County Public Health, onsite wastewater program |
| Acton, Agua Dulce, Leona Valley | LA County Building and Safety plus Regional Planning (Hillside Management Area) | LA County Public Health; county geologist for fault zones |
| Rosamond | Kern County Public Works, Building and Development | Kern County Environmental Health |
| California City | City of California City Building Department | Kern County Environmental Health |
The City of Lancaster permits page and LA County’s grading guidelines are the two documents most valley owners end up reading. Kern County’s septic rules are in its onsite systems manual.
The grading permit threshold
The California Building Code’s grading appendix sets the exemptions the valley agencies use: an excavation under two feet deep that does not create a steep cut over five feet, a fill under a foot deep that does not exceed 50 cubic yards on one lot or obstruct a drainage course, and work that is part of an already-permitted building foundation. Everything else needs a grading permit, a plan and usually a compaction report at the end. A pad for a house or manufactured home exceeds the fill or volume line nearly every time. A trench, a pool dig under a building permit or a brush clearing that leaves the soil alone usually does not.
The septic paperwork, in order
- 1
Confirm the lot is outside a sewer district
Core Lancaster and Palmdale are sewered. Everything else in the service area is onsite wastewater. The sanitation district or the title report settles it.
- 2
Perc test and site evaluation
An engineer bores test holes at the proposed field and measures percolation. LA County Public Health and Kern County Environmental Health each publish the test protocol. $1,200 to $3,000.
- 3
System design and county review
The design, sized by bedroom count and perc rate, goes to the county program for approval. Setbacks from wells, property lines and structures are checked here.
- 4
Grading permit if the pad is part of the job
Runs in parallel through the city or county building department so the two approvals do not wait on each other.
- 5
Open-trench inspection, then final
The county inspects the tank and field before backfill, then signs off after connection. The permit closes and the home gets its occupancy.
811: the rule with no exceptions
California Government Code requires anyone who excavates to contact DigAlert at least two working days before digging. The ticket is free, the marks are good for 28 days and the utilities paint gas, power, water, sewer and fiber on the ground. It applies to a homeowner with a rented trencher as much as to a contractor. On acreage the public utilities often stop at the road, so the contractor also asks about private lines: the old well line, the propane run, the line to the barn.
Hillside, fault zone and fire rules in the foothills
Acton, Agua Dulce and Leona Valley bring three extra layers. Lots with natural slopes of 25 percent or more fall in LA County’s Hillside Management Area, which adds a conditional use permit and a geotechnical report. Leona Valley’s floor sits in an Alquist-Priolo earthquake fault zone, where a geologic report locates the fault trace and sets a structure setback that can move the pad. All three are very high fire hazard severity zones where defensible space is required and brush clearance is part of every site package. Expect months rather than weeks for a hillside build’s approvals, and start the geologist before the grader.
Verifying the contractor
California requires a contractor license for any job over $1,000, and the classes for this work are C-12 (earthwork and paving), A (general engineering) and C-42 (sanitation systems) for septic. The CSLB license check shows the class, the bond, the workers compensation status and any complaints. We check it before every referral; you should check it before you sign. Poppy Excavation itself holds no license and never quotes as the contractor.
Permit questions
At what point does dirt work need a grading permit?
Under the California Building Code grading appendix, as enforced by LA County and the cities, work is exempt only when it moves under 50 cubic yards, cuts under about two feet, fills under about a foot and leaves every drainage course alone. A building pad crosses one of those lines almost every time; a shallow utility trench usually does not.
Who pulls the permit, me or the contractor?
The licensed contractor, in nearly every case. The permit is tied to the licensed party doing the work, the compaction report comes from the soils engineer the contractor coordinates with, and the inspection scheduling is theirs. The fee appears as its own line in the quote.
How long does a perc test and septic approval take?
The test itself is a day or two of field work. LA County Public Health review typically runs several weeks to a few months depending on the design and the season. Kern County is usually faster. Start it before the house plans are final, because the result can move the house.
Do I need a stormwater permit for a house lot?
Only if the project disturbs an acre or more, which triggers coverage under the state Construction General Permit and a stormwater pollution prevention plan. A single house pad on a 2.5 acre lot usually disturbs less than an acre. Larger clearings, long driveways and multi-structure sites can cross it, and the contractor will say so.
Let the contractor handle the paperwork
Call (661) 466-2785 or send the form below and one licensed contractor calls you back within one business day.