TYPICAL SEWER AREA STUDY
Below are links to useful references if you have detailed questions regarding Sewer Area Study.
To submit your sewer area study for review, upload your report and supporting information online (link
Submit my report
You can pay the plan check review fees in person or online using e-check / credit card. After you have submitted your report for review, your plan checker will create a fee invoice where you can pay the fee online. Minimum deposit amounting to $2,000.00 will be required to start the review and additional charge may be added depending on the number of hours used by the plan checker towards the approval.
We've been processing paperless plan review since 2013! Accordingly, you can submit all of your reports and supporting documents online at the link provided above. To see a typical list of all supporting documents that are required for obtaining Sewer Area Study approval, here is a Sewer Area study Submittal Checklist.
Resubmittals will be required to address any corrections needed on the Sewer Area Study. Make sure to submit annotated response to plan checker comments on the report and correction list or your resubmittal may be rejected.
For each submittal, a check print showing plan check comments and a corrections list will be generated and sent to the applicant who submitted the report. These documents will address deficiencies in the report and inform you of supporting documents that needed in order to obtain Sewer Area Study approval. The following links to resubmit your plans and to some documents that you should find useful during the sewer improvement plan review:
Resubmit my report
Sewer Area Study Correction List
Before your Sewer Area Study can be approved you may need to approach various jurisdictional agencies to obtain peak discharge Q or outlet approval depending on the boundary of the sewer shed. Lastly, Los Angeles County Sanitation District Will Serve Letter is always required as part of the approval package.
Depending on which entitlement you’re trying to get approval for, the approved sewer area study will
determine if there will be mitigation or not. You may need to submit a sewer plan as part of your
development or improvements of the existing sewers to have a better capacity. The findings on the approved
report will be the basis on proper design of the sewer system.
The approved sewer area study shall be invalidated should there be an increase in the total number of dwelling units, an increase in the density, a change in the proposed sewer alignment, an increase in the tributary sewershed, a change in the sewer connection points, or the adoption of a land use plan or a revision to the current plan. A revision to the approved sewer area study may be allowed at the discretion of the Director of Public Works. The approved sewer area study shall remain valid for two years from the date of sewer area study approval. After this period of time, an update of the area study shall be submitted by the applicant if determined to be warranted by Public Works.
If you have additional questions or concerns, please contact our Final Maps & Sewer Section at (626)
To discuss your project with us in person, please make an appointment with us to meet at our public counter between the hours of 7:00 am and 5:00 pm, M-Th at the address below:
County of Los Angeles Department of Public Works
3rd Floor, Land Development Division
900 South Fremont Avenue
Alhambra, CA 91803