Site Plan Requirements

You will most likely be creating multiple site plans through your project journey. Reference this webpage as you build these site plans.

For a example, a Site Plan for a Site Evaluation will look slightly different than a Site Plan for the Onsite Permit. The reason being is because the Site Evaluation conducted by the Onsite Specialist approves an area in which you can place your septic system in. The approved area will need to be present on the Site Plan for the Onsite Permit.

Standard Requirements for All Site Plans

Entire property drawn proportionally, including ALL existing and proposed structures and septic system(s).
Label all existing structures as “Existing” and all proposed structures as “Proposed”.
Label all existing and proposed structures with the use(s) in that structure.
Distance from proposed structures to property lines.
Distance from proposed structures to existing structures.
Size of all existing and proposed buildings, structures, decks, patios, outbuildings, driveways, and access roads.
Location of all major features (i.e. - canals, irrigation ditches, rim rock ledges, etc.).
Location of any public utility or other easements (canals, power lines/poles) etc.
Dimensions of all property lines.
Location of wells and water sources on subject property.
Arrow indicating North.
Names and location of all streets or roads adjacent to the property

Other Elements to Consider


Permit Type	Additional Requirements
Commercial Construction Requirements	In addition to the STANDARD REQUIREMENTS above, the following are required for commercial structural permits: Drawing must be to-scale. Label all existing and proposed structures with specific commercial use. Location of any required EV infrastructure and the quantity calculation. Exit Discharge Route to the Public Way or Exit Discharge Route to a Safe Dispersal Area. If using a Safe Dispersal Area, must include size calculation and a dimension from building to the safe dispersal area.
Site Evaluation Requirements	In addition to the STANDARD REQUIREMENTS above, the following are required for Site Evaluations for new septic installations: Location of the 3 to 5 Test Pits that are at least 60'-75' apart. Location of wells on adjacent properties if wells are located within 100' of property line.
Onsite/Septic Permit Requirements	In addition to the STANDARD REQUIREMENTS above, the following are required for ONSITE/SEPTIC Permits: Location of the approved Test Pits of this system Distance from septic tank to structure to be served. Minimum of 5’ of separation. Distance from the septic tank to the first distribution or drop box. Distance from the septic tank and system to the property lines. Drain field layout and replacement drain field reserve area. Show length and spacing of drain field trenches. Identify elevation uphill or downhill from the tank to drain field. Difference in elevation of the native soil surface from the septic tank top, at both ends and center of all proposed drain field trenches. Location of wells on adjacent properties if wells are located within 100' of property line.

Example Site Plans

Existing Residence with a Proposed ADU Example - Separate Septic System
#	PDF Link	Description
1A	Site Plan for Site Evaluation	Example of a Site Plan for a Site Evaluation Permit with an existing Residence and Proposed ADU. This example includes illustrations for the required test pits.
1B	Site Plan for Onsite Permit	Example of an Site Plan for an Onsite Permit of a property with existing Residence and Proposed ADU

Proposed Residence Only Example
#	PDF Link	Description
2A	Site Plan for Site Evaluation	Example of a Site Plan for a Site Evaluation proposing a new Residence only, test pits are present.
2B	Site Plan for Onsite Permit	Example of a Site Plan for an Onsite Permit proposing a new Residence Only, approved area by Onsite Specialist present on Site Plan.

Proposed Residence and Proposed ADU Example - Shared Septic System
#	PDF Link	Description
3A	Site Plan for Site Evaluation	Example of a Site Plan for a Site Evaluation proposing a new Residence and new ADU, test pits are present.
3B	Site Plan for Onsite Permit	Example of a Site Plan for an Onsite Permit proposing a New Residence and new ADU, approved area by Onsite Specialist is present on this Site Plan