San Bernardino County Perc Testing and Septic Soil Reports
A homeowner and contractor guide to the County’s PERC report, notification, plot-plan, and OWTS review process.
Updated September 15, 2026Read guide
Practice area
Civil Engineering Services
Civil engineering for the land around a building or utility, including site plans, grading and drainage, septic testing and design, topographic mapping, access, and permit support.
CALICORE / CIVIL
Calicore helps property owners, architects, and contractors understand what must happen between a project idea and an approved, buildable civil plan. We confirm the local review path, identify the site information and outside professionals required, complete the agreed civil field and design work, and respond to civil plan-check comments.
01
Grading & Drainage Plans
A grading plan shows how ground elevations will change around a building, driveway, or other improvement. A drainage plan shows where rain and snowmelt will flow. Calicore designs both together for permitting and construction.
How this service works 02Septic & OWTS Design
An onsite wastewater treatment system, or OWTS, is commonly called a septic system. Calicore evaluates the proposed use and site conditions, prepares the civil design, and supports local environmental-health review.
How this service works 03Percolation Testing
A percolation, or perc, test measures how quickly water moves into soil at a proposed wastewater dispersal depth. The result is used with soil conditions, setbacks, groundwater or bedrock separation, and the septic layout.
How this service works 04Soil Testing for Septic Systems
Septic soil testing explained and completed for people who need a county-ready answer—not a maze of unfamiliar testing terms.
How this service works 05Topographic Mapping for Site Design
A topographic map records the elevations, terrain, and visible features needed before grading, drainage, access, utility, or septic design begins. It is an existing-condition engineering base map, not a legal boundary survey.
How this service works 06Civil Drafting & Site Plans
A civil site plan shows how a proposed building, driveway, utilities, drainage, septic system, and other improvements fit on the parcel. Calicore prepares coordinated site plans and civil permit drawings.
How this service works 07Residential Site Development Engineering
Residential site development engineering covers the land and improvements outside the building: its location, access, grading, drainage, utilities, and wastewater. Calicore coordinates this civil work for homes, ADUs, garages, shops, and rural properties.
How this service works 08Barndominium Site Engineering
Barndominium site engineering covers the parcel-specific work that a metal-building package usually does not: the site plan, grading, drainage, access, utilities, septic work, and civil permit coordination.
How this service works 09Utility Civil Engineering
Owner-focused civil engineering for water and wastewater infrastructure, rehabilitation, field coordination, and construction delivery.
How this service works 10Residential Drainage Design
Residential drainage design shows how runoff from roofs, pads, driveways, slopes, and adjacent areas will be collected, conveyed, and discharged without leaving an unresolved site problem.
How this service works 11Rural Site Feasibility Studies
A rural site feasibility study helps an owner understand whether a parcel can support the intended home, shop, ADU, septic system, access, utilities, and drainage before major design or purchase decisions.
How this service works 12ADU Site Engineering
ADU site engineering addresses the parcel-specific civil work outside the accessory dwelling unit itself: location, access, grading, drainage, utilities, wastewater, and permit coordination.
How this service works 13Driveway & Site Access Engineering
Driveway and site-access engineering coordinates grades, drainage, turning, tie-ins, visibility information, and agency requirements so a property can be reached and developed safely within the project scope.
How this service works 14Utility Rehabilitation Engineering
Utility rehabilitation engineering turns condition information, operating constraints, and owner priorities into a practical repair, replacement, or phased-improvement plan.
How this service worksSan Bernardino County
Civil engineering for your city or community.
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What to send us to begin
Send a short description of the work, any plans, specifications, or photographs you have, and tell us what you need the service to provide. Include a project location if it applies.
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