Advancing the Home Inspection ProfessionMy Account Apply for Membership My Account Apply for Membership North American Association of Home Inspectors 16192 Coastal Highway, Lewes, Delaware 19958 AHI Ancillary Sewer Scope Inspection Standards of Practice (SewerSOP) Section 1: Purpose and Scope 1.1 Purpose: The purpose of this document is to establish a uniform, consistent, and legally defensive standard for conducting a baseline lateral sewer line video camera assessment of residential and commercial real property throughout North American jurisdictions. 1.2 Alignment with AHI Base Standards: This Ancillary Standard is designed to function as an authorized addendum to both the core AHI Residential Standards of Practice and the AHI Commercial Standards of Practice (ComSOP). It explicitly expands the scope of work to evaluate components that are traditionally excluded under standard property inspection guidelines (specifically, underground main waste and drainage systems). 1.3 Scope of Assessment: The inspection is strictly limited to a non-invasive, visual evaluation of the interior condition of the primary underground lateral sewer pipe. This assessment tracks the line from the main structure's exterior foundation footprint to its termination or transition point at either the municipal main line utility tap or a private septic tank system. Section 2: Definition of Key Terms Access Point / Vector: The structural entry point used to insert the camera equipment, including but not limited to exterior clean-outs, interior clean-outs, roof vents, or the open flange/drain resulting from the physical removal of a toilet or commercial floor sink. Functional Flow: The structural ability of waste and water to exit the property unobstructed, without persistent hydraulic back-pressure, structural pooling, or active backups. Lateral Sewer Line: The primary buried waste conduit that collects the combined discharge of all interior plumbing fixtures and carries it away from the building foundation. Sonde (Transmitter): A 512Hz radio-frequency transmitter located directly inside the camera head, allowing an above-ground locator receiver wand to pinpoint the physical location and depth of underground pipe failures. Heavy Torque: Excessive mechanical rotational force applied with heavy hand tools (such as pipe wrenches or cheater bars) to loosen corroded, rusted, or seized clean-out caps. Section 3: Procedural Standards (The Field Examination) An ancillary sewer scope inspection conducted under this standard requires the following systematic operational steps: Pre-Operational Risk Assessment: Perform a visual and mechanical check of the intended access point to evaluate structural integrity and stability before applying tools or introducing equipment into the system. Determination of Entry Vector: Prioritize entry points based on access safety and safety of the equipment. In accordance with professional industry experience, if an exterior clean-out is unavailable, frozen, or carries an excessive risk of material failure, the preferred entry vector shall be the **temporary removal of a toilet or access via an interior utility drain** to access the main waste line through the plumbing flange. Camera Deployment: Carefully feed the push-rod through the lateral line while continuously monitoring the live color video feed to evaluate pipe conditions. Hydraulic Testing: Run water through interior fixtures immediately prior to and during the camera push to evaluate pipe gradient efficiency, check structural flow, and reveal hidden sags. Location and Mapping: Activate the 512Hz sonde transmitter to trace and document the above-ground location and depth of any critical structural flaws or blockages. Section 4: Items to Describe and Report 4.1 System Attributes: The final written report must explicitly describe the following system characteristics: The exact access vector utilized for the inspection (e.g., *Exterior 4-inch PVC clean-out*, *Main bathroom toilet removed*, *Janitorial slop sink removed*). The specific composition of the piping materials encountered (e.g., Cast Iron, Clay, PVC, ABS, Orangeburg, Concrete). The approximate total linear distance traveled by the camera head before termination. 4.2 Deficiencies and Abnormalities: The inspector shall document and report the following structural, mechanical, and hydraulic defects: Structural Failures: Visible cracks, fractures, missing pipe sections, or total structural pipe collapses. Joint Anomalies: Offset joints, pipe misalignments, separations, or root-compromised joints. Mechanical Blocks: Intruding root masses, foreign objects, severe mineral scale/tuberculation, or excessive grease dams and FOG (Fat, Oil, Grease) encrustation. Hydraulic Faults: Visible pipe sags or "bellies" evidenced by the camera head becoming completely submerged in standing water where water should be draining freely. Section 5: General Limitations and Exclusions The AHI SewerSOP is strictly a visual survey limited by the physical realities of underground infrastructure. The assessment explicitly excludes: Forcing or sliding the camera head past severe blockages, absolute collapses, or heavy root masses that pose an immediate risk of trapping or damaging the equipment. Applying heavy torque to old, frozen, or corroded clean-out caps that risk fracturing the clean-out hub or adjacent main waste line stack. Re-installing any removed fixture (such as a toilet) with its old, pre-existing wax ring or seal. If a fixture is removed to facilitate system entry, the inspector **must install a brand-new wax ring or appropriate gasket**, securely fasten the mounting bolts, and perform operational leak-testing under functional pressure. Performing chemical flushes, mechanical hydro-jetting, or clean-out operations to clear away standing sludge, debris, or roots to improve camera visibility. Inspecting municipal main lines, structural connections to city taps, or the interior baffles and chambers of private septic tanks. Section 6: Comprehensive Liability and Risk Mitigation Framework 6.1 Equipment Entrapment Limit (Stuck Camera Clause): Underground lateral lines are frequently unstable. If the inspector's push-camera becomes wedged, trapped, or snagged inside the lateral line due to an unmapped pipe defect (such as a shifted offset or structural collapse), the inspector is not liable for any costs associated with excavation, trenching, concrete jackhammering, or property restoration required to retrieve the camera equipment. 6.2 Pre-Operational Material Failure Release: Brittle materials like aging cast iron, clay, or weathered plastic clean-out caps can shatter under normal handling. If a clean-out cap shears or an aging closet bolt snaps during a standard, cautious attempt to open or access the system, the inspector is released from liability for plumbing repairs or secondary water damage caused by the structural failure of those pre-existing, degraded components. 6.3 Financial Ceiling (Liquidated Damages): The total aggregate liability of the inspection company, its employees, and agents for errors, omissions, or professional negligence within this ancillary assessment shall be strictly capped at a sum equal to **two (2) times the specific fee paid for this ancillary sewer camera service**. Section 7: The Sewer Condition Report (SCR) 7.1 Report Requirement: The inspector shall provide the client with a written Sewer Condition Report (SCR) and access to the complete digital video recording of the lateral line push. While the client is advised to consult a licensed plumbing contractor for structural repairs, the inspector is required to deliver a professional diagnostic summary that classifies the timeline and urgency of necessary remediations. 7.2 Remediation Urgency Classifications: Deficiencies identified within the lateral line must be categorized into one of the following two actionable levels to assist the client in risk management: Immediate Remediation (Critical/Active Failures): Material defects that cause an active obstruction, present an imminent threat of raw sewage backup, or represent total structural pipe failure. This includes complete pipe collapses, severe root blockages choking more than 50% of the pipe diameter, heavy standing sewage pools, or structural sags (bellies) where the camera lens is completely submerged under stagnant water for more than 5 linear feet. These conditions require immediate professional plumbing intervention before the close of the real estate transaction or the resumption of standard building operations. Short-Term Remediation (Monitored/Predictive Defects): Material defects that currently allow functional flow but exhibit progressive structural decay likely to cause a system failure or line backup within 12 to 24 months. This includes early-stage hairline root intrusions at pipe joints, minor pipe offsets under 1 inch, moderate cast iron scale/tuberculation restricting smooth waste flow, or localized cracking without wall displacement. The report shall advise the client to plan for near-term maintenance, hydro-jetting, or localized pipe lining. 7.3 Diagnostic Deliverables: To maintain a legally defensive framework and provide professional clarity, the final Sewer Condition Report must include: The exact linear distance (in feet or meters) from the entry vector to the location of each reported defect, verified by the digital distance counter or physical push-rod markings. High-resolution video still-images embedded directly into the report body depicting every identified Immediate and Short-Term remediation item. A permanent, accessible digital link or physical storage media containing the unedited video recording of the entire inspection push, complete with the inspector's synchronous voice-over commentary detailing the field findings. This standard is provided as an open-source framework by the North American Association of Home Inspectors (AHI) for residential and commercial property due diligence.

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