# Job Hazard Analysis: Sewer line repair URL: https://hardhatbinder.com/en/jha/plumbing/sewer-line-repair Last updated: 2026-10-23 Excavate to expose a broken or root-damaged building sewer lateral (typically 4-in or 6-in clay, cast iron, or PVC) in a yard, driveway, or street. Cut out the damaged section, install new PVC pipe with shielded couplings, test, backfill, and restore the surface. Work uses a mini excavator, concrete saw when paving must be cut, and a trench box or shoring when the trench is 5 ft or deeper. Expect raw sewage, possible sewer gas, buried utilities, and outdoor weather. > A general example for this task. Your JHA should reflect your crew, equipment and site — review it with a competent person before work starts. ## Steps, hazards and controls ### 1. Call 811, mark utilities, and set up the work zone - **Striking a buried gas, electric, or water line while digging** (High): Confirm the 811 ticket is active and all utilities have marked before any digging.; Walk the site and look for meters, cleanouts, and private lines the 811 locate will not mark.; Hand dig or pothole within the tolerance zone of every marked line. - **Traffic, pedestrians, or homeowners walking into the work area** (Medium): Set cones, barricades, and caution tape around the dig area and spoil pile.; Use a flagger and traffic signs if the work is in or next to the street.; Wear a high-visibility vest near traffic. ### 2. Saw-cut paving and excavate with the mini excavator - **Silica dust from cutting concrete or asphalt with the concrete saw** (Medium): Use a saw with a water feed and keep water flowing the whole cut.; Keep other workers upwind and away from the cutting area.; Wear a respirator if required by the silica exposure plan, plus safety glasses and hearing protection. - **Being struck or pinned by the excavator bucket, boom, or swinging house** (High): Keep everyone outside the swing radius while the machine runs; mark it with cones.; Use one assigned spotter with agreed hand signals; the operator stops if the spotter is out of sight.; Only trained operators run the excavator; wear seatbelt and check backup alarm. - **Loud noise from the saw and excavator** (Low): Wear earplugs or earmuffs while the saw or machine is running nearby. ### 3. Protect the trench and set up safe access - **Trench cave-in burying a worker** (High): Install a trench box, shoring, or slope the walls before anyone enters a trench 5 ft or deeper.; The competent person inspects the trench before each shift and after rain or any change, and gives the OK to enter.; Keep spoil piles, pipe, and tools at least 2 ft back from the edge; keep the excavator back from the edge.; Never enter the trench outside the protective system or while the bucket is digging. - **Falls while climbing in or out of the trench** (Medium): Place a ladder within 25 ft of every worker in trenches 4 ft or deeper, extending 3 ft above the edge.; Put barricades or cover the open trench when no one is working. - **Sewer gas (hydrogen sulfide) or low oxygen collecting in the trench** (Medium): Test the air with a 4-gas monitor before entry in trenches over 4 ft and keep it running in the trench.; If the alarm sounds, get out right away and ventilate with a blower before re-entry. ### 4. Stop flow and cut out the damaged pipe - **Contact with raw sewage (bacteria, hepatitis A)** (Medium): Have the owner stop using water and drains; plug the line upstream or pump down before cutting.; Do not eat, drink, or smoke until you wash hands and face with soap and water.; Wear nitrile gloves under cut-resistant gloves, rubber boots, and a face shield when cutting a full line. - **Cuts and flying chips from the reciprocating saw, snap cutter, or abrasive saw** (Medium): Use a soil-pipe snap cutter for cast iron instead of an abrasive saw when possible.; Check guards and blades before use; use GFCI-protected cords or battery tools in the wet trench.; Wear safety glasses and a face shield while cutting. - **Back strain from bending and lifting heavy cast iron in the trench** (Medium): Use the excavator with a rated sling or two people to lift pipe sections over 50 lb.; Lift with your legs and keep the load close to your body. ### 5. Install new PVC pipe and couplings, then test - **PVC primer and cement vapors and flammability** (Low): Use shielded no-hub couplings where possible to reduce glued joints.; Read the SDS, keep lids closed, and keep cans away from flames, saws, and smoking.; Wear nitrile gloves and safety glasses when applying primer and cement. - **Hand pinch points while setting pipe and tightening coupling clamps** (Low): Keep fingers out from between pipe ends; use a torque wrench, not your hands, to seat clamps.; Wear work gloves. ### 6. Backfill, compact, and restore the surface - **Worker in the trench while backfill is pushed in** (High): Do a headcount and confirm the trench is clear before the operator pushes in backfill.; Pull the trench box only as backfill reaches safe depth; no one enters unprotected sections. - **Vibration, noise, and foot injuries from the plate or jumping-jack compactor** (Medium): Rotate operators to limit time on the compactor.; Do not run gas compactors in a deep trench without air monitoring; carbon monoxide builds up.; Wear steel-toe boots and hearing protection. ### 7. Clean up and decontaminate - **Spreading sewage contamination to tools, trucks, and home** (Medium): Wash tools, boots, and gloves with disinfectant at a set wash area before loading the truck.; Bag contaminated rags and old pipe; dispose of them as directed by the supervisor.; Wash hands and face before eating or leaving the site. - **Trips over tools, hoses, and debris** (Low): Pick up hoses, cords, and debris as you go; keep walkways clear. ## Required PPE - Hard hat — At all times in and around the excavation and equipment. - Safety glasses — ANSI Z87.1 at all times; add a face shield when cutting pipe or paving. - Gloves — Nitrile under cut-resistant work gloves when handling sewer pipe or sewage. - Rubber boots or steel-toe boots — Waterproof steel-toe boots in the trench and around sewage. - High-visibility vest — When working near traffic or moving equipment. - Hearing protection — Earplugs or earmuffs when using the concrete saw, compactor, or near the excavator. - Respirator — When required by the silica plan for saw cutting; fit-tested workers only. ## Training - Competent person for excavations designated and on site to inspect the trench and protective system. - Trench and excavation safety training for all crew who enter the trench. - Mini excavator operator training and evaluation; spotters trained in hand signals. - Silica training and respirator fit test for workers who cut concrete or asphalt. - Hazard communication training on PVC primer and cement and sewage hazards; gas monitor use. - First aid and CPR for at least one crew member; tetanus and hepatitis A vaccines recommended. ## Emergency If a trench caves in: stop all work and shut down the excavator. Call 911 and give the exact site address. Do not jump into the trench to dig; more soil can fall. Keep everyone and equipment back from the edge until rescue arrives. Give first aid only if it can be done safely from outside the trench. ## Official sources - [29 CFR 1926.651](https://www.ecfr.gov/current/title-29/section-1926.651) — Excavations — specific requirements - [29 CFR 1926.652](https://www.ecfr.gov/current/title-29/section-1926.652) — Requirements for protective systems - [29 CFR 1926.602](https://www.ecfr.gov/current/title-29/section-1926.602) — Material handling equipment - [29 CFR 1926.1153](https://www.ecfr.gov/current/title-29/section-1926.1153) — Respirable crystalline silica - [29 CFR 1926.59](https://www.ecfr.gov/current/title-29/section-1926.59) — Hazard communication - [29 CFR 1926.28](https://www.ecfr.gov/current/title-29/section-1926.28) — Personal protective equipment - [29 CFR 1926.21](https://www.ecfr.gov/current/title-29/section-1926.21) — Safety training and education - [29 CFR 1926.50](https://www.ecfr.gov/current/title-29/section-1926.50) — Medical services and first aid --- Source: HardHat Binder, operated by Leadspire LLC. Templates to be reviewed by a competent person before use; not legal advice; not affiliated with OSHA.