The Sewage Contact Hygiene SOP

Purpose

This procedure keeps raw sewage on the outside of the technician. Sewage carries enteric bacteria, viruses and parasites, and nearly every illness a tech brings home from a backup gets in one of three ways: a hand reaching the mouth, a splash reaching the eyes or mouth, or contact with broken skin. None needs a dramatic event. A tech who wipes sweat off his forehead with a forearm or eats lunch after a bottled-water rinse has done the job right and still taken the exposure home.

Each step names what passing looks like and what to do when it does not. A step fails when skin contact happens, and the failure has a fixed response: stop, wash, report.

Scope

Covers: drain and main-line clearing, toilet pulls, cleanout work, sewage ejector and grinder pump service, small backups inside a home, and any crawlspace or basement work where sewage is present on surfaces.

Does not cover:

• Entry into a sewer, septic tank, wet well or any permit-required confined space. That is a permit crew with atmospheric monitoring under 29 CFR 1910.146, not this procedure. Nobody enters to retrieve a dropped tool.
• Sewer gas and hydrogen sulfide, which are inhalation hazards with their own controls. See related: The Crawlspace Entry Hazard Check SOP.
• Large backups and flooded structures that need a water restoration contractor. See related: Floodwater Exposure for Any Trade.
• Why sewage makes people sick and which organisms matter. See related: Sewage Exposure and the Hygiene That Prevents Illness.

Roles and responsibilities

The handoff that matters is the first one: a tech who washes up and keeps quiet about a splash has broken the chain.

Procedure

1. Cover every break in the skin before gloving. Check both hands and forearms for cuts, hangnails, cracked knuckles and scrapes, and cover each with a waterproof bandage before any glove goes on. Acceptance: every break on the hands and forearms is sealed under a waterproof dressing, and the dressing edges are flat with no lifted corner. What wrong looks like: a fresh, weeping or deep wound on the hand that a bandage will not seal, or a dressing that lifts when you flex your fingers. Stop rule: that tech does not do the contact portion of the job; another tech does it, or the job is rescheduled. Hazard at this step: broken skin is the one route a glove failure turns straight into an infection, so this check happens before the job, not after.

2. Put on the full kit in order. Nitrile inner gloves, then heavy rubber or neoprene outer gloves long enough to reach mid-forearm, splash goggles or a face shield over safety glasses, waterproof boots with pant legs worn over the boot tops, and a liquid-resistant apron or coveralls, which is the kit the shop's PPE hazard assessment under 29 CFR 1910.132 should name for sewage work. Acceptance: outer glove cuffs sit over the sleeves, no skin shows between glove and sleeve when the arms are raised, and both gloves pass a visual and a squeeze check for holes. What wrong looks like: a pinhole, a cracked cuff, or a glove that leaves the wrist bare. Stop rule: replace the glove from the truck spare; if there is no spare, the contact work does not start until one is fetched. Hazard: a face left uncovered for a "quick" auger run is how splash reaches the eyes, so eye protection goes on even for a toilet pull.

3. Set a clean zone and a dirty zone before opening anything. Lay a drop cloth or tarp at the work area as the dirty zone and pick a clean spot near the exit for a sealed bag, the phone, keys and tablet. Acceptance: nothing in the clean zone is touched with an outer glove for the rest of the job, and the phone stays in a zip bag or in the clean zone. What wrong looks like: a tablet signature taken with a gloved hand, or a phone set on the dirty tarp. Stop rule: that item goes through step 6 decontamination before it goes back in the truck. Hazard: sewage on a basement floor near receptacles, a water heater or a sump pump control can energize the water; do not stand in water near energized equipment, and have the circuit opened at the panel by a qualified person, proved dead on a known live source before and after per NFPA 70E-2021, 120.5, before anyone works in that water.

4. Work without touching your face. Keep both hands below the shoulders while gloved. When you need to wipe sweat, fix glasses or scratch, step out of the dirty zone, remove the outer gloves first and use a clean towel. Acceptance: zero hand-to-face or forearm-to-face contact during the job. What wrong looks like: a glove or sleeve brushing the mouth, nose or eyes, which is a skin contact and fails the step. Stop rule: stop, wash the face with soap and water, and report it under step 5. Hazard: a drain jetter, a spinning cable pulled back through standing water, or rinsing a floor with a pressure washer throws a fine aerosol; point the nozzle away from the face, keep the face shield down, and where the work will throw mist for more than a few minutes, wear an N95 under the shop's written respiratory program per 29 CFR 1910.134 or change the method.

5. Respond to any splash or skin contact immediately. Eyes: flush with clean running or bottled water for 15 minutes, holding the lids open. Mouth: rinse and spit, do not swallow. Skin, and especially a cut: wash with soap and running water for at least 20 seconds and re-dress the cut with a fresh waterproof bandage. Acceptance: the flush or wash is done before the job resumes, and the office has the report before the tech leaves the site. What wrong looks like: a tech who finishes the job first and washes later, or who decides the splash was too small to mention. Stop rule: if the contact was to an open wound, the eyes or the mouth, the owner decides on a same-day medical visit; the clinician, not the shop, decides on a tetanus booster or other treatment. Hazard: if eye irritation, vomiting, diarrhea or fever starts in the days after, the tech gets medical care and tells the clinician about the sewage exposure.

6. Decontaminate tools before they leave the site. Scrape off solids, wash with detergent and water, then disinfect with an EPA-registered disinfectant at its label dilution or with the CDC flood-cleanup mix of 1 cup of household bleach to 5 gallons of water, and keep the surface wet for the contact time on the label. Acceptance: no visible soil on any tool, and the disinfectant stayed wet for the full label contact time. What wrong looks like: a cable coiled back into the machine still dripping, or a porous wooden handle that has soaked up sewage. Stop rule: anything that cannot be cleaned goes into a sealed bag marked dirty for shop cleaning or disposal. Hazard: never mix bleach with ammonia or acid cleaners, which releases toxic gas; mix outdoors or with ventilation and keep the goggles on, because the splash risk now includes bleach.

7. Take the gear off in the order that keeps your hands clean. Wash the outer gloves while still wearing them, then remove the coveralls or apron by rolling them inside out, rinse the boots, remove eye protection by the strap, and peel the inner gloves off last without touching their outside. Acceptance: hands washed with soap and running water for at least 20 seconds after the inner gloves come off. What wrong looks like: no running water on site. Stop rule: use wipes to remove visible soil, then alcohol hand sanitizer, and wash with soap and water at the first sink; sanitizer is weak against soiled hands and against some of the viruses sewage carries, so it is a bridge, not a finish. Hazard: most self-contamination happens here, when a dirty glove touches a clean wrist.

8. Wash before anything goes near your mouth. No eating, drinking, smoking, vaping, gum or phone-to-face until hands have been washed with soap and running water after the job. Acceptance: a soap-and-water wash precedes the first food, drink or cigarette after the job. What wrong looks like: lunch in the truck after a bottled-water rinse. Stop rule: no sink, no lunch until there is one. Hazard: this is the main ingestion route, and the step skipped most on a long day.

9. Bag soiled clothing and keep it out of the house. Anything that touched sewage goes into a sealed bag before it enters the truck cab, is laundered separately in hot water, and is not carried into the tech's home with the family laundry. Acceptance: the bag is sealed before the cab door opens, and the tech showers at the end of the shift. What wrong looks like: wet coveralls thrown on the passenger seat. Stop rule: wipe and disinfect the seat and any door handle touched. Hazard: the exposure follows the clothing to children and anyone else at home who never chose it.

The record this produces

Each sewage job writes four fields to the job record in the field app: PPE worn (checked against step 2), whether any contact occurred (yes or no), what the contact was (eyes, mouth, intact skin, broken skin), and the time it was reported to the office. A yes creates an exposure log entry the owner reviews the same day, carrying the decision made and whether the tech went for medical care. The owner also keeps each tech's last tetanus booster date in the employee profile, because the decision in step 5 depends on it and nobody remembers it on the day. The log is read again when a tech falls ill, and at the quarterly review, where two contacts with the same cause point at a gear or method problem.

Worked pass

A two-hour main-line backup at a rental basement, one technician, Marco. The floor drain had overflowed across about a third of the basement floor.

• Step 1, pass. A small cut on the right index knuckle, covered with a waterproof bandage, edges flat when he made a fist.
• Step 2, pass. Nitrile inners, forearm-length rubber outers over the sleeves, goggles, boots with pants over, apron. Both outers passed the squeeze check.
• Step 3, pass. Tarp at the drain, bag and phone on the stairs. The water stopped well short of the water heater and every outlet, so no isolation was needed.
• Step 4, pass. He retrieved the cable through the cleanout with the face shield down and no face contact.
• Step 6, fail. Scraping the cable on the cleanout cap threads tore the right outer glove and split the nitrile under it. Sewage reached the back of his right hand and wet the knuckle bandage. That is skin contact, including a covered cut, so the step failed and he took the stop rule.
• Step 5, response. He stopped, removed both gloves, washed the hand with soap and running water at the laundry sink for 20 seconds, removed the soaked bandage, washed the cut and re-dressed it. He called the office at 10:40, before resuming.
• Owner decision. The profile showed his last tetanus booster 6 years earlier. CDC wound guidance uses 5 years as the line for a contaminated wound, so the owner sent him to urgent care that afternoon and let the clinician decide. The clinician gave a booster.
• Step 6 completed, steps 7 to 9 pass. Fresh gloves, cable disinfected with the bleach mix outdoors, gear removed in order, coveralls bagged before the cab, hands washed before lunch.

The quarterly review found a second torn glove on the same cleanout threads two months later, and the shop moved to a cut-resistant outer for cable work, a pattern only the record made visible.

References

• CDC, Guidance for Reducing Health Risks to Workers Handling Human Waste or Sewage
• CDC, flood cleanup guidance (bleach dilution for hard surfaces) and tetanus wound-management guidance
• 29 CFR 1910.132 (PPE hazard assessment, general industry) and 29 CFR 1910.134 (respiratory protection)
• See related: Sewage Exposure and the Hygiene That Prevents Illness
• See related: The Crawlspace Entry Hazard Check SOP