How to Properly Clean Up Sewage (Safely) in Covina and Nearby Areas

A sewage backup is one of the most stressful (and hazardous) types of property damage. Unlike a clean water leak, sewage can contain bacteria, viruses, and other contaminants that can spread quickly through flooring, baseboards, drywall, and even your HVAC system. That’s why “proper” cleanup isn’t just mopping and spraying disinfectant—it’s a biohazard response that focuses on containment, safe removal, disinfection, and complete drying.

All & One Restoration and Construction provides sewage backup cleanup in Covina with 24/7 emergency service, IICRC-certified biohazard cleanup expertise, and free inspections/transparent estimates, serving communities across Los Angeles County, San Bernardino County, and North Orange County.

Below is a practical, safety-first guide to what proper sewage cleanup looks like—and when you should stop DIY and call a professional.

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1) Treat Sewage as a Biohazard First

If the water came from:

• a toilet overflow that contains waste,
• a sewer line backup,
• a drain line backup with dark/odorous water,
• or flooding that mixed with wastewater,

…assume it is contaminated and limit access. The main risk isn’t just the mess—it’s exposure and cross-contamination into clean areas of the home.

All & One Restoration specifically positions sewage backup cleanup as a biohazard service and highlights commercial-grade cleaning equipment and certified expertise for this type of situation.

Stop and call a pro immediately if:

• sewage touched carpet, padding, upholstery, or mattresses (porous items are hard to decontaminate),
• water reached drywall/baseboards,
• more than a very small area is affected,
• anyone in the home is immunocompromised, elderly, or very young.

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2) Shut Down the Source and Reduce Spread

Before cleanup begins, the priority is preventing more discharge and limiting spread.

Do:

• Stop using water in the home (don’t flush toilets, run sinks, showers, or laundry).
• If safe, shut off the main water supply if overflow is continuous.
• Turn off HVAC in affected areas so airflow doesn’t distribute contaminants.

If you’re in a multi-unit building or HOA setting, notify management right away so the source can be addressed. Sewage issues often involve shared plumbing lines.

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3) Use the Right PPE (and Don’t Cut Corners)

Proper sewage cleanup requires protective equipment that prevents splashes and contact with skin, eyes, and lungs.

Minimum PPE for any close contact:

• Waterproof gloves (ideally long-cuff)
• Boots you can disinfect (or disposable boot covers)
• Eye protection
• A well-fitting mask/respirator suitable for odors/aerosols (avoid relying on a loose cloth mask)
• Disposable coveralls (recommended)

If you don’t have PPE and the right disinfectants, it’s safer to avoid cleanup and arrange professional remediation.

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4) Contain the Area to Prevent Cross-Contamination

Containment is a major difference between “cleaning” and proper remediation.

Basic containment steps:

• Close doors to affected rooms.
• Lay plastic sheeting (if available) to create a pathway out and reduce tracking.
• Keep pets and children out of the area.
• Set up a “clean zone” outside the room for removing PPE and bagging waste.

Professional biohazard teams typically build containment strategies as part of the cleanup process, especially when multiple rooms are affected. All & One Restoration describes bio remediation as involving safe removal, neutralization, and containment of biological hazards.

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5) Remove Contaminated Water and Unsalvageable Materials

This is the part most DIY attempts underestimate: porous materials that absorbed sewage usually must be removed and disposed of.

Often unsalvageable:

• Carpet padding
• Soft carpet with heavy saturation
• Drywall (when sewage wicked upward)
• Insulation
• Particleboard cabinets/toe-kicks (if soaked)
• Baseboards (frequently)

All & One Restoration’s sewage cleanup service outline includes steps that can extend to damage repairs if walls, flooring, or cabinets were impacted, which is common after a backup.

For water removal, pros use extraction equipment designed for speed and volume—important because the longer sewage remains, the more contamination spreads.

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6) Clean and Disinfect the Right Way (Not Just “Spray and Wipe”)

After removal, proper cleanup typically involves:

1. Cleaning: physically removing residue/soil from surfaces (disinfectants work poorly if dirt remains).
2. Disinfection: applying an appropriate disinfectant with correct dwell/contact time (per label instructions).
3. Secondary antimicrobial steps: where appropriate, to reduce microbial growth risk.

Hard, non-porous surfaces (tile, sealed concrete, metal) can often be cleaned and disinfected successfully. Porous materials are far more complicated.

All & One Restoration highlights commercial-grade cleaning and IICRC-certified biohazard cleanup for sewage events, which reflects the higher standard required for sanitization and safety.

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7) Drying and Dehumidification Matter as Much as Disinfection

Even when everything “looks clean,” moisture left behind can create serious secondary damage—especially inside wall cavities and under flooring.

Professional remediation includes drying, dehumidification, and sanitization, followed by monitoring—steps All & One lists as part of their broader water damage restoration process.

If you attempt any limited cleanup, you still need to:

• Run dehumidification
• Increase airflow safely
• Monitor for lingering dampness, odors, or staining

A musty smell after a sewage event is a red flag that moisture and contamination may remain.

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8) Document the Damage (Especially for Insurance)

If you plan to file a claim:

• Take photos/videos before removal
• Keep notes on what happened (when, where, how)
• Save receipts for any emergency supplies

All & One Restoration notes that they’re insurance approved/preferred for water damage restoration and can support the process from inspection through restoration.

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When to Call a Professional Sewage Cleanup Team

Even if you’re capable with basic cleaning, it’s usually best to call a certified team when sewage is involved—especially if it touched porous materials or multiple rooms.

All & One Restoration and Construction offers 24/7 emergency sewage backup cleanup in Covina, with local crews (including Covina and La Puente), free inspections, and service coverage across Los Angeles County, San Bernardino County, and North Orange County.