Sewage cleanup in Dallas: Category 3 water, costs and first steps

These are national figures from HomeGuide's 2026 sewage cleanup cost guide. No public agency publishes Dallas-only prices. A real quote depends on how far the water spread, how long it sat, whether it reached a basement, crawl space or HVAC ducts, and how much drywall, insulation and flooring has to go.

HomeGuide notes that crawl space and basement jobs cost more because they need extra pumping equipment and safety measures, and that minimum job fees are typically $200 or more. If mold has already started, its guide adds $15 to $30 per square foot for mold removal.

The water damage industry's reference document is the ANSI/IICRC S500 Standard for Professional Water Damage Restoration, published by the IICRC; the current edition is the 5th, from 2021. It sorts water into three categories by contamination. As quoted in a February 2026 position statement by the S500 Consensus Body, the standard defines Category 3 water as grossly contaminated water that can contain pathogenic, toxigenic or other harmful agents and can cause significant adverse reactions to humans if contacted or consumed. Its examples include sewage and wasteline backflows that originate from beyond any trap, regardless of visible content or color.

That last point matters: a toilet overflow from the bowl and a backup that comes up from the drain line are not the same thing. Water that came from beyond the trap counts as Category 3 even if it looks clear.

The same statement quotes the S500 rule that for Category 2 or 3 water, remediation should happen before restorative drying, and restorers shall use contamination controls and appropriate worker protection. In other words, a contractor following the standard should not simply set up fans on sewage-soaked carpet. Expect containment, removal of contaminated porous materials, cleaning, then drying.

The S500 is an industry standard, not a Texas law, and Texas does not license water damage restoration as such. It is still a useful yardstick: ask any company you consider whether its scope of work follows the current S500 and how it determined the category of water.

1. Stop using water. Every flush or load of laundry adds to the backup.
2. Keep people and pets away. The American Red Cross warns that floodwater may contain sewage, and recommends boots, long pants, work gloves, eyewear and an N95 respirator during cleanup.
3. Be careful with electricity. Do not touch wet electrical equipment or stand in water near outlets.
4. Report a public sewer problem.Dallas Water Utilities lists a clogged or overflowing wastewater main among the emergencies it handles; call 311 inside Dallas city limits or 214-670-3111 from outside. Suburbs have their own utilities, so use the number on your bill.
5. Photograph everything before anything is thrown out, and tell your insurer. The Texas Department of Insurance says not to throw anything away until the adjuster tells you.

The EPA advises calling in a professional with experience cleaning buildings damaged by contaminated water rather than treating sewage like an ordinary leak. Our emergency checklist covers the broader first steps.

Cleanup and the plumbing repair are different jobs. In Texas, plumbing is licensed by the Texas State Board of Plumbing Examiners. Search the plumber in the state plumbing license search before work on a drain or sewer line starts. If a city main caused the backup, the utility, not your plumber, deals with the main. The S500 itself places the responsibility for finding and correcting the source of the water on the property owner, not the restorer.

• Ask how they will classify the water and what they will remove versus clean. Get it in writing.
• Ask whether they will use containment and protective equipment, as the S500 expects for Category 3.
• If mold has spread over a large area, Texas generally requires TDLR-licensed mold professionals; see our mold remediation page.
• Get several written bids. Texas Department of Insurance guidance says it is illegal for a contractor to offer to waive your deductible.
• Do not pay in full up front, and hold final payment until the work is complete.

For background on the three water categories, see our guide to clean, grey and black water. We are an independent guide and do not do cleanup work. You can describe your situation through our contact page.