Remediation Service
Post-Flood Mold Remediation on Long Island
Category 3 water protocol — Sandy legacy cleanup, storm floods, basement nor'easter events. Insurance-documented from day one.
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Overview
Post-Flood Mold Remediation: what we actually do.
Post-flood remediation is a different beast. Category 3 water (groundwater, sewage, storm surge) carries bacteria and contaminants beyond just mold. The protocol is stricter, faster, and more expensive. We've been the go-to for South Shore Sandy-legacy work since 2013. Recent nor'easters (Dec 2023, Jan 2026) have kept this service our #2 volume job.
When to call us
- Basement or ground-floor flooding from a storm event
- Sandy-era residual mold found during a renovation or sale inspection
- Sump pump failure with resulting flood
- Sewer backup into the home
- Roof collapse or significant water intrusion from above
Our process
Emergency mobilization
Same-day or 24-hour response. We work with water-extraction contractors on the wet pull-out, then take over for dry-out and remediation.
Cat 3 containment
Full containment separating wet zone from dry zone. Antimicrobial applied immediately to all wet surfaces before any demolition.
Demolition
All porous materials below the flood line are removed. Drywall, insulation, carpet, cabinets, baseboards. Structural wood is HEPA-sanded and treated, not replaced — unless rotten.
Structural drying
Commercial dehumidifiers + air movers for 5–7 days. Daily psychrometric readings target wood MC below 12%, RH below 40%.
Third-party PRV
For insurance-heavy claims, we typically bring in an independent clearance firm — it strengthens the claim file and removes any conflict-of-interest appearance.
The real causes we see in Long Island homes
Nor'easter ground water
January and March nor'easters push water into South Shore basements every few years. We're the Sandy-legacy remediator most adjusters in Nassau and Suffolk know by name.
Sump pump failure + power outage
A common pairing during storm events. Power goes out, sump stops, basement takes on water. Battery-backup sumps prevent this.
Sewer backup
Combined stormwater systems in older Nassau villages can back up under heavy rain. Cat 3 cleanup is mandatory — this is sewage contamination.
Pricing
Most basement flood jobs run $5,000–$12,000. Whole-house or multi-story events can reach $25,000+. Often insurance-paid via flood rider (NFIP) or sewer-backup rider.
Every quote is fixed after inspection — no hourly billing, no change orders unless the substrate reveals hidden contamination.See full pricing guide →
FAQ
Questions homeowners ask about post-flood mold
More services
Related work we do.
Mold Remediation
Full IICRC S520 remediation — containment, HEPA filtration, removal, and clearance. Our core service.
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Black Mold Removal
Emergency Stachybotrys removal with negative-air containment, respirator-grade crew, and PRV clearance testing.
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Attic Mold Removal
The #1 mold problem in Long Island homes — sheathing mold from blocked bath fans and under-vented roofs. We treat the wood and fix the ventilation.
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Basement Mold Removal
From crawl-space dampness to finished-basement flood damage. South Shore specialty — Sandy legacy and nor'easter water events.
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Crawl Space Mold Remediation
Vapor barriers, joist treatment, dehumidification — the three-step fix for chronic crawl-space mold in older LI homes.
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Bathroom Mold Removal
Hidden behind tile, under vanities, and inside wall cavities — most bathroom mold comes from pinhole leaks that have been wet for years.
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Ready to breathe easier?
Same-week scheduling. Crew on-site in days, not weeks.
Free visual inspection, same-day estimate. Licensed assessor handles the test separately from remediation — NY Article 32 compliant from the first call.
Mon–Sun 7am–8pm · 24/7 emergency line