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.

NYLMB Licensed

IICRC Certified

Same-week scheduling

Request Free Inspection (631) 625-8807

Free Inspection Request

Get a same-week callback.

NYLMB Licensed · MA00534 / MR00612

IICRC CMR & AMRT Certified

4.9★ · 187+ Google Reviews

EPA RRP Lead-Safe

Since 2012 · 2,800+ Homes

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

For Cat 1 (clean water) under an inch, yes — a wet vac and fans can work. For Cat 3 (any groundwater or sewage), no. Contamination plus moisture equals biohazard, and insurance requires documented professional handling.

Regular homeowners policies exclude flood. You need a separate flood policy (NFIP or private) for ground-water events. Sewer backup is a specific rider. Sudden plumbing failure (burst pipe) is covered by the main HO-3.

Drying alone is 5–7 days. Full remediation (demo, dry, treat, clear) is 7–14 days. Rebuild is separate and usually another 2–6 weeks depending on scope.

For basement-only floods, usually no. For main-floor or whole-house floods, yes — at least for the demolition and dry-out phase. Your insurance policy will typically cover ALE (additional living expense) during this period.

Most basement flood remediation runs $5,000–$12,000 depending on affected square footage and materials. Whole-house or multi-story events can reach $25,000+. The majority of flood jobs are covered by NFIP flood insurance or sewer-backup riders. We provide complete documentation for insurance filing.

No — mold colonizes wet materials within 24–48 hours. After a Cat 3 flood event (groundwater, sewage, storm surge), waiting is the worst decision. Immediate extraction, antimicrobial treatment, and structural drying must begin as soon as water recedes. Delays multiply remediation costs significantly.

Cat 1 is clean water (broken supply line). Cat 2 is gray water (dishwasher overflow, washing machine). Cat 3 is black water — groundwater, sewage, storm surge. Each level requires progressively stricter protocol. Cat 3 requires full removal of all porous materials below the flood line, antimicrobial treatment, and extended drying.

More services

Related work we do.

Mold Remediation

Full IICRC S520 remediation — containment, HEPA filtration, removal, and clearance. Our core service. Long Island's housing stock — 1950s–70s construction with limited vapor barriers, poor attic ventilation, and South Shore flood exposure — creates persistent mold conditions that require professional remediation, not surface cleaning. We follow Category 3 containment protocol on every job: negative-air machines with HEPA filtration, zipper-door decontamination chambers, full PPE, and independent post-remediation verification (PRV) clearance before we close out. South Shore towns like Freeport, Merrick, and Valley Stream carry elevated mold risk from storm surge flooding. Nassau County Health Dept guidelines for mold remediation in occupied buildings require written scope, proper containment, and clearance testing on jobs over 10 sqft — we document every step for insurance and compliance purposes. Most residential remediation projects in Nassau and Suffolk run $2,000–$8,000. Post-flood jobs in South Shore towns can run $3,000–$12,000 depending on scope.

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.

Get My Free Inspection (631) 625-8807

Mon–Sun 7am–8pm · 24/7 emergency line