Provider profile
FIRST ONSITE Property Restoration
Provider snapshot
What this listing says
Milwaukee-area property owners dealing with water or storm damage who want a single national restoration company to handle mitigation through full reconstruction under one contract.
Best for
- Milwaukee homeowners needing water damage mitigation and full reconstruction handled by one company, especially after flooding or pipe bursts.
- Commercial property managers and multifamily owners who want a restoration partner with national resources and pre-loss planning programs.
- Insurance-referred jobs where the carrier has an existing relationship with First Onsite and coordinates the claim directly.
- Large or complex losses where the scale of damage exceeds what a smaller local company can handle, such as multi-unit buildings or institutional properties.
- Property owners in Franklin, Greendale, Oak Creek, New Berlin, Brookfield, and surrounding communities within the greater Milwaukee area.
About this company
FIRST ONSITE is a national restoration company with a local office in Milwaukee at 1930 S 4th Street. Mold remediation is one piece of a much larger operation that covers water damage, fire and smoke restoration, reconstruction, asbestos abatement, and contents restoration. They serve both residential homeowners and commercial clients across industries including healthcare, education, hospitality, and multifamily housing. Insurance referrals drive a significant share of their work.
The Milwaukee office operates as a branch of a company with 110-plus locations across the US and Canada. Their website describes containment with plastic sheeting, negative air pressure, HEPA and charcoal filtration, hydroxyl units, dehumidification, and moisture mapping as part of their process. Their technicians hold IICRC certifications including water restoration technician credentials. The mold remediation page describes a five-step process: eliminate the moisture source, contain the affected area, remove mold growth, disinfect, and repair damage.
First Onsite traces its roots to Interstate Restoration, founded in San Antonio in 1998. The company grew through acquisitions and became part of FirstService Corporation, a Canadian property services firm, in 2019. The Milwaukee office is managed by Kevin DeNicola, who responds personally to some Google reviews.
The 4.4-star rating across 72 Google reviews reflects a split: the majority of reviewers are enthusiastic, but a cluster of 1-star reviews from late 2025 and early 2026 raises questions about consistency, particularly on smaller residential jobs.
Services
Service area
Headquartered at 1930 S 4th Street in Milwaukee, Wisconsin. The office lists service to Franklin, Greendale, Oak Creek, New Berlin, Brookfield, Bayshore, Bayside, Madison, Delafield, and Grafton. As a national company with 110-plus locations, they claim coverage across all 50 states and Canada, but the Milwaukee office is the local operation for southeastern Wisconsin.
Review consensus
Esmeralda stands out as the most consistently praised employee, named in at least eight reviews spanning 2022 through 2026. Reviewers describe her cleaning crews as efficient, kind, and fast, with one homeowner noting a full house cleanup in 10 days after a fire. Sergio Amaya draws strong praise from multiple 2025-2026 reviewers for communication and project management on water damage rebuilds. Todd, JJ, Gus Mosby, and Jennilee are also named repeatedly for responsiveness and follow-through. Several reviewers mention daily field reports as a standout feature. Insurance coordination is a common theme, with multiple reviewers saying First Onsite handled the claim process directly.
5 found across 72 total reviews at 4.4★. Carol I. described a seven-month ordeal over a countertop replacement where Sergio, her project manager, failed to communicate, blamed others, and hired contractors who needed eight measurements and three installs. A pipe broken by their subcontractor on a Friday was not fixed over the weekend. Lawrence S. said mitigation went fine but the rebuild phase brought scheduling chaos, threatening collection letters while insurance funds were pending, and staple damage to hardwood floors that remained uncompensated after 10 months. Julie G. said they damaged her home and never offered a resolution plan. Kevin DeNicola, the general manager, responded personally to that review acknowledging the stress and committing to direct involvement. Brandon R. recommended competitors Paul Davis and Sid Grinker instead, and Tim W. left a wordless 1-star. The owner used an identical template response for both Tim W. and Brandon R., saying they could not find either name in their system.
The negative reviews cluster around the reconstruction and follow-through phases, not the initial emergency response. Reviewers who needed fast mitigation, water extraction, or cleanup praise the company. Those who stayed through a longer rebuild project are where complaints emerge, particularly around communication, subcontractor quality, and damage resolution. The owner response pattern is mixed: Kevin DeNicola engages personally on some complaints but uses an identical template on others that says the reviewer's name cannot be found in their system. Two of five negative reviewers got that template, which reads more like reputation management than problem-solving.
Esmeralda (cleaning supervisor -- strongly positive across many reviews). Sergio Amaya (project manager -- polarizing; praised by many for communication, criticized sharply in one detailed 1-star review). Todd (field operations -- positive). JJ (field technician -- positive). Gus Mosby (project manager -- positive). Jorge (technician -- positive). Jennilee (intake/coordination -- positive). Megan (coordination -- positive). Kevin DeNicola (general manager -- responds to reviews, mixed engagement quality). Julie (phone intake -- positive). Rick (unnamed role -- positive). Rizo (crew lead -- positive). Mike (field tech/evaluator -- positive). Eric Vogel (business development -- positive, multiple referral-source reviews). Brian (technician -- positive). David (technician -- positive). Joe C. (project manager -- positive). John S. (construction crew -- positive). Jose V (cleaning -- positive). Stanley, Junior, Val, Jodniel (Esmeralda's crew -- positive). Juan Jr (technician -- positive). Edwardo (technician -- positive).
First Onsite is a strong choice for emergency water extraction and initial mitigation in the Milwaukee area. If your project extends into a full rebuild, pin down your project manager assignment early and ask for Esmeralda's crew if cleaning is involved. Get a written timeline and escalation path before work begins, and keep your own documentation of any damage their crews cause to your property.
Keep in mind
- They do both testing and remediation, which is a conflict of interest. Consider hiring an independent mold assessor or industrial hygienist before they scope the remediation work.
- This is a national franchise-style operation, not a locally owned company. Your experience depends heavily on which project manager and crew you get assigned. The gap between five-star and one-star reviews here is wide.
- Multiple recent reviewers report unresolved damage claims and poor follow-through after the initial mitigation work is done. One reviewer waited 10-plus months for reimbursement for floor damage the crew caused.
- The administration office is closed evenings and weekends. Emergency calls route through a national call center, so your first contact may not be someone from the Milwaukee team.
- Several negative reviews mention communication breakdowns on smaller residential projects. Ask upfront whether your job size is a priority for their office.