Testing & Assessment
Mold Inspection & Testing in Fontana, CA
An assessment establishes whether mold is present, where it is growing, and how far it extends — before anyone quotes removal. A mold inspection locates moisture and growth that a room-level look would miss, reading wall cavities, subfloor, and the areas behind finished surfaces. The result is a scope: what is affected, what has to come out, and what is driving the moisture.
Most people reach this page after noticing something rather than after something broke: a smell that returns, a stain that spreads, a room that feels damp. An inspection answers what is actually there and where the moisture comes from, which is the information every later decision depends on. Several states, Texas among them, keep assessment and remediation as separate licensed roles specifically so the party identifying the problem is not the party selling the fix. Nothing here is medical advice — if you have health questions, those are for a clinician.
Every pro in our network is licensed and insured in California.
Frequently asked questions
San Bernardino is ten miles east. Why isn't Cajon Pass the tail here?
That city sits under Cajon and the Santa Ana wash. This city sits on the Fontana Fan, which is Lytle Creek and San Sevaine. February's number can look similar; the cobble is a different dump. A stain here traces to the fan or to Kaiser slag, not to Cajon Pass.
Ontario is the next fan city west. Same Cucamonga story?
Ontario sits on the Cucamonga and San Antonio fans. This fan is Lytle and San Sevaine, plus Kaiser fill. Same Inland Empire winter, different canyon mouths. Scoping them as one wash will miss the mill slag under the newer tracts.
The Kaiser mill is gone. Why is a 1989 slab still wet in February?
Slag does not leave with the company. It still perches water, and a tract pad poured on it is a lid on industrial ground. February rain that would have soaked alluvium sits in the slag instead. The mill is the floor. Newness is only the roof.