Independent Mold Testing · Northern California

Know what's in your air. Get answers, not guesswork.

Lab-verified mold inspection and air-quality testing across Northern California. Moisture mapping and third-party lab analysis — so you know what's actually there before anyone touches anything.

Call (707) 273-8171 Book Free Consultation

5.0/5 on Google 11 verified reviews

"Patrick was so great! He came and spent an hour going through our home and assessing our mold situation. He was super patient in answering all our questions."

Taylor Shomaker · Google review

Verified Reviews

Real homeowners. Verified outcomes.

5.0 out of 5 stars from 11 Google reviews. Here's what families say after their inspection.

“Quality work. My home is a much better place now. The owner is very easy to work with. I would absolutely recommend this company. Two thumbs up 👍”

Mike Turner

Google review

Verified

“Ron was more than thorough in his inspection & gave us a quote that was adequate for the scope of work. So glad we went with his company vs the others.”

M G

Google review

Verified

“They did a wonderful job! Treated my home like it was their own. My house was full of mold it's all gone now I am forever grateful. Super nice crew family run business. Recommend them to anyone with a mold problem”

Emily Moore

Google review

Verified

“It really works! After my kids left the house, I kept our back two bedrooms closed off to save on heating costs. Both rooms are carpeted and after a couple years they took on a very dank smell. After the treatment the smell was completely gone and the air feels clean. I was initially concerned about what the process would do to my house plants (have many) and not even a brown spot occurred. The team was polite and professional and I will definitely have this done again.”

Andy Lauermann

Google review

Verified

“We got our house done and all I can say is that this really works, not only organic, but no chemical smell not stains especially with the weather we get here, haven't seen a spot a Spot of mold since. Thank u for ur work.”

Jose Mendoza

Google review

Verified

Why North State Pure Maintenance

Why people choose North State Pure Maintenance.

Independent inspections, lab-grade testing, and plain-language reports. We don't sell remediation you don't need — and when treatment is required, you decide with the data in hand.

Independent lab partner

Samples processed by an accredited third-party lab so the report stands on its own — no in-house conflict of interest.

Full property diagnostics

Humidity, moisture content, behavioral contribution — we map why a problem exists, not just whether it's there.

Plain-language reports

Spore counts, species, comparisons, and recommendations — written so you can act on them without a PhD.

No upsell pressure

If you don't have a mold problem, we'll tell you. Real homeowners say it best — see our verified Google reviews.

20+ years of combined experience

Serving Northern California — homes, rentals, and commercial properties alike.

Mold Testing & Inspections

No More Guesswork.

Ascertain if your home or workplace has a mold problem, how bad the problem is, why the problem exists, what its cause(s) are and what can be done. We do this in two ways as part of our mold inspection and testing service.

Specialist mold testing

We have several options when it comes to mold testing. We can discuss which would be most appropriate for your situation if you give us a call or fill out our contact form.

Expert Home Inspection

Our expert technicians will use their suite of specialist diagnostic tools along with their expertise to identify problem areas, likely cause(s) and effective solutions.

Call (707) 273-8171 Book Free Consultation

North State Pure Maintenance technician conducting a full property mold inspection

Expert diagnostics

Expert Diagnostics

Full property inspection.

Our expert technicians use a suite of professional diagnostic tools — hygrometers, moisture meters, and infrared cameras — across the attic, living space, crawlspace, and HVAC system, combined with their knowledge, to offer insights as unique as the conditions in your home. In the damp coastal and mountain climates of far-northern California, crawl space moisture is one of the most common root causes we find.

The aim of the inspection is to form a picture of why a mold problem exists and, crucially, what can be done about it.

Behavioral contribution & occupancy patterns
Relative humidity mapping room-by-room
Moisture content of surfaces & substrates
Third-party lab air, tape & culturable sample analysis to identify mold species present

A visual inspection tells us where moisture is accumulating and where conditions could support mold growth right now — it's a snapshot of the property on the day we're there, not a guarantee about what's happening inside every wall cavity. That's why we pair it with lab-based testing whenever the situation calls for it: together, the two give you the fullest picture available before you decide on next steps.

Our Approach

Testing options. Tailored to your situation.

The type of test you need may differ depending on your circumstances and desired outcomes. Call us for clarification — we'll help you pick what fits.

Air-O-Cell flow indicator device used for non-viable mold spore sampling

Non-viable testing

Air samples are analyzed for both alive (viable) and dead (non-viable) mold spores. The lab records spore count per cubic meter alongside the species present.

A calibrated pump pulls a measured air sample — typically around 75 liters — through a filter cassette, capturing whatever spores are airborne at that moment. We usually take a matching outdoor sample too, so indoor readings can be read against a local baseline rather than in isolation.

Living mold spores cultured on a Petri dish in an independent laboratory

Viable testing

We capture mold spores in a mold trap. Captured spores are then cultured on a Petri dish. Any living (viable) spores reproduce, and the species are identified and recorded.

Because only living spores grow, this method is useful for confirming which species are actively viable in a space at the time of sampling — though culturing takes longer to return results than a direct air sample.

Lab technician analyzing a surface tape sample for mold genus

Surface & tape testing

Dust and surface samples are collected from suspected areas and analyzed by an independent laboratory for spore count and genus identification.

This is usually the fastest, most affordable option when growth is already visible — a technician lifts a sample directly from the surface. It's well suited to confirming genus and species, but on its own it won't tell you how far spores have spread through the air, which is why we often pair it with air sampling on larger jobs.

Independent lab analyst processing a North State Pure Maintenance air sample

Data-driven testing

Data-Driven Testing

Specialist mold testing.

Testing determines whether mold is present, how severe it is (spore count per m³), which mold strains are present, and how those readings compare against contextual baselines.

Results combine into a single report that gives you fact-based insight into the air quality in the home, the cleanliness of its airspaces, and whether any mold remediation is required.

Spore count per cubic meter, per zone
Genus & strain identification
Contextual comparison against outdoor & baseline samples
Plain-language report & clear next steps

Samples go to an accredited, independent laboratory rather than being read in-house, and results are typically back within a few business days of sampling. We treat the report as one input, not the whole answer: it's a point-in-time reading of what was in the air or on that surface, and it works best read alongside the visual inspection rather than in place of it. For decisions with real weight behind them — a real estate transaction, an insurance claim, sign-off after remediation — we'll walk through what the numbers do and don't tell you before you act on them.

North State Pure Maintenance technicians conducting a mold inspection, checking equipment, and documenting findings on-site

When To Test

When testing makes sense.

Not every situation needs a lab-grade test — sometimes a visual inspection and moisture reading tell us everything we need to know. Other situations benefit from the extra data a test provides:

Buying or selling a home: a pre-purchase test gives you documented, third-party findings to bring into the transaction, independent of either party's opinion.
After remediation: post-treatment clearance testing checks whether spore counts in the treated area have moved back in line with an outdoor baseline.
A musty smell with nothing visible: air sampling can help identify growth hidden behind walls, under flooring, or inside HVAC systems when there's an odor but no visible source.
Visible growth you want identified: tape or surface sampling can confirm the mold genus present, which helps scope an appropriate remediation plan.

Not sure which of these fits your situation? Call us and we'll talk it through before recommending anything.

Schedule Your Free Consultation

Wondering if you have a mold problem? Start with a free consultation.

Speak with a North State Pure Maintenance specialist to understand your situation and the right next step. No obligation, no pressure — just clear guidance and a written report.

Book Free Consultation Call (707) 273-8171

Or call us directly (707) 273-8171

Where We Work

Northern California specialists. Same-week appointments.

We serve homeowners and property managers across Northern California.

North Coast

Del Norte County · Humboldt County

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Shasta Cascade

Siskiyou County · Shasta County · Trinity County

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Valley & Northeast

Tehama County · Lassen County · Modoc County

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Service coverage

Northern California — eight far-northern counties