Alameda County · San Francisco Bay Area
Mold testing in Berkeley, CA
Mold testing in Berkeley starts at $395 and includes the local visit, accredited laboratory analysis and a written result within 24 hours. Mold testing measures what is actually airborne and on surfaces: a sampler pulls a calibrated spore-trap air cassette indoors and one outdoors as a control, adds tape-lift samples from suspect growth, and the laboratory reports spore counts by genus so elevated indoor levels can be proven or ruled out.
Instant price check
What testing costs in Berkeley
What do you need tested?
Testing only. We report what the accredited lab finds and never bid the removal or remediation work.
Accredited lab
Third-party analysis
Testing only
No removal sales, ever
Same-day visits
Fast written results
Chain of custody
Tracked from start to finish
Short answer
What does mold testing in Berkeley involve?
Mold testing measures what is actually airborne and on surfaces: a sampler pulls a calibrated spore-trap air cassette indoors and one outdoors as a control, adds tape-lift samples from suspect growth, and the laboratory reports spore counts by genus so elevated indoor levels can be proven or ruled out.
- Collection inside Berkeley on our San Francisco Bay Area routes, usually same-day or next-morning.
- Independent accredited laboratory analysis: Spore-trap air cassettes and tape-lift or bulk surface samples, analysed by direct microscopy with genus-level spore counts and an indoor-versus-outdoor comparison.
- Written result you can hand to a contractor, landlord, insurer or permit counter.
- Starting price $395 with the laboratory fee already included.
Why Berkeley properties come to us for mold testing
Oakland, Berkeley and Alameda hold block after block of pre-1940 stock with plaster walls and lead-painted trim, while Hayward, San Leandro, Fremont, Dublin, Pleasanton and Livermore filled in between 1950 and 1978 with textured-ceiling tract housing.
Bay-influenced humidity, winter rain and slab-on-grade crawl spaces keep moisture in wall cavities long after a leak looks dry.
What we sample in Berkeley
- Indoor spore-trap air cassettes room by room
- An outdoor control cassette taken the same hour
- Tape-lift samples from visible growth on drywall, trim or tile grout
- Bulk samples of wet insulation, carpet pad or subfloor
- Cavity air behind suspect walls where a moisture meter reads high
- Moisture and relative-humidity readings that explain the counts
Local work driving requests in Alameda County
- Kitchen and bath gut jobs in pre-war Oakland and Berkeley flats
- Popcorn ceiling scrapes across Hayward, San Lorenzo and Castro Valley tracts
- ADU and garage conversions in Ashland, Cherryland and Fairview
- Rental make-readies along the Mission and Foothill corridors
- Tri-Valley additions in Dublin, Pleasanton and Livermore
When people call us
- A visible patch appeared after a roof, window or plumbing leak
- A musty smell persists after the area looks dry
- A tenant, buyer or insurer asked for documentation
- Allergy or asthma symptoms track with time spent in one room
- A remediation contractor wants post-work clearance proof
What the written report contains
- Spore counts by genus for every indoor sample
- Outdoor control comparison so indoor elevation is provable
- Moisture and humidity readings per sampled room
- Laboratory accreditation, analyst signature and chain of custody
Applicable oversight in Berkeley: Bay Area Air Quality Management District (BAAQMD) Regulation 11 Rule 2, Alameda County Healthy Homes and Cal/OSHA. We report the laboratory numbers — your contractor or the agency decides what happens next.
Structured summary
Mold testing in Berkeley — the facts
| Service | Mold testing in Berkeley — sample collection, accredited laboratory analysis and a written result. We never sell removal or remediation work. |
|---|---|
| Starting price | $395, laboratory analysis included. Quoted before anyone is dispatched. |
| Laboratory method | Spore-trap air cassettes and tape-lift or bulk surface samples, analysed by direct microscopy with genus-level spore counts and an indoor-versus-outdoor comparison |
| Turnaround | Same-day or next-day collection, written laboratory spore count within 24–48 hours |
| Rating | 5.0 out of 5 from 76 verified customer reviews. |
| Contact | (510) 804-3839 · orders@clearguardenvironmental.com |
The steps
How a Berkeley sampling visit runs
01
Tell us what you're about to disturb
Call, text a photo, or fill out the form. We identify the suspect materials, estimate the sample count, and lock in your flat price before anyone is dispatched.
02
A certified inspector collects the samples safely
Each distinct material is wetted down, a coin-sized piece is cut, sealed, labeled and logged under chain of custody. The mark left behind is smaller than a light-switch plate, and the space is left clean.
03
An accredited lab runs the PLM analysis
Samples are examined by Polarized Light Microscopy with dispersion staining — the EPA-recognized method for bulk building materials — with point counting available for borderline results.
04
You get a written report within 24 hours
A PDF lists every sample location, the analytical method, the fiber type detected and the reported percentage.
Independence
A company should not test the material it hopes to remove.
We collect and test material. ClearGuard does not sell removal work, keeping the finding independent. An abatement crew offering a "free inspection" is running a sales call with a lab form attached. We only sell the test, so a clean result and a positive result pay us exactly the same.
- No removal bids, no upsell, no referral kickback
- Every sample goes to an independent, accredited laboratory
- You get material names and percentages, not a vague pass or fail
- If a result is positive, we point you to licensed local abatement crews and exit the job
FAQ
Mold testing questions from Berkeley
How much does mold testing cost in Berkeley?
Mold testing in Berkeley starts at $395, laboratory analysis included. The full price is quoted before anyone is dispatched, and the estimate depends on how many samples the scope needs.
How fast can you sample in Berkeley?
Berkeley sits inside our San Francisco Bay Area routes, so collection is usually same-day or next-morning and the written laboratory result follows within 24 hours.
Why does Berkeley housing need mold testing so often?
Oakland, Berkeley and Alameda hold block after block of pre-1940 stock with plaster walls and lead-painted trim, while Hayward, San Leandro, Fremont, Dublin, Pleasanton and Livermore filled in between 1950 and 1978 with textured-ceiling tract housing. Bay-influenced humidity, winter rain and slab-on-grade crawl spaces keep moisture in wall cavities long after a leak looks dry.
Do you handle cleanup or removal in Berkeley?
No. ClearGuard collects samples and reports independent laboratory results only. Because we never bid the removal or remediation work, the finding cannot be shaped by a sale.
How much does mold testing cost?
Mold testing starts at $395, which covers the visit, one indoor spore-trap sample, the outdoor control and the laboratory spore count. Additional rooms or surface samples are quoted before the visit.
Is a mold test worth it if I can already see the growth?
Yes, for two reasons: the lab identifies the genus, which changes how the cleanup is handled, and an air sample shows whether spores have spread beyond the visible patch into rooms that look clean.
Do you do mold remediation too?
No. We test and report only. A remediation company will read our numbers, but it will never be us selling you the cleanup.