Caltest Analytical Laboratory

At a glance

What it is certified to test

6 of the 9 common well tests on the CA list (see which)

Price

from $61 (Package #1 Total Coliform and E.Coli (Present/Absent)), as printed on the lab’s website, read 14 Nov 2026

Turnaround

“Package #1: 5-7 day turnaround time. Packages and individual analyses: Turnaround time: 3 weeks from the day of receipt” (lab’s website)

Homeowner samples

yes (California list)

Lab facts

Listed by

California (California State Water Resources Control Board - Environmental Laboratory Accreditation Program (ELAP))

Address

1885 North Kelly Road, Napa, CA 94558 · Open in Google Maps

Phone

(707) 258-4000

Website

caltestlabs.com

Not on the state list: found and checked by us, 14 Nov 2026

Public / homeowner samples

Public samples: yes (per state)

CA ELAP lab type 'Commercial': accepts commercial samples per state list (broader than homeowner); call first

Certification record

Certificate ID

CA ELAP 1664

Issued by

California State Water Resources Control Board - Environmental Laboratory Accreditation Program (ELAP) (certification program)

Expiry on the list

11/30/2027 · expires in about 12 months

List version

California ELAP - Accredited Laboratories (map layer) + per-lab Fields of Accreditation, version Map layer fetched 2026-11-15; scope PDF as of 8/11/2026

We fetched it

15 Nov 2026 (file SHA-256 cbc97398a144…) · open the state file

Tests on the state list

• Named on the official list The state list names this analyte (or a column for it) for this lab.
• Group-level certification Certified for a parent group (e.g. 'Inorganics') that includes this analyte. Confirm the specific test with the lab.
• Partial group certification The list marks the group as 'Partial'. Confirm this analyte with the lab.
• Subcontracted The lab sends this analyte to another accredited lab (MDH 'X*').

96 drinking-water analytes across 24 methods in ELAP Fields of Accreditation 101 Microbiology of Drinking Water, 102 Inorganic Chemistry of Drinking Water, 103 Toxic Chemical Elements of Drinking Water, 104 Volatile Organic Chemistry of Drinking Water. Scope PDF: https://www.waterboards.ca.gov/drinking_water/certlic/labs/documents/elap_certs/1062.pdf (as of 8/11/2026).

Also certified by other states

Same business (same street address and ZIP) on another state's official list. Each state certifies separately, so each listing keeps its own source.

• Oregon · 4036 · VOCs · Public samples: yes (per state)
  ORELAP laboratory search (ODIE): accredited for the Drinking Water matrix (search as fetched 2026-11-15 (live database, no list date))

Homeowner service and turnaround (lab’s own website)

• Takes homeowner samples: yes. The lab’s site says: “Home Owners Packages (non regulatory)” source
• Who collects: You collect the sample with the lab's bottles. source
• Turnaround (as printed): Package #1: 5-7 day turnaround time. Packages and individual analyses: Turnaround time: 3 weeks from the day of receipt source

From the lab’s own website, read 14 Nov 2026 and re-read by a second checker; next check due by 12 Feb 2027. Certification fields come from the state list only.

Prices the lab prints, compared

• Bacteria (coliform / E. coli) against other California labs: median $45 across 11 other labs that print a price on their own site; 10 of them charge less than $61.

Comparison uses the lowest single-test price this lab prints; panels and ranges are left out. For comparison only, not a quote.

Nearest labs that take homeowner samples

3 other certified labs that take homeowner samples are within 25 miles of this lab. Distances are straight-line from the address on the state list (approx. = ZIP-code centre). “Takes homeowner samples” comes from a state list column or the lab’s own website, as named.

Price and turnaround as printed on each lab’s own website and checked by a second reader; – = not published or not read yet.

Around this lab: Napa County, CA

• Private wells: about 17,102 people, 12% of Napa County’s 142,456 residents (USGS, 2015); rank 30 of 58 counties in California by people on wells.

• EPA radon zone (indoor air): Zone 3: low potential (average indoor radon may be less than 2 pCi/L). EPA says the zone map should not decide whether one home needs testing.
• Arsenic above 10 µg/L (USGS model): about 1,372 private-well users (95% range 957 to 1,880; 2010 base), rank 24 of 58 in the state. A screening estimate, not a measurement of any well.
• Older homes (Census ACS 2020–2024): 57% of 55,817 housing units were built before 1980, about the same as the state share of 56%. Homes built before 1986 are more likely to have lead solder or fittings, so test tap water for lead there.
• PFAS in public water nearby (public supply, not your well): 6 public systems serving this county reported EPA UCMR 5 results; 0 had a PFOA or PFOS sample at or above 4.0 ng/L.

County figures describe where the lab is, not the lab. Sources: USGS 2015 water use and 2017 arsenic estimates, EPA radon zones, Census ACS table B25034 (2020–2024), EPA UCMR 5 (2023–2026); details and links on the sources page.

Before you send a sample

Call the lab to confirm it's currently certified for the exact test and method, that it accepts samples from homeowners, and how to collect and ship them. Bacteria samples have short holding times. Status can change between list updates. To check a status, contact the California certification program.

Is this your lab?

Labs can ask for corrections through the agency that publishes their state list. Homeowner service, prices and turnaround above come only from the lab’s own website. To ask us to correct or remove this listing, write to us (how we handle listings).