Frequently Asked Questions

No. DWLCA is a private, non-governmental certification board. It is not affiliated with the U.S. EPA, any state environmental or health department, or any laboratory. DWLCA certification does not replace state or EPA certification — it adds to it.

State and EPA programs set a legal minimum and typically audit a lab once every three years, focused on what happens inside the building. They generally don't audit how samples are collected in the field, don't send unannounced blind samples, and their public lists are often out of date. DWLCA certifies to a higher bar — an onsite audit every year, sample collection and custody included, blind proficiency samples, and a live registry — for labs that want to prove they exceed the minimum.

A Council with a Certification Committee, an Appeals Committee, and contracted assessors who are experienced drinking water laboratory professionals. Assessors may not audit a lab they've worked for, consulted for, or competed with in the prior five years. See Governance & Ethics.

No. DWLCA never analyzes samples for customers and never competes with the labs it certifies. It only evaluates laboratories.

Initial certification: $1,500 application fee plus $3,500 for the first year (includes the onsite audit and one method scope). Each additional scope is $500/yr. Renewal is $2,500/yr. Expedited review is $750. Assessor travel beyond 150 miles is billed at cost and quoted in advance. Full breakdowns on the Apply and Renew pages.

Typically 6–10 weeks from application to certificate: 10 business days for document review, then the audit is scheduled (usually within 4–6 weeks), then a decision within 15 business days of the audit. Expedited review compresses this to roughly 4–5 weeks.

An assessor spends one to two days in your lab. They watch your analysts run the methods you're certified for, review calibration and QC records, check sample receiving and storage, review training files, and trace at least three real customer samples from receipt to final report. You get a written report classifying any findings as Observation, Deficiency (30 days to fix), or Critical (immediate scope suspension until fixed).

DWLCA sends you samples with known values, at least twice a year, through your normal customer intake — you don't know which they are. If your result is outside acceptance limits, that scope is suspended until you investigate and pass a re-test. This is the single most honest measure of how your lab performs on an ordinary Tuesday.

No. DWLCA certification does not depend on holding a government certificate. What you must do is demonstrate proficiency using EPA-approved methods for every scope you request — an initial demonstration of capability per analyst, a passing DWLCA proficiency sample, and the method run successfully in front of our assessor. If you already hold state or EPA certification, tell us; it is noted on your record but does not replace the demonstration.

Yes. Certification is granted per scope (microbiology, inorganic chemistry, PFAS, etc.). The DWLCA seal may only appear on reports for certified scopes.

An optional scope for labs whose staff or contracted collectors (home inspectors, for example) gather samples in the field. It adds field observation of collectors to the annual audit and lets those collectors be listed as DWLCA-trained. Labs with a lot of inspector-collected samples find it removes the "who collected this?" question from every report.

Once certified, your seal is available at dwlca.com/seal/DWLCA-XXXXXXXX.svg. It contains your certificate number and a QR code that resolves to your live registry entry. If your status changes, the seal URL stops serving — so an out-of-date seal can never be displayed by accident.

You may appeal any finding or decision in writing within 30 days. The Appeals Committee — none of whom took part in the original decision — responds within 30 days. See Governance.

Type the 8-digit number from the report into the Verify page, or scan the QR code in the seal. Lookups are by certificate number only — deliberately, so a name that merely resembles a certified lab can't pass as one. You'll see the lab's name, status, certified scopes, and last audit date, live from our registry. If the number returns nothing, the lab is not certified — let us know.

That an impartial assessor was physically in that lab within the last 12 months, watched the methods being run, traced real samples end to end, and that the lab has passed its blind proficiency samples. It means the number on your report was produced by a process someone outside the lab has checked.

Either the lab has been suspended or revoked since the report was issued, or the seal is being used without authorization. Both are worth reporting. Use the Report a Concern form and include the certificate number and report date.

No — it means the test result is trustworthy. Whether the water is safe depends on what the result says. Compare your results against EPA Maximum Contaminant Levels and talk to a qualified professional about anything above them.

Yes. Anyone can. Complaints that raise a credible question about data quality or sample handling trigger an unscheduled audit. Your identity is not shared with the lab unless you agree.