Rhode Island Department of Health
Rhode Island environmental lab certification, RIDOH and analytical labs.
Who certifies your lab in Rhode Island, which categories the rule covers, how out-of-state labs qualify, and what the rule says about calibrating your instruments.
At a glance
How environmental lab certification works in Rhode Island.
Rhode Island is not a NELAP state. The Rhode Island Department of Health certifies analytical laboratories under its own rule, Certifying Analytical Laboratories, which covers both drinking water and wastewater testing.
State program (non-NELAP)
- Agency
- Rhode Island Department of Health (RIDOH), which certifies labs to test drinking water and wastewater contaminants. Applications are returned to the Rhode Island Department of Health Laboratories.
- Rule
- 216-RICR-60-05-5, Certifying Analytical Laboratories, adopted under R.I. Gen. Laws § 23-16.2-5(a). The current version took effect January 4, 2022 as a periodic refile.
- Who needs it
- Certification for specific analytes and methods is required for laboratory testing of potable water, non-potable water, and environmental samples for lead content (216-RICR-60-05-5.4).
- Certificate categories
- Potable water and non-potable water, each with microbiology, organic chemistry and inorganic chemistry options; radiochemistry; environmental lead. Environmental lead certification requires A2LA or AIHA accreditation.
- Methods and quality control
- The rule incorporates 40 CFR Parts 136 and 141, the EPA Manual for the Certification of Laboratories Analyzing Drinking Water (Fifth Edition) and Standard Methods for the Examination of Water and Wastewater (18th through 22nd editions).
- Out-of-state labs
- RIDOH may certify a lab that is certified by EPA for the analytes and methods, or certified by its home state agency under requirements the Director finds equivalent, or NELAP accredited for analytes and methods its home state does not offer.
- NELAP status
- Not a NELAP accreditation body as of October 2026. The materials the rule incorporates are EPA and APHA documents; no TNI standard is listed.
The accreditation cycle
From application to renewal.
RIDOH certifies by analyte and method within each category. The cycle below summarizes 216-RICR-60-05-5; your certificate and RIDOH correspondence govern the specifics for your lab.
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Apply by category
Submit the RIDOH application with a fee for each category requested. A Rhode Island lab is not certified until it has been inspected, deficiencies are corrected and PT requirements are met.
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Proficiency testing
One acceptable PT result a year for each analyte and matrix by each method, from an accredited PT provider, with separate rules for lead, VOCs and microbiology (216-RICR-60-05-5.7.5).
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Inspections
After an inspection, RIDOH sends a written report of deficiencies within 60 days, and the lab returns a corrective action plan, with expected completion dates, within 30 days of receipt.
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Annual renewal
Certificates expire on December 30 of every year and are renewed annually (216-RICR-60-05-5.4.3).
Initial calibration
What auditors check in your initial calibrations.
Rhode Island does not adopt the TNI standard. Calibration expectations come from RIDOH’s rule, which ties instrument calibration to each method and to the lab’s quality assurance plan, and from the EPA methods and manuals the rule incorporates.
A range that brackets what you report
The lowest standard should sit at or below your reporting limit and the highest at or above the top concentration you report. Results outside the calibrated range need to be qualified.
Error at the low end, not r² alone
A correlation coefficient of 0.999 can still hide a low standard that back-calculates 30 percent off. Auditors look at relative error, especially at the lowest levels.
Records that rebuild the curve
Raw responses, the model and weighting used, any excluded points with the reason, and the verification that followed. An auditor should be able to reconstruct every initial calibration from the record.
Calibration at the intervals your methods require
216-RICR-60-05-5.8 requires equipment and instruments to be calibrated and checked for accuracy at regular intervals as required by the method and the laboratory’s quality assurance policies. The quality assurance plan must include instrument calibration procedures (5.7.1).
Source: 216-RICR-60-05-5.7 and 5.8
The same rule sets equipment checks an auditor can verify quickly: balances checked daily with ASTM Type I, Class 1 or 2 weights and calibrated annually by a professional balance service, and glass thermometers checked annually against a NIST traceable thermometer.
Self-check
Are your initial calibrations ready for a Rhode Island assessment?
Tick what your lab could show an auditor today. Nothing you select is saved or sent anywhere.
6Checks to work through
Select each item your lab could show an auditor today.
A self-assessment to help you prepare, not a compliance determination.
Rhode Island specifics
One agency, one rule, renewed every December.
Rhode Island keeps drinking water and wastewater certification in one place. RIDOH certifies fee-for-service water labs and municipal and industrial drinking water and wastewater labs under the same rule, with separate potable and non-potable water categories. RIDOH states that it is unlawful to test drinking water without certification.
Out-of-state labs qualify through their existing credentials. RIDOH’s application asks for the current certificate from the resident state, the most recent inspection report and the lab’s corrective action plan. Where the resident state does not certify an analyte, the rule accepts NELAP accreditation for it.
The rule itself has been stable. The current version of 216-RICR-60-05-5 has been in effect since January 4, 2022, a periodic refile that followed the April 30, 2019 amendment, and the state rule register showed no newer version as of October 2026. Its incorporated materials cite specific editions, including Standard Methods 18th through 22nd editions and a March 6, 2013 update to 40 CFR Part 136.
How WLTR helps
Calibration evidence ready for a Rhode Island inspection.
WLTR independently reviews the calibration your instrument software produced. Your analyst still makes the final call. What changes is that the evidence is complete, consistent across analysts, and ready before the auditor asks for it.
- Each analyte reviewed one at a time in the instrument software.
- The model and weighting are whatever the batch was processed with.
- r² is the number most people look at, even though it does not measure error at the low end.
- QA signs off without an independent check on the curve.
- Every analyte and every candidate model side by side in the Calibration Intelligence dashboard.
- Diagnostics run automatically and the best fit curve is identified, with the reasons recorded.
- Relative error at every level, including the lowest standard, shown on one screen.
- A traceable record your QA manager can review, sign and hand to a RIDOH auditor.
See how your own ICAL data looks when every analyte and model is laid out for review.
Questions
Rhode Island accreditation FAQs
Is Rhode Island a NELAP state?
No. The Rhode Island Department of Health is not a NELAP accreditation body. It certifies labs under its own rule, 216-RICR-60-05-5, and accepts NELAP accreditation from out-of-state labs only for analytes and methods their home state does not offer.
Who certifies drinking water and wastewater labs in Rhode Island?
The Rhode Island Department of Health, under 216-RICR-60-05-5. Drinking water falls under the potable water category and wastewater under the non-potable water category, each split into microbiology, organic chemistry and inorganic chemistry.
Can an out-of-state lab be certified in Rhode Island?
Yes. RIDOH may certify a lab that is certified by EPA for the analytes and methods it will perform, or by its home state agency under requirements the Director finds equivalent, or that is NELAP accredited for analytes and methods its home state does not offer.
How long does Rhode Island certification last?
Certificates expire on December 30 of every year and are renewed annually. Rhode Island labs must also analyze a PT sample annually for each analyte and matrix by each method; out-of-state labs follow their home state’s PT rules.
Does Rhode Island have its own calibration rule?
Yes, in general terms. 216-RICR-60-05-5.8 requires instruments to be calibrated and checked for accuracy at intervals set by the method and the lab’s quality assurance policies, and 5.7.1 requires instrument calibration procedures in the quality assurance plan.
Sources
Primary sources for this page.
- TNI, NELAP accreditation bodies (opens in a new tab)
- RIDOH, certified analytical laboratories (opens in a new tab)
- RI Secretary of State, 216-RICR-60-05-5 Certifying Analytical Laboratories (opens in a new tab)
- RIDOH, application for certification of analytical laboratories (opens in a new tab)
- 216-RICR-60-05-5.4, certification (Cornell LII copy) (opens in a new tab)
- 216-RICR-60-05-5.2, incorporated materials (Justia copy) (opens in a new tab)
- 216-RICR-60-05-5.7, quality assurance and proficiency testing (Justia copy) (opens in a new tab)
- 216-RICR-60-05-5.8, equipment and calibration (Justia copy) (opens in a new tab)
This page summarizes public program information to help labs prepare. Requirements change, and the agency’s current rules and guidance always take precedence. WLTR is not affiliated with or endorsed by the Rhode Island Department of Health. Spot something out of date? Tell us at admin@wltr.tech.
Before your next assessment
See your Rhode Island ICALs the way an auditor will.
Bring a recent initial calibration. We will walk you through every analyte and candidate model in the Calibration Intelligence dashboard, the best fit, and the record your QA manager would sign.
Request a demoHow the methodology works
Running environmental methods? See how WLTR works for environmental testing labs and water and wastewater utility labs.