R.I. Gen. Laws § 23-16.2-4.1
It shall be unlawful for any analytical laboratory to perform testing or analyses of samples originating in this state, for which the department of health requires certification, without having a certificate issued by the department of health pursuant to this chapter. Certificates for specific analyses and methods for laboratory testing of potable water, nonpotable water, and environmental samples for lead content are hereby required. The department is authorized to require certification for other types of environmental testing and to set fees for certificates in regulation. Certificates, unless sooner suspended or revoked under the provisions of this chapter, shall expire on the thirtieth (30th) day of December of every year following the date of the certificate.
R.I. Gen. Laws § 23-16.2-4.1