If you're in the US I'd start with https://www.epa.gov/dwlabcert/contact-information-certification-programs-and-certified-laboratories-drinking-water https://ww

If you're in the US I'd start with https://www.epa.gov/dwlabcert/contact-information-certification-programs-and-certified-laboratories-drinking-water https://www.epa.gov/dwlabcert/contact-information-certificat... Clicking on my state brought me to my state's Department of Health website, whose Public Health Laboratory offers a send-in water lead test for $20.