Under the recent round of UCMR3 testing, many water systems nationwide tested for chlorate ion. Contact your public water system to learn more about chlorate testing and results. If your water system observed chlorate in this testing, it will publish the results in its next annual consumer confidence report, which is publicly available. The report is often available on the internet, but you can also contact your water provider to request a copy. You can usually find contact information for your public water system on your water bill.