FAQ Some of our Frequently Asked Questions Are Pur Mason jars and lids BPA and lead free? Yes, all of our jars and lids have gone through extensive testing and do not contain BPA and lead. Are your lids and bands interchangeable with other leading jar brands? Yes. Our threading on jars and lids is compatible with other well known brands on the market today. Are your jars safe for pressure canning? All Pur Mason jars are suitable for pressure canning. Please follow all USDA guidelines for pressure canning instructions. Please visit our “TIPS” tab for more information on pressure canning. Should I boil your lids before use? We do recommend boiling lids before use to ensure the best possible seal. Where can I purchase Pur Mason jars and lids? You can find us at your local Ace Hardware store. Where is Pur Mason located? Our headquarters is located in Broomfield, CO. We package and distribute out of Broomfield, CO. We have a second shipping facility located in Ontario, CA.