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Techno Bits/Technical Bulletins WATER AND WASTEWATER - ARCHIVED Backflow Prevention Device Testing Massachusetts' facilities with backflow prevention devices providing protection of potable water supplies should confirm that all devices are permitted and tested annually by the water supplier. The DEP has eliminated the annual compliance assurance fee for backflow prevention devices, however local water suppliers may impose a charge for device testing. Additional testing requirements, including shifting the annual test responsibility to the owner may be imposed by the local water supplier.
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