MILFORD >> State and federal authorities will hold two public open houses where residents can see revised flood insurance rate maps.

On May 16, the maps will become effective in 20 communities in the Quinnipiac River watershed, including Milford, Orange and Woodbridge.

The meetings will be held by the Federal Emergency Management Agency Region I Boston office and the state Department of Energy and Environmental Protection.

Representatives of those agencies will be available to answer questions on flood risk and flood insurance.

Residents may bring their elevation certificates and/or flood insurance policies to the events in order to get the best information about how their flood insurance rates may be changing as a result of the revised maps and recent flood insurance program changes.

The meetings will be held 4-7 p.m. March 27 at North Haven Town Hall, 18 Church St., second-floor conference room; and March 28 at the Bristol Main Library, 5 High St., meeting room 3.

For more information, visit the Planning and Zoning Department at www.ci.miilford.ct.us.

The other watershed communities are: Ansonia, Branford, Bristol, Cheshire, Derby, East Haven, Guilford, Hamden, Meriden, New Britain, New Haven, North Branford, North Haven, Prospect, Plainville, Southington and Wallingford. Guilford, New Haven and Prospect will have no changes to their flood maps. These three towns share a map panel with a community that will have map revisions.