Major libraries, including Legal Deposit Libraries, where published maps are held include:ĭigitised copies of many Ordnance Survey maps are available on several websites including: You can find contact details for archives elsewhere using Find an archive. Ordnance Survey maps held elsewhere and published onlineįor published Ordnance Survey maps you should head elsewhere before searching at The National Archives as our collection is not comprehensive and you are less likely to find a published map here than online or at libraries and other archives, including local archives. Please contact us directly if you would like a copy.2. We share our geocoded leaks data under a Creative Commons license. More information on the LAUF data and emissions estimates can be found on the LAUF Calculator page. These are underestimates due to only including reported leaks, and that the state is using an older conservative method of estimating the rates at which methane emits from leaking pipes. We used the same data and methods from utilities’ estimations, but with municipality-specific data (from the geocoded leaks dataset) substituted for statewide data where applicable. HEET is working to improve utility adoption of the leak extent method to better identify SEIs in the field.Įstimated methane emissions from gas leaks are now calculated and included in the tables below.ĭue to the LAUF (Lost And Unaccounted For) gas regulations enacted in 2019, utilities were required to submit standardized estimates of their annual statewide methane emissions from leaks to the DPU. They are required to be repaired in 1-3 years. They are approximately the largest 7% yet contribute approximately 50% of all leak emissions.
You can learn more about HEET’s mapping process here.Google Maps places map pins on buildings – the leaks are on public streets, not inside buildings.Independent researchers typically find 1.5 to 3 times as many leaks as utilities report.
Any one leak could have been repaired since or new ones developed.The maps are snapshots in time as of the last day covered by the report, December 31 of each year.
Use these maps to zoom in on your home, school, or business to find local gas leaks. HEET uses the reports to create the maps and information below. Every year, Massachusetts gas distribution utilities are required to report the location of gas leaks and leaks that were repaired in their territories to the Department of Public Utilities.