Thank you for writing to me as mentioned above. I would like to inform you that the appropriate government issued a notification in July 2016, extending the operation of the said Act to all areas of certain districts of Maharashtra where the scheme was previously implemented, effective from 01/08/2016. If the area in which your unit is located falls within any of the districts mentioned in the notification and employs the minimum number of persons required by the Act, then in my opinion, your unit is covered or can be covered under the ESI Act, 1948, as well as the rules and regulations framed thereunder. You can verify this information from the nearest ESIC Office or from the Sub-Regional Office, ESIC, Pune.
Furthermore, some experts and seniors who contribute to HRcite, such as Sh. Korgaonkar ji and Kulkarni ji, are, I believe, based in Maharashtra. You may seek their opinion if desired. Both of these seniors have expressed their views in this thread as well.
Kind regards