At the time of the recording of the lien certificate in the registry of deeds as provided in this section, in all cases the treasurer shall file in the office of the district a true copy of the lien certificate and shall send by registered certified mail to each record holder of a mortgage on the real estate, to his the person's last known address, a true copy of the lien certificate.

The costs to be paid by the person assessed shall be $3 is $25 plus the recording fees and registered certified mail fees paid for sending the true copies of the lien certificate.

In the event that the assessment, interest and costs shall be are paid within 12 months after the filing of the lien certificate in the registry of deeds, the treasurer shall prepare and record a discharge of the mortgage in the same manner as is now provided for the discharge of real estate mortgages. All costs for preparation and recording of the discharge must be paid by the person assessed or the owner of the real estate.

Sec. 6. P&SL 1949, c. 211, §6, as amended by P&SL 1953, c. 92, §4, is further amended to read:

*Sec. 6. Sanitary provisions and penalty for violation. Any A person who violates the provisions of this section or sections 6- A and 6-B, or who shall place places or discharge any discharges offensive or injurious matter or material on or into the conduits, catch-basins or receptacles of said the district contrary to its regulations, or shall wilfully injure any injures a conduit, pipe, reservoir, flush tank, catch-basin, inlet, manhole, outlet, engine, pump or other property held, owned or used by said the district for the purposes of this act, shall be is liable to pay twice the amount of the damages to said the district, to be recovered in any a proper action; and such the person, on conviction of either of said the acts of willful injury aforesaid, shall must be punished by a fine not exceeding