326 LAWS OF MARYLAND. [CH. 186

water pipe or sanitary sewer, and provided, further, that when
connected, the length of agricultural property to be assessed
shall be limited to 150 feet. The Commissioners shall change
the classification of properties from time to time, as said
properties change in the uses to which they are put. The
Commissioners shall be empowered and directed to make a
charge upon every building and place having a connection with
the sewerage system under their control, said charge to be an
annual sewerage service charge. All assessments and charges,
except connection charges shall be uniform for each
class of property throughout the District, shall be sub-
ject to change annually and shall be collected by the treas-
urer of Baltimore County, excepting the water service rates,
which shall be collected as already specified in Section 332.
For those water supply systems not falling under the provi-
sions of Sections 331 and 332 but constructed and operated
by the Commissioners, water service rates, shall be
established by the Commissioners. All front foot assess-
ments shall run for an equal term of years; provided, however,
that any property owner may, at his option within one year
from the time said front foot assessment or benefit charge is
levied, extinguish the same by the payment in cash, in one
sum, of the proportion of the estimated cost of the project of
which the construction abutting upon his property is a part,
represented by the number of front feet with which he is
assessed, with interest at the rate of six per cent per annum
from the date of said levy, less any annual payment that may
have been made thereon. The Commissioners, however, in
estimating said cost for the purpose of extinguishment, may
add thereto a reasonable margin to protect themselves against
possible changes in the cost of construction and the loss of
interest. All sums received under such plan of extinguish-
ment shall be preserved intact by the treasurer of Baltimore
County, less the payment of the proportion of interest and
sinking fund properly chargeable to the amount so received,
and used for future construction. The said assessments and
charges shall be and constitute a lien upon the property
chargeable with the same until paid. All such assessments
and charges, including those past due and in arrears as well
as those due and becoming due in the future, excepting water
service charges, which shall be collected as heretofore speci-
fied in Section 332, shall be due, if payable annually, on the
first day of January in each and every year and shall be col-
lected by the Treasurer of Baltimore County in the same
manner and at the same time as State and County taxes are
collected. In the event any such annual assessment or charge
be not paid when due, interest thereon, beginning on the first