All collections of any assessments made by any county treasurer shall be paid to the treasurer of the proper district, on or before the tenth day of the next succeeding calendar month. If any county treasurer or other person entrusted with the collection of any assessment made under the provisions of this act, refuses, fails or neglects to make prompt payment of the assessments, or any part thereof, collected under this act to the treasurer of the district upon his presentation of a written demand for the board, then he shall pay a penalty of ten (10%) percent on the amount of his delinquency; such penalty shall at once become due and payable and both he and his sureties shall be liable therefor on his bond provided for in this act.