Indiana Code Title 13. Environment § 13-16-1-7

(1) If the balance of the fund collected under IC 13-18-20, once obligated expenditures are subtracted from the balance, exceeds two million five hundred thousand dollars ($2,500,000) as of July 1 each year, the commissioner shall adjust the annual fee schedule to bill an amount, in the aggregate, equivalent to the fee schedule amount, less the excess over two million five hundred thousand dollars ($2,500,000).  Adjustments to the individual bills must be proportional to the applicable fee divided by the total amount required by all the applicable fees.  Adjustments to the annual fees apply only to the next assessment year and then revert to the amounts established under IC 13-18-20.

(2) If the balance of the fund collected under IC 13-20-21, once obligated expenditures are subtracted from the balance, exceeds two million five hundred thousand dollars ($2,500,000) as of July 1 each year, the commissioner shall adjust the annual fee schedule to bill an amount, in the aggregate, equivalent to the fee schedule amount, less the excess over two million five hundred thousand dollars ($2,500,000).  Adjustments to the individual bills must be proportional to the applicable fee divided by the total amount required by all the applicable fees.  Adjustments to the annual fees apply only to the next assessment year and then revert to the amounts established under IC 13-20-21.

(3) If the balance of the fund collected under IC 13-22-12, once obligated expenditures are subtracted from the balance, exceeds two million five hundred thousand dollars ($2,500,000) as of July 1 each year, the commissioner shall adjust the annual fee schedule to bill an amount, in the aggregate, equivalent to the fee schedule amount, less the excess over two million five hundred thousand dollars ($2,500,000).  Adjustments to the individual bills must be proportional to the applicable fee divided by the total amount required by all the applicable fees.  Adjustments to the annual fees apply only to the next assessment year and then revert to the amounts established under IC 13-22-12.