7 C.F.R. § 760.1812
(f) The county average percentage of loss is the average percentage of loss from producers eligible for payment under paragraph (b) of this section if at least 5 producers in a county are eligible for payment for a crop under paragraph (b) of this section. If less than 5 producers in a county are eligible for payment for a crop under paragraph (b) of this section, the Deputy Administrator will:
(g) The county average loss per unit of measure is based on the weighted average sales price from producers eligible for payment under paragraph (d) of this section if at least 5 producers in a county are eligible for payment for a crop under paragraph (d) of this section. If less than 5 producers are eligible for payment in a county under paragraph (d) of this section, the Deputy Administrator will: