The Board has previously established six groundwater charge zones for the District which are described below.

• Zone A – District portion of the Santa Ynez River alluvial channel from San Lucas Bridge downstream to Lompoc Narrows.

• Zone B – District portion of the Lompoc Plain, Lompoc Upland and Lompoc Terrace groundwater subareas.

• Zone C – All other portions of the District not included in Zones A, B, D, E and F.

• Zone D – District portion of the Buellton Upland subarea.

• Zone E – District portion of the Santa Ynez Upland subarea.

• Zone F – District portion of the Santa Rita Upland subarea.