CA AB1466

Allows courts to treat claimants extracting minor quantities of water (up to 5 acre-feet per year) separately from other parties in groundwater adjudication proceedings, rather than only exempting them, to reduce their participation burden

Creates a presumption of accuracy for initial disclosure facts when a party claims annual extraction of 100 acre-feet or less, shifting the burden of proof to any party challenging those facts

Requires initial disclosures for agricultural water use to include specific information about crop types grown and acres irrigated during the preceding 10 years

Mandates that courts request technical reports from groundwater sustainability agencies in basins with approved groundwater sustainability plans, with reports quantifying water use by parties who have not appeared in court

Establishes that technical reports from groundwater sustainability agencies serve as prima facie evidence of physical facts, with agencies entitled to reimbursement of expenses apportioned equitably among the parties