CA AB508

Modifies conditions for ordering water system consolidation or service extension when a disadvantaged community is "substantially reliant" on domestic wells that fail to provide adequate safe drinking water, rather than requiring reliance on a single domestic well.

Requires the State Water Resources Control Board to consider the number of domestic well owners who have provided or are likely to provide written consent to service extension, without requiring a specific percentage threshold for approval.

Prohibits consolidation or service extension orders from requiring service to a residence served solely by a domestic well unless the residence owner provides written consent; non-consenting owners become ineligible for state water-related grant funding except for emergency or failure mitigation.

Requires the 30-day public meeting notice to include information about water quality concerns, health effects of contaminants, and consolidation/extension opportunities.

Renames "capacity connection fee" to "capacity charge" and limits such charges to the reasonable cost of providing service; specifies the state board retains options to use excess capacity for future consolidations for five years.