Clearlake hears detailed briefing on water-rate law, capacity fees and consolidation options

Mark Hildebrand, a financial‑management consultant, told the Clearlake City Council on Sept. 5 that any change to water rates must satisfy Proposition 218’s substantive and procedural requirements and be demonstrably proportional to the cost of providing service. Hildebrand outlined the three legal and technical steps in a rate study: projecting revenue requirements, doing a cost‑of‑service allocation and designing customer bills.

Why it matters: Council members are weighing whether to pursue regionalization or consolidation of several small local water purveyors. That choice affects who pays for aging pipes, how new development is charged and how grant money or rate revenue is counted in long‑term plans.

Hildebrand explained that Proposition 218 prohibits charging customers more than the cost of providing service, requires clear cost allocations among customer classes, and mandates at least 45 days’ notice and a public hearing before a rate increase; written protests by more than 50% of property owners can block proposed increases. He described three common rate structures — uniform, tiered and budget‑based tiers — and said tiered rates can be used to balance conservation and affordability so long as the structure is cost‑based.

On capacity charges (developer fees), Hildebrand noted the applicable legal standard in state law and described two common methods: a “buying” approach that accounts for depreciation of existing infrastructure and an “incremental” approach that assigns the full cost of new infrastructure to developers. He recommended a hybrid if the system has some spare pipeline capacity but constrained treatment capacity.

Council and public questions focused on reserve targets, the amount a city of Clearlake’s size should hold (Hildebrand suggested operating reserves equal to about four to six months of operating costs and an overall reserve package roughly the size of annual operating costs), and whether to count uncertain grants when setting rates. Hildebrand advised planning conservatively — adopt rates that work without grants, and then reduce rates later if grant funding is secured.

Roscoe, who provided a local rate comparison, said many nearby systems draw from different water sources and that Clear Lake surface water requires more treatment, which raises costs compared with groundwater systems. Members of the public representing county and district systems described years of grant‑funded upgrades and warned that grant success does not guarantee lower rates.

Next steps: Council asked for copies of the presentation and supporting charts, and staff indicated they will return with additional materials and, if the board of supervisors approves a related action, a request for a council resolution. The city manager also reported two recent disaster‑recovery awards that include $400,000 for technical assistance related to water consolidation efforts.