Rocklin has no city-specific rainwater harvesting ordinance. Residential rainwater capture is governed by California Plumbing Code (Title 24 Part 5) Chapter 17 - Nonpotable Rainwater Catchment Systems and the California Rainwater Capture Act (Water Code 10574). Outdoor barrels under 360 gallons used for landscape irrigation generally require no permit; cistern systems with potable plumbing connections require a Building Division plumbing permit.
California Water Code Section 10574 (Rainwater Capture Act of 2012) authorizes property owners to install, maintain, and operate rain barrels and cisterns for non-potable indoor and outdoor uses without a water right permit from the State Water Board. California Plumbing Code Chapter 17 (adopted via RMC Title 15 Buildings & Construction) governs catchment system design, backflow prevention, labeling, and overflow. Rocklin Building Division processes plumbing permits for plumbed-in systems. Stormwater overflow must not run off into the street under the City's NPDES storm water management program. The City's Water Efficient Landscape Guidelines (MWELO compliance) recognize rainwater capture toward landscape water budgets. No city rebate program is currently published; check PCWA at pcwa.net for water-supplier rebates.
Unpermitted plumbed cistern: stop work and standard Building Division permit fees plus investigation fee under RMC Title 15. Cross-connection to potable supply without backflow: addressed by PCWA cross-connection rules.
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