Menifee Municipal Code Ch. 15.04 (Landscape Water Use Efficiency) explicitly encourages onsite stormwater capture and graywater reuse for landscape irrigation. Graywater installations must comply with the California Plumbing Code (CPC Chapter 16A). State law — the Rainwater Capture Act of 2012 (AB 1750, Cal. Water Code §10574) — permits rooftop rainwater harvesting without a water-rights permit. EMWD offers graywater 3-way diverter-valve rebates (up to $50) for laundry-to-landscape systems serving Menifee customers. The City requires a building permit only when rainwater storage tanks exceed thresholds in the California Plumbing/Building Code (typically tanks ≥5,000 gallons or pressurized systems tied to potable supply).
Ch. 15.04 implements California's Model Water Efficient Landscape Ordinance (MWELO, 23 CCR §490 et seq.) locally. The chapter's intent statements call out recycled-water use where the water purveyor (EMWD) makes it available and encourage graywater for landscape irrigation 'subject to the requirements of the California Plumbing Code.' Laundry-to-Landscape (L2L) graywater systems are exempt from permitting under CPC §1503.1.1 when single-fixture, gravity-fed, and not pressurized. Larger graywater systems (multi-fixture, ≥250 gallons/day, pressurized) require a plumbing permit. Rooftop rainwater for outdoor irrigation is unregulated by water-rights law per AB 1750. Cross-connection control to the potable system is mandatory under CPC §603 and EMWD backflow rules. Cisterns and rain barrels must be covered/screened to prevent mosquito breeding under Cal. Health & Safety Code §2270 et seq.
Unpermitted pressurized graywater system or cross-connection: plumbing-code violation, mandatory correction, stop-work possible. Tank without mosquito screen: vector-control nuisance. Discharge of graywater off-site (to storm drain, neighbor) violates Santa Ana RWQCB NPDES MS4 permit conditions.
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Menifee, CA
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