Unincorporated San Mateo County permits artificial turf installation. Civil Code §4735 preempts HOA bans. Drainage must comply with stormwater regulations. Coastal zone installations may require Coastal Development Permit for larger areas.
San Mateo County allows synthetic/artificial turf as water-efficient lawn replacement. No permit required for residential turf replacement at grade on existing landscape; permits needed only if installation involves grading, retaining walls, or drainage modifications. California Civil Code §4735 prohibits HOAs from banning drought-tolerant landscaping including artificial turf. Installation must include proper base preparation (compacted aggregate) and drainage to prevent runoff; stormwater discharge regulations under the County's MS4 permit apply to large installations. Infill materials subject to environmental review — crumb rubber discouraged, sand and organic infills preferred. Heat concerns real (synthetic turf reaches 150°F+ in direct sun). Coastal zone installations over specific thresholds may trigger Coastal Development Permit review under Local Coastal Program. HOA aesthetic guidelines allowed but cannot effectively prohibit; approval required within 60 days.
No direct County penalties for installation. Drainage causing neighbor runoff: code enforcement action, correction order. HOA illegal bans: homeowner remedies under Civil Code §4735 including injunction and attorney's fees. Unpermitted grading: stop-work order.
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