9 county-level rules, plus city-specific rules for 2 cities in Monterey County, California.
Verified from official government sources
Unincorporated Monterey County sets no cosmetic limit on a watered, maintained lawn. The control on tall, dry grass is fire-driven: County fuel-management guidance directs cutting dead and dry grass to a maximum of 4 inches and clearing flammable vegetation, layered on top of California's PRC 4291 defensible-space law.
California Public Resources Code § 4291
Maintain defensible space of 100 feet from each side and from the front and rear of the structure, but not beyond the property line. ... 'Fuel' means any combustible material, including petroleum-based products, cultivated landscape plants, grasses, and weeds, and wildland vegetation.
Routine pruning of ordinary private trees in unincorporated Monterey County needs no permit, but the County's protected-tree rules limit cutting of oaks and other protected species. Under the inland ordinance you may not remove or cut more than one-third of the green foliage of a protected tree without a tree-removal permit.
Monterey County Code § 21.64.260 (Preservation of oak and other protected trees)
Landmark oak trees are those trees which are twenty-four (24) inches or more in diameter when measured two feet above the ground, or trees which are visually significant, historically significant, or exemplary of their species. No landmark oak tree shall be removed in any area except as may be approved by the Director of Planning.
Unincorporated Monterey County actively protects native trees. Removing oaks, Monterey pine, Monterey cypress, or redwood generally requires a county Tree Removal Permit; removing more than three protected trees on a parcel triggers a Use Permit. Coastal Zone removals also need a Coastal Development Permit.
Unincorporated Monterey County regulates weeds two ways: Chapter 10.46 of the County Code (Weed Control) and fire-driven hazardous-vegetation abatement under California's defensible-space laws. Dry weeds, dead grass, and flammable vegetation that become a fire menace must be cleared, or the County/fire district can abate and bill the owner.
California Health & Safety Code § 14875 (the state authority implemented by MCC Chapter 10.46)
'Weeds' means ... vegetation that is not pruned or is otherwise neglected so as to attain such large growth as to become a fire menace to adjacent improved property; vegetation that is otherwise noxious or dangerous; poison oak and poison ivy when the conditions of growth constitute a menace to the public health; and dry grass, stubble, brush, litter, or other flammable material which endangers...
There is no single countywide watering schedule. Outdoor water rules come from each water provider plus statewide law: California permanently bans wasteful practices like runoff, hosing pavement, and non-recirculating fountains. On the Monterey Peninsula, the Water Management District (MPWMD) adds strict water-efficiency rules.
MPWMD Rule 142.C.11 (Residential Water Efficiency Standards for New Structures - Landscaping)
All New Construction (including new buildings with landscape or other new landscape, such as a park, playground, or Greenbelt without an associated building) shall install and maintain landscapes that comply with Rule 142.1.
Capturing rooftop rainwater is legal in unincorporated Monterey County, governed mainly by California's Rainwater Capture Act of 2012. No state water-rights permit is needed for rooftop, non-potable outdoor use, and simple rain barrels generally need no plumbing permit. Larger or plumbed systems may trigger building-code review.
Homeowners aren't forced to plant natives, but water-efficient landscape rules push qualifying projects toward low-water, climate-appropriate plants and limit thirsty turf. California's MWELO applies countywide, and on the Monterey Peninsula MPWMD's Rule 142.1 imposes even stricter water-efficient landscape standards. State law also protects low-water plantings from HOA bans.
Unincorporated Monterey County has no countywide ban on artificial turf. Synthetic lawns are a water-saving option treated as a landscaping/site matter, and may need to appear on a required landscape plan for qualifying projects. California Civil Code 4735 bars HOAs from prohibiting artificial turf that resembles grass.
Under California SB 1383, effective January 1, 2022, residents in unincorporated Monterey County must keep organic waste (food scraps, yard trimmings, food-soiled paper) out of the trash and use the required green-cart organics collection. Backyard composting is still allowed and encouraged but does not by itself exempt a household from service.
2 cities in Monterey County have their own landscaping rules rules. Each link goes to that city's dedicated page with code citations.
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