Environmental Rules in La Mesa, CA (2026)
5 verified environmental rules for La Mesa, California, sourced directly from the municipal code and official government pages.
Verified from official government sources
Stormwater Management
La Mesa's storm water ordinance bars sending anything but rain into the city's storm drains. Municipal Code Section 7.18.040 prohibits discharging non-storm water into the storm water conveyance system or receiving waters, covering everything from wash water and pool chemicals to construction and food-service waste, with violations charged under Section 7.18.230 as a misdemeanor punishable by up to $1,000 and six months in jail.
La Mesa Bans Illegal Storm Water Discharges
Some RestrictionsLa Mesa Municipal Code §§ 7.18.040(B), 7.18.230(A)
B.Discharge of Non-Storm Water Prohibited. No person shall discharge non-storm water directly or indirectly into the storm water conveyance system or receiving waters. ... A.Misdemeanor Violation. Notwithstanding any other provision of this code, a violation of this chapter is a misdemeanor punishable by a fine of not more than one thousand dollars or imprisonment in the county jail for a perio...
Erosion Control
In the City of La Mesa, anyone clearing, grading, or building on a slope must control erosion under Municipal Code Chapter 7.18. Slopes over five feet high, larger than 250 square feet, and steeper than 3:1 must stay continuously protected from erosion, and cleared or graded ground left exposed is capped at seventeen acres unless the city engineer approves more in writing.
La Mesa Construction Erosion & Sediment Control Rules
Some RestrictionsLa Mesa Municipal Code § 7.18.140
A.Eroded Soils. Prior to the rainy season, dischargers must remove or secure any significant accumulations of eroded soils from slopes previously disturbed by clearing or grading, if those eroded soils could otherwise enter the storm water conveyance system or receiving waters during the rainy season. Slopes more than five feet in height, more than two hundred fifty square feet in total area, a...
Flood Zones
In the City of La Mesa, no structure or land in a mapped flood hazard area can be built, altered, or extended without a development permit under Municipal Code Section 7.19.130. The city has adopted FEMA's January 31, 2001 Flood Insurance Study and Flood Insurance Rate Maps for Community No. 060292 by reference, and building without full compliance is a misdemeanor under Section 7.19.080.
La Mesa Floodplain Development Permit Rules
Some RestrictionsLa Mesa Municipal Code §§ 7.19.070, 7.19.080
The areas of special flood hazard identified by the Federal Insurance Administration (FIA) of the Federal Emergency Management Agency (FEMA) in the Flood Insurance Study (FIS) dated January 31, 2001, and accompanying Flood Insurance Rate Maps (FIRMs) which all become effective July 2, 2002, and all subsequent amendments and/or revisions, are hereby adopted by reference and declared to be a part...
Defensible Space
La Mesa's water-efficient landscape ordinance requires new development landscape plans to address fire safety and demonstrate compliance with state and city defensible space requirements around buildings, and to avoid fire-prone vegetation, under LMMC § 14.29.070(a)(5). The rule applies to projects with 2,500 square feet or more of landscaping, or new single-family homes with 5,000 square feet or more, reviewed by the community development director.
La Mesa Landscape Defensible Space Requirement
Light RestrictionsLa Mesa Municipal Code § 14.29.070(a)(5)
(a)The planting and irrigation plans required by Section 14.29.050 shall be prepared by a licensed landscape architect, licensed civil engineer, licensed architect or other landscape professional appropriately licensed by the state. The plans shall: ... (4)Demonstrate compliance with best management practices required by the City of La Mesa Storm Water Management and Discharge Control Ordinance...
Flood Elevation Requirements
In the City of La Mesa, new and substantially improved homes in a mapped flood zone must sit at least one foot above the base flood elevation, and higher still in AO zones without a mapped depth. Municipal Code Section 7.19.170(c) sets these elevation and floodproofing standards, enforced by the city engineer as floodplain administrator.
La Mesa Base Flood Elevation Freeboard Rule
Some RestrictionsLa Mesa Municipal Code § 7.19.170(c)
(c)Elevation and Floodproofing. ... (1)Residential construction, new or substantial improvement, shall have the lowest floor, including basement.(a)In an AO zone, elevated above the highest adjacent grade to a height equal to or exceeding one foot above the depth number specified in feet on the FIRM, or elevated at least three feet above the highest adjacent grade if no depth number is specifie...
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