Hawthorne has no ordinance restricting rain barrels or cisterns, and the city encourages conservation. Rainwater collection is governed mainly by California rules: rooftop rainwater harvesting needs no state water-right permit, and rain-barrel/cistern systems up to 5,000 gallons used for gravity-fed outdoor irrigation are exempt from a plumbing permit.
The City of Hawthorne does not publish a municipal ordinance prohibiting or specially regulating residential rainwater capture, and the city's water-conservation messaging encourages reducing potable-water use. Rainwater harvesting in Hawthorne is therefore controlled primarily by California state law. Under the Rainwater Capture Act and Water Code section 10574, capturing rainwater from rooftops does not require a water-right permit from the State Water Resources Control Board - rooftop rainwater is not subject to the appropriative water-right system. For the physical installation, the California Plumbing Code governs when a permit is needed: exterior rainwater catchment systems with cisterns up to 5,000 gallons are exempt from a plumbing permit when used only for outdoor, non-spray (drip/gravity) irrigation, installed directly on grade, and not requiring electrical power or a makeup water supply; smaller systems (commonly cited at up to about 360 gallons) are exempt even for spray irrigation. Larger, pressurized, or potable/indoor-connected systems, or those tied into the building's plumbing, do require permits and backflow protection. Hawthorne residents installing rain barrels for landscape watering should size and place them to gravity-feed irrigation and keep them disconnected from potable plumbing to stay within the no-permit exemptions, and should still follow the city's irrigation-day and runoff rules when the harvested water is applied. The Metropolitan Water District / SoCal Water$mart region also periodically offers rain-barrel and cistern rebates that local residents may qualify for.
There is no Hawthorne-specific penalty for collecting rainwater. Compliance issues would arise only if a system exceeds the state plumbing-permit exemption (size, pressurization, indoor/potable connection) without a permit and backflow protection, or if harvested water is applied in a way that causes prohibited runoff under the city's water rules.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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Hawthorne city parks are closed overnight: it is unlawful to remain, stay, or loiter in a public park between 11:00 p.m. and 6:00 a.m. the following day with...
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Hawthorne controls light spilling onto neighboring property through the development standards in Municipal Code Chapter 17.20, which prohibit lighting that p...
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Hawthorne does not have a dedicated dark-sky ordinance. Outdoor lighting on residential development is regulated under Municipal Code Chapter 17.20, which re...
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Garage sales in Hawthorne require a permit under Municipal Code Chapter 5.46, and signage is limited. The permit runs for two consecutive days, and only two ...
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Hawthorne regulates non-commercial signs on residential property - including political signs - under Municipal Code Chapter 17.35 (On-Premises Signs). Tempor...
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The City of Hawthorne has no standalone tiny-home or tiny-house-on-wheels ordinance. A fixed-foundation tiny house used as a second dwelling is regulated as ...
Side-by-side rule comparisons with other cities in Los Angeles County.
See how other cities in Los Angeles County handle rainwater harvesting.
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