El Cajon, CA Landscaping Rules: Rainwater Harvesting (2026)
Key Facts
- Legal Status
- Legal. AB 1750 (2012)
- Permit Exempt
- Under 5,000 gallons
- Approved Uses
- Irrigation, non-potable only
- Rebates
- Helix Water District
- Vector Control
- Prevent standing water mosquitoes
Summary
Rainwater harvesting is legal and encouraged in El Cajon. California AB 1750 (2012) allows residential rainwater collection without a permit. Rain barrels under 5,000 gallons are exempt from building permits. The Helix Water District provides rebates for rain barrel installations.
PART 2.4. Rainwater Capture Act of 2012 10570. This part shall be known, and may be cited, as the Rainwater Capture Act of 2012. 10571. The Legislature finds and declares all of the following:
(a) As California has grown and developed, the amount of stormwater flowing off buildings, parking lots, roads, and other impervious surfaces into surface water streams, flood channels, and storm sewers has increased, thereby reducing the volume of water allowed to infiltrate into groundwater aquifers and increasing water and pollution flowing to the ocean and other surface waters. At the same time, recurring droughts and water shortages in California have made local water supply augmentation and water conservation efforts a priority. 10573. Solely for the purposes of this part, and unless the context otherwise requires, the following definitions govern the construction of this part:
(b) "Rain barrel system" is a type of rainwater capture system that does not use electricity or a water pump and is not connected to or reliant on a potable water system.
(c) "Rainwater" means precipitation on any public or private parcel that has not entered an offsite storm drain system or channel, a flood control channel, or any other stream channel, and has not previously been put to beneficial use.
(d) "Rainwater capture system" means a facility designed to capture, retain, and store rainwater flowing off a building rooftop for subsequent onsite use. 10574. Use of rainwater collected from rooftops does not require a water right permit pursuant to Section 1201.
Full Breakdown
Rainwater harvesting in El Cajon is permitted under California law. AB 1750 (2012) established the right of residents to collect rainwater from rooftop surfaces for non-potable uses including landscape irrigation. Rain barrels and cisterns with capacity under 5,000 gallons are generally exempt from building permit requirements. Larger systems may require a building permit. Collected rainwater may be used for outdoor irrigation, car washing, and other non-potable purposes but not for drinking without treatment. The Helix Water District, which serves El Cajon, periodically offers rebates for rain barrel purchases and installation. The city's stormwater management program encourages on-site retention of rainwater as a best management practice. Standing water must be managed to prevent mosquito breeding per San Diego County Vector Control requirements.
Violations & Fines
No permit violations for residential rain barrels under 5,000 gallons. Standing water that breeds mosquitoes may be cited by San Diego County Vector Control. Large cisterns (5,000+ gallons) without a building permit may be cited.
Frequently Asked Questions
Can I collect rainwater in El Cajon?
Are there rebates for rain barrels in El Cajon?
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Sources & Official References
Other rules in El Cajon
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Rainwater Harvesting in Nearby Cities
How other cities in San Diego County handle rainwater harvesting.