Rainwater Harvesting: Carson vs El Monte
How do rainwater harvesting rules compare between Carson, CA and El Monte, CA?
Carson and El Monte have similar restriction levels.
Carson, CA
Los Angeles County
California's Rainwater Capture Act of 2012 (Water Code §§10573–10574) authorizes residential and commercial property owners to install rooftop rainwater capture systems without a water right permit. Carson does not impose a separate local prohibition; small rain barrel installations (≤100 gallons aggregate, gravity-fed) are exempt from plumbing permits under CPC §1602.10.
View full Carson rules →El Monte, CA
Los Angeles County
California law (Rainwater Capture Act of 2012, AB 1750) allows residential rainwater harvesting from rooftops without a state water-rights permit. El Monte does not restrict residential rain barrels and Chapter 13.16 (Stormwater) plus the city's LID (Low Impact Development) standards actively encourage onsite rainwater capture.
View full El Monte rules →Key Facts Comparison
| Fact | Carson | El Monte |
|---|---|---|
| State authority | Water Code §§10573–10574 (Rainwater Capture Act of 2012) | Cal. Water Code §10573 (AB 1750, 2012) |
| Permit exemption | ≤100 gallons gravity-fed barrels — CPC §1602.10 | - |
| Permit required | Systems >100 gal or plumbed into building | - |
| LID credit | Eligible for Low Impact Development credit under MS4 permit | - |
| Residential rain barrels | - | Allowed without permit |
| City code | - | EMMC Chapter 13.16 Stormwater + LID ordinance |
| Large cisterns | - | Plumbing permit per CPC Ch. 17 |
Highlighted rows indicate differences between cities.
Carson FAQ
Can I install a rain barrel in Carson without a permit?
Yes — gravity-fed rainwater barrels totaling 100 gallons or less are exempt from plumbing permits under California Plumbing Code §1602.10.
Can I use harvested rainwater indoors?
Indoor non-potable uses (toilet flushing, clothes washing) require a plumbing permit and compliance with California Plumbing Code Chapter 16 alternate water source requirements.
El Monte FAQ
Can I install a rain barrel without a permit?
Yes. Residential rooftop rain barrels and similar small rainwater catchment for landscape irrigation are allowed without a city permit and without a state water-rights permit under California Water Code §10573.
Does El Monte require new homes to capture stormwater?
Yes for projects subject to the city's Low Impact Development standards under EMMC Chapter 13.16, which were adopted to comply with the Los Angeles MS4 permit and require onsite retention through rainfall harvest, infiltration, or biofiltration.
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