Rainwater Harvesting: Carson vs Santa Monica
How do rainwater harvesting rules compare between Carson, CA and Santa Monica, CA?
Carson and Santa Monica 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 →Santa Monica, CA
Los Angeles County
Santa Monica strongly encourages rainwater harvesting as part of its water self-sufficiency goal. The city promotes stormwater harvesting through BMPs and infrastructure. Landscape rebates are available for rainwater capture systems.
View full Santa Monica rules →Key Facts Comparison
| Fact | Carson | Santa Monica |
|---|---|---|
| State authority | Water Code §§10573–10574 (Rainwater Capture Act of 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 | - |
| Encouraged | - | Strongly promoted |
| Rebates | - | Available for capture systems |
| Water Neutrality | - | SMMC §7.16.050 |
| State Law | - | AB 1750 protects collection |
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.
Santa Monica FAQ
Can I collect rainwater legally?
Yes. California allows residential rainwater harvesting without significant restrictions.
Do I need a permit for rain barrels?
Standard rain barrels typically do not need permits. Large cistern systems may require building permits.
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