Rainwater Harvesting: Aurora vs Centennial
How do rainwater harvesting rules compare between Aurora, CO and Centennial, CO?
Aurora has fewer restrictions than Centennial.
Aurora, CO
Arapahoe County
Colorado HB 16-1005 allows Aurora residents to collect rooftop rainwater in up to two rain barrels with a combined maximum of 110 gallons, used only on the property of origin for outdoor purposes.
View full Aurora rules →Centennial, CO
Arapahoe County
Colorado HB 16-1005 legalized limited residential rainwater harvesting statewide. Arapahoe County residents may collect up to 110 gallons in max two barrels, outdoor irrigation use only. Prior Appropriation Doctrine still governs—commercial or larger collection requires water right. Cherry Creek watershed adds protections.
View full Centennial rules →Key Facts Comparison
| Fact | Aurora | Centennial |
|---|---|---|
| State law | CO HB 16-1005, CRS 37-96.5-103 | - |
| Max barrels | 2 | - |
| Max capacity | 110 gallons combined | - |
| Use | Outdoor, on-site only | Outdoor, same property only |
| Permit | None for compliant residential | - |
| State Authorization | - | HB 16-1005 (2016) |
| Max Volume | - | 110 gallons, 2 barrels |
| Doctrine | - | Prior Appropriation |
| Commercial | - | Water right required |
Highlighted rows indicate differences between cities.
Aurora FAQ
Can I install a 500-gallon cistern?
Not under the rain-barrel exemption. Larger systems require approval from the Colorado Division of Water Resources and likely a water right.
Can I use the water indoors?
No. Collected rainwater under HB 16-1005 must be used outdoors on the property of origin only.
Centennial FAQ
Can I collect rainwater in Arapahoe County?
Yes, but strictly limited. HB 16-1005 allows up to 110 gallons in two rain barrels for outdoor irrigation only on the property where collected. Indoor use and commercial collection require water rights.
Why is rainwater collection so restricted in Colorado?
Colorado's Prior Appropriation Doctrine gives established water rights holders claim to all precipitation that would naturally flow downstream. HB 16-1005 created the limited residential exception in 2016.
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