Colorado residents will be allowed to store up to 110 gallons of rainwater in two 55-gallon barrels.
The bill takes effect in August 2016 unless a petition is filed for a voter referendum, meaning the proposal would be voted on by the public in the November elections.
Colorado's farmers have been divided over the proposed law with opponents claiming rainwater collection barrels would decrease the amount of surface runoff which provides water to downstream areas.
As a compromise, language to preserve prior-appropriation rights was added after the House bill passed in February, to protect the water supply guaranteed to those with older rights. The new law also enables oversight from the state engineer and directs them to study the effects of the changed law over a 3-year period.
According to the Denver Post, the Colorado Farm Bureau was an opponent of the bill until those caveats were added.
State Senator Jerry Sonnenberg was one of the biggest voices in opposition to the new law but called the state oversight directive to study the observed effects of a "saving grace" for water rights holders.
Water law is so important in Colorado that it is included in the state's original constitution and managed by a state agency.
The bill was helped by a recent study by Colorado State University which found that the use of rainwater collection barrels would not significantly decrease the amount of surface runoff flowing downstream."That's hard for people to understand when the state owns all the water and is charged in the constitution to distribute that water," Sen. Sonnenberg told Denver's 9NEWS.
The bill's passage comes amid an increasing number of Colorado initiatives to conserve resources and reduce strain on the environment.
Colorado's Water Conservation Board recently released the Colorado Water Plan in November 2015 as part of the state's new effort to increase sustainability of water supplies, following on an executive order from Governor Hickenlooper. The new plan is part of the state's increased effortfor reducing water scarcity in Colorado and downstream flow to western states. The plan aims to create measurable goals as increased competition further strains the limited water resources in the state.




They are working diligently on a bill to allow people to breath more air. It's gonna be great! Can you imagine? Water and air! OMG! What's next, cultivating your own food? No! Don't take it too far!