California Property Tax Exemption for New Rainwater Systems in Effect January 1, 2019




Only Pioneer Provides Rainwater Systems with Long-Lasting Storage


California Senate Bill No. 558, or as it was first known as Prop 72, passed and was approved by the Governor on January 31, 2018. This act added and repealed Section 74.8 of the California Revenue and Taxation Code to exclude property taxes to new construction of rainwater harvesting systems.


Starting January 1, 2019:


– Newly created rainwater systems can be excluded from property tax reassessment with filing a claim

– New homes built with rainwater systems can apply for this exclusion, as long as it’s the first home purchaser and it hasn’t been yet claimed

– Tax incentives for rainwater systems are being offered to enhance the state’s water conservation goals

> Go to California Senate Bill No. 558, Prop 72


The Bill is effective January 1, 2019, to promote the use of rainwater systems as a sustainable water source for both homes and businesses. The property tax exclusion applies only until the building changes ownership however the first purchaser of a home with a rainwater system installed can also claim the exclusion when the owner-builder incorporates the system. This applies to the first homeowner as long as the owner-builder had never intended to occupy or use the building, and did not yet claim the exclusion so that the purchaser buys the building before it’s assessed to the owner-builder.


To claim the property tax exemption for new rainwater systems, taxpayers must file a claim with County tax assessors and provide any documentation necessary to identify the value attributable to the rainwater system, including any rebates. The assessor evaluates the claim and subtracts the value of the rainwater system from the purchase price to determine its new value for property taxes.


This bill specifies that a “rain water capture system is a facility designed to capture, retain and store rain water flowing off a building rooftop or other man-made above the ground hard surface for subsequent onsite use.”


Rainwater systems with Pioneer Water Tanks work well in California since they can be installed with options to add functionality to your systems, like the addition of firefighting nozzles and adapters. Pioneer Water Tanks store the rainwater within the BPA-free, NSF-61 certified for drinking water AQUALINER® Fresh tank liner. The liner storing the water is then protected within the Zincalume Steel tank body that is certified to withstand fire immersion and lasts without corrosion 200% longer than galvanized steel.


Pioneer Water Tanks are the longest-lasting rainwater storage tank, and we include our 20-year warranty to back it. Our systems are delivered in a crate for onsite installation, even in the most rural areas in California.


More Resources about Rainwater Harvesting in California:


The City of San Diego Guide to Rainwater Harvesting


ARCSA Resources:


From the SWRCB Website:

The California Water Code, section 1201, defines water subject to appropriation and authorizes the State Water Board to grant permits for water flowing in any natural channel. Rooftops are not a natural channel, therefore harvest of rainwater from rooftops does not require a water right permit. The State Water Board encourages methods of water collection or diversion, such as rooftop rainwater harvest, that reduce demand on streams and reduce water quality problems associated with stormwater runoff.



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