California farmers warn proposed nitrogen fertilizer limits could force operations out of business

California growers are mobilizing against a proposed state law that would impose mandatory nitrogen fertilizer application limits and field-level reporting requirements on irrigated commercial farmland — restrictions that farm groups say would threaten the viability of citrus, nut, lettuce and other specialty crops that define the state’s $59 billion agricultural sector.

Assembly Bill 2447, the Nitrogen Pollution Reduction Act, introduced by Assemblymember Rebecca Bauer-Kahan and sponsored by the Natural Resources Defense Council, would require California’s State Water Resources Control Board to direct regional boards to overhaul the Irrigated Lands Regulatory Program. Under the bill, revised orders would need to be in place by January 1, 2028, mandating farmers to meet specific reductions in nitrogen waste discharges to groundwater. The bill would also require the state board to publish, by July 1, 2027, a statewide methodology for calculating and reporting field-level nitrogen balances — tracking nitrogen inputs, applications, and discharges on a parcel-by-parcel basis.

Renee Pinel, president and CEO of the Western Plant Health Association, said the proposal is designed to move California toward application targets tied to both agronomic efficiency and environmental standards. “Ultimately, they want limits,” she told AgWeb.

Farm groups argue the bill bypasses ongoing regulatory science. In 2023, the Central Coast Regional Water Quality Control Board concluded it could not scientifically justify enforcing nitrogen caps in its Ag Order 4.0 — a ruling that farm organizations have cited as evidence that the proposed legal targets are not yet supported by sufficient data for California’s diverse soil and crop conditions.

For U.S. fertilizer distributors and nitrogen producers, AB 2447 signals the most significant state-level regulatory challenge to fertilizer use in years. California accounted for approximately 1.5 million tonnes of nitrogen fertilizer consumption in 2024, according to USDA estimates. If enacted, mandatory application limits would reduce demand in the state’s most input-intensive crops — pistachios, almonds, citrus, and leafy greens — while creating compliance infrastructure costs that smaller operations may struggle to absorb. The Senate Agriculture Committee markup of the U.S. Farm Bill, targeting June, adds a parallel federal dimension: Sen. Amy Klobuchar has backed bipartisan bills on fertilizer price transparency, though federal action has not proposed application caps.

The bill is currently moving through California legislative committees. Western Growers, which represents specialty crop producers, has flagged AB 2447 as a top-priority opposition target for the 2026 session. The state has lost roughly 30% of its farms over the past decade, according to the organization, as regulatory costs per acre have risen from around $106 twenty years ago to more than $1,600 today.

Source: AgWeb