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AB-1772 • 2026

Fish and wildlife: invasive mussels.

Fish and wildlife: invasive mussels.

Agriculture Crime Education
Passed Legislature

This bill passed both chambers and reached final enrollment, even if later executive action is not shown here.

Sponsor
Papan
Last action
2026-04-23
Official status
From committee: Amend, and do pass as amended and re-refer to Com. on APPR. (Ayes 12. Noes 0.) (April 23).
Effective date
Not listed

Plain English Breakdown

The bill's full text and details are available through official channels but are not included here due to length constraints.

Rules for Invasive Mussels

This law updates rules about dealing with harmful mussels in California's water systems.

What This Bill Does

  • It requires water system operators to update their plans by January 1, 2026, to address all invasive mussel species present as of that date.
  • If new types of invasive mussels are found after this date, the plan must be updated within 180 days.
  • The law defines 'invasive mussel' to include any nonnative biofouling mussel.
  • It requires the Department of Fish and Wildlife, in consultation with other departments, to create guidelines for preventing invasive mussels from spreading through boats.

Who It Names or Affects

  • Water system operators who must update their plans.
  • People who own or manage reservoirs where certain activities are allowed.
  • Boat owners who may need inspections and decontamination of their watercraft.

Terms To Know

Invasive mussel
A nonnative mussel that can harm the environment or economy.
Biofouling mussel
A type of invasive mussel that attaches to surfaces in water and spreads easily.

Limits and Unknowns

  • The law does not specify how much it will cost local agencies or school districts.
  • It is unclear what specific enforcement actions the Department of Fish and Wildlife can take.
  • Future legislation may be needed to address other aquatic invasive species beyond mussels.

Bill History

  1. 2026-04-23 California Legislative Information

    From committee: Amend, and do pass as amended and re-refer to Com. on APPR. (Ayes 12. Noes 0.) (April 23).

  2. 2026-03-24 California Legislative Information

    Re-referred to Com. on W., P., & W.

  3. 2026-03-23 California Legislative Information

    From committee chair, with author's amendments: Amend, and re-refer to Com. on W., P., & W. Read second time and amended.

  4. 2026-03-23 California Legislative Information

    Referred to Com. on W., P., & W.

  5. 2026-02-10 California Legislative Information

    From printer. May be heard in committee March 12.

  6. 2026-02-09 California Legislative Information

    Read first time. To print.

Official Summary Text

AB 1772, as amended, Papan.
Fish and wildlife:
aquatic
invasive
species: golden
mussels.
Existing law, until January 1, 2030, generally prohibits a person from possessing, importing, shipping, or transporting in the state, or from placing, planting, or causing to be placed or planted in any water in the state, invasive mussels. Existing law requires a public or private agency that operates a water supply system to cooperate with the Department of Fish and Wildlife to implement measures to avoid infestation by invasive mussels and to control or eradicate any infestation that may occur in a water supply system. Existing law requires, if invasive mussels are detected, the operator of a water supply system to, in cooperation with the department, prepare and implement a plan to control or eradicate invasive mussels within the system, and eliminate or minimize any potential downstream transport of
an invasive mussel. Existing law requires, on or before December 31, 2026, the department to review all approved plans and require all plans that do not specifically address all invasive mussel species known to be present in bodies of water in the state as of January 1, 2026, to be updated or revised appropriately to include all invasive mussel species, on or before September 30, 2027. Existing law requires every invasive mussel species to be addressed in a plan no later than 180 days from the date that the species is listed in a certain regulation. Existing law defines “invasive mussel” for these purposes as any nonnative detrimental mussel, as provided.
Under existing law, except as otherwise provided, any violation of the Fish and Game Code, or of any rule, regulation, or order made or adopted under the code, is a crime.
This bill would require the department to require water
supply system operators to update their plans to address all invasive mussel species present in the operator’s water system as of January 1, 2026, as provided. The bill would require a plan to address every invasive mussel species detected in a water supply system after January 1, 2026, no later than 180 days from the date the species is detected. The bill would require a plan to minimize or eliminate the spread of invasive mussels. The bill would revise the definition of “invasive mussel” to mean any nonnative biofouling mussel, as provided. By expanding the scope of a crime, the bill would impose a state-mandated local program.
This bill would require the department, in consultation with the Department of Parks and Recreation and the Department of Food and Agriculture, to develop a voluntary framework to prevent the overland spread of
invasive mussels through the conveyance of watercraft overland. The bill would require the framework to include specified elements, including, among other elements, minimum standards for watercraft inspection, decontamination, and quarantine and a banding program or other mechanisms by which to confirm the inspection, decontamination, or quarantine status of a watercraft.
The California Constitution requires the state to reimburse local agencies and school districts for certain costs mandated by the state. Statutory provisions establish procedures for making that reimbursement.
This bill would provide that no reimbursement is required by this act for a specified reason.
Existing law generally prohibits a person from possessing, importing, shipping, or transporting in the state, or from placing, planting, or causing to be placed or planted in any water within the state, invasive mussels and authorizes the Director of Fish and Wildlife or the director’s designee to engage in various enforcement activities with regard to invasive mussels, as provided. Existing law requires specified entities that own or manage a reservoir, as defined, where certain activities are permitted to monitor and prevent the introduction of invasive mussel species, as specified, and requires any entity that discovers invasive mussels in the state to report the discovery immediately to the department.
This bill would provide that it is the intent of the Legislature to enact subsequent legislation to, among other things, address and prevent
the spread of aquatic invasive species, including, but not limited to, the golden mussel, in California’s waterbodies and water infrastructure systems. The bill would also make various findings and declarations relating to aquatic invasive species.

Current Bill Text

Read the full stored bill text
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