Proposition 4 – Water Recycling

State Water Resources Control Board · State of California

At a glance

Proposition 4 – Water Recycling is an open California state grant opportunity from the State Water Resources Control Board (State of California). Applications are due June 30, 2030. Individual awards are listed as up to $15M, with $150M in total estimated funding. Applicant types listed as eligible include nonprofit, public agency and tribal government. It is listed on the California Grants Portal. Cost sharing or matching is required.

Summary assembled from the official notice's fields. The official notice governs.

Key facts

Jul 6, 2025Posted
Jun 30, 2030Application deadlinenext date

Opened: Jul 6, 2025
Close date: Jun 30, 2030
Award floor: Not specified
Award ceiling: $15,000,000
Est. total funding: $150,000,000
Expected awards: Not specified
Matching funds: Required
Funding instrument: Grant

Program details (as published on the California Grants Portal)

Type: Grant
Funding source: State — Proposition 4 Water Recycling
Matching funds: 50%
Funding method: Reimbursement(s) — Grant is calculated at 35% of eligible construction costs up to $15 million per project.
Estimated number of awards: Dependant on number of submissions received, application process, etc.
Award period: Expire June 30, 2033
Expected award announcement: June 30, 2030
Letter of intent: Not required
Geography: All community types are eligible for funding. This includes small and large communities, non-disadvantaged, disadvantaged, and severely disadvantaged communities.
How to submit: Online: https://faast.waterboards.ca.gov/
Latest change note: The Prop 4 appropriation began on 7/1/2025. Backdated the start date in order to fill in FY 25/26 data.

Who can apply

Applicant categories as listed on the California Grants Portal. GrantsJunction maps them to detailed applicant types for search and matching.

Nonprofit
Public Agency
Tribal Government

Additional information on eligibility (from the listing)

Local public agencies, 501(c)(3) nonprofit organizations qualified to do business in California, Public Utilities, Federally and non-federally recognized Native American tribes on the Native American Heritage Commission’s list, and Mutual water companies.

Can your organization apply?

A quick check against the listed applicant types — other requirements in the notice still apply.

Based on the published notice. Review the official notice for complete eligibility requirements.

What it funds

Purpose and description as published on the California Grants Portal.

Purpose

The purpose of the funding is to provide technical and financial assistance to local agencies for the construction of water recycling projects that promote the beneficial use of treated municipal wastewater in order to augment fresh water supplies in California.

Description

Eligible Applicants: Local public agencies, 501(c)(3) nonprofit organizations qualified to do business in California, Public Utilities, Federally and non-federally recognized Native American tribes on the Native American Heritage Commission’s list, and Mutual water companies. Eligible Uses: Eligible projects include recycled water treatment; recycled water storage, distribution, and pumping; groundwater recharge; indirect potable reuse; surface water augmentation; and large scale recycled water projects. Ineligible Uses: Operation and maintenance costs. Eligible Costs: Construction Grant Funding - Construction costs only Construction Grant Funding - Large Scale Recycled Water Projects - Planning, Design, and Construction. Eligible Communities: All community types are eligible for funding. This includes small and large communities, non-disadvantaged, disadvantaged, and severely disadvantaged communities. For more information, please review the Water Recycling Funding Program (WRFP) Guidelines: https://www.waterboards.ca.gov/water_issues/programs/grants_loans/docs/wrfp_guidelines.pdf

Program page on the agency site ↗

Your application plan

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Read the program guidelinesThe agency's solicitation or guidelines set eligibility details, scoring criteria and required documents. Open ↗
Confirm eligibility and fitCheck your organization type and location (see Geography above), and plan for the required matching funds.
Find out how to submitOnline: https://faast.waterboards.ca.gov/ Open ↗
Request letters of support and partner commitmentsPartners need time to write and sign letters; ask early.
Secure the matching funds commitmentGet the match documented (board approval, partner letters or budget lines) before the budget is final.
Finish a full draft of the application and budgetFollow the guidelines' format exactly; state programs often require specific forms and attachments.
Ask the program contact any questions earlysandeep.kals@waterboards.ca.gov Open ↗
Internal review and sign-offLeave time for leadership or board approval and a final proofread.
Submit before June 30, 2030Due by 11:59 p.m. Pacific time. Submit a few days early and keep your submission confirmation.

Program contact (as published)

sandeep.kals@waterboards.ca.gov
1-916-324-8404

Quick answers

When is the deadline for “Proposition 4 – Water Recycling”?

According to the official notice, applications are due June 30, 2030. The notice adds: “Due by 11:59 p.m. Pacific time.” Confirm the deadline and submission time with the agency before applying.

Who is eligible to apply for “Proposition 4 – Water Recycling”?

The official listing names these applicant types as eligible: Nonprofit, Public Agency and Tribal Government. It adds: “Local public agencies, 501(c)(3) nonprofit organizations qualified to do business in California, Public Utilities, Federally and non-federally recognized Native American tribes on the Native American Heritage Commission’s list, and Mutual water companies.” Additional restrictions may apply; review the full guidelines.

How much funding is available through “Proposition 4 – Water Recycling”?

Per the notice, individual awards are listed as up to $15m and total estimated program funding is $150,000,000.

How do I apply for “Proposition 4 – Water Recycling”?

Applications go directly to State Water Resources Control Board, not through GrantsJunction. Submission: online at https://faast.waterboards.ca.gov/. Read the program guidelines on the agency's site first; state programs set their own forms and registration requirements.

Other open California state opportunities, matched on agency, categories and wording.

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