The San Mateo Section 8 waiting list — now officially the Housing Authority of the County of San Mateo’s Moving to Work tenant-based waiting list — is continuously open, so you can submit a pre-application through the HACSM online portal at any time without waiting for an enrollment window.1County of San Mateo. Apply to Housing Authority Waiting Lists Getting on the list is the easy part. Qualifying, staying on it, and eventually using a voucher in one of the country’s most expensive rental markets are the harder parts, and the local rules in San Mateo County are different enough from standard Section 8 that generic advice can lead you wrong.
Who Qualifies
Federal rules require that at least 75% of families admitted to any Housing Choice Voucher program come from extremely low-income households — those earning no more than 30% of area median income (AMI).2eCFR. 24 CFR 982.201 – Eligibility and Targeting Remaining slots go to very low-income families (50% AMI), or in limited cases low-income families (80% AMI) who meet additional criteria in HACSM’s administrative plan.
For a four-person household in San Mateo County, the 2025 income ceilings are:
- Extremely low income (30% AMI): $58,750
- Very low income (50% AMI): $97,900
- Low income (80% AMI): $156,650
These numbers scale with household size. A single person has a lower threshold; a family of eight has a higher one.3California Department of Housing and Community Development. 2025 State Income Limits HUD updates them annually, and HACSM publishes the current figures on its website.4County of San Mateo. Income Limits and Rent Payments
Beyond income, every applicant must be a U.S. citizen or have eligible immigration status. The household must meet HUD’s definition of a “family,” which is broad: a single person living alone, a couple without children, a multi-generational household, or any group presenting together for assistance all qualify, regardless of marital status.2eCFR. 24 CFR 982.201 – Eligibility and Targeting If you or anyone in your household has a disability, you can request reasonable accommodations to standard rules — extra time to gather documents, help communicating with staff, or a larger unit size for medical equipment. HACSM can verify that the disability exists and that the accommodation is necessary, but it cannot ask for your medical records.
How to Apply
You apply through HACSM’s online portal, creating an account with a valid email address. That same portal is where you will later check your status and report changes, so keep your login details somewhere you can find them.1County of San Mateo. Apply to Housing Authority Waiting Lists
The pre-application asks for basic information about every person who will live in the household:
- Full legal names and dates of birth
- Social Security numbers for all household members
- Total gross household income from all sources, including wages, Social Security, child support, public assistance, and other recurring payments
- Current mailing address, phone number, and email
Have recent pay stubs or benefit letters in front of you while you fill out the form. Numbers that match official records keep your application moving; estimates that don’t match create delays or, worse, raise flags later.5U.S. Department of Housing and Urban Development. Common Documents for Public Housing and HCV Applicants
If you believe you qualify for a local preference — categories commonly include local residents, veterans, people experiencing homelessness, households with a disabled member, and victims of domestic violence — flag it on the application and be ready to document it. HACSM’s specific preferences are set out in its administrative plan, and a preference can move you ahead of applicants who filed earlier.2eCFR. 24 CFR 982.201 – Eligibility and Targeting
There is no published estimate of how long the San Mateo County wait typically runs. In high-cost Bay Area counties, waits of several years are common.
Local Rules That Change the Math
HACSM has operated under HUD’s Moving to Work (MTW) demonstration since 1998, with its agreement extended through 2028.6U.S. Department of Housing and Urban Development. Housing Authority of the County of San Mateo MTW Plan That status lets the agency modify standard HUD rules, and a few of those modifications directly affect what your voucher does for you:
- No 40% affordability cap on new leases. Under standard HCV rules, a family cannot spend more than 40% of adjusted income on rent and utilities at initial lease-up. HACSM eliminated that cap, which gives families more options in an expensive market but also means you can lock yourself into a heavier rent burden.
- Tiered subsidy tables. HACSM tells you the maximum dollar amount it will contribute at the time your voucher is issued, before you start searching, rather than calculating after you find a unit.
- Triennial recertification for elderly and disabled households. Qualifying households recertify every three years instead of annually.
- Higher asset threshold. HACSM does not count income from assets unless the household holds more than $50,000 in total assets.
Advice written for standard Section 8 may not apply to your situation. When something a general guide tells you conflicts with what HACSM tells you, HACSM governs.7County of San Mateo. Section 8 Housing Voucher Program Guide
Staying on the List
The single biggest avoidable way to lose your place is missing a piece of mail. HACSM periodically verifies that everyone on the list still needs assistance by sending a notice with a firm response deadline. If the letter went to an old address, got mistaken for junk, or sat unopened, HACSM will remove you. There is no grace period, and getting back on means starting over.
To avoid that outcome, update your contact information and household details whenever anything changes: a move, a new phone number, a household member added or lost, or a significant income change. You can report changes through the online portal or in writing. A written notice must include the head of household’s full name and the last four digits of their Social Security number.8County of San Mateo. Report a Change to Your Rental Assistance Application
When Your Name Comes Up
HACSM will contact you for a full eligibility interview. Income and household composition are reverified against current documentation at that point, not the estimates from your original pre-application. If you still qualify, you receive a voucher that specifies the maximum subsidy HACSM will pay.6U.S. Department of Housing and Urban Development. Housing Authority of the County of San Mateo MTW Plan
You then have a limited window to find a landlord willing to accept the voucher and a unit that passes inspection. The exact number of days varies by housing authority; many agencies give 60 to 180 days, with extensions possible for documented hardship or disability-related needs. If you cannot secure a unit before the voucher expires, you lose the assistance and typically return to the waiting list.
Your share of rent is the greater of 30% of your monthly adjusted income or 10% of your monthly gross income.9U.S. Department of Housing and Urban Development. Calculating Rent and Housing Assistance Payments HACSM covers the difference between your share and the actual rent, up to the payment standard for your voucher size and location. If you choose a unit where rent exceeds the payment standard, you pay the overage out of pocket. Because HACSM has eliminated the 40% cap, you technically can rent a pricier unit, but a larger share of your income will go to housing.
Before HACSM approves any unit, it must pass a Housing Quality Standards inspection covering health and safety basics: working plumbing and electricity, no lead paint hazards, functioning smoke detectors, secure doors and windows, a working kitchen, and a complete bathroom.10U.S. Department of Housing and Urban Development. Inspection Checklist Units that fail can be re-inspected after repairs, but that time comes out of your search window.
Moving with Your Voucher
A tenant-based voucher is portable: you can take it to any jurisdiction in the country that runs an HCV program. If you had a legal residence in San Mateo County when you first applied, you can port your voucher as soon as it is issued. If you did not live in the county when you applied, you generally must lease a unit within San Mateo County for at least 12 months before you can move elsewhere.11eCFR. 24 CFR 982.353 – Where Family Can Lease a Unit with Tenant-Based Assistance Victims of domestic violence, sexual assault, or stalking are exempt from that residency requirement.
When you port, your subsidy amount will likely change. The receiving housing authority sets its own payment standards and utility allowances based on local rents, and applies its own screening criteria. Moving to a lower-cost region can mean your voucher covers more of the rent; moving somewhere equally expensive can increase your out-of-pocket costs.
If You Are Denied
If HACSM denies your application or removes you from the list, it must send a written notice explaining why and telling you how to request an informal review and the deadline for doing so.12eCFR. 24 CFR 982.554 – Informal Review for Applicant Missing that deadline means giving up the right to challenge the decision.
At the review, you appear before someone who was not involved in the original decision. You can present documents, bring witnesses, and bring an attorney or advocate. HACSM sends a written decision with its reasoning afterward. If the outcome is still unfavorable, judicial review may be available, though filing deadlines can be as short as 90 days.
Not every decision is reviewable. HACSM is not required to offer an informal review for the bedroom size assigned to your voucher, a refusal to extend your search period, or a determination that a specific unit failed inspection.12eCFR. 24 CFR 982.554 – Informal Review for Applicant
Penalties for False Information
Everything on your pre-application feeds a federal housing program, and knowingly providing false information is a federal crime under 18 U.S.C. § 1001. The statute reaches anyone who makes a materially false statement to a federal agency, including information submitted to a local housing authority administering HUD funds. The penalty is up to five years in prison and a fine that can reach $250,000 for a felony offense.13Office of the Law Revision Counsel. 18 USC 1001 – Statements or Entries Generally A fraud finding also results in permanent disqualification from the voucher program. If you are unsure whether a particular income source or household member needs to be reported, ask HACSM before submitting. An honest mistake is correctable; an intentional omission is not.