Mt. Diablo Unified vs Tustin Unified
CA · 29,494 students • CA · 21,342 students • fiscal year 2024 • swap sides
In one line
- Mt. Diablo Unified and Tustin Unified spend within 2% of each other per student once local price levels are accounted for.
- Both direct a similar share of each operating dollar to classrooms.
- Mt. Diablo Unified reports fewer students per teacher (23.2 vs 25.7). This is a staffing ratio, not an average class size.
Are these even comparable?
Establish the shape of each district before reading a single dollar figure.
| Mt. Diablo Unified | Tustin Unified | |
|---|---|---|
| Students enrolled | 29,494 | 21,342 |
| Schools | 51 | 28 |
| Grades served | K–12 | K–12 |
| Setting | Suburb | City |
| County | Contra Costa County | Orange County |
| State | CA | CA |
| Local price level (US = 100) BEA Regional Price Parity. Above 100 means a dollar buys less here than the national average. | 115.6 | 113.6 |
The headline dollar
Current operating spending per student, shown three ways. The first is what each district reports. The second and third are the honest ones for comparison.
| Mt. Diablo Unified | Tustin Unified | |
|---|---|---|
| Per student, as reported | $16,614 | $16,214 |
| Per student, price-adjusted Divided by the local price level, so both figures are in the same money. | $14,371 | $14,277 |
| Per student, price-adjusted, excluding transport Transportation provision varies enormously between districts and states. Removing it compares the parts both districts actually do. | $14,009 | $14,013 |
| Capital spending per student Buildings and land, reported separately and never folded into the operating figures above. It is lumpy: a district mid-build looks expensive for two years. | Locked | Locked |
Mt. Diablo Unified
Tustin Unified
Where the money comes from
The funding mix determines how exposed a district is to local property values, to state politics, and to federal programmes ending.
Mt. Diablo Unified
- Local 46.7% Locked
- State 43.6% Locked
- Federal 9.7% Locked
Tustin Unified
- Local 53.0% Locked
- State 40.2% Locked
- Federal 6.8% Locked
| Mt. Diablo Unified | Tustin Unified | |
|---|---|---|
| Local share of revenue Mostly property tax. A high share means school budgets track local property values, up and down. | 46.7% | 53.0% |
| State share of revenue | 43.6% | 40.2% |
| Federal share of revenue | 9.7% | 6.8% |
| Total revenue | Locked | Locked |
How CA funds its districts
LCFF — Local Control Funding Formula: a base grant per pupil plus supplemental and concentration grants driven by low-income, English-learner and foster-youth counts.
How CA funds its districts
LCFF — Local Control Funding Formula: a base grant per pupil plus supplemental and concentration grants driven by low-income, English-learner and foster-youth counts.
Where the money goes
The same slices in the same order for both districts, plus the differences by function — because two pie charts side by side hide exactly the thing you want to see.
Mt. Diablo Unified
- Instruction 61.1% Locked
- Instructional staff support 4.6% Locked
- Student support 6.3% Locked
- Operations & maintenance 9.6% Locked
- Transportation 2.5% Locked
- Food service 3.6% Locked
- School administration 6.1% Locked
- District administration 1.2% Locked
- Other support 4.3% Locked
- Other current 3.6% Locked
Tustin Unified
- Instruction 61.5% Locked
- Instructional staff support 4.0% Locked
- Student support 8.4% Locked
- Operations & maintenance 8.1% Locked
- Transportation 1.9% Locked
- Food service 3.3% Locked
- School administration 5.4% Locked
- District administration 1.6% Locked
- Other support 5.1% Locked
- Other current 3.3% Locked
What is actually different
Share of each district's operating dollar, Mt. Diablo Unified minus Tustin Unified. Two pie charts side by side are almost impossible to read against each other; this is the same data as one chart.
| Mt. Diablo Unified | Tustin Unified | |
|---|---|---|
| Cents of each operating dollar reaching classrooms Instruction plus instructional staff support, as a share of current spending. | 65.8% | 65.4% |
| Administration share District office plus school administration. | 7.3% | 7.1% |
| Transportation share | 2.5% | 1.9% |
What the money buys
Staffing levels are the most direct thing a budget converts into.
| Mt. Diablo Unified | Tustin Unified | |
|---|---|---|
| Students per teacher This is a staffing ratio: total enrolment divided by teaching staff. It is NOT average class size, which no national source collects. Actual classes are larger than this number in every district. | 23.2 | 25.7 |
| Students per counsellor | Locked | Locked |
| Students per administrator | Locked | Locked |
| Total salaries All staff, not teachers alone. The federal survey does not separate teacher pay. | Locked | Locked |
Who they serve
The answer to "but they serve different kids" — which is usually a fair objection.
| Mt. Diablo Unified | Tustin Unified | |
|---|---|---|
| Child poverty rate Census SAIPE estimate of children aged 5–17 in poverty within the district boundary. Used instead of free-lunch eligibility, which community eligibility has made unusable for comparison. | 9.8% | 9.5% |
| English learners | 0 | 0 |
| Students with disabilities | 0 | 0 |
| Enrolment change, 5 years | -5.0% | -9.3% |
Results, and results for the money
Stability and risk
The homebuyer’s real question: what is likely to change after I move in?
Mt. Diablo Unified
No stability flags raised.
Tustin Unified
- Declining enrollment Enrolment fell more than 5% over five years. Enrolment decline is the single best predictor of school closures and programme cuts.
| Mt. Diablo Unified | Tustin Unified | |
|---|---|---|
| Enrolment change, 5 years | -5.0% | -9.3% |
| Long-term debt per student | Locked | Locked |
| Debt service share of spending | Locked | Locked |
Enrolling a child
The same checklist for both districts, read off each district’s own enrolment page. Every "required" below links to the sentence it came from.
Mt. Diablo Unified
Enrollment Services - Mt. Diablo Unified School District
Almost nothing could be read off this page — usually a portal that builds its content in the browser. Treat the column below as "we could not tell", and open the district's page yourself.
Read August 25, 2026.
Tustin Unified
Registration runs through PowerSchool. Read August 25, 2026.
Is a seat at your zoned school guaranteed?
Mt. Diablo Unified
We have no such statement from this district — which is not the same as a promise that your zoned school has room. Most districts never publish the policy in either direction, and we have read only a fraction of the ones that do. Ask the school office directly whether your address’s school is enrolling at your child’s grade level before you sign anything.
Tustin Unified
We have no such statement from this district — which is not the same as a promise that your zoned school has room. Most districts never publish the policy in either direction, and we have read only a fraction of the ones that do. Ask the school office directly whether your address’s school is enrolling at your child’s grade level before you sign anything.
- This is the district’s own published wording, not our summary of it. Policies are rewritten between enrolment seasons and a page can be out of date the day after we read it — the school office is the only authority on whether a particular grade at a particular school is full right now.
- A warning here is about capacity, not about your address. It does not mean your child will be moved; it means the district has told you in writing that it may move them.
- Required the page says so, and the sentence is quoted.
- Mentioned only it comes up, but not as a requirement — often a sentence saying the district cannot demand it.
- Not mentioned we read the page and it was not on it. That is not the same as "not required".
- Page not read we have no enrolment page for this district.
Documents to bring
| Mt. Diablo Unified | Tustin Unified | |
|---|---|---|
| Proof of residency | Not mentioned | Required “Copy of your rental contract or lease agreement (must include the landlord/owner signature page) or Escrow papers, mortgage statement, property tax bill, or gr…” |
| Proof of age (usually a birth certificate) | Not mentioned | Required “Certified copy of a birth record.” |
| Immunisation records | Not mentioned | Required “IMMUNIZATION” |
| Physical examination | Not mentioned | Required “Oral Health Assessment Form / Formulario del Examen Dental (TK, K and 1st grade ONLY)” |
| Dental, vision or hearing screening | Not mentioned | Not mentioned |
| Tuberculosis test | Not mentioned | Not mentioned |
| Records from the previous school | Required “Student Records and Transcript Request” | Required “Last Report Card (Kindergarten through Grade 5) or Transcript (Grades 6 through 12)” |
| IEP or 504 plan | Not mentioned | Required “For students with special needs, provide a copy of the current IEP (Individualized Education Plan) and any related assessments.” |
| Custody or guardianship paperwork | Not mentioned | Required “If the student(s) is/are not living with parents, provide current proof of guardianship (example.” |
| Parent or guardian photo ID | Not mentioned | Not mentioned |
| Home language survey | Not mentioned | Not mentioned |
| Emergency contact information | Not mentioned | Not mentioned |
| Proof of income | Not mentioned | Not mentioned |
| Social security number Asked for by some districts. It is not required to enrol, and a school may not refuse a child who does not provide one. We list it because districts ask, not because you must answer. | Not mentioned | Not mentioned |
How enrolling works
Locked 11 steps of the enrolment process — deadlines, appointments, proof of residency — are not shown. What to bring is above, and stays free.
- A blank row means the requirement did not appear on the page we read. It does not mean the district will not ask for it — published lists are routinely incomplete, and the registrar has the final word.
- Requirements change every enrolment season. Check the district’s own page, linked above, before you gather anything.
- A district cannot condition enrolment on your child’s immigration status: under Plyler v. Doe (1982) every child resident in the district is entitled to a free public education. If a district asks for something that would reveal status, you are not obliged to provide it.
- If your family is in temporary or shared housing, the McKinney-Vento Act lets a child enrol immediately without the residency and records documents listed here. Ask for the district’s homeless liaison by name.
Comparability notes
No comparability caveats: these two are a like-for-like pair.
What these numbers are, exactly
- Finance: US Census Bureau Annual Survey of School System Finances (F-33), fiscal year 2024.
- Enrolment, staffing and directory: NCES Common Core of Data via the Urban Institute Education Data Portal, 2024.
- Child poverty: Census SAIPE school-district estimates, 2024.
- Price levels: BEA Regional Price Parities, 2024.
- Districts self-report to the F-33 survey. States differ in what they count as an operating expense, and several pay teacher pensions centrally so that cost never appears in a district’s books. No arithmetic fixes that; we name it instead.
- Property tax basis and borrowing: the same F-33 filing, revenue codes T06 and T02 and the long-term debt schedule (_19H, _21F, _31F, _41F).
Who decides, and what it costs you
Every band above this one asks what a district spends. This one asks who chose to.
Mt. Diablo Unified
The district levies its own school tax
This district raises property tax in its own name. Who sets the rate varies by state — an elected board in some, a public vote in others — but the levy is the school system’s own, and it is the part of a tax bill that school politics moves most directly.
Tustin Unified
The district levies its own school tax
This district raises property tax in its own name. Who sets the rate varies by state — an elected board in some, a public vote in others — but the levy is the school system’s own, and it is the part of a tax bill that school politics moves most directly.
| Mt. Diablo Unified | Tustin Unified | |
|---|---|---|
| School property tax levied, per student Only for districts that levy in their own name. Blank where the county or town levies instead — see the cards above, and read the next row. | $7,868 | $8,351 |
| Appropriated by the county or town, per student What the parent government handed the schools, for dependent systems. This is a general appropriation, not solely property tax. | — | — |
| Property tax as a share of all revenue How much of the budget rides on local property values, and therefore on local votes. | 38.1% | 37.8% |
| Long-term debt already owed, per student The balance at the end of the year, for scale. Repaid over decades, so it is a commitment made by earlier boards rather than a bill arriving now. | Locked | Locked |
| Debt service as a share of spending Interest plus principal repaid this year, against total spending. This is the part of the debt that is being paid now, out of money that would otherwise reach a classroom. | Locked | Locked |
| New long-term debt issued, per student Money borrowed during fiscal year 2024, as reported to the federal survey. What this figure does and does not tell you is set out under the table. | $0 | $0 |
- Mt. Diablo Unified: issued no new long-term debt in fiscal year 2024. That is a reported zero, not a gap in the data.
- Tustin Unified: issued no new long-term debt in fiscal year 2024. That is a reported zero, not a gap in the data.
- A figure in the borrowing row is not a bond voters approved. The federal survey records debt issued, and that includes refinancing existing debt at a new rate — which changes nothing about what a district owes — as well as certificates of participation and lease-revenue debt, which in many states a board can issue with no referendum at all. To find out what was actually on a ballot, check the county election office.
- Debt is repaid over decades. A large balance per student is a commitment made by earlier boards and earlier voters, not a bill arriving this year. The debt service row above it is the part being paid now.
Who sits on the board
Mt. Diablo Unified board of education
- Debra Mason — President term ends 2026
- Keisha Nzewi — Vice President term ends 2028
- Linda Mayo — Trustee term ends 2026
- Brian Lawrence — Trustee term ends 2026
- Tom McDougall — Trustee term ends 2028
- How long a term runs: “The Governing Board is comprised of five trustees who are elected in November to serve staggered four-year terms in office and one Student Board Member who is appointed each school year according to Board Bylaw 9150.”
- The public may speak: “Looking for public comment information?”
Read from the district’s own board page on 2026-08-24. Boards change; the district’s page is the current record, not ours.
What this band does not answer yet
Unlock the full comparison of Mt. Diablo Unified and Tustin Unified
The verdict, the headline dollar, the funding shares, who is served and every comparability caveat are free above, and stay free. What is behind the lock is the detail you would want before acting on any of it:
- capital spending per student
- total revenue and the funding mix in dollars
- the ten-line per-student breakdown of where the money goes
- counsellor and administrator ratios, and the total salary bill
- the debt behind the risk flags — per student, and as a share of spending
- the enrolment process — deadlines, appointments and proof of residency
$19 once for this pair, or $7 a month for every district in the country.
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