Every market figure on this site should be traceable to a source and honest about how sure we are of it. This page explains where the numbers come from, what our confidence labels mean, and how to tell us when something looks wrong.
The one rule: a number you can trace, with a confidence you can see
Real estate content on the open web is full of confident-sounding figures with no source and no date. We do the opposite. The governing rule across this site is simple: a market figure should be traceable to a source, labeled with how confident we are, and dated — and where we cannot be confident, we say so rather than inventing precision.
Single source of truth
For the cities we track most closely, every page reads its median from one canonical dataset rather than each page carrying its own number. That is deliberate: it means the median you see on the Simi Valley overview, a Simi neighborhood page, and a Simi calculator all agree, because they all read the same value. When that canonical figure is refreshed, it updates everywhere at once.
Confidence labels
Every market figure is tagged with one of three confidence levels. You will see these labels in the "Market data & confidence" callout near the top of each city and neighborhood page.
| Label | What it means | How to treat it |
|---|---|---|
| High | From our canonical CRMLS-derived dataset for a city we actively track. | Reliable as a snapshot. Still for an exact period or street. |
| Medium | From a published source — a public portal, or a specific ZIP — that varies by source and reporting window. | Use as a directional figure. Confirm with a live, dated set before acting. |
| Low | A small or thin market where no single median is statistically reliable. Shown as a range, or with a "pull a live comp set" note. | Treat the range as context only. A property-specific comp set is the real answer. |
Named sources and publication rules
Market medians for Los Angeles and Ventura County cities come from the Chicago Title Market Trend Report (monthly full-value sales, compiled from MLS and public recorded data), and the city figure we cite is that report’s own CITY TOTAL row. Santa Barbara–area communities come from the Santa Barbara Association of REALTORS® monthly Chart Summary (“2026 MLS Market Activity,” houses/PUDs only, with active, pending, and months-of-supply figures). Kern County comes from the California Association of REALTORS® county sales-and-price series. We apply a twelve-sale floor: below twelve closed single-family sales in the window we publish the count and the range, not a median — one sale would move it more than the market does. Because a county report’s CITY TOTAL row is an unweighted average of ZIP medians, wherever a thin ZIP distorts it we publish the ZIP table instead of one citywide number and say so on the page. The Chicago Title cycle refreshes monthly and the SBAOR Chart Summary monthly; every figure on this site carries its source name and data window inline, and portal figures (Redfin, Zillow) appear only as labeled cross-checks, never as our own.
Source of truth, by data type
Different facts come from different authorities. This is the same table you will find at the bottom of each city page, in one place:
| Data type | Source of truth | Confidence |
|---|---|---|
| Market (median, days on market, list-to-sale, $/sqft) | CRMLS / regional MLS (Conejo Simi Moorpark Association of REALTORS® for Ventura County); public portals as cross-check for secondary markets | HIGH where canonical; MEDIUM where portal-derived for an exact period |
| Schools & districts | California Department of Education (CDE) / California School Dashboard | HIGH — verify the assigned school by address |
| Wildfire hazard | CAL FIRE Fire Hazard Severity Zones | HIGH — verify the specific parcel |
| Flood zone | FEMA National Flood Hazard Layer (NFHL) | Verify per parcel |
| Parcel, taxes & Mello-Roos / CFDs | County Assessor (Ventura, Los Angeles, or Kern as applicable) | Verify per parcel — Mello-Roos amounts are tract-specific |
| Demographics & population | U.S. Census American Community Survey (ACS) | HIGH where cited |
What we will not do
We do not invent local figures. If a neighborhood is too small to have a reliable median, we say "no single median is reliable — pull a live comp set" instead of printing a made-up number. We do not state Mello-Roos dollar amounts by tract unless they are verified against the county. We do not claim a school is "the best" or a neighborhood is "the safest" — those are not facts we can source, and fair-housing law is clear that steering language has no place in real estate marketing. Where the data is thin, the honest answer is the useful one.
Fair housing
This site describes places using neutral, data-only language. We do not characterize neighborhoods by the people who live there, and we present schools by district and verifiable performance source rather than subjective praise. Brian Cooper is committed to equal housing opportunity and serves all buyers and sellers without regard to race, color, religion, sex, disability, familial status, or national origin.
Spot an error? Tell us.
If a figure looks wrong, stale, or unsourced, we want to know — it makes the whole site better. Email brian@cooperfamilyrealestate.com or call (805) 723-2498 with the page URL and the figure in question. Confirmed corrections are logged to our internal Known Errors Registry and the fix is applied across every page that shares the figure — not just the one you spotted. That registry is how a single catch becomes a permanent improvement.
Frequently Asked Questions
Where do the home prices on this site come from?
Market figures are derived from CRMLS and the regional MLS for Ventura County (Conejo Simi Moorpark Association of REALTORS®), reconciled against a single canonical data file so the same median appears consistently across every page for a given city. Public portals such as Redfin and Zillow are used as cross-checks for secondary markets.
What do the HIGH, MEDIUM, and LOW confidence labels mean?
HIGH means the figure comes from our canonical CRMLS-derived dataset for a tracked city. MEDIUM means a published source that varies by source and reporting window. LOW means the market is small or thin enough that no single median is reliable, so we show a range or direct you to pull a live comp set.
How current is the data?
Each page carries a Last updated date. A median is a snapshot, not a live feed. For any transaction decision, pull a live, dated MLS set for the exact period, price band, and street.
How do I report an error?
Email brian@cooperfamilyrealestate.com or call (805) 723-2498 with the page and the figure. Confirmed corrections are logged to our internal Known Errors Registry and the fix is applied across the site.
Is this market data professional advice?
No. Brian Cooper is a licensed REALTOR®, not an attorney, CPA, or lender. Tax, legal, and loan questions should go to the appropriate licensed professional. Market figures are general information, not a guarantee of value for any specific property.
Brian Cooper is a licensed REALTOR®, not an attorney, CPA, or lender. Tax, legal, and loan questions should go to the appropriate licensed professional. Equal Housing Opportunity.
