Mill Valley · Licensed center
Marin Horizon School
At a glance
- Large center, licensed for 110 children.
What the state has found
The state cited rules at 1 of its 4 licensing inspections since June 2022.
See each inspection
Licensing inspections
- Oct 15, 2025Nothing cited
Aug 27, 20241 citation
HSC 1597.16(a)(1)Type B
“(1) A licensed child day care center, as defined in Section 1596.76, that is located in a building that was constructed before January 1, 2010, shall have its drinking water tested for lead contamination levels on or after January 1, 2020, but no later than January 1, 2023, and every five years after the date of the initial test. This requirement is not met as evidenced by: Based on record review, the licensee did not comply with the section cited above by not testing its fixtures for lead before the deadline of 1/1/2023 which posed a potential health, safety or personal rights risk to persons in care.”
HSC 1597.16(a)(1)
- Oct 10, 2023Nothing cited
- Jun 16, 2022Nothing cited
The state cited rules at 1 of this center's 4 inspections. Bay Area centers inspected 4 times split three ways: 41% had fewer, 38% the same, and 21% more (569 centers).
How all 569 Bay Area centers inspected 4 times compare
Of the 569 Bay Area centers the state inspected 4 times, how many of those inspections cited a rule:
- None41%
- 1 of 438%This center
- 2 of 415%
- 3 of 46%
- All 41%
Read every record and the state’s reports
State record — California CDSS Community Care Licensing
- Last visit
- October 15, 2025
- On file
- 4 visits since June 2022 — 3 cited nothing
- Most serious
- No finding carrying a severity level in the last 24 months.
California CDSS publishes the full investigation narrative for a complaint, including its disposition, and classifies a citation Type A — an immediate risk to a child — or Type B.
Aug 2024 Licensing visit 1 finding
Licensing visit · August 27, 2024
HSC 1597.16(a)(1) · Type B
(1) A licensed child day care center, as defined in Section 1596.76, that is located in a building that was constructed before January 1, 2010, shall have its drinking water tested for lead contamination levels on or after January 1, 2020, but no later than January 1, 2023, and every five years after the date of the initial test. This requirement is not met as evidenced by: Based on record review, the licensee did not comply with the section cited above by not testing its fixtures for lead before the deadline of 1/1/2023 which posed a potential health, safety or personal rights risk to persons in care.
Shortlist replaces people’s names in the state’s text with initials. This is done by rule, not by hand, so it can miss a name or shorten a word that isn’t one. The state’s report, linked on each row, has the original.
Details
- Phone
- (415) 388-8408
- Address
- 305 Montford Avenue, Mill Valley, 94941
- License
- 210111309
We couldn’t find some information that may matter to your decision: openings, child care subsidies, cost, hours and late pickup, teaching approach, ratios and staff, a typical day, sick and biting policies, and who owns it. We can ask the program for you and copy you in.
Sources and dates
Where every fact on this page came from, and when Shortlist last checked it against that source. Anything Shortlist could not source is named here rather than left blank.
All checked November 2026.
State record
From California CDSS Community Care Licensing’s published reports, last checked November 5, 2026.
Details
- Phone, Address, License ccld.dss.ca.gov
Large means the biggest quarter of Bay Area’s 439 licensed centers by state-licensed capacity: 76 to 312 children. Small is 8 to 30; medium is 31 to 75.