Marin Horizon School
Marin Horizon School is a licensed child care center in Mill Valley, CA, licensed for up to 110 children and serving preschool-age children. It has held its California license since 1992. Since February 2021, state licensing staff have inspected it 4 times. The state issued 1 citation, 0 of them Type A (the most serious). None came in the last 12 months. Measured by weighted citations per inspection, it is tied for #10 of 17 centers in Mill Valley and has fewer citations per inspection than 61% of California licensed centers.
Inspection record
Every state visit
What inspectors cited most
Citations, newest first
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.
How common are lead-in-water citations in California? See the county-by-county report →
About this center
Common questions
Does Marin Horizon School take infants?
Not under this license, which covers preschool-age children.
Has Marin Horizon School had any serious violations?
No Type A citations since 2021. It has 1 Type B citation, listed above.
How does Marin Horizon School compare with other daycares in Mill Valley?
It is tied for #10 of 17 centers in Mill Valley by weighted citations per inspection, and has fewer citations per inspection than 61% of California licensed centers with enough inspection history to compare.
When was Marin Horizon School last inspected?
Oct 15, 2025. No citations were issued during that visit.
How much does Marin Horizon School cost?
California does not publish individual centers’ prices, so ask Marin Horizon School for its current tuition. For comparison, the median full-time price at licensed centers in Marin County, which includes Mill Valley, was $1,683 a month for preschoolers (about $2,120 today) in the state’s 2021 Regional Market Rate Survey.
Who runs Marin Horizon School?
The licensee is Marin Horizon School, INC, and the administrator listed with the state is Site Dir. Catherine Hills.
Licensed centers nearby
270 Miller Ave, Mill Valley · 0.3 mi away · 21 spotsMore citations than mostGuidepost Montessori At Mill Valley
270 Miller Ave, Mill Valley · 0.3 mi away · 25 spotsAbout typicalLittle School
285 Miller Avenue, Mill Valley · 0.3 mi away · 45 spotsNo citationsMarin Horizon School- Toddler Bldg.
247 Miller Avenue, Mill Valley · 0.3 mi away · 18 spotsAbout typicalMarin Day Schools - Park School Campus Eds
360 East Blithdale Avenue, Mill Valley · 0.6 mi away · 36 spotsNo citationsOld Firehouse School Mill Valley-preschool
10 Olive Street, Mill Valley · 0.7 mi away · 40 spotsNo citations
Citations are quoted from California Department of Social Services inspection and complaint reports. Type A citations are the state’s most serious category (an immediate risk to children’s health, safety or personal rights); Type B citations are a potential risk. A citation is a finding about one rule, not a judgment about a center overall. Complaint allegations appear here only when the state substantiated them.
To read the full state reports, search facility number 210111309 on the California Care Facility Search. Data refreshed Oct 3, 2026.