Un Mar de Colores · El Cajon, CA
Where El Cajon Learns Watershed Science — 100% Free
Water belongs to everyone in El Cajon. Watershed education reclaims the story of who protects it.
Un Mar de Colores's Watershed Explorers program brings El Cajon youth into the full watershed-to-ocean story of San Diego County. Day trips and overnight summer cohorts trace mountain streams from Cuyamaca State Park to the coast, returning to OB Pier (14 miles) and Coronado Central (13 miles) (closest breaks to El Cajon) for ocean-based lessons. We partner with Cajon Valley Union School District / Grossmont Union High and community organizations including Cajon Valley Union School District and El Cajon Library to recruit from Bostonia Elementary, Chase Avenue Elementary, Cajon Valley Middle and other Title I schools. Every program integrates the Tijuana River watershed case study — the only cross-border river in Southern California.
Schedule — El Cajon Program Days
Summer cohorts + year-round school field trips · Completely free
You Might Be Feeling This
- —Your teen asks why the ocean smells after rain — school never mapped the pipeline from El Cajon storm drains to OB Pier (14 miles) and Coronado Central (13 miles).
- —Overnight environmental camps cost $400+ per student — watershed immersion feels impossible for El Cajon working families.
- —Your teacher wants a real field trip but doesn't know free options exist for El Cajon Title I schools.
What Changes When Youth Get in the Water
- NGSS-aligned curriculum supports Cajon Valley Union School District / Grossmont Union High teachers with real field science alignment.
- BIPOC-led environmental education — instructors who reflect El Cajon communities, not tourist eco-guides.
- Hydrology fundamentals taught in the field — flow measurement, runoff tracing, pollution sampling on site.
Why We Run This Program in El Cajon
El Cajon is home to one of the largest Middle Eastern/Chaldean communities in the United States and a 32% Hispanic/Latino population. Our El Cajon cohorts shuttle 14 miles to OB Pier, with cultural programming tailored to the city's unique demographic mix. Cajon Valley Union's Bostonia and Chase Avenue Elementary are our anchor partnerships.
- Population
- 106,215
- BIPOC residents
- 55%
- Spanish-speaking households
- 32%
- Distance to beach
- 14 mi
Watershed Education in El Cajon — What You Should Know
Free watershed education in El Cajon is Watershed Explorers and year-round field trips at Un Mar de Colores — tracing water from Cuyamaca Rancho State Park mountain streams to the San Diego coast. Overnight summer cohorts and Cajon Valley Union School District / Grossmont Union High day trips include bilingual materials, naturalist educators, and transportation at zero cost.
Teachers in Cajon Valley Union School District / Grossmont Union High contact Un Mar to book free year-round field trips — El Cajon classrooms access mountain-to-coast science without PTA fundraising.
Why El Cajon Matters to Our Mission
Whether El Cajon is on the coast or 14 miles inland inland, we treat transportation as part of the program — not an extra parents must figure out. That's how you build real access, not marketing copy.
The ocean off El Cajon belongs to everyone. Un Mar de Colores exists because San Diego has spent decades telling BIPOC youth otherwise — and we're changing that story one cohort at a time.
Local El Cajon Partners & Referral Sources
In partnership with Cajon Valley Union School District / Grossmont Union High and local community organizations, we recruit youth from 4+ Title I schools.
School district & Title I partners
- Cajon Valley Union School District / Grossmont Union High
- •Bostonia Elementary
- •Chase Avenue Elementary
- •Cajon Valley Middle
- •El Cajon Valley High
Community partners
- ◆Cajon Valley Union School District
- ◆El Cajon Library
- ◆Chaldean American Chamber of Commerce
- ◆Grossmont College (student volunteers)
Program Curriculum
The Watershed Explorers program is Un Mar de Colores's flagship environmental education offering. Summer overnight cohorts trace the journey from Cuyamaca Rancho State Park's mountain streams to the San Diego coast, with special focus on the Tijuana River watershed — California's most cross-border and pollution-impacted river system. Curriculum integrates hydrology fundamentals, Indigenous Kumeyaay perspectives on water, and California coastal policy. Year-round day trips serve school field-trip groups across our 15+ Title I partner schools, and all programming is free with transportation included.
- →Hydrology fundamentals
- →Cuyamaca to coast watershed tracing
- →Tijuana River cross-border watershed case study
- →Indigenous Kumeyaay relationship with water
- →Climate change and coastal resilience
- →Policy and advocacy for clean water
What's Included — Free for Every El Cajon Youth
- ✓Overnight summer program option (Watershed Explorers)
- ✓Day-trip school field trips throughout the year
- ✓Bilingual curriculum materials
- ✓Transportation from partner schools
- ✓Certified naturalist educators
- ✓Family engagement opportunities
Why Un Mar de Colores
Un Mar de Colores is recognized by partners including the San Diego Foundation, Surfrider San Diego, WILDCOAST, and school districts across San Diego — not a pop-up program, a sustained movement.
What our community says
“"He used to approach new activities with extreme anxiety — to the point where sometimes we couldn't even get out of the car. Now he goes much deeper into the water."”
Frequently Asked Questions — Watershed Education in El Cajon
What do students learn about climate change?+
Climate change and coastal resilience modules connect global patterns to El Cajon beaches — storm intensification, sea level rise, and advocacy for clean water policy. Students learn organizing tools, not hopeless anxiety.
Where do field trips go from El Cajon?+
Sites progress from Cuyamaca mountain streams through river and estuary systems to coastal locations near OB Pier (14 miles) and Coronado Central (13 miles). Multi-site tracing shows the full watershed pipeline relevant to San Diego.
How is watershed education different from aquarium field trips?+
Aquarium trips show marine life in tanks. Watershed education traces the full pipeline — students stand in mountain streams, visit estuaries, and connect runoff from El Cajon to conditions at OB Pier (14 miles) and Coronado Central (13 miles). Field science with advocacy depth.
Are watershed education in El Cajon really free?+
Yes. All Un Mar de Colores programs in El Cajon are 100% free — including 3/2mm wetsuits, soft-top surfboards, transportation from partner schools like Bostonia Elementary, Chase Avenue Elementary, Cajon Valley Middle, and certified bilingual instruction. Funding comes from the San Diego Foundation, community grants, and individual donors. No El Cajon family has ever paid for our programming.
Where exactly do watershed education happen in El Cajon?+
El Cajon is 14 miles inland from the coast, so our cohorts are shuttled to OB Pier (14 miles) — our nearest Un Mar teaching beach. Classroom components including curriculum, cultural arts, and tutoring happen at Cajon Valley Union School District and partner schools inside El Cajon.
What ages can enroll in El Cajon?+
We serve youth ages All ages. In El Cajon specifically, our recruitment runs through Cajon Valley Union School District / Grossmont Union High — with priority enrollment for students from Bostonia Elementary, Chase Avenue Elementary, Cajon Valley Middle and 1 other Title I schools. Cohorts are age-appropriate (One Ocean for 6–12, Ocean Stewards for 13–17).
Does my child need to know how to swim before starting?+
No. We begin every cohort with ocean-safety fundamentals in chest-deep whitewater at OB Pier (14 miles), supervised by instructors certified by the San Diego Fire-Rescue Lifeguard Division. Water comfort is built progressively. In El Cajon, we also run pre-cohort pool-familiarization sessions at inland pools via our Cajon Valley Union School District partnership for students who request extra comfort-building.
Are lessons taught in Spanish in El Cajon?+
Yes. All Un Mar de Colores programs are bilingual — and in El Cajon, where 32% of households are Spanish-speaking, we intentionally pair at least one bilingual coach to every session. Cultural programming is delivered in both languages, and parent communications are always sent in Spanish and English.
How is Un Mar de Colores different from other watershed education in El Cajon?+
Three ways: (1) everything is free, while most El Cajon surf programs charge $50–$150 per lesson; (2) we are BIPOC-led and our coaches reflect the 55%-BIPOC El Cajon community we serve; (3) our curriculum includes environmental justice, Kumeyaay coastal history, and cultural arts — not just surf skills. We exist because the ocean should belong to everyone in El Cajon, not just those who can afford access.
How do I sign my El Cajon child up?+
Visit our sign-up page or contact us directly. Priority enrollment goes to students of Bostonia Elementary, Chase Avenue Elementary, Cajon Valley Middle and referrals from Cajon Valley Union School District and El Cajon Library. Summer cohorts fill 3–4 weeks before start, so early contact is recommended.
Ready to Get in the Water?
Free means free. No hidden fees, no gear costs, no transportation charges for El Cajon participants.
All Un Mar de Colores programs are free for El Cajon youth. Reach out to enroll, volunteer, or support the movement.
Un Mar de Colores is a BIPOC-led 501(c)(3) nonprofit based in Oceanside, California. We provide free surf, ocean, and environmental programming for youth across San Diego and Tijuana — bridging cultures, coasts, and communities since 2018.
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