Castroville is the SA metro’s most historically distinctive community — and buying here correctly means understanding three nuances that most buyer guides completely skip: the historic district exterior modification review that applies to properties within the National Register boundary, the Medina River flood zones that affect some creek-adjacent properties, and the honest school district context that shapes both the community’s price accessibility and its buyer pool. Medina Valley ISD’s TEA “D” rating is the primary reason Castroville home prices remain accessible relative to SA metro alternatives at comparable distance from downtown — buyers who understand this and either don’t have school-age children, plan to use private or charter alternatives, or are buying for the community’s historic character and Medina County tax advantage can access one of the metro’s most undervalued markets. This guide covers all three nuances plus the complete Castroville buying process from pre-approval through closing.
Brock Bremmer | Real Estate Agent | eXp Realty | San Antonio Metro Area
West Corridor and Medina County Specialist
Also see: Living in Castroville | Cost of Living in Castroville | Property Taxes Medina County
Step 1: Understand Castroville’s Three Non-Standard Buyer Considerations
1. National Register historic district boundary
Castroville’s National Register of Historic Places designation affects properties within the historic district boundary — primarily in the historic core around Fiorella Street and the early Alsatian settlement area. Properties within the boundary may be subject to exterior modification review requirements if you plan renovations. This is not a prohibition on renovation but an additional approval process. Verify whether your target property falls within the historic district boundary at medinacad.org or with the City of Castroville before planning any exterior modifications. Historic designation can also enable historic tax credits for qualifying renovation projects — consult a CPA familiar with Texas historic property incentives
2. Medina River flood zones
Some Castroville properties near the Medina River and local creek corridors carry FEMA flood zone designations requiring mandatory flood insurance. Verify at msc.fema.gov for any river-adjacent or low-elevation Castroville address before making an offer. Flood insurance premiums of $800–$3,000+ annually represent a meaningful carrying cost addition that standard property tax discussions don’t capture. Flood zone designation also affects conventional financing terms and may limit VA and FHA loan options on affected properties
3. Medina Valley ISD — honest context
Medina Valley ISD holds a TEA “D” rating — the most significant demand variable affecting Castroville home prices. Buyers with school-age children should research private school options (approximately $8,000–$15,000 annually at local private schools) and factor that cost into the total monthly carrying cost comparison. Buyers who don’t have school-age children, plan to homeschool, or are purchasing Castroville specifically for its historic character and Medina County tax advantage are making a financially sound decision — the school district variable that depresses Castroville prices is irrelevant to their purchase calculus
Step 2: Pre-Approval with Medina County’s Tax Rate
- Medina County effective rate: Combined approximately 1.49%–1.71% for most Castroville-area addresses — meaningfully below Bexar County’s 2.2%–2.4%. On a $280,000 Castroville home, approximately $4,172–$4,788 annually versus $6,160–$6,720 at Bexar County’s rate — a $1,988–$1,932 annual savings at the same purchase price
- City vs non-city: Properties within Castroville city limits pay the city municipal rate on top of county and school. Properties in unincorporated Medina County outside city limits pay county and school only — a lower combined rate. Verify city/non-city status at medinacad.org for your target address
- USDA eligibility: Many Castroville and unincorporated Medina County addresses qualify for USDA zero-down financing. Verify at eligibility.sc.egov.usda.gov — income limits apply. See our USDA Loan Guide
Step 3: The Castroville Due Diligence Checklist
- Historic district boundary check — verify with the City of Castroville before planning any exterior renovations
- Flood zone verification at msc.fema.gov — mandatory for any river-adjacent or low-elevation property
- Well and septic (outer addresses): Some Castroville-area properties outside city limits use well and septic — verify utility source and schedule licensed inspections during Option Period. VA and FHA financing require water quality testing on well-served properties
- Tax entity verification at medinacad.org — confirm city/non-city status and complete entity list before finalizing budget
- Ag exemption rollback: Rural and rural-adjacent Medina County properties may have ag exemption history — verify before closing to avoid rollback tax liability transfer
- Foundation inspection: Castroville’s clay soil and Hill Country terrain produce foundation movement — schedule a structural engineer’s report in addition to the general home inspection
- I-35 and US-90 commute test: Castroville sits approximately 25–30 minutes from downtown SA via US-90 West — test during actual rush hours. Lackland AFB is approximately 20–25 minutes
Step 4: Close and File Exemptions
- File Form 50-114 at medinacad.org immediately after closing
- Standard state exemption: $140,000 off school district taxable value (2026)
- Medina County homestead: additional $15,000 off
- City of Castroville homestead (if in city limits): additional $10,000 off with over-65 freeze available
Frequently Asked Questions: How to Buy in Castroville
Are there restrictions on renovating historic homes in Castroville?
Properties within the National Register historic district boundary may require exterior modification review before certain renovations. The review applies to exterior changes visible from public streets — interior renovations are not subject to the same requirements. Verify whether your target property falls within the boundary before closing and confirm the review process with the City of Castroville. Historic designation can enable historic tax credits for qualifying projects — consult a CPA familiar with Texas historic property incentives.
Is Castroville TX USDA eligible?
Many Castroville and unincorporated Medina County addresses qualify geographically for USDA zero-down financing. Verify your specific address at eligibility.sc.egov.usda.gov before making any financing decisions. Income limits and 640 minimum credit score apply. See our USDA Loan Guide.
Ready to Buy in Castroville?
Brock Bremmer with eXp Realty verifies historic district status, flood zone designation, well and septic utility source, ag exemption history, and USDA eligibility for every Castroville transaction.
- 📞 Call or text: 210-501-5088
- 📧 Email: [email protected]
- 📅 Schedule a free consultation
Also see: Living in Castroville | Property Taxes Medina County | Best Agent Castroville