Karina Somenzari, REALTOR®, is a San Diego County real estate agent for buyers and sellers in all 18 incorporated cities and the unincorporated communities, in English or Portuguese; contracts and escrow documents are in English. For any address, check the jurisdiction, school districts, Mello-Roos and HOA charges, and coastal, fire, flood and airport zones.
General information only, not legal advice. See the note near the end of this page.
Outside the 18 cities, the County government provides what a city typically would, such as law enforcement, fire protection, roads, parks, libraries and building permits, though some communities have their own fire protection district. County plans and rules apply there, including ADU rules; check zoning with the County's Property Summary Report. Inside the City of San Diego, use the City's Zoning page.
Nine cities contract with the County Sheriff for law enforcement through July 2027: Del Mar, Encinitas, Imperial Beach, Lemon Grove, Poway, San Marcos, Santee, Solana Beach and Vista.
The 18 incorporated cities by 2020 Census population:
Some addresses have separate elementary and high school districts. Only the district or school can confirm boundaries.
Mello-Roos (CFD)
A special tax lien for things like schools and roads, levied by cities, school districts, fire districts, the County and others. Check the tax bill, the seller's notice and the County's list for FY 2025-2026.
HOA
The seller gives you the governing documents and a statement of current regular and special assessments.
Coastal zone
Development generally needs a coastal development permit too. Map: Coastal Zone Boundary.
Fire hazard zone
The maps rate hazard, not risk. For a home in a High or Very High zone, the seller provides defensible-space documentation where a local ordinance or inspection provides it; otherwise, buyer and seller agree in writing that the buyer will get it. Maps: CAL FIRE's viewer and, in the City of San Diego, the City's map.
Flood zone
FEMA's A and V zones have at least a 1-percent chance of flooding in any given year. Where NFIP flood insurance is available, federally regulated lenders require it there for the loan's term. Map: Flood Map Service Center.
Airport influence area
All 15 public-use and military airports in the county have one. Plans such as Oceanside's and MCAS Miramar's divide it into Review Area 1 (noise and safety zones) and Review Area 2 (airspace and overflight). Anywhere inside, the hazard report includes a Notice of Airport in Vicinity. Entries below name some, not all. See the Airport Land Use Commission.
The free property report pre-checks fire, flood and fault zones; the seller's Natural Hazard Disclosure states them for the home.
City fire zones come from CAL FIRE's local map dated March 24, 2025, which local agencies must adopt and may add to but not lower. Unincorporated land also has State Responsibility Area zones (map adopted January 31, 2024). Entry acreage is CAL FIRE's 2025 figure, before local additions.
Coastal North County
Oceanside
Status: incorporated city next to Marine Corps Base Camp Pendleton.
Check: Oceanside Municipal Airport's influence area, FEMA Zone A99 along the San Luis Rey River valley, City CFDs such as 2000-1 Ocean Ranch, and 2,597 Very High fire acres.
Check: a large part is in the coastal zone, and noise contours from McClellan-Palomar, a County airport in the city, cross part of it. City CFD No. 3 debt service runs through 2036 (Improvement Area 1) and 2038 (Improvement Area 2) on the current schedule. 8,170 Very High fire acres.
Check: nearly all of the city is in the coastal zone, where development generally needs a coastal development permit. Both school districts levy CFDs on the County's list, so check the tax bill. 149 Very High fire acres.
Check: all or nearly all of the city is in the coastal zone. FEMA flood hazard areas cover a large share, including Zone AE near the fairgrounds. 441 Very High fire acres.
Check: within the Rancho Santa Fe Protective Covenant, a private Art Jury reviews development and building applications, and plans must show County approval. Fire zones are State Responsibility Area, mostly High, the rest largely Very High. Rancho Santa Fe CFD #1 is on the County's list.
Status: incorporated city. Naval Base Coronado facilities the Navy lists at Coronado include Naval Air Station North Island, Naval Amphibious Base Coronado and the Silver Strand Training Complex.
Check: no fire hazard zone on CAL FIRE's 2025 map. FEMA VE and AE zones along the shoreline and North Island noise contours over part of the city. NAS North Island's influence area covers much of the city. No City CFD is on the County's list; check the tax bill for other agencies' CFDs.
Check: the City's own fire map (Ordinance O-21992, adopted in July 2025, effective August 30, 2025) adds Very High areas the State hadn't mapped; check the City's map. City CFDs on the County's list: No. 2 (Santaluz), No. 3 (Liberty Station) and No. 4 (Black Mountain Ranch Villages).
La Jolla to Point Loma:San Diego Unified. A 30-foot height limit applies west of Interstate 5, with exceptions (Proposition D, effective December 7, 1972). San Diego International's influence area covers all of Ocean Beach.
Downtown to Kearny Mesa: mostly San Diego Unified. Montgomery-Gibbs Executive Airport's influence area covers all of Kearny Mesa.
North:Poway Unified in Rancho Bernardo, Rancho Peñasquitos and Del Sur (its CFD 14); San Dieguito Union High in Carmel Valley. MCAS Miramar's influence area covers nearly all of Mira Mesa and most of University City.
South:Sweetwater Union High in San Ysidro and Otay Mesa. Brown Field's influence area covers nearly all of Otay Mesa.
Check: City CFDs for newer developments include 2020-2 The Villages (formed May 13, 2020) and 2022-1 Eclipse/Mountain House (formed March 2, 2022). 11,082 Very High fire acres, third-most among the 18 cities.
Check: many City CFDs, including 99-01 (San Elijo Hills), 2002-01 (University Commons) and 88-1 (Paloma/Santa Fe Hills), taxed yearly for bond debt or City services. San Marcos Unified levies its own CFDs and posts disclosure documents. 8,416 Very High fire acres, roughly half the city's land.
Check: Oceanside Municipal Airport's influence area reaches into Vista. No City CFD is on the County's list; check the tax bill for other agencies' CFDs. 1,658 Very High fire acres.
Check: 19,923 acres, most of the city's land, are Very High on CAL FIRE's 2025 map. MCAS Miramar's influence area covers about half the city. Poway Unified uses CFDs for schools in newer areas (37 entries on the County's list).
Status: unincorporated, with its own County community plan. It sits next to Camp Pendleton and Naval Weapons Station Fallbrook, a Camp Pendleton tenant.
Check: a large share is State Responsibility Area land mapped Very High, plus Very High land on the local map. The County's airport system includes Fallbrook Airpark.
Check: most of it is State Responsibility Area land mapped Very High. The County's list shows CFDs from Valley Center-Pauma Unified, the Valley Center Fire Protection District and the Valley Center Municipal Water District.
Status: unincorporated master-planned community in the County's San Dieguito community plan area. The Census Bureau has no 4S Ranch place, so there is no official population count. Mail uses ZIP code 92127 with a San Diego mailing city, though it sits outside the City of San Diego.
Check: the Rancho Santa Fe Fire Protection District provides fire protection. Poway Unified's Mello-Roos tax (CFD No. 6) and the fire hazard zone on CAL FIRE's 2025 map depend on the address.
Check: Montgomery-Gibbs Executive Airport's influence area covers nearly all of the city. No Very High fire land on CAL FIRE's 2025 map, but 243 acres of High and 67 of Moderate. No City CFD is on the County's list; check the tax bill for other agencies' CFDs.
Check: Gillespie Field's influence area covers about two-thirds of the city, and its noise contours cross parts. No City CFD is on the County's list; check the tax bill for other agencies' CFDs. 319 Very High fire acres.
Check: Gillespie Field's influence area covers about two-thirds of the city, and MCAS Miramar's includes land in it. City CFDs 2015-1 and, for Weston, 2017-1 and 2017-2. 6,170 Very High fire acres; the City's fire zone page has an address search.
Check: no Very High fire land on CAL FIRE's 2025 map, with 22 acres of High and 27 of Moderate. Montgomery-Gibbs Executive Airport's influence area covers about a quarter of the city. The County's list includes the City's Main St Promenade CFD 2013-1.
Check: Very High land on State and local fire maps; FEMA AE zones along the San Diego River corridor. Gillespie Field's influence area covers nearly all of Bostonia.
Check: more than half is State Responsibility Area land mapped Very High. For a home in that zone, the defensible-space rule in the table above applies, and the Natural Hazard Disclosure states the zone.
Check: most of it is State Responsibility Area land mapped Very High. Ramona Airport, part of the County's airport system, has noise contours over part of the community.
Check: most addresses use an El Cajon, CA 92019 mailing address, but the community is not inside the City of El Cajon. San Miguel Fire and Rescue lists it in its service area.
Check: mailing addresses use ZIP codes 91941, 92019, 92020 and 91977, so a home can show a La Mesa, El Cajon or Spring Valley mailing city while it sits in the unincorporated County.
Check: most of Julian is mapped Very High on CAL FIRE's State Responsibility Area fire hazard map. The Julian Community Services District supplies water to a 271-acre area of downtown only, so ask which water and sewer arrangements apply to a parcel elsewhere.
Jamul and Dulzura: unincorporated community in southeast San Diego County with 6,179 residents at the 2020 Census. The County's Jamul/Dulzura Subregional Plan guides land use. Read the guide
Crest and Dehesa: unincorporated communities east of El Cajon and west of Alpine. Crest had 2,828 people at the 2020 Census. Read the guide
Harbison Canyon: unincorporated community with 4,048 residents at the 2020 Census. It uses El Cajon mailing addresses but is not part of the City of El Cajon. Read the guide
Granite Hills: unincorporated community east of El Cajon with 3,267 people at the 2020 Census. Part of it sits inside the City of El Cajon, so check whether an address is in the County or the City. Read the guide
Bostonia: unincorporated community just north of El Cajon. The Census Bureau counted 16,882 people there in 2020, and nearly all of it sits inside Gillespie Field's airport influence area. Read the guide
Blossom Valley: named locality in unincorporated San Diego County, east of Lakeside, governed by the County. The Lakeside Fire Protection District provides fire and medical response. Read the guide
Borrego Springs: unincorporated community in the Borrego Valley, surrounded by Anza-Borrego Desert State Park, with 3,073 residents at the 2020 Census. The Borrego Water District serves water and sewer. Read the guide
East County Backcountry: Descanso, Pine Valley, Guatay, Mount Laguna, Campo, Potrero, Boulevard, Jacumba Hot Springs and Lake Morena are all unincorporated, so the County handles building permits, roads and parks. Read the guide
Check: eastern Chula Vista has Mello-Roos CFDs; the County's 2025-2026 list shows 33 City entries, many named for Otay Ranch villages and Eastlake. The City also levies yearly landscape assessments in its 36 Open Space Districts and associated zones; check the tax bill. 8,939 Very High fire acres.
Check: no fire hazard zone on CAL FIRE's 2025 map. The bayfront is in the coastal zone. NAS North Island's influence area covers part of the city. No City CFD is on the County's list; check the tax bill for other agencies' CFDs.
Check: the landing field's influence area covers the whole city. Most of the city is in the coastal zone, and FEMA AE and VE zones cover a sizable share of its mapped area. 84 Very High fire acres.
Check: FEMA A zones cover part of Bonita, including land along the Sweetwater River valley. Most of it is non-wildland on CAL FIRE's 2025 local map. NAS North Island's influence area covers nearly all of it.
Which parts of San Diego County does Karina Somenzari work in?
All of it. Karina Somenzari works with buyers and sellers in all 18 incorporated cities and the unincorporated communities, in English or Portuguese. Contracts and escrow documents are in English.
Are Fallbrook and Ramona their own cities?
No. Both are census designated places: named, unincorporated communities with no city government. The County provides most city services there, and each has its own County community plan. Lakeside, Alpine, Spring Valley, Valley Center, Bonita and Rancho Santa Fe are unincorporated too.
Which agencies levy Mello-Roos taxes in San Diego County?
Cities, school districts, fire districts, water and service districts, the County and statewide financing authorities all levy them, and the County Auditor's list groups active districts by agency. A city's districts may cover only part of it, and other agencies' districts can apply anywhere, so don't assume an area has none. For the step-by-step check on a specific home, see the property report page.
Which parts of San Diego County are in fire hazard severity zones?
Large parts. CAL FIRE's 2024-2025 maps show 1,011,865 acres in the county as Very High, 181,592 as High and 465,375 as Moderate, counting State and Local Responsibility Areas before local additions. Among the 18 cities, only Coronado and National City show no zone on the 2025 local map.
Can an ADU be sold separately from the main house?
In unincorporated communities, it can be, if the project meets the County's eligibility requirements for a condominium conversion under a program the County Board of Supervisors adopted March 4, 2026. Inside one of the 18 cities, ask that city; state law (Assembly Bill 1033) lets cities and counties create their own programs. For building costs, see the San Diego ADU pricing guide.
General information, not legal advice. This page summarizes official sources as of October 2026. Maps, school boundaries and special-tax lists change, and coverage descriptions are approximate. For a specific home, rely on its disclosures and current maps, confirm schools with the district, and ask an attorney, tax advisor or insurance agent about legal, tax or flood insurance questions. Karina Somenzari is a real estate agent licensed in California, not an attorney, insurance agent or tax advisor.
Karina offers a free, no-pressure conversation in English or Portuguese. Send her an address and she'll go over these checks with you, or email karinahomes@outlook.com.