Inside the metros we cover sit 36 California counties. Every one has a page here — its pest pressure, its place in its metro, and the services that reach it.
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Coverage in California is organised county by county: 36 of them, roughly 98,677 square miles in all, tied to the Los Angeles, Riverside–San Bernardino, San Francisco, San Diego, Sacramento, San Jose metro areas. That is the scale pest services actually run at — state licensing above, county and metro routes below — so each county below gets its own page: its pest pressure, its position in its metro, and the guides that serve it.
The counties around a metro's core are often where the pressure is most interesting — newer subdivisions built into former farmland and woodland meet established pest populations at the edge, while the urban core deals with the pests of density. Each county page reads its own position in that pattern.
By land, the covered counties run from San Bernardino County (20,068 sq mi), Kern County (8,135 sq mi), Riverside County (7,209 sq mi) down to San Francisco County at about 47 square miles. The metros anchoring coverage are Los Angeles (metro population 12,844,441; 2 covered counties in California); Riverside–San Bernardino (metro population 4,769,007; 2 covered counties in California); San Francisco (metro population 4,630,041; 5 covered counties in California); San Diego (metro population 3,282,248; 1 covered county in California); Sacramento (metro population 2,477,274; 4 covered counties in California); San Jose (metro population 1,984,473; 2 covered counties in California); Fresno (metro population 1,203,383; 2 covered counties in California); Bakersfield (metro population 927,068; 1 covered county in California); Oxnard–Ventura (metro population 830,851; 1 covered county in California); Stockton (metro population 823,815; 1 covered county in California); Modesto (metro population 557,719; 1 covered county in California); Santa Rosa (metro population 486,444; 1 covered county in California); Visalia (metro population 485,146; 1 covered county in California); Vallejo (metro population 455,376; 1 covered county in California); Santa Barbara (metro population 442,065; 1 covered county in California); Salinas (metro population 433,729; 1 covered county in California); Merced (metro population 297,260; 1 covered county in California); San Luis Obispo (metro population 282,367; 1 covered county in California); Santa Cruz (metro population 258,852; 1 covered county in California); Chico (metro population 209,211; 1 covered county in California); Yuba City (metro population 187,478; 2 covered counties in California); Redding (metro population 181,648; 1 covered county in California); El Centro (metro population 181,411; 1 covered county in California); Hanford (metro population 154,327; 1 covered county in California). Hold those two scales together — the county's land and the metro's weight — and the county pages below read plainly: pressure follows the metro, exposure follows the land, and providers plan for both.
The state's pest calendar is anchored by its largest metro, Los Angeles: about 12 inches of precipitation a year, an average temperature near 66°F, roughly 39 days at 90°F or above and 0 days at or below freezing. Every county in this index lives inside that weather pattern, adjusted by its own distance from the metro core.
The pest signature across California runs through desert, mediterranean country, and the names that recur on county pages statewide are bark scorpions, drywood termites, roof rats, Argentine ants. The largest covered county in the state is San Bernardino County at about 20,068 square miles, served through the Riverside–San Bernardino metro. For metro-level guides, see the California state page.
The communities county residents actually name: Los Angeles (about 3,857,897 residents), San Diego (about 1,385,061 residents), San Jose (about 990,054 residents), San Francisco (about 836,321 residents), Fresno (about 543,615 residents), Sacramento (about 524,802 residents) are the largest covered communities on this index; each sits inside one of the counties above, and its county page carries the local pest reading for that ground.
Los Angeles — 12,844,441 residents, 2 counties. First on its watch list: bark scorpions, then drywood termites and roof rats — the pattern of a metro where extreme summer heat, very low rainfall and pests adapted to shelter in and around homes.
Riverside–San Bernardino — a metro of 4,769,007 across 2 counties, where the watch list runs bark scorpions, drywood termites, roof rats — the standing pattern where extreme summer heat, very low rainfall and pests adapted to shelter in and around homes.
San Francisco — 4,630,041 residents, 5 counties. First on its watch list: Argentine ants, then drywood termites and roof rats — the pattern of a metro where dry summers, mild wet winters and year-round moderate temperatures pests can work with.
San Diego — a metro of 3,282,248 across 1 counties, where the watch list runs Argentine ants, drywood termites, roof rats — the standing pattern where dry summers, mild wet winters and year-round moderate temperatures pests can work with.
Sacramento — a metro of 2,477,274 across 4 counties, where the watch list runs Argentine ants, drywood termites, roof rats — the standing pattern where dry summers, mild wet winters and year-round moderate temperatures pests can work with.
San Jose — a metro of 1,984,473 across 2 counties, where the watch list runs Argentine ants, drywood termites, roof rats — the standing pattern where dry summers, mild wet winters and year-round moderate temperatures pests can work with.
Fresno — a metro of 1,203,383 across 2 counties, where the watch list runs bark scorpions, drywood termites, roof rats — the standing pattern where extreme summer heat, very low rainfall and pests adapted to shelter in and around homes.
Bakersfield — a metro of 927,068 across 1 counties, where the watch list runs bark scorpions, drywood termites, roof rats — the standing pattern where extreme summer heat, very low rainfall and pests adapted to shelter in and around homes.
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