Four species, four different searches
Spending two minutes on identification saves weeks of searching the wrong half of a property, and none of it requires equipment. House flies are the dull grey quarter inch flies that land on everything and gather on sunlit glass. They came from outdoors, so the search is containers, animal waste, and clippings within a short flight of a door. Little house flies are smaller and behave completely differently, hovering in slow loose loops under a patio roof or a carport light without settling. They prefer cooler weather, which is why they show up in spring and autumn. Stable flies look like house flies until one bites you. That single fact redirects the search toward wet decaying plant material rather than garbage. Blow flies are metallic, loud, and arrive as a group. Indoors that means a carcass, which is the one situation on this list that deserves urgency. Add drain flies, which sit motionless on bathroom tile, and fungus gnats, which rise from potting soil, and you have covered nearly every complaint a San Jose household will encounter.
Where the water is on an irrigated San Jose lot
Since the rainfall total in San Jose does not keep anything wet through the dry months, a source hunt is really an audit of your own irrigation and habits. Start with containers. Pull the bag out of the kitchen bin and look at what has collected underneath. Do the same with the green waste container, which routinely holds the wettest organic material on a property. Move to compost. A pile that is turned and heating is a poor breeding site. A pile that sits cool and saturated where it meets the soil is an excellent one, and that edge is where the larvae will be. Then follow the irrigation itself. Leaking emitters buried under mulch, valve boxes holding water, sprinkler heads that pond at the low corner of a lawn, and the permanently damp strip along a shaded fence all qualify. Finish with animal areas, spilled feed, and any pile of clippings left in shade. Indoors, check every drain, the laundry standpipe, the condensate pan, and the soil in every pot.
The San Jose year, season by season
January and February are quiet outdoors but not empty, and they are the ideal months to brush every drain in the house while outdoor pressure is at its lowest. March through May brings the little house fly increase as things warm gently, and mid to late spring is when stable flies begin appearing. This is the window for compost and animal area work, done before the early summer stable fly peak rather than during it. June through September belongs to the house fly. With summer highs averaging 82F, development is steady rather than explosive, which means a missed week is recoverable here in a way it would not be in a hotter climate. October and November bring the second little house fly peak as temperatures fall back into the range that species prefers. People who assumed the season ended in September are often caught out by this. December settles down outdoors. flies indoors during that stretch are drains, plants, or produce, and searching the yard for them wastes the effort.
What a first inspection should actually cover
A good first visit involves more walking and asking than spraying, and you can judge the quality of one while it is happening. Expect questions first: which rooms, what time of day, how long this has been going on, whether anything changed recently such as new landscaping, a new pet, a remodel, or a plumbing repair. Those answers separate indoor sources from outdoor ones before anyone opens a bag. Outdoors, the inspector should look at containers and the ground beneath them, compost, clipping storage, animal areas, and the irrigated zones where leaks pond. On a heavily landscaped lot this takes real time, and an inspection that skips it has skipped the likeliest answer. Indoors, they should run water in each drain, check under sinks, look at the standpipe and condensate pan, and examine potted plants. What you want at the end is a named location and a dated plan. A visit that finishes with a general treatment and a monthly price, without any statement of what is breeding, has not delivered the thing worth paying for.
Four questions that separate two quotes
Identical prices routinely buy very different work, so compare content before totals. Ask what is breeding and where. A proposal that names the compost base, the green waste container, or a specific bathroom drain came from an inspection. One that names a species and a treatment came from a template that would fit any address. Ask how the plan is ordered. UC IPM puts larval site removal first and insecticides last for adults, and a plan that leads with a spray schedule has inverted the guidance you should be following. Ask who removes the material, and how often. Source removal is the part that works, so it should be written down as tasks with a frequency rather than described in one loose sentence that quietly leaves it all with you. Ask about follow up and escalation. Find out how many visits are included, at what spacing, what triggers a free return, and what happens if the source turns out to be a plumbing failure or an animal in a wall.