What do you suppose Napans complain about most?

Corked cabernet? Bel Aire Plaza parking? ATMs that speak Spanish? The lack of skating rinks as outlets for young people? Questionable grammar and punctuation in the local newspaper?

Those are popular ones among the readers who add comments to stories on the Napa Valley Register’s Web site.

It turns out that the city of Napa tracks the nature of the complaints it receives.

Napa City Manager Mike Parness left a list of recent complaints when he and Mayor Jill Techel visited the Register editorial board Nov. 20.

So, in honor of my late father’s affinity for the TV game show “Jeopardy,” I’ll ask the question about the no. 1 request for service in the form of a statement: This category of complaint to the city of Napa had the most people feeling as though they were out on a limb …

What is “tree issues,” Alex.

According to data collected by the city, some 150 requests for service between July and September had to do with fallen or dangerous trees.

 Tree calls represented 34 percent of the 445 service requests citizens made via calls, e-mails, by using the city’s Web site or going the old-fashioned route and walking into City Hall.

Coming in second, with 22 percent of the requests, was the category listed as “light out,” a reference to blown fuses or burned-out bulbs on street lights. A basic safety issue.

The rest of the list is more closely clustered. No. three is “dead animal,” a sad call, indeed. The city contracts with the Napa County Sheriff’s Department for animal control services, and the two are negotiating a new deal. The city took one call on that subject every three days.

Fourth is “litter or debris,” barely edging out park issues to round out the top five.

The city can take heart in that it took no calls in one category, pollution, which presumably is distinguishable from litter and debris by toxicity or size.

The city also got few calls for water quality and water pressure concerns, water leaks or tilting or malfunctioning utility poles, nuisances at construction sites or in regard to city landscaping.

The city of Napa also lists its average reaction times to requests for service. The categories that are easiest for the city to resolve include traffic signal malfunctions, graffiti and sign problems.

The city is slowest at rough road complaints and concerns about sidewalks, issues for which this and other cities scramble for money to fund repairs; and drainage problems, another sometimes complex and expensive engineering issue.

Here are the top 10, with percentages of overall calls:

1. Tree issue, 34 percent.

2. Lights out, 22 percent

3. Dead animal, 7 percent

4. Litter or debris, 6 percent

5. Park issue, 5 percent

6. Pothole, 5 percent

7. Bad sidewalk or curb, 4 percent

8. Sign problem, 3 percent

9. Graffiti, 3 percent

10. Street sweeping, 2 percent

* All others, 9 percent