Does publishing inspection records improve food safety?

Greenwich Dining Record was built on a simple premise: public restaurant inspection records are more useful when the public can actually find, understand and compare them. That raises a harder question. Does making inspection information more visible accomplish anything?

A number of cities and counties have tried public disclosure, from searchable inspection databases to letter grades posted at the door. Researchers have studied several of these programs, above all in New York City and Los Angeles County. The evidence on restaurant compliance and consumer behavior is encouraging. The evidence that disclosure directly reduces foodborne illness is more complicated.

Restaurants appear to respond to disclosure

The largest study looked at New York City's letter-grade program, introduced in July 2010. Researchers at the city's health department analyzed inspections of 43,448 restaurants between 2007 and 2013. Three years into the program, restaurants were 35% more likely to score in the A range than they had been three years before it. The share receiving an A-range score on an initial inspection rose from roughly 31% when grading began to 46% in 2013, and specific practices improved too, such as having a certified kitchen manager present and keeping pests out. Restaurants sent for reinspection became more likely to have fixed the problem before the inspector returned.¹

One caveat matters. New York did not simply publish information that had been hidden. The same program changed inspection frequency, fines and training, so the researchers could not separate the effect of diners seeing grades from the rest of the enforcement package. Still, the results fit a straightforward idea: when inspection performance is visible to customers, a restaurant has one more reason to improve it.

Diners appear to use the information

Disclosure only creates that incentive if diners care. In New York they apparently did. In the health department's telephone surveys, more than 91% of adults approved of grading, 88% of those who had seen a grade said they considered it when deciding where to eat, and about three-quarters said an A made them more confident in a restaurant's food safety.¹ Disclosure turns an inspection from a transaction between a restaurant and a regulator into information that reaches the restaurant's customers.

Good results have economic value

Diners' reactions are large enough to show up in restaurant finances. A separate study of New York City restaurants under the grading policy found that, after controlling for underlying compliance, restaurants receiving A grades had higher revenues and were less likely to close than restaurants receiving B grades, while C grades brought lower revenues and a higher probability of closure. The same study found the policy's average effect on revenue across the city as a whole was roughly neutral: grades moved money between restaurants more than they changed the total.²

This point is easy to overlook. Public inspection information does not only single out restaurants with problems. It rewards the ones that consistently keep high standards, businesses that spend on training, refrigeration, cleaning, pest control and food handling that customers cannot otherwise see. Visible inspection performance gives diners a way to recognize that work.

Does disclosure keep people from getting sick?

Here the evidence is less certain. A study comparing New York City with the rest of the state found that after letter grades were introduced, reported Salmonella infections in the city fell about 5.3% a year relative to the rest of New York over 2011 to 2015. The authors concluded that posting results at the point of service was associated with the decline.³ A 2024 survey of 140 local health agencies found that those which graded inspections and routinely disclosed the results reported fewer restaurant-associated outbreaks than those which did not.⁴

But association is not causation, and a dispute over Los Angeles shows why caution is warranted. Early research on Los Angeles County's grade cards reported a substantial drop in foodborne-illness hospitalizations after the cards appeared.⁵ A 2019 reexamination in the American Economic Journal: Economic Policy, using more hospital data and newly collected records of reportable illnesses, found that the result did not hold up. Among other problems, the largest Salmonella outbreak in California's history had hit the region shortly before grading began, and illness fell just as much in neighboring counties that never introduced grade cards.⁶ The original authors published a reply maintaining their finding.⁷

So it would be too strong to say that publishing inspection results has been proven to reduce foodborne illness. The accurate statement is that some studies have found declines in illness associated with disclosure programs, and that a direct causal link remains hard to establish.

What this means for Greenwich

There is a further limit on reading this research locally. Greenwich Dining Record is not New York City's grading program. It conducts no inspections, assigns no grades, imposes no fines and decides nothing about whether an establishment passes. The findings come from the Town of Greenwich Department of Health. Our role is narrower: organizing those public records so residents can see an establishment's history, the violations, the follow-up inspections, and how things changed over time. Results observed under a mandatory letter-grade regime will not automatically appear here.

There is good reason, though, to think visibility itself matters. Before New York's letter grades, inspection scores were already published on the city's website, and researchers noted that merely making records technically available had not produced much change. The later program put easily understood information in front of diners.¹ That distinction is the idea behind this site. A public record is not useful because someone could, in principle, request it or find it on a government website. It becomes useful when people can understand it.

The risks of simplifying

More disclosure is not automatically better disclosure. An inspection captures one moment. A violation can be corrected, management can change, equipment can fail and be replaced. A restaurant with a poor inspection several years ago may run very differently today. Conversely, a restaurant that keeps receiving the same significant violation shows a pattern that is hard to see one report at a time. Anyone presenting this information owes readers that context.

That is one reason this site emphasizes inspection history rather than inventing its own grades. A restaurant that has improved should be able to show it in its record. One with consistently clean inspections should get credit for the consistency. And one with repeated violations should have those records presented accurately, without exaggerating what the underlying forms say.

What the evidence reasonably supports

• Publicizing inspection performance appears to influence where people eat.
• Restaurants appear to respond to that visibility by improving compliance.
• Strong inspection performance has economic value, so transparency rewards good operators as well as pressing poor ones to improve.
• Some evidence links disclosure to less foodborne illness, but not strongly enough to claim that disclosure alone causes the reduction.
• Accessibility matters. Records that are technically public but practically invisible change little.

Greenwich already inspects its food establishments, and those inspections already produce public records. This site does not change what inspectors find. It changes how easily the rest of us can see it. If that encourages problems to be fixed, rewards the places that consistently do well, and helps residents decide where to eat, that is a meaningful result in itself.

Sources

1. Wong MR, McKelvey W, Ito K, Schiff C, Jacobson JB, Kass D. Impact of a letter-grade program on restaurant sanitary conditions and diner behavior in New York City. American Journal of Public Health. 2015;105(3):e81–e87. PMC4330857.
2. Rothbart MW, Schwartz AE, Calabrese TD, Papper Z, Mijanovich T, Meltzer R, Silver D. What a difference a grade makes: evidence from New York City's restaurant grading policy. Public Administration Review. 2019. doi:10.1111/puar.13091.
3. Firestone MJ, Hedberg CW. Restaurant inspection letter grades and Salmonella infections, New York, New York, USA. Emerging Infectious Diseases. 2018;24(12):2164–2168. CDC.
4. Kim TN, Edmundson AR, Hedberg CW. Foodborne illness complaint systems detect, and restaurant inspection programs prevent restaurant-associated foodborne illness outbreaks. Foodborne Pathogens and Disease. 2024. PMC10877379.
5. Simon PA, Leslie P, Run G, et al. Impact of restaurant hygiene grade cards on foodborne-disease hospitalizations in Los Angeles County. Journal of Environmental Health. 2005;67(7):32–36. PubMed.
6. Ho DE, Ashwood ZC, Handan-Nader C. New evidence on information disclosure through restaurant hygiene grading. American Economic Journal: Economic Policy. 2019;11(4). doi:10.1257/pol.20180230.
7. Jin GZ, Leslie P. New evidence on information disclosure through restaurant hygiene grading: reply. American Economic Journal: Economic Policy. 2019;11(4). doi:10.1257/pol.20180543.