According to the Center for Science in the Public Interest (CSPI), if you live in Austin TX or Boston MA you might want to think twice before going out to eat.

CSPI has ranked 20 US cities from best to worst using criteria from the city's food inspectors. The ranking considers "how often city inspectors found five major health hazards and five less critical concerns in 30 high-end, medium-range, and fast-food eateries in each city." Hand washing, maintaining food at a proper temperature, and improper cooking are some of the major health hazards. Minor infractions include poor employee cleanliness and hygiene, rodent and/or insect infestation, presence of sick restaurant workers, and contact of bare hands with food.

The CSPI encourages cities to adopt a restaurant grading program similar to a program in LA County where restaurants have to post what health inspection grade they received -- A, B, or C. (Lower grades would result in temporary or permanent closure).

Keep reading to see the CSPI's "Dirty Dining" list from worst to best.

• Austin, Texas. 58 violations in 30 restaurants.
• Boston, Massachusetts. 63 violations in 30 restaurants.
• Milwaukee, Wisconsin. 27 violations in 20 restaurants.
• Colorado Springs, Colorado. 46 violations in 30 restaurants.
• Kansas City, Missouri. 41 violations in 30 restaurants.
• Pittsburgh, Pennsylvania. 40 violations in 30 restaurants.
• Denver, Colorado. 35 violations in 30 restaurants.
• Las Vegas, Nevada. 30 violations in 25 restaurants.
• Washington, DC. 27 violations in 25 restaurants.
  
• New York, New York. 32 violations in 30 restaurants.
• Atlanta, Georgia. 19 violations in 20 restaurants.
• Portland, Oregon. 25 violations in 27 restaurants.
• Baltimore, Maryland. 14 violations in 14 restaurants.
• Minneapolis, Minnesota. 31 violations in 29 restaurants.
• Chicago, Illinois. 22 violations in 30 restaurants.
• St. Louis, Missouri. 17 violations in 27 restaurants.
• Seattle, Washington. 16 violations in 30 restaurants.
• Philadelphia, Pennsylvania. 16 violations in 23 restaurants.
• San Francisco, California. 15 violations in 30 restaurants.
• Tucson, Arizona. 14 violations in 29 restaurants.

CSPI ranked the cities by assigning a weighted score depending on the severity of each violation it found.