H26r - Restaurant Over 2,000 Sqft · San Francisco, CA

Mason Diner

320 Mason St

Last inspected Oct 8, 2026 · View Map ↗ · Compare ↗

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Pass

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SteadyThe last two inspections recorded a similar number of violations. Review the dated records below.

Quick Answers

When was Mason Diner last inspected?: The most recent inspection on record was on Oct 8, 2026. The result listed by San Francisco Department of Public Health, Environmental Health was “Pass”.
Were any violations recorded at the last inspection?: Yes: 1 violation recorded. Each one is listed below with the official wording.
How many inspections are on record?: 8 inspections on record, from Aug 6, 2024 to Oct 8, 2026.
Has Mason Diner ever been closed by the health department?: No closure appears in the 8 inspection records we hold for this business. The earliest is dated Aug 6, 2024.

The Full Inspection History

8 inspections

Inspection

Oct 8, 2026

Pass

1 recorded violation

notedCode 114135, 114185.1 114185.3 [d-e]Food temperature

Official Wording

Store wiping cloths used to wipe service counters, scales, or other surfaces that may come into contact with food in clean water with sanitizer or use only once; separate sanitizing containers shall be provided for wiping cloths used with raw animal foods., 114130-114130.5, 114132, 114133, 114137, 114139, 114153, 114163, 114165, 114167, 114169, 114175, 114177, 114180, 114182 - Ensure all equipment is approved, properly installed, clean, and maintained in good repair. Ensure all appliances are NSF-approved, commercial grade, durable, and easily cleanable., 113996, 113998, 114037, 114429, 114429.3, 114429.5 - Keep potentially hazardous foods (PHF) cold at 41°F or below or hot held at 135°F or above. Immediately discontinue storing PHF at room temperature.

In Plain English

Food was not kept cold enough, hot enough, cooled fast enough, or cooked or reheated to the right temperature. Bacteria grow quickly in the "danger zone" between 41°F and 135°F, which makes this one of the most important food-safety checks.

More about food kept at an unsafe temperature

Official record from San Francisco Department of Public Health, Environmental Health, Oct 8, 2026 · Original Source

Inspection

Oct 6, 2026

Pass

1 recorded violation

notedCode 114130-114130.5, 114132, 114133, 114137, 114139, 114153, 114163, 114165, 114167,Chemicals

Official Wording

Ensure all equipment is approved, properly installed, clean, and maintained in good repair. Ensure all appliances are NSF-approved, commercial grade, durable, and easily cleanable., 113967, 113976, 113980, 113988, 113990, 114035, 114254.3, 113975 - Discard all contaminated/adulterated food immediately if it bears or contains any poisonous or deleterious substance that may render it impure or injurious to health., 114123, 114197, 114328(o) - Eliminate sewage backflow into the facility. Clean and sanitize all areas contaminated with sewage with a bleach solution (1 cup bleach per 9 cups water).Hire a licensed plumbing contractor if necessary. All contaminated food items must be discarded. All items that cannot be properly sanitized must be discarded., 113996, 113998, 114037, 114429, 114429.3, 114429.5 - Keep potentially hazardous foods (PHF) cold at 41°F or below or hot held at 135°F or above. Immediately discontinue storing PHF at room temperature., 114135, 114185.1 114185.3 [d-e] - Store wiping cloths used to wipe service counters, scales, or other surfaces that may come into contact with food in clean water with sanitizer or use only once; separate sanitizing containers shall be provided for wiping cloths used with raw animal foods.

In Plain English

Cleaning products, pesticides, or other chemicals were stored or labeled in a way that could let them get into food. This is serious because chemical contamination can make people sick quickly.

More about chemicals stored or used unsafely

Official record from San Francisco Department of Public Health, Environmental Health, Oct 6, 2026 · Original Source

Reinspection

Apr 11, 2025

Pass

1 recorded violation

notedCode 114130-114130.5, 114132, 114133, 114137, 114139, 114153, 114163, 114165, 114167,Cleaning and sanitizing

Official Wording

Ensure all equipment is approved, properly installed, clean, and maintained in good repair. Ensure all appliances are NSF-approved, commercial grade, durable, and easily cleanable.

In Plain English

Dishes, equipment, or surfaces that touch food were not properly washed, rinsed, and sanitized, or sanitizer was not at the right strength. Clean surfaces help stop germs from spreading to food.

More about cleaning or sanitizing problems

Official record from San Francisco Department of Public Health, Environmental Health, Apr 11, 2025 · Original Source

Routine

Mar 19, 2025

Pass

1 recorded violation

notedCode 114130-114130.5, 114132, 114133, 114137, 114139, 114153, 114163, 114165, 114167,Pests

Official Wording

Ensure all equipment is approved, properly installed, clean, and maintained in good repair. Ensure all appliances are NSF-approved, commercial grade, durable, and easily cleanable., 114067(h), 114123, 114143(a, b), 114256-114256.2, 114256.4, 114257-114257.1, 114259, 114259.2-114259.3, 114279, 114281, 114282 - Keep clean and free of litter or rubbish the premises of each food facility; non-food items shall be stored and displayed separate from food and food-contact surfaces; the facility shall be kept vermin proof; open-air barbecues shall be operated in an approved manner., 113969, 113971 - Ensure all food employees are utilizing appropriate hair restraints when handling food., 114259, 114259.1, 114259.4, 114259.5 - Eliminate the infestation/activity of cockroaches/rodents/flies/vermin from the food facility by using only approved methods. Remove all evidence of the infestation and thoroughly clean and sanitize all affected surfaces. Construct, equip, maintain and operate the food facility so as to prevent the entrance and harborage of animals, birds and vermin including, but not limited to, rodents and insects., 113984(d), 114097, 114099.1, 114099.4, 114099.6, 114101(b, c, d), 114105, 114109, 114111, 114113, 11415 (a, b, D), 114117, 114125(b), 114141 - Properly wash, rinse and sanitize all food contact surfaces. Make a 100 ppm bleach sanitizing solution or a 200 ppm quaternary ammonia solution for the third compartment., 113996, 113998, 114037, 114429, 114429.3, 114429.5 - Keep potentially hazardous foods (PHF) cold at 41°F or below or hot held at 135°F or above. Immediately discontinue storing PHF at room temperature.

In Plain English

The inspector found mice, rats, cockroaches, flies, or evidence of them (like droppings) inside the business, or conditions that could attract them. Pests can spread bacteria to food and surfaces, so this is treated as one of the more serious findings.

More about signs of rodents or insects

Official record from San Francisco Department of Public Health, Environmental Health, Mar 19, 2025 · Original Source

Reinspection

Aug 30, 2024

Pass

0 recorded violations

No violations recorded in this inspection.

Official record from San Francisco Department of Public Health, Environmental Health, Aug 30, 2024 · Original Source

Reinspection

Aug 22, 2024

Pass

1 recorded violation

notedCode 113996, 113998, 114037, 114429, 114429.3, 114429.5Food temperature

Official Wording

In Plain English

More about food kept at an unsafe temperature

Official record from San Francisco Department of Public Health, Environmental Health, Aug 22, 2024 · Original Source

Reinspection

Aug 13, 2024

Pass

1 recorded violation

notedCode 114171, 114189.1, 114190, 114192, 114193, 114193.1, 114199, 114201, 114269Food temperature

Official Wording

Protect the potable water supply with a backflow protection device, as required by applicable plumbing codes. All plumbing, plumbing fixtures, and grease interceptors shall be installed in compliance with local plumbing ordinances, shall be maintained so as to prevent any contamination, and shall be kept clean, fully operative, and in good repair. Any hose used for conveying potable water shall be of approved materials, labeled, properly stored, and used for no other purpose., 113947.1-113947.6, 113948 - Obtain a state approved food safety certification course within 60 days of operation or when a Food Safety Manager has left the facility. Maintain copies of food safety certificates (food safety manager and food handler cards) on site., 113996, 113998, 114037, 114429, 114429.3, 114429.5 - Keep potentially hazardous foods (PHF) cold at 41°F or below or hot held at 135°F or above. Immediately discontinue storing PHF at room temperature.

In Plain English

More about food kept at an unsafe temperature

Official record from San Francisco Department of Public Health, Environmental Health, Aug 13, 2024 · Original Source

Routine

Aug 6, 2024

Pass

1 recorded violation

notedCode 113996, 113998, 114037, 114429, 114429.3, 114429.5Food temperature

Official Wording

Keep potentially hazardous foods (PHF) cold at 41°F or below or hot held at 135°F or above. Immediately discontinue storing PHF at room temperature., 113947.1-113947.6, 113948 - Obtain a state approved food safety certification course within 60 days of operation or when a Food Safety Manager has left the facility. Maintain copies of food safety certificates (food safety manager and food handler cards) on site., 114171, 114189.1, 114190, 114192, 114193, 114193.1, 114199, 114201, 114269 - Protect the potable water supply with a backflow protection device, as required by applicable plumbing codes. All plumbing, plumbing fixtures, and grease interceptors shall be installed in compliance with local plumbing ordinances, shall be maintained so as to prevent any contamination, and shall be kept clean, fully operative, and in good repair. Any hose used for conveying potable water shall be of approved materials, labeled, properly stored, and used for no other purpose.