The Defense Has Claimed:  The City and County of San Francisco (CCSF) is in full compliance with state noise regulation.
What the law says:
        California noise regulations require airports in the state to use
          CNEL (one way to measure overhead flight noise). 
         "The California Airport Noise Standards states that the basis for the
         acceptable level of aircraft noise for persons living in the vicinity of
         airports is a CNEL of 65 decibels. It's the noise standard that defines
         the airport's noise contour and is recognized by the FAA as the
         federal standard."
         People in Burlingame, Hillsborough, San Mateo, and most of
         Millbrae do not live in the airport's noise contour.
         See noise contour map below.

As an interesting aside, below is what a “CNEL” measurement would look like. Each of these 3 examples shows a noise equivalent of 65 A-weighted decibels, an acceptable level from the airport’s viewpoint.

This has nothing to do with our runway noise runway noise problem.


Source: Informal Hearing Brief of Defendant, 2019, page 10.
If 100 aircraft a day flew to/from SFO, it would satisfy the California Airport Noise Standards that the City and County of San Francisco maintains it complies with.

As of December 31, 2018, airport operations averaged 1287 a day, more than 10 times what is acceptable to the California Airport Noise Standards.
           source provided to us: