Yes, CA law states that SoCalGas has to account for the leak by cutting emissions in other places. I think even before the government mandate SoCalGas said they will do compensate for the leak by cutting back in other emissions. So the net effect should be zero after some years.
In my past job I was building online banking for a small Los Angeles based bank. I'm pretty sure they offer the service you seek. The online banking service I was helping build is still in beta but I think you can request to be added to the beta. Try City National Bank (cnb.com).