Commercial Rates

Commercial properties are charged the sewer service fee based upon actual winter water usage as reported by MMWD for the billing cycle ended in either January or February of the prior year. The calculation utilizes and average gallon per day for residential usage to convert the MMWD usage into EDUs.


  • Larkspur Commercial Sewer Rate: $1,125 per EDU
  • Ross Valley Commercial Rates: $856 per EDU