The Water Division is responsible for the operation, maintenance, and improvement of the municipal water system serving more than 86,000 people in the City of Napa and adjacent areas.  The Division is dedicated to providing a safe and reliable supply of high-quality drinking water for its residential, commercial, industrial, and institutional customers.  

A comprehensive review of the City's water system is contained in the Urban Water Management Plan.  The Plan describes and evaluates water supply sources, projected demand, water conservation and water shortage contingency programs, and overall water service reliability through 2035.

SPECIAL NOTICE:  The City of Napa Water System is meeting the regulatory standard for Disinfection Byproducts in Drinking Water.  If you have previously received a special notice in the mail regarding the presence of disinfection byproducts, specifically trihalomethanes (THMs), that occur from the reaction of chlorine with organic matter in potable water, the Water Division is pleased to report that the running annual averages for all sites are now in compliance, below the new regulatory threshold of 80 parts per billion (ppb).


sow logo smallThe Governor first declared a Drought State of Emergency in January 2014, encouraging all Californians to take personal actions to reduce water demand.  Napa responded in 2014 and 2015 with its lowest water usage in more than twenty years.  On April 1, 2015, with record low snowpack in the Sierra Nevada mountains, the Governor issued an Executive Order seeking a 25% statewide reduction in urban water use.  Because of previous conservation achieved, the City of Napa is required to reduce its water consumption by 20% for the period of June 2015 through May 2016 (compared to 2013 levels).  Together, we are meeting this goal.  Please visit our Water Conservation section for local water-saving ideas, including generous rebate programs, and get some great tips from the Save Our Water campaign.  The State Water Board has adopted statewide regulations to increase water conservation and the City is enforcing prohibitions on water waste:


REPORT WATER WASTE:  Call 707-257-9521 or This email address is being protected from spambots. You need JavaScript enabled to view it.



Click the following links for details on specific Water Division topics: 

Contact Water Division administrative staff at 707-257-9521.  Our downtown Napa headquarters is located at 1340 Clay Street (Clay & Franklin Streets), and is open weekdays 8am to 5pm.  For after-hours water emergencies, please call 707-253-4451.