Wednesday September 3, 2014

The City of Napa uses several large tanks as part of the water delivery system. One of those is “B Tank” on Montana Drive in Browns Valley. This 1 million-gallon tank suffered extensive damage in the South Napa Quake. With this tank completely off line, water pressure will fluctuate for about 1,800 customers in the Browns Valley and Congress Valley areas. The affected area is generally west of Westview Drive, south of Redwood Road (including Lynn Drive) and north of Old Sonoma Road. (The yellow shaded areas on this map.)

During periods of high water use, lower pressures may be most noticeable for those with homes at higher elevations. This is because water pressure is normally created by gravity flow from the hillside tank, but currently is being created by pumped systems that are not designed for this sole purpose.

Water Division managers are adjusting pressure in the system to provide a temporary solution to this problem, but the City is looking for residents in this affected area to help with the solution by taking these steps:

  • Adjust irrigation systems. If irrigation is not necessary, please turn it off. If irrigation is required, modify your watering times this way: if your street address is an odd number, irrigate between 10pm and 1am. If you street address is an even number, irrigate between 1am and 4am.
  • When possible, reduce water use during high demand hours 5am to 9am and 6pm to 9pm. For example, run laundry and dishwashers outside of peak demand times, and take shorter showers.


It may take up to six months to repair or replace the “B Tank” at an estimated cost of $2.5 million.