CORONAVIRUS (COVID-19) SAFETY: Your drinking water is safe and reliable. The health and safety of our customers and employees are top priority. We are here to serve you, and in an effort to reduce the risk of contracting and/or transmitting the coronavirus (COVID-19, MWD is asking customers to use our many online and telephone options rather than doing business in person.  Read more...

Doulton Tunnel

Doulton Tunnel
Doulton Tunnel

In 1921, the year the District was founded, construction began on the Doulton Tunnel-Juncal Dam-Jameson Lake project. The tunnel was holed through in April 1928, and continues to be a vital source of water for the District.

Doulton Tunnel

Doulton Tunnel is a 2.2-mile long tunnel that conveys surface water from Jameson Lake through the Santa Ynez Mountains to the District's Bella Vista treatment plant.

Groundwater infiltration through Doulton Tunnel is a distinct and important source of water supply for the District. During consecutive years of normal rainfall, groundwater infiltration through the tunnel produces approximately 300 to 350 acre feet per year. This groundwater is commingled with surface water being conveyed from Jameson Lake, but is considered as a separate source; when no water is being delivered from Jameson Lake groundwater infiltration continues to flow through the tunnel. In fact, the water needs of the district were entirely supplied from Doulton tunnel between 1924 and 1927, before it was holed through to meet the reservoir.