Pollution Hotline. 888-510-5151. Santa Clara, CA 95050.Discover Santa Clara®. Susan Ellenberg, District 4, President. The Board is not permitted to take action on items that are not on the noticed agenda, but may refer items to staff for future consideration. Many flammable gas sensors are oxygen dependent and will not provide reliable readings in an oxygen deficient atmosphere. Most wells in Santa Clara County produce high-quality water that meets drinking water standards without any treatment. County of Santa Clara logo - santaclara.gif.