Foothills water customers are being asked to tighten taps further and refrain from watering lawns for up to 10 days starting Feb. 29, while Metropolitan Water District of Southern California temporarily closes a La Verne treatment plant for infrastructure upgrades.
MWD is in the process of switching its Weymouth Filtration plant from a chloramine-based treatment method to ozonation, in which ozone injected into raw water creates bubbles that carry away pathogens and contaminants, spokesman Bob Muir said in an interview Friday.